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中国国家标准(GB/T3092-93 GB/T3091-93)焊接钢管、镀锌钢管
|
公称口径
|
外径(mm)
|
壁厚(mm)
|
重量
(kg/m)
|
|
mm
|
In
|
公称尺寸
|
允许偏差
|
公称尺寸
|
允许偏差
|
|
15
|
1/2
|
21.3
|
±1%
|
2.75
|
±12%
-15%
|
1.26
|
|
20
|
3/4
|
26.8
|
2.75
|
1.63
|
|
25
|
1
|
33.5
|
3.25
|
2.42
|
|
32
|
1-1/4
|
42.3
|
3.25
|
3.13
|
|
40
|
1-1/2
|
48
|
3.5
|
3.83
|
|
50
|
2
|
60
|
3.5
|
4.88
|
|
65
|
2-1/2
|
75.5
|
3.75
|
6.64
|
|
80
|
3
|
88.5
|
4
|
8.34
|
|
100
|
4
|
114.0
|
4
|
10.85
|
|
125
|
5
|
140.0
|
4
|
13.42
|
|
150
|
6
|
165.0
|
4.5
|
17.81
|
|