What's the difference between Q235 and A3 steel?
A: Same material. A3 is the old Soviet-era designation; Q235 is the new Chinese GB/T 700 name.
Q235 vs Q355: Key differences?
A:
Yield: Q235=235MPa; Q355=355MPa
Alloy: Q235=carbon steel; Q355=low-alloy (Mn, Si)
Use: Q235=general; Q355=high-strength, cold-resistant structures.
Can Q235 be used outdoors?
A: Yes (use Q235C/D) with proper coating; avoid Q235A/B in cold/wet outdoor areas.
Is Q235 suitable for cold bending?
A: Excellent cold bendability: 180° bend test passes; bend diameter d=1.5×thickness (a).
What is the price level of Q235?
A: Low-cost, most economical structural steel in China; cheaper than Q355, 45#, or stainless steel.