20#45#精密無縫鋼管力學性能
鋼種 | 力學性能 | 冷拔(軋)管 | 金切管 |
20# | 抗拉強度σbN/mm2 伸長率δ5% | ≥510 | ≥390 |
≥5 | ≥20 | ||
45# | ≥647 | ≥590 | |
≥4 | ≥4 |
加工形式 | 缸徑 | 長度 | 直線度 | 尺寸精度 | 內孔粗糙度 |
冷軋 | 30-100 | ≤12M | 0.3-1.0 | H8-H10 | 0.4-1.6 |
冷拔 | 30-250 | ≤12M | H8-H10 | 0.8-1.6 | |
珩磨 | 40-500 | ≤12M | 1000 | H8-H9 | 0.4-0.8 |
滾壓 | 40-400 | ≤7M | H8 | 0.4 |
尺寸公差
尺寸公差(壁厚偏差±5%) | |||
內徑尺寸 | H8 | H9 | H10 |
30 | +0.033 0 | +0.052 0 | +0.084 0 |
＞30-50 | +0.039 0 | +0.062 0 | +0.100 0 |
＞50-80 | +0.046 0 | +0.074 0 | +0.120 0 |
＞80-120 | +0.054 0 | +0.087 0 | +0.140 0 |
＞120-180 | +0.063 0 | +0.100 0 | +0.160 0 |
＞180-250 | +0.072 0 | +0.115 0 | +0.185 0 |
＞250-315 | +0.081 0 | +0.130 0 | +0.210 0 |
＞315-400 | +0.089 0 | +0.140 0 | +0.230 0 |