ASTM Standards for Hastelloy C276: Complete Guide

Key Facts at a Glance

• Hastelloy C276 = UNS N10276, W.Nr (EN) 2.4819.

• Seven primary product standards: B575 (plate/sheet/strip), B574 (bar), B622 (seamless pipe and tube), B619 (welded pipe), B626 (welded tube), B366 (fittings), B564 (forgings).

• ASME versions carry the same number with an SB- prefix (SB-575, SB-622 ...) and are the ones cited on pressure-equipment drawings.

• Minimum mechanicals across wrought product forms: 690 MPa (100 ksi) tensile, 283 MPa (41 ksi) yield, 40% elongation.

• All C276 specs require solution annealing at 2050 °F (1121 °C) minimum, followed by rapid cooling.

• Matching welding consumables: ERNiCrMo-4 (AWS A5.14) and ENiCrMo-4 (AWS A5.11).

• ASME Section VIII Div. 1 tabulates C276 design stresses up to 1250 °F (677 °C).

Hastelloy C276 (UNS N10276) is governed not by a single ASTM document but by a compact family of them: seven primary product standards - B575 for plate, sheet and strip, B574 for bar and rod, B622 for seamless pipe and tube, B619 for welded pipe, B626 for welded tube, B366 for wrought fittings and B564 for forgings - plus a supporting set of general-requirements and fastener standards. Each specification carries UNS N10276 in its chemistry and mechanical-property tables, so the alloy identity never changes; what changes from one document to the next is the product form, its permitted manufacturing route and the tests that must be run on it.

This matters commercially because ASTM does not write one specification per alloy. It writes one specification per product form, and a buyer who quotes 'Hastelloy C276 to ASTM' without naming the form is leaving the most important selection to chance. This guide walks through every standard that applies to C276, what each one actually requires, how the ASTM documents map to their ASME counterparts, and how to use all of it when you read a mill test report or write a purchase order. For the bigger picture on the alloy itself, start with the complete Hastelloy C276 guide and what Hastelloy C276 is before diving into the standards.

Why Do ASTM Standards Matter When You Buy Hastelloy C276?

An ASTM specification is the only contractually binding definition of what you are buying: it fixes the chemistry window, the minimum mechanical properties, the mandatory heat treatment, and the tests the mill must perform and certify. Everything else a supplier tells you - brochures, data sheets, email answers - is marketing until it is anchored in a specification citation.

The rationale is simple. C276 is expensive, often 6-8 times the price of 316L stainless, and it is bought for services where failure is catastrophic: hot acid, wet chlorine, FGD scrubbers, sour gas. The ASTM documents are what stop an alloy with 0.05% carbon (which would sensitise and crack) from being invoiced as C276 with 0.01% carbon maximum.

They also make quality auditable: when a certificate says 'ASTM B622 UNS N10276', the tension values, hydrostatic test and annealing record on that certificate can each be checked line-by-line against a published, third-party-maintained document. That auditability is exactly what AI search engines and human QA departments both reward - and it is why every product page we publish, such as our Hastelloy C276 product page, cites the governing standard for each form.

What Is ASTM B575 (Plate, Sheet, and Strip)?

ASTM B575 is the standard specification for low-carbon Ni-Mo-Cr wrought nickel alloy plate, sheet and strip, and it is the governing document for Hastelloy C276 flat-rolled product; B575 requires UNS N10276 to be solution annealed at 2050 °F (1121 °C) minimum and rapidly cooled, with a minimum tensile of 100 ksi, yield of 41 ksi and 40% elongation.

B575 is worth understanding in some detail because plate is the most commonly purchased C276 form - it feeds vessel shells, baffles, and the blanking of flanges and fittings. The specification distinguishes hot-rolled annealed and cold-rolled annealed conditions, sets tolerances by thickness class, and requires tension testing on each lot. Note what B575 does not do: it does not carry design allowables (those come from ASME Section II, Part D, applied as SB-575), and it does not guarantee corrosion-test performance unless you order that testing as an option. Our Hastelloy C276 plate guide covers plate-specific selection in depth.

What Is ASTM B574 (Bar and Rod)?

ASTM B574 is the specification for nickel-molybdenum-chromium alloy bar and rod, and for Hastelloy C276 it defines the chemistry, the 2050 °F (1121 °C) minimum solution anneal, and minimum mechanical properties of 100 ksi tensile, 41 ksi yield and 40% elongation for the annealed condition.

