SS400 steel is defined in JIS G 3101 standard, which is a Japanese material standard for general structural usage, sheets, strips and rolled steel plates.
SS400 chemical composition
| C | Mn | P | S | |
| SS400 | - | - | 0.050 max | 0.050 max | 
JIS G 3101 SS400 steel mechanical properties
| Grade | Yield point or yield strength N/mm2 | Tensile strength N/mm2 | |||
| Thickness of steel product | |||||
| 16 or under | 16-40 | 40-100 | Over 100 | ||
| SS400 | 245 min | 235 min | 215 min | 205 min | 400-510 | 
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