Hardness?
Untreated: HB≤201 / HRC＜20.
Elastic Modulus?
Approximately 200~210 GPa.
Density?
7.85 g/cm³ (density of ordinary steel).
How is the weldability of Q235?
Very good (low carbon, low impurities), suitable for arc welding, gas shielded welding, submerged arc welding, and spot welding.
Is post-weld heat treatment required?
Generally not; heavy-load/dynamic-load structures can undergo stress-relieving annealing at 500~600℃.