低合金板
Q235分A、B、C、D四级(GB700-88)
Q235A级含 C 0.14~0.22% Mn 0.30~0.65 Si ≤0.30 S ≤0.050 P ≤0.045
Q235B级含 C 0.12~0.20% Mn 0.30~0.67 Si ≤0.30 S ≤0.045 P ≤0.045
Q235C级含 C ≤0.18% Mn 0.35~0.80 Si ≤0.30 S ≤0.040 P ≤0.040
Q235D级含 C ≤0.17% Mn 0.35~0.80 Si ≤0.35 S ≤0.040 P ≤0.035