碳 硅 锰不同

按照国标

Q195

【化学成分】（质量分数）（%）

C：≤0.12

Mn：≤0.50

Si：≤0.30

S：≤0.040

P：≤0.035

脱氧方法：F、b、Z

Q235

Q235分A、B、C、D四级(GB/T 700-2006)

Q235A级含 C ≤0.22% Mn ≤1.4% Si ≤0.35% S ≤0.050 P ≤0.045

Q235B级含 C ≤0.20% Mn ≤1.4% Si ≤0.35% S ≤0.045 P ≤0.045

Q235C级含 C ≤0.17% Mn ≤1.4% Si ≤0.35% S ≤0.040 P ≤0.040

Q235D级含 C ≤0.17% Mn ≤1.4% Si ≤0.35% S ≤0.035 P ≤0.035