Views: 23 Author: Wang Publish Time: 2025-09-01 Origin: Site
Where do you buy 316 stainless steel sheet? You buy it from four channels, and the right one depends on quantity and urgency. Mill-direct producers such as JN Alloy give the lowest price per pound for orders above roughly 500 lb of a single size, with full EN 10204 3.1 certification and three to eight week lead times. Service centers such as Ryerson and Reliance Steel hold stock and cut it to length for shipment the same week. Local metal stores and online retailers such as McMaster-Carr and OnlineMetals sell single sheets with no minimum at the highest price per pound. Specialty finishers add perforating, mirror polishing and PVD colour.
316 stainless steel sheet is an austenitic grade - UNS S31600, EN 1.4401, JIS SUS316 - that contains 2.00-3.00% molybdenum. That molybdenum is the reason it costs roughly 20-40% more than 304 and the reason it resists the chloride pitting that ruins 304 in coastal, marine, chemical and food-plant service. If no chloride is present anywhere in the environment, 304 does the same job for less money.
TL;DR - where to buy 316 stainless steel sheet
Over ~500 lb of one size: buy mill-direct from JN Alloy - lowest cost per pound, custom gauge and finish, EN 10204 3.1, 3-8 week lead time.
Under ~500 lb, needed this week: buy from a service center or distributor - stocked gauges, cut-to-length, higher cost per pound.
One or two sheets: buy from a local metal supermarket or online retailer - no minimum, fast, highest cost per pound.
Specify 316L, not 316, for anything welded - the 0.03% carbon cap removes sensitisation risk.
Always require an EN 10204 3.1 mill test report and check the actual molybdenum result falls between 2.00% and 3.00%.
Quick reference - 316 stainless steel sheet at a glance
| Attribute | Value |
|---|---|
| UNS / EN / JIS / GB | S31600 / 1.4401 / SUS316 / 06Cr17Ni12Mo2 (S31608) |
| Composition | 16.0-18.0% Cr, 10.0-14.0% Ni, 2.00-3.00% Mo, 0.08% C max |
| Governing specification | ASTM A240/A240M, with ASTM A480/A480M tolerances |
| Tensile / yield (A240 minimum) | 515 MPa (75 ksi) / 205 MPa (30 ksi), 40% elongation |
| Density | 7.98 g/cm3 (0.288 lb/in3) |
| PREN (approx.) | 24-26, versus roughly 19 for 304 |
| Stocked gauge range | 30 ga (0.0125 in) to 7 ga (0.1793 in); 3/16 in and above is plate |
| Common finishes | 2B, BA, No. 3, No. 4 brushed, No. 8 mirror, PVD colour |
| Indicative price | $4.50-$7.00/lb for 2B; $8.00-$12.00+/lb for No. 8 mirror |
| Documentation to require | EN 10204 3.1 minimum (3.2 for critical service) |
Choose 316 sheet when chlorides are present anywhere in the service environment. Its 2-3% molybdenum raises the pitting resistance equivalent number from roughly 19 (304) to roughly 25, and that margin is what keeps coastal, marine and chemical equipment from pitting.
Corrosion resistance. The 2-3% molybdenum addition is the whole argument for 316. Chlorides turn up in coastal atmospheres, de-icing salt, chemical process streams, food plant washdowns, and pharmaceutical cleaning cycles. In every one of those environments, molybdenum helps the passive film re-form after local breakdown instead of letting a pit propagate. The practical measure is the pitting resistance equivalent number, PREN = %Cr + 3.3 x %Mo + 16 x %N, which puts 316 in the 24-26 band against roughly 19 for 304.
Strength and temperature capability. Annealed 316 sheet carries a minimum tensile strength of 515 MPa (75 ksi) and a minimum yield strength of 205 MPa (30 ksi) under ASTM A240/A240M. It retains useful strength at elevated temperature, which is why it appears in heat exchangers, exhaust ducting and process vessels, and it stays tough at cryogenic temperature, which is why it is used in LNG and cold-service work.
Hygiene and surface integrity. In food, pharmaceutical and biotech service, preventing bacterial harbourage matters as much as corrosion resistance. 316 sheet is supplied in smooth mill finishes such as 2B and bright annealed, and polished finishes such as No. 4 brushed and No. 8 mirror, all of which clean and sterilise readily and support regulatory compliance.
Fabrication. 316 sheet forms, welds and machines well. It draws and bends with generous minimum bend radii, welds with ER316L filler under standard shop procedures, and accepts laser, plasma, waterjet and shear cutting. That combination is why it is specified for both one-off architectural panels and production process equipment.
Lifecycle cost. 316 costs roughly 20-40% more than 304 per pound at the mill, but it lasts substantially longer in a corrosive atmosphere and needs far less cleaning and polishing. Over a 20-year cladding or vessel lifecycle, that usually means 316 is the cheaper choice even though it is the more expensive purchase.
Where 316 sheet pays for itself - application and environment fit
| Environment | Chloride exposure | Recommended grade | Why |
|---|---|---|---|
| Coastal architectural cladding | Moderate - airborne salt | 316 / 316L | 304 shows tea-staining within a few km of the coast; 316 does not. |
| Marine hardware and deck fittings | High - splash and spray | 316 / 316L | Molybdenum resists pitting in wet-dry cycling. |
| Chemical process tanks and ducting | Variable, often aggressive | 316L | Low carbon avoids sensitisation in welded vessels. |
| Food and beverage plant | Moderate - sanitiser chlorides | 316L, No. 4 finish | Smooth cleanable surface plus chloride tolerance. |
| Pharmaceutical and biotech | Low to moderate, high purity | 316L, 2B or electropolished | Supports ASME BPE surface requirements. |
| Dry interior joinery and trim | None | 304 | No chloride load, so the molybdenum premium buys nothing. |
| Permanently immersed seawater | Very high | Duplex 2205 or 6% Mo grade | 316 is marginal in creviced immersion; step up in alloy. |
316 sheet is sold in four product types - plain mill-finish, perforated, polished and PVD colour-coated - plus the low-carbon 316L, high-carbon 316H and titanium-stabilised 316Ti variants of the base alloy.
