钢管种类 | 钢管尺寸 | 允许偏差 | |
汽车半轴套管用无缝钢管 | 外径 | 76~122 | ± 1% |
内径 | 57~102 | ± 1.75% | |
壁厚S | 7~15 | +12.5%S,-9%S | |
>15 | +12.5%S,-7.5%S |
牌 号 | 力学性能 | 硬度 | |||
抗拉强度(Mpa) | 屈服强度(Mpa) | 伸长率(%) | HBW | 压痕直径/MM | |
45 | ≥590 | ≥335 | ≥14 | - | - |
45Mn2 | - | - | - | 217~269 | 4.1~3.7 |
40Cr | - | - | - | 217~269 | 4.1~3.7 |
20CrNi3A | - | - | - | 217~269 | 4.1~3.7 |
牌 号 | C | Si | Mn | P | S | Cr | Ni | Cu |
45 | 0.42~0.50 | 0.17~0.37 | 0.50~0.80 | ≤0.040 | ≤0.040 | ≤0.25 | ≤0.25 | ≤0.20 |
45Mn2 | 0.42~0.49 | 0.20~0.40 | 1.40~1.80 | ≤0.040 | ≤0.040 | ≤0.35 | ≤0.35 | ≤0.30 |
40Cr | 0.37~0.45 | 0.20~0.40 | 0.50~0.80 | ≤0.040 | ≤0.040 | 0.80~1.10 | ≤0.35 | ≤0.30 |
20CrNi3A | 0.17~0.24 | 0.20~0.40 | 0.30~0.60 | ≤0.035 | ≤0.030 | 0.60~0.90 | 2.75~3.25 | ≤0.25 |