1.交货条件的组合
表C.1交货时热处理条件的组合、产品形式和适用要求
2.化学组成
化学成分来源与适用范围
以下为所列标准版本的参考成分，非炉批实测；订单适用标准、原料与成品要求须分别确认。
来源: ISO 4954:2018 · Table C.2 · C35EC · p.41
| 元素 | 质量分数 / % |
|---|---|
| C | 0.32–0.39 |
| Si | ≤0.3 |
| Mn | 0.5–0.8 |
| P | ≤0.025 |
| S | ≤0.025 |
| Cu | ≤0.25 |
Single values are maxima unless indicated otherwise; unlisted elements and blank cells are not assumed zero. Alternative limits, optional additions and analysis tolerances require the relevant table notes and order agreement. This reference table does not replace the complete standard.
3.力学性能
表C.4-不含硼的非合金钢的力学性能
| Steel name | Diameter | Delivery condition | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| +AC or +AC+PE | +AR+C+AC | +AR+C+AC+LC | +AC+C | |||||||
| above mm | up to mm | Rm max. MPa | Z min. % | Rm max. MPa | Z min. % | Rm max. MPa | Z min. % | Rm max. MPa | Z min. % | |
| C35EC C35RC | 2 | 5 | 550 | 62 | 590 | 60 | — | |||
| 5 | 10 | 560 | 60 | 540 | 62 | 580 | 60 | 670 | ||
| 10 | 40 | 560 | 60 | 540 | 62 | 580 | 60 | 660 | — | |
4.淬透性要求
表C.7-具有规定 (正常) 淬透性的不含硼的钢种的硬度限值 (H级)
| Steel name | Sym- bol | Austenitizing temperature °℃±5℃ | Limits of range | Hardness HRC at a distance from quenched end of test piece(in mm) of | Hardness HRC at a distance from quenched end of test piece(in mm) of | Hardness HRC at a distance from quenched end of test piece(in mm) of | Hardness HRC at a distance from quenched end of test piece(in mm) of | Hardness HRC at a distance from quenched end of test piece(in mm) of | Hardness HRC at a distance from quenched end of test piece(in mm) of | Hardness HRC at a distance from quenched end of test piece(in mm) of | Hardness HRC at a distance from quenched end of test piece(in mm) of | Hardness HRC at a distance from quenched end of test piece(in mm) of | Hardness HRC at a distance from quenched end of test piece(in mm) of | Hardness HRC at a distance from quenched end of test piece(in mm) of | Hardness HRC at a distance from quenched end of test piece(in mm) of | Hardness HRC at a distance from quenched end of test piece(in mm) of | Hardness HRC at a distance from quenched end of test piece(in mm) of | Hardness HRC at a distance from quenched end of test piece(in mm) of | Hardness HRC at a distance from quenched end of test piece(in mm) of |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Steel name | Sym- bol | Austenitizing temperature °℃±5℃ | Limits of range | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 13 | 15 | 20 | 25 | 30 |
| C35EC | +H | 870 | max. | 58 | 57 | 55 | 53 | 49 | 41 | 34 | 31 | 28 | 27 | 26 | 25 | 24 | 23 | 20 | — |
| C35EC | +H | 870 | min. | 48 | 40 | 33 | 24 | 22 | 20 | — | — | — | — | — | — | — | — | — | — |