Plain 316 sheet is the standard mill product: cold rolled, annealed and pickled to a 2B finish with a uniform, lightly reflective matte grey appearance. It is the cheapest form per pound and the base material for almost all fabrication, and it is what you should specify unless appearance or function demands otherwise.
Perforated 316 sheet is made by punching or laser-cutting a hole pattern - round, square, slotted or custom - into plain sheet to a specified open area and pitch. The metallurgical requirement that buyers often miss is clean, deburred hole edges; a torn or burned edge gives corrosion a place to start. Perforated 316 is used for filtration, screening, separation, acoustic panels, drainage walkways and ventilated facades.
Polished 316 sheet is produced by progressive mechanical polishing to a target surface roughness and appearance: No. 3 and No. 4 brushed for architectural and equipment surfaces, No. 6 and No. 7 intermediate satin, and No. 8 mirror for decorative feature panels. Polishing removes the micro-scale irregularities where contaminants lodge, so a finer finish is also a more corrosion-resistant finish - provided the polishing sequence does not overheat the surface or embed foreign particles.
Colour-coated 316 sheet carries a thin ceramic or metal layer applied by physical vapour deposition (PVD) over a polished substrate, less often by controlled thermal oxidation. The PVD layer is chemically inert, UV-stable and hard, and it does not change the sheet's mechanical properties. It does add a wear-resistance benefit, but damage that exposes the base metal can create a local corrosion cell, so careful handling and installation matter more than with plain sheet.
316 / UNS S31600 - the standard grade, 0.08% carbon maximum, EN 1.4401.
316L / UNS S31603 - 0.03% carbon maximum, EN 1.4404, the default for welded fabrication. See what 316L stainless steel is.
316H / UNS S31609 - 0.04-0.10% carbon for elevated-temperature strength and higher allowable stress.
316Ti / UNS S31635 - titanium stabilised, EN 1.4571, for service in the sensitising range. See 316Ti stainless steel.
316LN / UNS S31653 - nitrogen strengthened low-carbon grade for higher strength.
316 sheet chemistry is bounded at 16.0-18.0% chromium, 10.0-14.0% nickel and 2.00-3.00% molybdenum, with carbon capped at 0.08% (0.03% for 316L). Molybdenum is the element that separates 316 from 304 and the one to verify on every mill certificate.
Chemical composition of 316 and 316L stainless steel, weight percent
| Element | 316 / S31600 | 316L / S31603 | Role in the alloy |
|---|---|---|---|
| Carbon (C) | 0.08 max | 0.03 max | Lower carbon in 316L prevents weld sensitisation. |
| Manganese (Mn) | 2.00 max | 2.00 max | Deoxidiser, partially substitutes for nickel. |
| Silicon (Si) | 0.75 max (A240) | 0.75 max (A240) | Deoxidiser; higher limits apply to some product specs. |
| Phosphorus (P) | 0.045 max | 0.045 max | Residual, kept low for toughness. |
| Sulfur (S) | 0.030 max | 0.030 max | Residual; affects hot workability and weldability. |
| Chromium (Cr) | 16.0-18.0 | 16.0-18.0 | Forms the passive oxide film. |
| Nickel (Ni) | 10.0-14.0 | 10.0-14.0 | Stabilises the austenitic structure. |
| Molybdenum (Mo) | 2.00-3.00 | 2.00-3.00 | The pitting and crevice corrosion resistor. |
| Nitrogen (N) | 0.10 max | 0.10 max | Strengthens and adds to the PREN value. |
| Iron (Fe) | Balance | Balance | Base element. |
Buying note: when you review a mill test report, check the actual molybdenum result, not just the grade name. A result below 2.00% means the heat does not meet the 316 minimum, whatever the paperwork header says.
Annealed 316 sheet delivers a minimum tensile strength of 515 MPa (75 ksi) and minimum yield of 205 MPa (30 ksi) under ASTM A240/A240M, with 40% minimum elongation, a density of 7.98 g/cm3 and a melting range of 1375-1450 degrees C.
