|
铸铁铸铁精密中空锚杆力学性能 | |||
|
钢种 |
力学性能 |
冷拔（轧）管 |
金切管 |
|
20# |
抗拉强度σbN/mm2
伸长率δ5% |
≥510 |
≥390 |
|
≥5 |
≥20 | ||
|
铸铁 |
≥647 |
≥590 | |
|
≥4 |
≥4 | ||
|
加工形式 |
缸径 |
长度 |
直线度 |
尺寸精度 |
内孔粗糙度 |
|
冷轧 |
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 |
|
滚压 |
40-400 |
≤7M |
H8 |
0.4 |
|
尺寸公差（壁厚偏差±5%） | |||
|
内径尺寸 |
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 |