20#45#精密無縫鋼管力學(xué)性能
鋼種 |
力學(xué)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(nèi)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(nèi)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 |