Physical properties of 316 stainless steel (typical, room temperature unless noted)
| Property | Value | Why it matters when buying |
|---|---|---|
| Density | 7.98 g/cm3 (0.288 lb/in3) | Converts gauge thickness to shipped weight and freight cost. |
| Melting range | 1375-1450 degrees C (2500-2640 degrees F) | Sets hot-forming and heat-treat limits. |
| Solution annealing | 1010-1150 degrees C, then rapid cool | The condition mill sheet is supplied in. |
| Crystal structure | Austenitic (face-centred cubic) | Non-magnetic when annealed, tough at cryogenic temperature. |
| Electrical resistivity | 73 microohm-cm | Relevant for busbar and resistance heating elements. |
| Specific heat | 0.45 J/g.K | Used in heat exchanger and vessel thermal calculations. |
| Thermal conductivity | 16.3 W/m.K at 100 degrees C | Lower than carbon steel; affects welding heat input. |
| Thermal expansion | 15.9 micrometre/m.degrees C (0-100 degrees C) | Drives expansion joint design in cladding. |
| Elastic modulus | 193 GPa (28 x 10^6 psi) | Used for deflection and springback calculations. |
| Magnetic permeability | Non-magnetic, close to 1.02 | May show weak pull after cold forming - that is normal. |
Mechanical properties - published mill data versus ASTM A240/A240M minimums
| Property | Published mill data | ASTM A240/A240M minimum - 316 | ASTM A240/A240M minimum - 316L |
|---|---|---|---|
| Tensile strength | 520 MPa or greater | 515 MPa (75 ksi) | 485 MPa (70 ksi) |
| Yield strength | 205 MPa or greater | 205 MPa (30 ksi) | 170 MPa (25 ksi) |
| Elongation in 2 in | 40% or greater | 40% | 40% |
| Reduction of area | 60% or greater | Not specified | Not specified |
| Hardness | 187 HB / 90 HRB / 200 HV max | 217 HBW / 95 HRB max | 217 HBW / 95 HRB max |
Data note: the published mill figures in the second column follow JIS G4304 and GB/T 4237 practice. The ASTM A240/A240M column is the contractual minimum for material certified to the ASTM specification, and it is the column a US or ASME code job must be checked against.
For flat-rolled product the governing specifications are ASTM A240/A240M for the material and ASTM A480/A480M for general requirements and tolerances. ASME SA-240 applies to pressure vessel work, EN 10088-2 to European projects, and JIS G4304/G4305 and GB/T 4237 to Japanese and Chinese product.
The table below reproduces the published cross-reference of how the 316 chemistry is defined across the wider ASTM, JIS and GB family. Read it as a chemistry map rather than a sheet specification: several of the listed standards cover bar, forging, pipe and tube rather than flat-rolled product, and they are included because the UNS S31600 chemistry limits are defined identically across them.
NO. | Standard | Grade | Serial Number | C | Mn | P | S | Si | Cr | Ni | N | Mo |
1 | ASTM A276/A276M | 316 | S31600 | 0.08 | 2 | 0.045 | 0.03 | 1 | 16.0-18.0 | 10.0-14.0 | - | 2.0-3.0 |
2 | ASTM A959 | 316 | S31600 | 0.08 | 2 | 0.045 | 0.03 | 1 | 16.0-18.0 | 10.0-14.0 | - | 2.0-3.0 |
3 | ASTM A240/A240M | 316 | S31600 | 0.08 | 2 | 0.045 | 0.03 | 0.75 | 16.0-18.0 | 10.0-14.0 | 0.1 | 2.0-3.0 |
4 | ASTM A182/A182M | F316 | S31600 | 0.08 | 2 | 0.045 | 0.03 | 1 | 16.0-18.0 | 10.0-14.0 | 0.1 | 2.0-3.0 |
5 | ASTM A193/A193M | 316 | S31600 | 0.08 | 2 | 0.045 | 0.03 | 1 | 16.0-18.0 | 10.0-14.0 | - | 2.0-3.0 |
6 | ASTM A269/A269M | TP316 | S31600 | 0.08 | 2 | 0.045 | 0.03 | 1 | 16.0-18.0 | 10.0-14.0 | - | 2.0-3.0 |
7 | ASTM A312/A312M | TP316 | S31600 | 0.08 | 2 | 0.045 | 0.03 | 1 | 16.0-18.0 | 10.0-14.0 | - | 2.0-3.0 |
8 | ASTM A320/A320M | 316 | S31600 | 0.08 | 2 | 0.045 | 0.03 | 1 | 16.0-18.0 | 10.0-14.0 | - | 2.0-3.0 |
9 | ASTM A403/A403M | WP316 CR316 | S31600 | 0.08 | 2 | 0.045 | 0.03 | 1 | 16.0-18.0 | 10.0-14.0 | - | 2.0-3.0 |
10 | ASTM A493 | 316 | S31600 | 0.08 | 2 | 0.045 | 0.03 | 1 | 16.0-18.0 | 10.0-14.0 | 0.1 | 2.0-3.0 |
11 | ASTM A554 | MT-316 | 0.08 | 2 | 0.045 | 0.03 | 1 | 16.0-18.0 | 10.0-14.0 | - | 2.0-3.0 | |
12 | JIS G4303:2012 | SUS316 | 0.08 | 2 | 0.045 | 0.03 | 1 | 16.0-18.0 | 10.0-14.0 | - | 2.0-3.0 | |
13 | JIS G4304:2012 | SUS316 | 0.08 | 2 | 0.045 | 0.03 | 1 | 16.0-18.0 | 10.0-14.0 | - | 2.0-3.0 | |
14 | JIS G4305:2012 | SUS316 | 0.08 | 2 | 0.045 | 0.03 | 1 | 16.0-18.0 | 10.0-14.0 | - | 2.0-3.0 | |
15 | GB/T 20878-2007 | 06Cr17Ni12Mo2 | S31608 | 0.08 | 2 | 0.045 | 0.03 | 1 | 16.0-18.0 | 10.0-14.0 | - | 2.0-3.0 |
Specifications to name on a 316 sheet purchase order
| Specification | Scope | When to specify it |
|---|---|---|
| ASTM A240/A240M | Chromium and chromium-nickel stainless plate, sheet and strip | Always - this is the material specification. |
| ASTM A480/A480M | General requirements for flat-rolled stainless and heat-resisting steel | Always - covers thickness, width and flatness tolerances. |
| ASTM A666 | Annealed or cold-worked austenitic stainless sheet, strip, plate and flat bar | Architectural and structural cold-worked product. |
| ASME SA-240 | ASME boiler and pressure vessel adoption of A240 | Pressure vessels and coded equipment. |
| EN 10088-2 | Stainless sheet and plate for general purposes | European projects; grades 1.4401 (316) and 1.4404 (316L). |
| JIS G4304 / G4305 | Hot-rolled and cold-rolled stainless plate, sheet and strip | Japanese-sourced product, grade SUS316. |
| ASTM A380 / A967 | Cleaning and descaling; chemical passivation treatments | Any hygienic or corrosion-critical fabrication. |
316 sheet is stocked from 30 gauge (0.0125 in / 0.32 mm) to 7 gauge (0.1793 in / 4.55 mm) on the Brown and Sharpe system; anything at 3/16 in (4.76 mm) and above is classified and priced as plate. Mill-direct orders can be produced to any gauge in the range rather than only what a distributor stocks.
