304L is a variation of 304 and has a lower carbon content which improves weldability and lowers the risk of reduced corrosion resistance around the weld.
ASTM A240 304/304L stainless steel products are used for tanks, tools, food industry machinery and appliances, architectural trim, filtration screens, and fasteners in corrosive marine environments.
304/304L chemical composition
| Type | C | Mn | P | S | Si | Cr | Ni |
| 304 | 0.07 | 2.00 | 0.045 | 0.030 | 0.75 | 17.5-19.5 | 8.0-10.5 |
| 304L | 0.030 | 2.00 | 0.045 | 0.030 | 0.75 | 17.5-19.5 | 8.0-12.0 |
304/304L mechanical properties
| Tensile strength, min | Yield strength, min | Elongation in 2 in or 50 mm,min,% | Hardness,max | ||||
| Ksi | Mpa | Ksi | Mpa | Brinell | Rockwell | ||
| Austenitic (chromium-nickel)(chromium-manganese-nickel) | |||||||
| 304 | 75 | 515 | 30 | 205 | 40 | 201 | 92 |
| 304L | 70 | 485 | 25 | 170 | 40 | 201 | 92 |
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