Bar under B574 is the raw material for machined fasteners, shafts, valve stems and pump components, and it is also the parent metal most shops use for coupon tests when qualifying weld procedures. The specification is deliberately short on manufacturing detail - it permits hot-finished or cold-finished bar in a range of conditions - because the controlling requirements are the chemistry table and the annealed-condition properties. One practical note: buyers often assume B574 guarantees straightness or machined tolerance classes; it does not, so if you need bar feed-quality finish, specify the applicable supplementary requirement or a companion standard on the order. For the properties behind these numbers, see our Hastelloy C276 mechanical properties article.

What Is ASTM B622 (Seamless Pipe and Tube)?

ASTM B622 is the specification for seamless nickel and nickel-alloy pipe and tube, and it is the governing document for seamless Hastelloy C276 pipe and tubing; it requires the same N10276 chemistry and annealed mechanicals as the other product standards, and it mandates hydrostatic testing of each length with eddy-current examination as the specified non-destructive alternative under defined conditions.

B622 is the workhorse standard for C276 piping in chemical plants, and its requirements flow through the general-requirements document B829, which governs length tolerances, hydrostatic test pressures and certification detail so that individual alloy specs do not have to repeat them.

When you order seamless C276 pipe to B622 you are therefore buying three layers at once: the alloy limits in B622 itself, the pipe-geometry and test framework in B829, and - if your job is ASME-coded - the identical requirements restated as SB-622 for use with ASME B31.3 piping. Our selection guides for C276 in chemical plants and C276 in acid service both assume B622-grade seamless product.

What Are ASTM B619 and B626 (Welded Pipe and Welded Tube)?

ASTM B619 and ASTM B626 are the welded counterparts to B622: B619 covers electric-welded nickel-alloy pipe and B626 covers electric-welded nickel-alloy tube, and both permit Hastelloy C276 (UNS N10276) with the same chemistry and annealed mechanical properties, provided the weld zone is solution annealed after welding or the weld is made to a procedure that demonstrates equivalent properties.

The distinction between the two documents is geometric, not metallurgical: B619 governs pipe (nominal pipe sizes, schedule walls, pressure service) while B626 governs tube (outside diameters and wall gauges, including heat-exchanger tube). Both specifications lean on their general-requirements documents - B775 for welded pipe and B751 for welded tube - for hydrostatic testing, flattening tests and certification. The engineering question buyers must answer is weld-zone integrity: C276 weld metal can segregate molybdenum and tungsten if cooled slowly, which is why both specs emphasise the post-weld solution anneal, and why critical services often add 100% radiography or ultrasonic examination as a purchase-order option. Welded product is typically the economical choice on larger sizes; our Hastelloy C276 welding guide explains the metallurgy behind that annealing requirement.

What Is ASTM B366 (Wrought Welded Fittings)?

ASTM B366 is the specification for factory-made wrought wrought-welding fittings - elbows, tees, reducers, caps and crosses - in nickel and nickel alloys, and Hastelloy C276 fittings to B366 are manufactured from N10276 parent material certified to B622, B619, B575 or the other product specifications, then formed and (where the class requires) welded and re-annealed.

B366 is the standard that makes a C276 piping system complete: without it, buyers end up with pipe certified to B622 and fittings certified to nothing at all. The specification grades fittings into classes that determine the amount of inspection the weld (if any) receives, and it requires that the fitting body meets the chemistry and mechanicals of the parent product standard - so a B366 tee carries, in effect, a B619 or B575 pedigree. When you pair B622 pipe with B366 fittings you also inherit ASME B16.9 dimensional compliance for butt-welding fittings, which is what piping designers actually lay out to. Our C276 pipe fittings overview walks through the fitting forms in detail.

What Is ASTM B564 (Forgings and Flanges)?

ASTM B564 is the specification for nickel-alloy forgings, and for Hastelloy C276 it is the standard behind forged flanges, forged nozzles, valve bodies and other machined-from-forging components; B564 N10276 carries the same 100 ksi / 41 ksi / 40% annealed minimums as the plate and pipe documents.