The chart below is the industry-standard Brown and Sharpe gauge conversion with approximate weights, reproduced unchanged from the published version. Use it to convert a drawing callout into a mill-orderable thickness, and to estimate shipped weight for freight. Note that gauges from 6 ga upward exceed the 3/16 in sheet-plate boundary, so those sizes are ordered as stainless steel plate.
Gauge (B&S) | Decimal Inch (in) | Millimeter (mm) | Approx. Weight (lb/ft²) | Approx. Weight (kg/m²) |
30 ga | 0.0125 | 0.32 | 0.51 | 2.49 |
28 ga | 0.0156 | 0.40 | 0.64 | 3.12 |
26 ga | 0.0187 | 0.47 | 0.76 | 3.71 |
24 ga | 0.0239 | 0.61 | 0.97 | 4.74 |
22 ga | 0.0299 | 0.76 | 1.22 | 5.96 |
20 ga | 0.0359 | 0.91 | 1.46 | 7.13 |
18 ga | 0.0478 | 1.21 | 1.95 | 9.52 |
16 ga | 0.0598 | 1.52 | 2.44 | 11.91 |
14 ga | 0.0747 | 1.90 | 3.05 | 14.89 |
13 ga | 0.0897 | 2.28 | 3.66 | 17.87 |
12 ga | 0.1046 | 2.66 | 4.27 | 20.85 |
11 ga | 0.1196 | 3.04 | 4.88 | 23.83 |
10 ga | 0.1345 | 3.42 | 5.49 | 26.81 |
9 ga | 0.1495 | 3.80 | 6.10 | 29.79 |
8 ga | 0.1644 | 4.18 | 6.71 | 32.77 |
0.1793 | 4.55 | 7.32 | 35.75 | |
6 ga | 0.1943 | 4.94 | 7.93 | 38.73 |
5 ga | 0.2092 | 5.31 | 8.54 | 41.71 |
4 ga | 0.2242 | 5.69 | 9.15 | 44.69 |
3 ga | 0.2391 | 6.07 | 9.76 | 47.67 |
Data note on the weight columns: the published figures are consistent with a density of 7.85 g/cm3, which is the carbon-steel value. 316 has a density of 7.98 g/cm3, so multiply the listed weight by about 1.017 to get the true mass of 316 sheet - roughly 7 kg per tonne of order. The thickness and millimetre columns are correct as published.
For a deeper treatment of gauge selection, see how to choose stainless steel plate thickness and what 7 gauge steel thickness means.
Plan on roughly $4.50-$7.00 per pound for plain 2B 316 sheet, $5.50-$8.00 for No. 4 brushed and $8.00-$12.00+ for No. 8 mirror, with 316L adding $0.20-$0.50 per pound. The nickel and molybdenum surcharge is the single biggest driver and it moves daily.
316 sheet pricing is not a fixed list - it is a base price plus a monthly alloy surcharge, and the surcharge can be a third to a half of the total. Understanding the drivers lets you time a purchase and compare like-for-like quotations:
Alloy surcharges. Nickel and molybdenum prices are set on the London Metal Exchange and move daily. Because 316 carries both a high nickel content and 2-3% molybdenum - which 304 does not - 316 tracks molybdenum volatility directly. This is the largest single component of the price.
Thickness. Thicker sheet uses more metal per square foot, so cost scales with gauge. Very wide or non-standard widths carry a premium because they constrain mill scheduling.
Finish. 2B is the least expensive. Each additional polishing step adds cost, and No. 8 mirror can cost roughly double the 2B price for the same gauge because of the number of abrasive passes and the rejection rate on surface defects.
Order quantity. Mills price per pound on a sliding scale. A one-tonne line item is materially cheaper per pound than a 200 lb line item of the same size, and freight is amortised over far more pounds.
Fabrication and packaging. Perforating, PVD colour, cut-to-length, PVC or laser film protection and export crating are all separately priced.
Freight and duty. Heavy sheet is expensive to move, and import duty and anti-dumping measures vary by destination and country of melt.
Indicative 316 stainless steel sheet price ranges by type
| Type | Thickness | Finish | Indicative price (USD/lb) |
|---|---|---|---|
| Plain 316 | 16 ga (0.0598 in) | 2B matte | $4.50 - $6.00 |
| Plain 316 | 1/8 in (0.125 in) | 2B matte | $4.75 - $6.25 |
| Polished 316 | 16 ga (0.0598 in) | No. 4 brushed | $5.50 - $7.50 |
| Polished 316 | 1/8 in (0.125 in) | No. 8 mirror | $8.00 - $12.00+ |
| Perforated 316 | 16 ga (0.0598 in) | 2B, pre-perforation | $6.00 - $9.00+ |
| 316L low carbon | Any thickness | Any finish | add $0.20 - $0.50/lb |
Data note: the ranges above are the publisher's reference figures for late 2023 to early 2024 and are shown to illustrate the relative spread between finishes, not as a current price. Nickel and molybdenum surcharges have moved since. Always request a dated quotation - see JN Alloy contact.
