What is Q235 steel coil?
It's a national standard carbon structural steel coil, formerly known as A3 steel. Q = yield strength, 235 = yield strength ≥ 235MPa. It's a low-carbon steel (C ≤ 0.22%), with the widest range of applications.
What are the differences between Q235A/B/C/D?
The key differences are impurity content, low-temperature toughness, and deoxidation method:
A: No impact, S ≤ 0.050%, P ≤ 0.045%, rimmed/killed steel.
B: 20℃ impact ≥ 27J, S ≤ 0.045%, P ≤ 0.045%, rimmed/killed steel.
C: 0℃ impact ≥ 27J, S ≤ 0.040%, P ≤ 0.040%, killed steel.
D: -20℃ impact ≥ 27J, S ≤ 0.035%, P ≤ 0.035%, special killed steel.
What is the relationship between Q235 and A3 steel?
For the same material, the old national standard calls it A3, while the new national standard GB/T 700 calls it Q235, with identical composition and properties.
What are the applicable standards for Q235?
Core standard: GB/T 700-2006; Hot-rolled coil: GB/T 11253; Cold-rolled coil: GB/T 13912.
Common specifications for Q235 steel coils?
Hot-rolled: Thickness 1.2–25.4mm, width 1000/1250/1500mm.
Cold-rolled: Thickness 0.5–3.0mm, width 1000/1250mm.