What is Q235 steel plate?
A: Q235 steel plate is a common carbon structural steel plate in China, defined by standard GB/T 700-2006. "Q" stands for yield strength, and "235" means its yield strength ≥ 235 MPa (for thickness ≤ 16mm).
2. What does the designation "Q235" mean?
A: "Q" = Qu (Chinese for yield strength); "235" = minimum yield strength of 235 MPa.
3. What are the main grades of Q235 steel plate?
A: Four quality grades: Q235A, Q235B, Q235C, Q235D.
4. What is the main difference between Q235A and Q235B?
A: Q235A has no impact test; Q235B requires 20°C Charpy V-notch impact test (≥ 27J). Q235B has stricter S/P limits.
5. What is special about Q235C?
A: Q235C requires 0°C impact test (≥ 27J), lower S/P content, and is fully killed (Z) steel.