There are four buying channels. Mill-direct is cheapest per pound above roughly 500 lb of one size, service centers win on speed and cut-to-length for mid-size orders, local metal stores and online retailers win on zero minimum for single sheets, and specialty finishers handle PVD colour, perforating and mirror polish.
Comparison of 316 stainless steel sheet buying channels
| Channel | Best for | Typical minimum | Lead time | Price level | Trade-off |
|---|---|---|---|---|---|
| Mill-direct producer (JN Alloy, Zhengzhou Huitong) | 500 lb and up of one size; custom gauge, width or finish | 1-5 tonnes per size | 3-8 weeks standard, 8-14 weeks custom | Lowest per pound | Longest wait and highest inventory commitment. |
| Full-line service center (Ryerson, Reliance Steel) | Stocked gauges, cut-to-length, repeat call-offs | None to one bundle | Same week, often same day | Moderate premium | Stocked sizes only; limited finish range. |
| Local metal supermarket (Metal Supermarkets, Industrial Metal Supply) | One or two sheets, will call, immediate need | None | Same day to 2 days | High per pound | Highest unit cost; MTR availability varies by branch. |
| Online retailer (McMaster-Carr, OnlineMetals) | Small cut pieces, prototyping, maintenance | None | 1-3 days | High per piece | Convenient and documented, but expensive by weight. |
| Specialty finisher (perforating, PVD colour, No. 8 mirror) | Non-standard surface or hole pattern | Project dependent | Adds 2-6 weeks | Premium | Longest lead time; handle finished surfaces carefully. |
If you need hundreds or thousands of pounds, buy directly from the mill. Mills and their export arms sell stainless steel sheet and plate in coil, sheet and plate form, issue full EN 10204 3.1 documentation with heat-number traceability, and will produce a gauge, width or finish that no distributor stocks. Prices are lowest per pound, but you commit to a mill quantity and a mill lead time.
Full-line distributors hold inventory and sell it cut to your exact size. You pay more per pound than mill-direct, but you get material this week rather than next month, you avoid tying up cash in a full mill lot, and you can order a mixed gauge and finish package in a single shipment.
For one sheet or a handful of small pieces, a local metal store or an online retailer is the practical answer. They cut to size, ship quickly, and sell with no minimum. The price per piece is the highest of any channel, and you should always ask whether an MTR is available before you place the order - some small-lot resellers ship without traceability paperwork.
Special finishes - No. 8 mirror, No. 4 brushed to a specified grit, PVD colour, or perforated patterns - come from finishers rather than general stockists. Expect a lead time premium of two to six weeks on top of the base material, and specify protective film on every polished surface.
JN Alloy supplies 316 and 316L sheet mill-direct with full certification. See the 316 stainless steel product page or request a quotation.
316L is the default for welded fabrication, 316 for higher-temperature strength, 304 for dry interiors where no chloride is present, and 317L when even 316 pits. The decision is driven by chloride load and whether the part will be welded.
Grade comparison for stainless sheet selection
| Grade | UNS / EN | Carbon | Molybdenum | PREN (approx.) | Choose it when |
|---|---|---|---|---|---|
| 304 | S30400 / 1.4301 | 0.08 max | None | 18-20 | Dry interior, no chlorides, lowest cost. |
| 316 | S31600 / 1.4401 | 0.08 max | 2.00-3.00% | 24-26 | Chlorides present and higher-temperature strength needed. |
| 316L | S31603 / 1.4404 | 0.03 max | 2.00-3.00% | 24-26 | Welded fabrication - the default choice for vessels and tanks. |
| 316Ti | S31635 / 1.4571 | 0.08 max | 2.00-3.00% | 24-26 | Sustained service in the sensitising range with no post-weld anneal. |
| 317L | S31703 / 1.4438 | 0.03 max | 3.00-4.00% | 29-32 | 316 is marginal - stronger acids, higher chloride concentration. |
| Duplex 2205 | S32205 / 1.4462 | 0.03 max | 3.00-3.50% | 34-36 | Immersion service or where you want to halve the thickness. |
For a full side-by-side including mechanical data, see 304 vs 316 stainless steel: properties and applications and the 316 material guide. If your chloride load is high enough that 316 is marginal, step up to 317L or 904L super austenitic rather than simply increasing the thickness.
Specify 2B for anything that will be welded or hidden, No. 4 brushed for visible architectural and equipment surfaces, and No. 8 mirror only for decorative panels - mirror roughly doubles the material cost and shows every scratch.
Standard 316 stainless steel sheet finishes
| Finish | How it is made | Typical Ra | Cost level | Typical use |
|---|---|---|---|---|
| No. 1 | Hot rolled, annealed, pickled | 1.5-3.0 micrometre | Lowest | Heavy plate for further processing or industrial tanks. |
| 2B | Cold rolled, annealed, pickled, skin-passed | 0.2-0.5 micrometre | Low | General fabrication - the default mill finish and best welding surface. |
| BA (No. 2BA) | Bright annealed in a controlled atmosphere | 0.05-0.1 micrometre | Low-moderate | Reflective trim, appliance and automotive trim. |
| No. 3 | Intermediate polished, 100-120 grit | 0.4-1.0 micrometre | Moderate | Pre-polish stage and some equipment surfaces. |
| No. 4 | Brushed satin, 150-180 grit | 0.3-0.8 micrometre | Moderate | Architectural panels, food equipment, elevator cabs - the visible default. |
| No. 8 | Mirror, polished and buffed non-directional | 0.05 micrometre or less | High | Decorative feature panels, signage, premium product. |
| PVD colour | Physical vapour deposition over polished substrate | Substrate dependent | High | Architectural cladding, signage, decorative panels. |
Specify protective film on every polished or colour-coated sheet - PVC for general handling, laser film if the sheet will be laser-cut. It is cheap insurance and it is the single most common omission on sheet purchase orders.
