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| Grade | Code | AISI | UNS | Austenitic Stainless Steel |
| 1.4301 | X5CrNi18-10 | 304 | S30400 | |
| 1.4307 | X2CrNi18-9 | 304L | S30403 |
AISI 304/304L, is an austenitic stainless steel grade offering good corrosion resistance, high formability and excellent weldability. The lower carbon content of 304L reduces the risk of intergranular corrosion, particularly in welded applications. Both grades are versatile and reliable materials for general industrial service.
| Grade | C % | Si % | Mn % | P % | S % | Cr % | Ni % | N % | Fe % |
| AISI 304 / UNS S30400* | ≤0.070 | ≤0.75 | ≤ 2.00 | ≤0.045 | ≤0.030 | 17.50–19.50 | 8.00–10.50 | ≤0.10 | Bal. |
| AISI 304L / UNS S30403* | ≤0.030 | ≤0.75 | ≤2.00 | ≤0.045 | ≤0.030 | 17.50–19.50 | 8.00–12.00 | ≤0.10 | Bal. |
* ASTM A240 chemical composition limits
| Grade | Condition | Rp0.2 MPa | Rm MPa | A % | Hardness HRB | Density g/cm³ |
| 1.4301* | Annealed | ≥ 205 | ≥ 515 | ≥ 40 | ≤ 92 | 7.90 |
| 1.4307* | Annealed | ≥ 170 | ≥ 485 | ≥ 40 | ≤ 92 | 7.90 |
* ASTM A240 – annealed plate, sheet and strip, at room temperature
| Industry | Commonly Manufactured Products |
| Food and Beverage Industry | Process and storage tanks, piping systems, valves and fittings |
| Chemical Industry | Process tanks, flanges, pipes and fittings |
| Pharmaceutical Industry | Process vessels, piping systems, heat exchangers |
| Petrochemical and Process Industry | Flanges, valves, fittings and couplings |
| Kitchen and HoReCa | Sinks and washing units, worktops, commercial kitchen equipment |
| Architecture and Construction | Facade and decorative cladding, railings, door and window components |
| Machinery and General Industry | Shafts, bolts and nuts, rings and machine components |
| Tank and Storage Systems | Storage tanks, tank containers, process vessels |
| Heat Transfer and Energy | Heat exchangers, pipes, flanges and valves |
| Pulp and Paper Industry | Pipes and fittings, valves, couplings and machine components |
AISI 304/304L, retains good toughness at low temperatures and is essentially non-magnetic in the annealed condition. It cannot be hardened by heat treatment, but cold working increases strength and may induce partial magnetism. Its work-hardening tendency requires suitable cutting tools and machining parameters. In chloride-rich environments, pitting and crevice corrosion can limit performance, making more highly alloyed stainless grades preferable.
AISI 304, 1.4301, X5CrNi18-10, UNS S30400
AISI 304L, 1.4307, X2CrNi18-9, UNS S30403
| Product Form | AISI 304 – ASTM | AISI 304 – AMS | AISI 304L – ASTM | AISI 304L – AMS |
| Rod / Bar | ASTM A276 / ASTM A479 | AMS 5639 | ASTM A276 / ASTM A479 | AMS 5647 |
| Plate | ASTM A240 | AMS 5513 | ASTM A240 | AMS 5511 |
| Sheet | ASTM A240 | AMS 5513 | ASTM A240 | AMS 5511 |
| Pipe / Tube | ASTM A312 / ASTM A269 / ASTM A213 | AMS 5560 / AMS 5567 | ASTM A312 / ASTM A269 / ASTM A213 | AMS 5647 / AMS 5569 |
| Grade | Why Consider This Grade? |
| 316 / 316L | Higher corrosion resistance than 304/304L, especially in chloride-containing environments. |
| AISI 317 | Higher molybdenum content than 316, providing greater resistance in more demanding corrosive environments. |
| 904L – 1.4539 | High-nickel, high-molybdenum austenitic grade for more aggressive chemical and acidic environments. |
Outokumpu, Core 304/4301 (AISI 304) and Core 304L/4307 (AISI 304L)
Aperam, 304 – 1.4301 and 304L – 1.4307
Acerinox, EN 1.4301 / AISI 304 and EN 1.4307 / AISI 304L
Note: The information contained in this datasheet is for informational purposes only; no liability is accepted.
