元素 | 规定化学成分 上限值 | 允许偏差 | |
上偏差 | 下偏差 | ||
C | ≤0.30 | 0.01 | 0.01 |
>0.30~0.75 | 0.02 | 0.02 | |
>0.75 | 0.03 | 0.03 | |
Mn | ≤1.00 | 0.03 | 0.03 |
>1.00~2.00 | 0.04 | 0.04 | |
>2.00~3.00 | 0.05 | 0.05 | |
>3.00 | 0.10 | 0.10 | |
Si | ≤0.37 | 0.02 | 0.02 |
>0.37~1.50 | 0.04 | 0.0 | |
>1.50 | 0.05 | 0.05 | |
Ni | ≤1.00 | 0.03 | 0.03 |
>1.00~2.00 | 0.05 | 0.05 | |
>2.00~5.00 | 0.07 | 0.07 | |
>5.00 | 0.10 | 0.10 | |
Cr | ≤0.90 | 0.03 | 0.03 |
>0.90~2.10 | 0.05 | 0.05 | |
>2.10~5.00 | 0.10 | 0.10 | |
>5.00 | 0.15 | 0.15 | |
Mo | ≤0.30 | 0.01 | 0.01 |
>0.30~0.60 | 0.02 | 0.02 | |
>0.60~1.40 | 0.03 | 0.03 | |
>1.40~6.00 | 0.05 | 0.05 | |
>6.00 | 0.10 | 0.10 | |
V | ≤0.10 | 0.01 | - |
>0.10~0.90 | 0.03 | 0.03 | |
>0.90 | 0.05 | 0.05 | |
W | ≤1.00 | 0.04 | 0.04 |
>1.00~4.00 | 0.08 | 0.08 | |
>4.00~10.00 | 0.10 | 0.10 | |
>10.00 | 0.20 | 0.20 | |
Al | ≤0.10 | 0.01 | - |
>0.10~0.70 | 0.03 | 0.03 | |
>0.70~1.50 | 0.05 | 0.05 | |
>1.50 | 0.10 | 0.10 |