Vet a supplier on four things: certified quality system, EN 10204 3.1 documentation with heat-number traceability, in-house positive material identification, and realistic stated lead times. Price differences between qualified suppliers are usually smaller than the cost of one rejected heat.
316 sheet supplier vetting checklist
| Check | What good looks like | Red flag |
|---|---|---|
| Quality system | ISO 9001 certified, certificate current and in scope for flat products | Certificate expired, or scoped only to trading. |
| Mill test report | EN 10204 3.1 as standard; 3.2 available on request | "Certificate of conformity" only, with no actual analysis. |
| Traceability | Heat number stencilled on the sheet or tag and matching the MTR | Unmarked bundles or a generic MTR for the whole lot. |
| Chemistry verification | Portable XRF / PMI gun used on incoming and outgoing material | No PMI capability and no willingness to allow third-party testing. |
| Specification currency | Quotes to a named edition of ASTM A240/A240M and A480/A480M | "Equivalent to 316" with no standard named. |
| Dimensional compliance | Thickness and flatness stated against ASTM A480 tolerances | No tolerance stated, or "nominal" only. |
| Surface protection | Interleaving or PVC film on polished product, export-grade packing | Bare polished sheets strapped together. |
| Lead time honesty | Stated lead time broken into production, testing and freight | One optimistic number with no breakdown. |
If your project is regulated - pressure equipment, marine classification, nuclear, or pharmaceutical - add third-party inspection at the mill before shipment. The cost is a small fraction of the order and it is the only way to be certain before the material lands on your dock.
A complete request for quotation names the grade and standard, exact thickness with tolerance, width and length, quantity by weight, finish, edge condition, MTR type and packing. Incomplete RFQs get a placeholder price that changes once the mill reviews the real requirement.
Send suppliers the following and you will get comparable, firm quotes back on the first round. This is also the fastest way to see who is reading your enquiry properly:
Grade and standard - for example "316L, UNS S31603, to ASTM A240/A240M, latest edition, with ASTM A480/A480M tolerances".
Thickness - give both the gauge and the decimal, for example "16 ga (0.0598 in / 1.52 mm)", and state whether it is a minimum or a nominal thickness.
Width and length - sheet, coil or cut-to-length, and the quantity of each size.
Quantity - in pieces and in total kilograms or pounds, because mill pricing is by weight.
Finish and direction - 2B, No. 4 (and grit), No. 8, BA; state the polish direction if the panels will be installed in a visible pattern.
Edge condition and flatness - mill edge, slit edge, deburred, or levelled to a stated flatness tolerance.
Documentation - EN 10204 3.1 minimum, 3.2 if third-party witnessed, plus any PMI requirement.
Surface protection and packing - PVC or laser film, interleaving, export crating, and whether fumigated timber is required.
Delivery terms - Incoterms (EXW, FOB, CIF, DDP), destination port, and required delivery date.
Special requirements - positive material identification, ultrasonic testing, restricted country of melt, or heat-treatment condition.
Send the same RFQ to at least three suppliers - one mill, one service center and one local or online source. Their responses will differ in lead time far more than in price, which tells you which constraint actually matters for your job.
Fabricate 316 sheet with dedicated stainless tools, weld it with ER316L filler at low heat input, remove heat tint, and passivate to ASTM A967. Most 316 corrosion failures in service trace back to free-iron contamination in the shop, not to the alloy.
Receive and store. Check the heat number against the MTR, keep the sheet in its packing until use, and store it away from carbon steel grinding dust and fabrication debris.
Mark and lay out. Use a low-chloride marker or a pencil, never a lead pencil or a carbon-steel scribe. Chloride-bearing marking inks can initiate pitting.
Cut. Shear, laser, plasma or waterjet are all suitable. Deburr sheared edges and remove laser dross, because a rough edge is a corrosion initiation site.
Form. Annealed 316 bends readily at a minimum inside radius of roughly one times the thickness. Allow for more springback than you would with carbon steel.
Weld. Use GTAW or GMAW with ER316L filler, argon backing on the root, low heat input, and interpass temperature below about 150 degrees C.
Remove heat tint. Grind, brush with a stainless-only brush, or pickle the weld zone. Heat tint is a chromium-depleted layer and it will rust.
Clean and passivate. Follow ASTM A380 for cleaning and descaling and ASTM A967 for passivation - nitric acid types Nitric 1-4, or citric acid types Citric 1-5.
Install with isolation. Use stainless or compatible fasteners and isolate the sheet from carbon steel supports with a non-metallic gasket or sleeve to prevent galvanic corrosion and iron transfer.
The recurring failure mode is contamination, not alloy deficiency. A shop that grinds carbon steel with the same wheel, or stores 316 sheet under a fabrication bay, will embed free iron in the surface and the sheet will rust regardless of how good the heat analysis is.
316 sheet is used wherever chlorides meet stainless steel: marine hardware and hull linings, chemical tanks and ducting, pharmaceutical and food process equipment, coastal architectural cladding, heat exchangers and desalination plant.