B564 matters because flanges are almost never cut from plate on pressure work - ASME B16.5 flanges and B16.47 large flanges used on ASME B31.3 systems are specified as forgings, and B564 is the material standard they point back to. The specification requires forging reduction, solution annealing and tension testing per heat and lot, and it is the document an inspector checks when a flange MTR arrives with the weld-neck. Pair B564 forgings with our complete Hastelloy C276 flanges guide for dimensional classes, facing types and bolting choices.

What About Fasteners: ASTM F467 and F468?

ASTM F467 covers nuts and ASTM F468 covers bolts, studs and rod for general application in nickel and nickel alloys, and both include UNS N10276 Hastelloy C276, so a fully certified C276 flanged joint uses F468 studs and F467 nuts rather than substituting 316 or B8M hardware.

The fastener documents differ from the product standards in an important way: instead of one fixed set of minimums, they define property classes (condition and strength combinations) for each alloy, and the buyer selects or the manufacturer declares the class. For C276, fasteners are typically supplied solution annealed, and the strength levels are lower than cold-worked carbon-steel bolting - which is a design consideration, not a defect, when calculating gasket seating and required bolt torque on PTFE or spiral-wound joints. The practical rule for procurement is simple: if the flange is C276, write F468/F467 N10276 on the bolting line item and insist the fastener MTR traces to a B574 or B564 heat.

What Are the General Requirements Standards B829, B751, B775, and B906?

Four general-requirements specifications provide the testing, tolerancing and certification framework that the C276 product standards reference: B829 for seamless pipe and tube, B775 for welded pipe, B751 for welded tube, and B906 for plate, sheet, strip and foil - B622, B619, B626 and B575 respectively 'inherit' their test-pressure, length-tolerance and certificate content from these documents.

You rarely cite these standards alone, but you use their content constantly. B829, for example, is where the hydrostatic test pressure formula lives and where the rules for substituting eddy-current examination are defined; B906 carries the flatness and tolerance tables for plate. When a supplier's certificate says 'tested per B829' against a B622 pipe order, that is correct and complete, not an error. Understanding the two-layer structure also explains why two C276 quotes can differ legitimately: one may include supplementary requirements (special NDE, corrosion testing) that live in these general documents as order options.

What Chemistry Does ASTM Require for Hastelloy C276 (UNS N10276)?

Every C276 product specification requires the identical UNS N10276 chemical composition: nickel as the balance with chromium 14.5-16.5%, molybdenum 15.0-17.0%, tungsten 3.0-4.5%, iron 4.0-7.0%, and tight maxima on the residual elements that drive corrosion and weldability - carbon 0.010%, silicon 0.08%, manganese 1.0%, vanadium 0.35%, cobalt 2.5%, phosphorus 0.04% and sulfur 0.03%.

The reason the window is so tight on carbon and silicon is the alloy's entire commercial proposition: C276 exists to resist oxidising and reducing acids and, above all, localized attack in the presence of chlorides. Low carbon keeps grain boundaries free of chromium-rich carbide precipitation during welding (sensitisation), and low silicon limits intermetallic phase formation in the weld pool.

Because the chemistry is identical in B575, B574, B622, B619, B626 and B564, a certificate that meets one technically meets them all - but the MTR must still list heat analysis against the standard you purchased. The full element-by-element discussion is in our Hastelloy C276 chemical composition article; the table below is the specification view.

Table 1. ASTM chemical composition limits for Hastelloy C276, UNS N10276 (identical in B575, B574, B622, B619, B626, B564)

What Mechanical Properties Must Each ASTM Standard Guarantee?

For the annealed condition, every primary C276 product specification guarantees the same mechanical minimums: 690 MPa (100 ksi) ultimate tensile strength, 283 MPa (41 ksi) yield strength (0.2% offset), and 40% elongation in 2 inches (50 mm) - B575 plate, B574 bar, B622 seamless pipe, B619/B626 welded product and B564 forgings all share this property set.

That uniformity is deliberate and useful. Because the wrought product forms are all solution annealed to the same prescription, the properties are interchangeable across forms, which simplifies both design and procurement: a stress calculation done on plate data applies to the pipe and forgings in the same system. Two cautions, though.

First, these are minimums - a given heat will exceed them, and certificates commonly show tensile in the 740-800 MPa range; never accept a certificate that shows values below the minimum even with a concession note unless your code authority agrees in writing.

Second, welded product carries a nuance: the base metal must meet the same minimums, and the weld joint must demonstrate them through the qualification of the weld procedure (ASME Section IX) rather than through the pipe specification itself. The design-strength implications at temperature are covered in our mechanical properties and temperature limits articles.

