|
鋼管的內徑及其允許偏差 |
鋼管的壁厚及其允許偏差 | ||||
|
外徑／mm |
壁厚／mm |
內徑及其允許偏差／mm |
類別 |
壁厚／mm |
允許偏差／mm |
|
50
63.5 |
2.5
1.6 |
45±0.12
60.30±0.14 |
I |
1
<3.0 |
+0.20
-0.10 |
|
63.5
68.9 |
2.5
2.3 |
58.50±0.14
64.30±0.20 |
>3.0-4.0 |
+0.25
-0.15 | |
|
76
89 |
2.5
2.5 |
7l±0.20
84±0.25 |
>4.0 |
±0.25 | |
|
89
89 |
4.0
5.0 |
8l±0.25
79±0.30 |
Ⅱ |
1.6-3.6 |
±0.12 |
|
100
100 |
4.0
6.0 |
92±0.30
88±0.35 |
Ⅲ | ||