Q: What do "Q" and "235" mean in Q235 steel plate?
A: "Q" stands for the first letter of the pinyin for yield strength. "235" indicates that the minimum yield strength is 235 MPa for steel plates with a thickness ≤ 16 mm.
Q: What national standard does Q235 steel plate comply with?
A: It complies with the national standard GB/T 700-2006 "Carbon Structural Steel".
Q: What are the different quality grades of Q235 steel plate?
A: It is divided into four quality grades: A, B, C, and D. The core differences lie in the sulfur (S) and phosphorus (P) content and impact test requirements.
Q: What are the core differences between the different quality grades of Q235?
A: The sulfur and phosphorus content decreases sequentially (A > B > C > D), and the impact test requirements become progressively stricter. Q235A has no impact requirements, while Q235D can undergo impact testing at -20℃.
Q: Is Q235 steel plate classified as low-carbon steel or medium-carbon steel?
A: It is classified as low-carbon steel, with a carbon content generally ≤0.22% (slight variations may occur between different grades).