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Steel grade Q235B is known to all steel insiders and very common on construction site and machinery plants. In Japan, there is steel material as hot as steel grade Q235B in China, that is JIS SS400 steel. Steel grade Q235B equivalent JIS steel material is SS400.
Steel grade Q235B equivalent JIS steel material SS400 chemical composition:
| Grade | C (t≤16mm) | Si | Mn | P | S |
| Q235B | 0.20 max | 0.35 max | 1.40 max | 0.045 max | 0.045 max |
| SS400 | - | - | - | 0.050 max | 0.050 max |
Steel grade Q235B equivalent JIS steel material SS400 mechanical properties:
| Grade | Yield strength ReH/(N/mm2) (t≤16mm) min |
Tensile strength Rm/(N/mm2) (3mm≤t≤16mm) | Elongation A/% (3mm≤t≤40mm) min |
Charpy V test | |
| Temperature/℃ | Impact energy (Longitudinal)/J min | ||||
| Q235B | 235 | 370-500 | 26 | 20 | 27 |
| SS400 | 245 | 400-500 | 21 | - | - |
From steel grade Q235B equivalent JIS steel material SS400 chemical composition and mechanical properties, we can find the two materials have much in common. The common characteristics decide steel grade Q235B and JIS steel material SS400 have common applications also, such as in fields of construction and engineering structures to make high-voltage transmission towers, bridges, vehicles, boilers, containers, ships, etc.
