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Stainless Steel 304L(UNS S30403,1.4306/1.4307) is a low carbon austenitic chromium-nickel stainless steel. 1.4306 is a high corrosion resistant version than 1.4307, AISI 304L(1.4307) has equal resistant to intercrystalline corrosion with AISI 321(1.4541).
304L is an economical and versatile corrosion-resistant alloy that is suitable for a wide range of applications for general purposes, the low carbon content of stainless steel 304L combined with the addition of nitrogen makes it possible for 304L to satisfy the mechanical property requirements of 304.
Alloy 304L has excellent resistance against intergranular corrosion in its welded state and has great strength hand toughness at cryogenic temperatures.Stainless steel 304L is non-magnetic in its annealed state, but may become slightly magnetic as a result of cold processing or welding. It is easy to weld and process using standard manufacturing techniques.
Corrosion Resistance
304L stainless steel contains chromium, which forms an oxide layer on its surface. This helps protect against corrosive environments regardless of humidity.
Heat Resistance
304L stainless steel offers exceptional heat resistance. Its properties remain unaffected even when used at temperatures up to 870°C. Its strength and shape remain unchanged even after prolonged exposure to high temperatures.
Machinability
304L stainless steel minimizes carbide precipitation when fabricating or forming parts, making it easier to cut and form. Furthermore, tool wear is reduced, saving you time and money.
Mechanical Properties
The mechanical properties of 304L stainless steel make it suitable for a wide range of applications. Its high tensile and yield strength ensure consistent performance, even at low temperatures.
Weldability
If welding is required, 304L stainless steel ensures a smooth process. Its low carbon content reduces the likelihood of carbide formation in the weld. This material also eliminates the need for post-weld annealing, saving time.
Grade | C≤ | Mn≤ | P≤ | S≤ | Si≤ | Cr | Ni | N≤ |
304L | 0.03 | 2.0 | 0.045 | 0.03 | 0.75 | 18.0-20.0 | 8.0-12.0 | 0.1 |
Tensile, min, ksi[MPa] | Yield, min, ksi[MPa] | Elongation, %(min) | Hardness, HB（max） |
70【485】 | 25【170】 | 40 | 201 |
| Property | 304L Value |
|---|---|
| Density | 8.00 g/cm³ (0.289 lb/in³) |
| Melting Range | 1400–1450°C (2552–2642°F) |
| Thermal Expansion (20–100°C) | 17.2 μm/m·°C (9.6 μin/in·°F) |
| Thermal Conductivity (100°C) | 16.2 W/m·K (112 BTU·in/hr·ft²·°F) |
| Specific Heat (20°C) | 500 J/kg·K (0.12 BTU/lb·°F) |
| Electrical Resistivity | 72 μΩ·cm (720 nΩ·m) |
| Magnetic Permeability | μᵣ = 1.02 (cold-worked: ↑ to 1.5+) |
| Elastic Modulus (20°C) | 193 GPa (28×10⁶ psi) |
| Poisson’s Ratio | 0.29 |
WERKSTOFF NR. | UNS | JIS | BS | GOST | AFNOR | EN |
1.4306/1.4307 | S30403 | SUS304L | 304S11 | 03Х18Н11 | Z3CN18‐10 | X2CrNi18-9 / X2CrNi19-11 |
| Products | Standards | Show |
| 304L Stainless Steel Pipe | ASTM A312 |  |
| 304L Stainless Steel Tube | ASTM A269, ASTM A213 |  |
| 304L Stainless Steel Sheet | ASTM A240 |  |
| 304L Stainless Steel Bars | ASTM A276/A479 |  |
| 304L Stainless Steel Forging/Flange | ASTM A182 |  |
| 304L Stainless Steel BW Fittings | ASTM A403 |  |
Chemical and petrochemical industry.
Foodstuffs industry.
Medical industry.
Mining.
Oil refining.
Pharmaceutical industry.
Nuclear industry.
Waste and paper manufacturing industry.
Properties/ | 304 Steel | 304L Steel | 316 Steel | 316L Steel |
| C | ≤0.08% | ≤0.03% | ≤0.08% | ≤0.03% |
| Cr | 18-20% | 18-20% | 16-18% | 16-18% |
| Ni | 8-10.5% | 8-12% | 10-14% | 10-14% |
| Mo | - | - | 10-14% | 10-14% |
| Properties | Austenitic stainless steel, good corrosion resistance | 304 low carbon version, good resistance to intergranular corrosion | Contains molybdenum, strong resistance to chloride corrosion | 316 low carbon version, stronger resistance to intergranular corrosion |
| Corrosion resistance | Resistant to atmosphere, fresh water, and weak acid | Same as 304, but better corrosion resistance after welding | Resistant to seawater, chemical media and organic acids | Same as 316, better corrosion resistance after welding |
| Weldability | Common | Excellent | Common | Excellent |
Mechanical strength | Tensile strength ≥515 MPa Yield strength ≥205 MPa | Tensile strength ≥485 MPa Yield strength ≥170 MPa | Tensile strength ≥515 MPa Yield strength ≥205 MPa | Tensile strength ≥485 MPa Yield strength ≥170 MPa |
| Heat resistance | better | better | better | better |
| Application | Food processing equipment Chemical containers Architectural decoration Kitchen utensils | Equipment requiring high welding requirements Storage tanks Fine chemical equipment | Seawater environment Chemical equipment Medical equipment Pharmaceutical industry | Seawater environment Chemical equipment Fine chemical equipment High temperature and high pressure equipment |