Marine and offshore - hull linings, deck fittings, railings, piping and wet-exhaust ducting. See marine engineering applications.
Chemical and petrochemical processing - tanks, reactors, piping, scrubber and ductwork casings. See chemical equipment.
Pharmaceutical and biotechnology - process vessels, piping and work surfaces, typically in 316L with a 2B or electropolished finish.
Food and beverage processing - tanks, conveyors, work surfaces and cookware, generally in 316L with a No. 4 finish for cleanability.
Architecture and construction - coastal cladding, roofing, fasteners, balustrades and feature panels. See construction applications.
Oil and gas and LNG - process skids, cryogenic pipe supports, heat exchanger shells. See oil and gas applications.
Water and desalination - brine handling, reverse osmosis skids and filter housings.
For the full range of grades JN Alloy supplies in flat-rolled form, see the stainless steel overview and alloy plate products.
A seven-step process for specifying, sourcing and verifying 316 stainless steel sheet from mill-direct, distributor or retail suppliers.
Define the service environment. Identify the chloride load, operating temperature and whether the part will be welded. Welded parts in any chloride environment should be specified as 316L rather than 316.
Convert the drawing callout into an orderable thickness. Translate the gauge number to decimal inches and millimetres using the Brown and Sharpe chart, and confirm whether it is sheet (under 3/16 in) or plate (3/16 in and over).
Choose the finish. Specify 2B for welded or concealed work, No. 4 brushed for visible surfaces, and No. 8 mirror only for decorative panels. Add PVC or laser protective film to polished sheet.
Select the buying channel by quantity. Above roughly 500 lb of one size, request a mill-direct quotation. Below that, use a service center for cut-to-length or a local and online retailer for single sheets.
Write a complete RFQ. State grade and UNS number, ASTM A240/A240M and A480/A480M, thickness, width, length, quantity by weight, finish, edge condition, EN 10204 certificate type and Incoterms.
Vet the supplier and the paperwork. Confirm ISO 9001 certification, require EN 10204 3.1 minimum, verify the heat number on the sheet matches the certificate, and check the actual molybdenum result is 2.00-3.00%.
Inspect on receipt and passivate after fabrication. Verify dimensions and surface on arrival, keep the sheet isolated from carbon steel during fabrication, remove heat tint, then passivate to ASTM A967.
Where can I buy 316 stainless steel sheet?
You can buy 316 stainless steel sheet from four channels: mill-direct producers such as JN Alloy and Zhengzhou Huitong (lowest price per pound, 1-5 tonne minimums, 3-8 week lead times), full-line service centers such as Ryerson and Reliance Steel (stock, cut-to-length, immediate shipment), local metal supermarkets and online retailers such as McMaster-Carr and OnlineMetals (single sheets, no minimum, highest price per pound), and specialty finishers for PVD colour, perforated or No. 8 mirror sheet. Choose mill-direct when your order exceeds roughly 500 lb of one size; choose a service center or retailer below that.
Is 316 or 316L better for stainless steel sheet?
For most fabricated sheet work, 316L is the better choice. 316L caps carbon at 0.03% versus 0.08% for 316, which prevents chromium carbide precipitation in the heat-affected zone of welds and removes the need for post-weld annealing. 316L has slightly lower minimum tensile strength (485 MPa versus 515 MPa under ASTM A240/A240M), so specify 316 - or 316H - only when you need the higher allowable stress at elevated temperature, above roughly 425 degrees C.
What is the difference between 316 and 304 stainless steel sheet?
The practical difference is molybdenum. 316 contains 2.00-3.00% molybdenum and 304 contains none, which raises 316's pitting resistance equivalent number (PREN) from roughly 19 to roughly 25. 316 costs about 20-40% more than 304 and is the right choice wherever chlorides are present - coastal air, de-icing salt, brine, bleach or process chemicals. For dry indoor applications, 304 gives the same appearance and strength for less money.
What thicknesses does 316 stainless steel sheet come in?
316 sheet is stocked from 30 gauge (0.0125 in / 0.32 mm) through 7 gauge (0.1793 in / 4.55 mm) under the Brown and Sharpe gauge system, and plate continues from 3/16 in (4.76 mm) upward to several inches. The most commonly stocked architectural and fabrication gauges are 22 ga (0.0299 in), 20 ga (0.0359 in), 18 ga (0.0478 in) and 16 ga (0.0598 in). Mill-direct orders can be produced to any gauge in that range rather than only what the distributor happens to stock.
How much does 316 stainless steel sheet cost per pound?
As a working planning figure, plain 2B 316 sheet has run roughly $4.50-$6.50 per pound for 16 gauge and $4.75-$7.00 per pound for 1/8 in, with No. 4 brushed at $5.50-$8.00 per pound and No. 8 mirror at $8.00-$12.00+ per pound. The real driver is the nickel and molybdenum surcharge, which moves daily on the LME, plus thickness, finish, order size and freight. Always request a dated quotation rather than relying on a published list.
Can I buy a single sheet of 316 stainless steel?
Yes. Local metal supermarkets and online retailers sell single sheets and cut pieces with no minimum order, and will usually shear to your exact size for a cutting fee. Expect to pay a significant premium per pound versus mill-direct - often 40-100% more - because the distributor absorbs handling, cutting and small-lot overhead. Confirm before ordering that a mill test report is available, because some small-lot resellers ship without traceability paperwork.
Does 316 stainless steel rust?
316 resists rust far better than 304 or carbon steel, but it is stain-less, not stain-proof. It can still develop rust-coloured staining from three sources: free iron particles transferred from carbon steel tools or grinding dust, chloride pitting in warm stagnant seawater or bleach residues, and heat tint from welding that was never removed. Dedicated stainless tools, routine cleaning, and passivation to ASTM A967 restore the passive layer in nearly every case.
