Q: Is there a unified international designation for Q235?
A: There is no completely corresponding international designation. Approximate correspondences are:
EU: S235JR;
USA: A36;
Japan: SS400.
Q: What are the main uses of Q235?
A: Widely used in building structures (such as steel beams and columns), engineering machinery (such as supports and bases), hardware products (such as bolts and nuts), welded parts, and less critical mechanical parts.
Q: Can Q235 be used to manufacture bearings?
A: No, bearings require high-hardness, high-wear-resistance steel (such as bearing steel GCr15), and Q235 lacks sufficient strength and hardness.
Q: What are the yield strength and tensile strength ranges of Q235?
A: Yield strength ≥235MPa (thickness ≤16mm), tensile strength 375~500MPa.
Q: What is the standard elongation for Q235?
A: Elongation δ₅ ≥26% (thickness ≤16mm). The elongation will decrease slightly as the thickness of the steel increases.