Q235A Chemical Composition?
A: C≤0.22, Si≤0.35, Mn≤1.4, S≤0.050, P≤0.045.
Q235B Chemical Composition?
A: C≤0.20, Si≤0.35, Mn≤1.4, S≤0.045, P≤0.045.
Q235C Chemical Composition?
A: C≤0.18, Si≤0.35, Mn≤1.4, S≤0.040, P≤0.040.
Q235D Chemical Composition?
A: C≤0.17, Si≤0.35, Mn≤1.4, S≤0.035, P≤0.035.
What are the main differences between A/B/C/D?
A: S and P impurities decrease progressively, while low-temperature impact requirements increase progressively.