What is Q235 steel plate?
A: Q235 is a common carbon structural steel (mild steel) with a minimum yield strength of 235 MPa (for thickness ≤16mm). It's also known as A3 steel.
2. What does "Q235" mean?
A: "Q" = Yield strength; "235" = minimum yield strength ≥ 235 MPa.
3. What is the standard for Q235 steel?
A: Mainly GB/T 700-2006 (China); equivalent to ASTM A36, EN S235JR.
4. What are the grades of Q235?
A: Four grades: Q235A, Q235B, Q235C, Q235D.
5. What's the difference between A/B/C/D grades?
A: Mainly impact toughness temperature and S/P content:
A: No impact test; highest S/P
B: 20℃ impact; S≤0.045%, P≤0.045%
C: 0℃ impact; S≤0.040%, P≤0.040%
D: -20℃ impact; lowest S/P (≤0.035%)