Does Q235 strength decrease with increasing thickness?
Answer: Yes. 16~40mm: 225MPa; 40~60mm: 215MPa; 60~100mm: 205MPa.
Is Q235 suitable for welding?
Answer: Very suitable. Low carbon equivalent, soft heat-affected zone, not prone to cracking, suitable for arc welding and gas shielded welding.
Can Q235 be cold-bent?
Answer: Yes. 180° cold bending, mandrel diameter d=1.5a (a = thickness), not prone to cracking.
What is the difference between Q235 and Q355 (formerly Q345)?
Answer: Q235 has a yield strength of 235MPa, low carbon content, is cheaper, and welds better; Q355 has higher strength (355MPa), is more expensive, and is used for heavy loads.
How to choose Q235 grade in construction? A: Normal temperature general structure → B; around 0℃ → C; -20℃ severe cold → D; static load is not important → A.