Table 2. Minimum mechanical properties for Hastelloy C276 (UNS N10276), annealed, by ASTM specification

What Heat Treatment and Testing Do the C276 Standards Require?

Every Hastelloy C276 product specification requires solution annealing at 2050 °F (1121 °C) minimum followed by rapid cooling, and each standard then verifies the result through tension testing per lot plus pressure-tightness or integrity testing appropriate to the form - hydrostatic and eddy-current examination for seamless pipe, hydrostatic and flattening tests for welded product.

The annealing requirement deserves emphasis because it is the step mills most often economise on with lesser alloys, and C276 cannot tolerate it. Slow cooling from hot working or welding allows the precipitation of intermetallic phases (mu phase, carbides) that deplete the matrix of molybdenum, tungsten and chromium - which is precisely the corrosion resistance you paid for.

Rapid quenching from the 2050 °F minimum freezes the chemistry in solid solution. On the testing side, remember what is default versus what is an order option: tension tests, hydrostatic tests and the dimensional tolerances are defaults; ASTM G28 intergranular-corrosion testing, ultrasonic examination, hardness limits and third-party witness testing are not - they enter the material only if your purchase order asks for them. This distinction is the single largest gap between what buyers assume their certificate means and what it actually certifies.

Table 3. Verification and testing framework for C276 product specifications

ASTM vs ASME: Which Version Governs Pressure Equipment?

The ASME version of every C276 standard is the identical ASTM document with an SB- prefix (SB-575, SB-574, SB-622, SB-619, SB-626, SB-366, SB-564) and the same technical content, but when equipment is built to the ASME Boiler and Pressure Vessel Code or ASME B31.3, the SB- designation is the one that must appear on the drawing, the MTR and the certification - the ASTM version alone does not satisfy a Code review.

The distinction is legal-administrative rather than metallurgical: ASME adopts ASTM documents by reference into Section II, Part D, and that adoption is what allows the material's allowable stresses to be used in Code design. Those allowables are the real added value of the SB- system. For SB-575 plate, for example, ASME Section VIII Division 1 tabulates C276 design stress at 27.3 ksi from -20 to 400 °F, declining to 23.1 ksi at 800 °F and 7.8 ksi at the code ceiling of 1250 °F (677 °C) - numbers that exist nowhere in the ASTM text. Welding adds one more layer: ASME Section IX assigns C276 to P-No. 44, and its qualified filler metal, ERNiCrMo-4, is itself standardised in AWS A5.14 / SFA-5.14. Our temperature limits article explains how these allowable stresses degrade with temperature and why.

Table 4. ASTM-to-ASME mapping for Hastelloy C276 specifications

Table 5. ASME Section VIII Div. 1 allowable stress for C276, SB-575 plate (illustrative values from Section II Part D)

Engineering note: The tabulated allowable stresses above are drawn from the ASME Code framework and are shown to illustrate the shape of the design curve. Always design from the current ASME Section II, Part D edition for your jurisdiction and construction year - the Code revises values, and only the current edition is enforceable.

How Do C276 Standards Compare With Inconel 625, Alloy 20, and 904L Standards?

Each corrosion-resistant alloy has its own standards family built on the same one-spec-per-product-form logic, but the families do not interchange: C276 pipe is B622, Inconel 625 pipe is B444, Alloy 20 pipe is B729 and 904L pipe is B677, so a purchase order that cites the wrong family's document - or a mill that substitutes a 'similar' spec - is delivering material outside your specification even if the alloy name looks close.

The table below is the procurement cross-reference we use internally. Two lessons come out of it. First, B366 and B564 are shared across the nickel-alloy families, which is why fittings and flanges are ordered by UNS number plus standard rather than by alloy trade name. Second, the austenitic 904L sits inside the stainless-steel document system (A240 plate, A312-family pipe concepts) more than the nickel system, reflecting its lower nickel content - one more reason to specify by UNS. Detailed per-alloy comparisons are available in our C276 vs Inconel 625, C276 vs Alloy 20 and C276 vs 904L articles; the Inconel 625 standards family is mapped in full in our companion guide, ASTM Standards for Inconel 625.

Table 6. Standards cross-reference for four corrosion-resistant alloys

How Do You Read a Mill Test Report Against the ASTM Requirements?