Is 316 stainless steel magnetic?
Annealed 316 sheet is austenitic and effectively non-magnetic, with magnetic permeability close to 1.02. Cold working during forming, bending or levelling partially transforms the structure to martensite, so a formed corner may show a weak magnetic pull. This is normal and does not indicate a wrong grade; a positive material identification (PMI) gun is the reliable way to confirm molybdenum content.
Do I need a mill test report when buying 316 sheet?
Yes for any structural, pressure, marine, food-contact or pharmaceutical use. Request an EN 10204 3.1 certificate at minimum, which is issued and signed by the mill and ties the heat number on the sheet to its actual chemical analysis and mechanical test results. For pressure vessels or critical service, specify EN 10204 3.2, where an independent third party witnesses and countersigns the results.
What is the difference between stainless steel sheet and plate?
Under common North American practice, sheet is flat-rolled product under 3/16 in (4.76 mm) thick and 24 in (610 mm) or wider, while plate is 3/16 in and thicker and over 10 in (254 mm) wide. Strip is narrower than 24 in, and foil is under about 0.006 in. The boundary matters because ASTM A240/A240M publishes different tolerance tables and mechanical test requirements for the two product forms.
Which finish should I choose for 316 sheet, 2B or No. 4?
Choose 2B when the sheet will be welded, formed, or hidden - it is the cold-rolled, annealed and pickled standard mill finish, the cheapest per pound, and the best welding surface because there is no abrasive contamination to remove. Choose No. 4 brushed for visible architectural and equipment surfaces, and No. 8 mirror only for decorative feature panels, because it costs roughly double and shows every scratch.
Can you weld 316 stainless steel sheet?
Yes, and it welds readily by GTAW, GMAW and resistance welding. Use ER316L filler for both 316 and 316L base metal, keep heat input low with interpass temperature under about 150 degrees C, shield the root side with argon backing, and remove heat tint mechanically or chemically before passivating. If the assembly will not be annealed after welding, order 316L rather than 316 to avoid sensitisation and later intergranular corrosion.
What is 316 stainless steel sheet used for in marine environments?
The main marine uses are hull linings and doubler plates, deck fittings and hardware, railing and lifeline components, fish-hold and galley linings, exhaust and wet-exhaust ducting, and desalination and ballast-water piping. Molybdenum gives 316 the chloride pitting resistance that 304 lacks, but for permanently immersed or creviced service, specify a higher-alloyed grade such as duplex 2205, AL-6XN or a 6% molybdenum superaustenitic.
Is 316 stainless steel food safe?
Yes. 316 is widely used for food and beverage process vessels, conveyors, work surfaces and cookware because its smooth, non-porous finish is easy to clean and sanitise and it resists the chloride-bearing sanitisers used in washdown. Specify a No. 4 or 2B finish with smooth welded seams ground flush, and confirm the supplier can supply material to a food-contact declaration if your auditor requires one.
How do I clean and passivate 316 stainless steel sheet?
Cleaning and descaling follows ASTM A380 and passivation follows ASTM A967. In practice: remove oil and grease with an alkaline or solvent cleaner, remove heat tint and free iron with a pickling paste or a nitric-hydrofluoric bath, rinse with low-chloride water, then passivate in a nitric acid (A967 Nitric 1-4) or citric acid (A967 Citric 1-5) bath to rebuild the chromium oxide film. Never use carbon steel wire brushes or grinding wheels that previously touched carbon steel.
What is the typical lead time for 316 stainless steel sheet?
Service centers ship stocked gauges the same week, often the same day, and online retailers ship cut pieces in one to three days. Mill-direct orders take longer - typically three to eight weeks for standard sizes and finishes, and eight to fourteen weeks for non-standard gauge, wide plate or PVD colour. Add freight time: roughly one to two weeks for ocean freight from Asia to the US or Northern Europe.
Which standards should I specify when ordering 316 sheet?
Specify ASTM A240/A240M as the material specification, ASTM A480/A480M for general flat-rolled requirements including tolerances, ASTM A666 if the sheet is cold-worked architectural product, ASME SA-240 for pressure vessel service, and EN 10088-2 with grade 1.4401 (316) or 1.4404 (316L) for European projects. JIS G4304 and G4305 cover Japanese hot-rolled and cold-rolled product.
Why is 316 more expensive than 304 stainless steel?
Two alloy surcharges. 316 carries roughly 10-14% nickel versus 8-10.5% for 304, and it adds 2-3% molybdenum, which 304 does not contain at all. Molybdenum is the larger driver on a percentage basis and is also the more volatile of the two on the spot market, so the 316 over 304 premium widens whenever molybdenum prices spike.
What is the minimum order quantity for mill-direct 316 sheet?
Mill-direct minimums are normally set per size and grade rather than per order: expect roughly one to five tonnes per thickness, width and finish combination, with a total order value threshold that many mills set between $3,000 and $10,000. Below that, buying from a service center is cheaper once you count freight, handling and the cash tied up in inventory.
How do I verify a supplier's 316 sheet is genuine?
Four checks catch almost every problem. First, match the heat number stencilled on the sheet or bundle tag to the heat number on the EN 10204 3.1 mill test report. Second, review the report's actual molybdenum result - it must fall between 2.00% and 3.00%. Third, run a portable XRF positive material identification gun on the sheet surface to confirm chromium, nickel and molybdenum. Fourth, buy only from sellers whose quality system is certified to ISO 9001.
