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| 牌號 | 化學成分a（熔煉分析） % （質量分數） | ||||
| C | Mn | P | S | Alt | |
| SPCC | ≤0.15 | ≤0.60 | ≤0.10 | ≤0.025 | - |
| SPCD | ≤0.10 | ≤0.45 | ≤0.030 | ≤0.025 | ≥0.015 |
| SPCE | ≤0.08 | ≤0.40 | ≤0.025 | ≤0.020 | ≥0.015 |
| SPCF(SPCEN) | ≤0.008 | ≤0.30 | ≤0.020 | ≤0.020 | ≥0.015 |
| SPCG | ≤0.006 | ≤0.25 | ≤0.020 | ≤0.020 | ≥0.015 |
| a 允許添加其它合金元素。 | |||||
