Q: What does "Q235" in Q235 steel coil mean?
A: "Q" is the first letter of the pinyin for "yield strength," and 235 represents the yield strength value of the steel, i.e., yield strength ≥ 235 MPa.
Q: What type of steel is Q235 steel coil?
A: It belongs to carbon structural steel. Its sulfur and phosphorus content is slightly higher than that of high-quality carbon structural steel. The smelting process is relatively simple, resulting in lower costs.
Q: What are some common sub-grades of Q235 steel coil?
A: Common sub-grades are Q235A, Q235B, Q235C, and Q235D. The main differences lie in the impact test requirements and deoxidation methods.
Q: What is the core difference between Q235A and Q235B?
A: ① Impact test: Q235A does not require an impact test; Q235B requires a room temperature (20℃) impact test. ② Deoxidation method: Q235A is mostly rimmed steel or semi-killed steel; Q235B is mostly killed steel, with more stable mechanical properties.
Question: What national standard does Q235 steel coil conform to?
Answer: It conforms to the national standard GB/T 700-2006 "Carbon Structural Steel". The dimensional deviations of the coil must also comply with GB/T 709-2019 "Dimensions, Shape, Weight and Permissible Deviations of Hot-Rolled Steel Plates and Strips".