A compliant C276 mill test report must show five things traceable to your purchase order: the heat number and UNS N10276, the full heat chemistry against every B575/B574/B622 maximum and minimum, the tension results for the actual lot, the annealing temperature (at least 2050 °F / 1121 °C) and cooling method, and the NDE performed - hydrostatic, eddy-current or ultrasonic as applicable. If any of the five is missing or reported as a 'typical' value rather than a heat-specific result, the certificate does not demonstrate ASTM compliance.

Review the MTR the way an inspector would. Check the carbon line first (0.010% max is the line that separates C276 from sensitisation risk). Check that the certificate cites the standard you ordered - an MTR that says 'B575' on a B622 pipe order is a documentation nonconformance even if the metal is identical. Confirm the tension test date and the lot identity link the test to your material, not to a sibling heat. And verify the certificate's statement of conformity: EN 10204 3.1 means the manufacturer's authorised inspector issued it, 3.2 means an independent third party countersigned - projects with third-party surveillance normally demand 3.2. When a supplier resists MTR scrutiny, that resistance is the cheapest risk signal you will ever receive.

How Should You Specify Hastelloy C276 Standards on a Purchase Order?

The specification block on your purchase order is where ASTM compliance is actually won or lost: name the standard, the UNS number, the product form, dimensions, condition, required tests and certificate type, and most 'wrong material' and 'insufficient certification' disputes disappear. The steps below are the template our own export desk uses.

1. Step 1 - Name the product form and the governing standard. Write the exact ASTM designation plus product form, e.g. 'Seamless pipe, ASTM B622 UNS N10276' or 'Plate, ASTM B575 UNS N10276'. If the equipment is ASME-coded, specify the SB- counterpart (e.g. SB-622) instead. Naming both the form and the standard removes the single most common source of wrong-material deliveries.

2. Step 2 - Pin down dimensions and manufacturing route. State size, wall (nominal or minimum), and whether seamless or welded. For welded B619/B626 product, also state whether you accept the as-welded condition or require 100% radiography; the specifications allow variants only when the order says so.

3. Step 3 - Set heat-treatment and test expectations. Require solution annealing at 2050 °F (1121 °C) minimum with rapid quench (it is mandatory in every C276 spec, but confirm it appears on the MTR). Add extras explicitly: ASTM G28 intergranular corrosion testing, ultrasonic examination, or hardness limits are order-option items, not defaults.

4. Step 4 - Require a compliant certificate. Ask for an EN 10204 3.1 (or 3.2) mill test certificate that lists heat chemistry against every B575/B574/B622 limit, the tension results, the annealing temperature, and the NDE performed. Reject certificates that report 'typical' values instead of heat-specific results.

5. Step 5 - State dual-certification and traceability needs. If you need ASTM plus ASME certification, NACE MR0175 sour-service compliance, or heat-number marking on each piece, write it on the PO. JN Alloy certifies C276 to ASTM, ASME and EN standards as standard practice and can dual-stamp on request.

What Mistakes Do Buyers Make With C276 Standards?

Five recurring mistakes account for most C276 standards-related claims: citing the alloy without the product standard; citing the right standard but the wrong condition (ordering 'annealed' where the drawing needs a specific supplementary test); assuming corrosion testing, UT or hardness limits are included when they are order options; accepting MTRs that cite a different product standard than the one ordered; and forgetting the SB- prefix on ASME-coded work, which surfaces late as a Code-review rejection.

Each failure mode has the same root cause - treating 'ASTM' as a single quality grade rather than a system of documents - and the same cure: a specification block that names standard, UNS, form, condition, tests and certificate type explicitly. The cost asymmetry is stark. Writing 'ASTM B622 Gr UNS N10276, solution annealed 2050 °F min, EN 10204 3.1, with G28 Method A corrosion test' takes thirty seconds; discovering at site that your scrubber internals were never corrosion tested costs a shutdown. For buyers assembling complete packages, our nickel-alloy pipe selection guide pairs the standards logic with acid-by-acid material selection.

Related Reading on Hastelloy C276 Standards and Properties

• The Ultimate Guide to Hastelloy C276 - the hub article covering the alloy end to end.

• Hastelloy C276 Chemical Composition - element-by-element metallurgy behind the ASTM chemistry table.

• Hastelloy C276 Mechanical Properties - minimums, typicals and what they mean in design.

