|
A 系列为国际通用系列（俗称英制管）
B 系列为国内沿用系列（俗称公制管） (mm)
|
公称直径
|
钢管外径
|
|
A系列（英制管）
|
B系列（公制管）
|
|
DN10
|
17.2
|
14
|
|
DN 15
|
21.3
|
18
|
|
DN 20
|
26.9
|
25
|
|
DN 25
|
33.7
|
32
|
|
DN 32
|
42.4
|
38
|
|
DN 40
|
48.3
|
45
|
|
DN 50
|
60.3
|
57
|
|
DN 65
|
76.1
|
76
|
|
DN 80
|
88.9
|
89
|
|
DN 100
|
114.3
|
108
|
|
DN 125
|
139.7
|
133
|
|
DN 150
|
168.3
|
159
|
|
DN 200
|
219.1
|
219
|
|
DN 250
|
273
|
273
|
|
DN 300
|
323.9
|
325
|
|
DN 350
|
355.6
|
377
|
|
DN 400
|
406.4
|
426
|
|
DN 450
|
457
|
480
|
|
DN 500
|
508
|
530
|
|
DN 600
|
610
|
630
|
|
DN 700
|
711
|
720
|
|
DN 800
|
813
|
820
|
|
DN 900
|
914
|
920
|
|
DN 1000
|
1016
|
1020
|
|
DN 1200
|
1219
|
1220
|
|
DN 1400
|
1422
|
1420
|
|
DN 1600
|
1626
|
1620
|
|
DN 1800
|
1829
|
1820
|
|
DN 2000
|
2032
|
2020
|
|
公称直径
|
钢管外径
|
|
NPS（in）
|
DN
|
|
1/2
|
15
|
21.3
|
|
3/4
|
20
|
26.9
|
|
1
|
25
|
33.7
|
|
1 1/4
|
32
|
42.4
|
|
1 1/2
|
40
|
48.3
|
|
2
|
50
|
60.3
|
|
2 1/2
|
65
|
76.1
|
|
3
|
80
|
88.9
|
|
4
|
100
|
114.3
|
|
5
|
125
|
139.7
|
|
6
|
150
|
168.3
|
|
8
|
200
|
219.1
|
|
10
|
250
|
273.0
|
|
12
|
300
|
323.9
|
|
14
|
350
|
355.6
|
|
16
|
400
|
406.4
|
|
18
|
450
|
457
|
|
20
|
500
|
508
|
|
22
|
550
|
559
|
|
24
|
600
|
610
|
|
26
|
650
|
660
|
|
28
|
700
|
711
|
|
30
|
750
|
760
|
|
32
|
800
|
813
|
|
34
|
850
|
864
|
|
36
|
900
|
914
|
|
38
|
950
|
965
|
|
40
|
1000
|
1016
|
|
42
|
1050
|
1067
|
|
44
|
1100
|
1118
|
|
46
|
1150
|
1168
|
|
48
|
1200
|
1219
|
|
50
|
1250
|
1270
|
|
52
|
1300
|
1321
|
|
54
|
1350
|
1372
|
|
56
|
1400
|
1422
|
|
58
|
1450
|
1473
|
|
60
|
1500
|
1524
|
|