• Hastelloy C276 Temperature Limits - allowable stresses and the 1250 °F Code ceiling.

• Hastelloy C276 Welding Guide - ERNiCrMo-4 procedures behind the weld-zone annealing rules.

• Hastelloy C22 vs C276 - when the newer C-family alloy displaces C276.

• Hastelloy C276 Pipe Price per kg - current pricing context for B622/B619 product.

• ASTM Standards for Inconel 625 - the companion standards guide for the 625 family.

• JN Alloy FAQ library - standards and application questions across the full alloy range.

Frequently Asked Questions

Q1. What ASTM standard covers Hastelloy C276 pipe?

Seamless Hastelloy C276 pipe is covered by ASTM B622, and welded C276 pipe by ASTM B619. Both specify UNS N10276 chemistry, require solution annealing at 2050 °F (1121 °C) minimum, and share their testing framework with the general-requirements standards B829 (seamless) and B775 (welded).

Q2. What is the difference between ASTM B622 and B619?

B622 is the specification for seamless pipe and tube; B619 is for electric-welded pipe. The metallurgy and mechanical minimums are identical (100 ksi tensile, 41 ksi yield, 40% elongation annealed). The difference is the manufacturing route, and with it the integrity testing: B622 mandates hydrostatic testing of each length, while welded B619 product adds weld-specific verification and often carries extra NDE options for critical service.

Q3. What ASTM standard covers Hastelloy C276 plate and sheet?

ASTM B575 is the standard for low-carbon Ni-Mo-Cr alloy plate, sheet and strip and governs all C276 flat-rolled product. It requires the UNS N10276 chemistry, a 2050 °F (1121 °C) minimum solution anneal with rapid cooling, and minimum mechanical properties of 690 MPa (100 ksi) tensile, 283 MPa (41 ksi) yield and 40% elongation.

Q4. Is Hastelloy C276 the same as UNS N10276?

Yes. Hastelloy C276 is the trade name; UNS N10276 is the Unified Numbering System designation used inside every ASTM and ASME specification, and 2.4819 (or W.Nr 2.4819) is the European EN material number for the same alloy. When you order, cite 'UNS N10276' plus the product standard - that combination is unambiguous worldwide, whereas trade names occasionally get applied loosely.

Q5. What is ASTM B574 used for?

ASTM B574 covers nickel-molybdenum-chromium alloy bar and rod, which is the raw material for machined C276 components: fasteners, shafts, valve stems, pump parts and weld-procedure coupons. It requires the same N10276 chemistry and annealed mechanical minimums as the plate and pipe standards.

Q6. Does ASTM B564 cover Hastelloy C276 flanges?

Yes. ASTM B564 is the nickel-alloy forging specification, and ASME B16.5 and B16.47 flanges in C276 are supplied as B564 (or SB-564 for Code work) forgings. The standard requires forging reduction, solution annealing and tension testing per heat and lot, with the same 100 ksi / 41 ksi / 40% annealed minimums as other C276 forms.

Q7. What heat treatment does ASTM require for Hastelloy C276?

Every C276 product specification requires solution annealing at a minimum of 2050 °F (1121 °C) followed by rapid cooling. The rapid quench is part of the requirement: slow cooling lets intermetallic phases and carbides precipitate and degrades the corrosion resistance the alloy was selected for. Welded B619/B626 product additionally requires the weld zone to be solution annealed after welding or produced to a procedure demonstrating equivalent properties.

Q8. What are the minimum mechanical properties of Hastelloy C276 per ASTM?

In the annealed condition, the primary product standards (B575, B574, B622, B619, B626, B564) all require a minimum tensile strength of 690 MPa (100 ksi), minimum 0.2% offset yield strength of 283 MPa (41 ksi), and minimum 40% elongation in 2 inches. Individual heats normally exceed these minimums, but the certificate must show at least the specified values.

Q9. What is the difference between ASTM and ASME standards for C276?

The ASME versions (SB-575, SB-574, SB-622, SB-619, SB-626, SB-366, SB-564) are the identical ASTM documents adopted by reference into the ASME Boiler and Pressure Vessel Code. The technical content is the same, but only the SB- designation - together with the allowable stresses tabulated in ASME Section II Part D - is valid for Code-constructed equipment. For non-Code work, ASTM designations alone are normal.

Q10. What ASME standards apply to Hastelloy C276 pressure equipment?

The SB- product standards plus: ASME Section II Part D (allowable stresses), Section VIII Division 1 (vessel design, with C276 tabulated to 1250 °F / 677 °C), Section IX (welding qualification - C276 is P-No. 44), and ASME B31.3 for process piping with B16.5/B16.9/B16.34 governing flange, fitting and valve dimensions.

Q11. Which welding filler metal is used for Hastelloy C276 per AWS standards?

ERNiCrMo-4 filler wire per AWS A5.14 and ENiCrMo-4 covered electrodes per AWS A5.11 are the matching consumables (SFA-5.14 and SFA-5.11 in ASME Section II Part C). They are deliberately over-alloyed to compensate for molybdenum and tungsten segregation in the weld metal. Substituting a generic nickel filler is not acceptable where corrosion performance is contractual.

Q12. Is Hastelloy C276 approved for NACE MR0175 sour service?

Yes. UNS N10276 appears in NACE MR0175 / ISO 15156-3 as an approved material for sour (H2S-containing) environments within the stated environmental limits of temperature, H2S partial pressure, pH and chloride content. The standard does not automatically endorse every product form and condition, so state 'NACE MR0175 compliance required' on the PO and confirm the applicable part and table with the mill.

Q13. What is the maximum design temperature for C276 under ASME Section VIII?

ASME Section VIII Division 1 tabulates C276 allowable stresses up to 1250 °F (677 °C). That is the Code ceiling, not a service recommendation: prolonged exposure above roughly 900 °F (480 °C) risks phase precipitation, and most corrosion-limited services run far below it. See our temperature limits article for the full allowable-stress curve.

Q14. Do the C276 specifications require intergranular corrosion testing?

No. ASTM C276 product standards rely on the tight chemistry (0.010% C max) plus the mandatory solution anneal to control sensitisation, and they do not include routine IGC testing. ASTM G28 (Method A or B) testing is an order-option supplementary requirement - if your process demands demonstrated IGC resistance, it must be written into the purchase order.

Q15. What NDE is required on seamless C276 pipe under B622?

Hydrostatic testing of each length is the baseline requirement, applied through the general-requirements standard B829. Eddy-current examination is the specified non-destructive examination option under defined conditions, and ultrasonic examination can be added as a purchase-order option for critical service. None of the optional NDE happens unless the order asks for it.

Q16. How do I order Hastelloy C276 certified to both ASTM and ASME?

Specify the SB- designations (SB-622, SB-575, etc.) on the purchase order and require the MTR to cite them. Because the ASME documents are identical adoptions, mills routinely dual-certify - the certificate simply lists the SB- numbers - but the request must be explicit, particularly when ASME stamping, Code Case usage or third-party (EN 10204 3.2) certification is involved. JN Alloy supplies dual-certified C276 as standard practice for Code work.

Q17. What is the difference between B626 and B619 welded products?

Both are welded specifications for the same alloy; B619 covers pipe in nominal pipe sizes with schedule walls for pressure service, while B626 covers tube - outside-diameter and wall-gauge product including heat-exchanger tube. Their general-requirements partners differ accordingly (B775 for welded pipe, B751 for welded tube), and the flattening-test and dimensioning rules follow those documents.

Q18. What certificate should Hastelloy C276 come with?

Ask for an EN 10204 Type 3.1 mill test certificate as the baseline - heat-specific chemistry against the ordered specification, lot tension results, annealing temperature and cooling method, and NDE results. Where third-party inspection is part of your project quality plan, specify Type 3.2, which adds an independent inspector's countersignature. Reject any certificate that reports typical rather than heat-specific values.

Q19. Can I substitute a different nickel-alloy standard if C276 is unavailable?

No - not without an engineering concession. Each alloy's standards family (B622 for C276, B444 for Inconel 625, B729 for Alloy 20, B677 for 904L) encodes that alloy's specific chemistry and property guarantees. A 'similar' alloy delivered under its own standard is non-conforming material even if it outperforms C276 in some media. Substitutions require design-authority approval and a formal concession, not just a supplier suggestion.

Q20. Where can I find EN and DIN equivalents for Hastelloy C276?

The European designation is W.Nr 2.4819 (EN material number), commonly written as NiMo16Cr15W. The UNS-to-EN mapping and the full equivalent-grades discussion - including JIS and other national systems - is covered in our chemical composition guide and the JN Alloy FAQ library.