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【Steel Pipe】


　　There are 3 series and lots of specifications products including Φ15mm—Φ300mm welding pipes for low pressure liquid transportation, oil pipes, and square and rectangle structural pipes, which achieved ISO9002 Authentication in 1996.
　　The products are widely used in water, oil, coal gas and natural gas transportation as well as in engineering structure, shipping, coal, chemical and heating power pipe fields.

GB/T 3092－93
Nominal diameter
External diameter
Ordinary steel pipe
Thickening steel pipe
mm
in
Nominal dimensionmm
Allowable variation
Wall thickness
Theoretical weight
Kg/m
Wall thickness
Theoretical weight
Kg/m
Nominal dimensionmm
Allowable variation ％
Nominal dimension
mm
Allowable variation％
15
1/2
21.3
±0.5mm
2.75
+12
-15
1.26
3.25
+12
-15
1.45
20
3/4
26.8
2.75
1.63
3.50
2.01
25
1
33.5
3.25
2.42
4.00
2.91
32
1 1/4
42.3
3.25
3.16
4.00
3.78
40
1 1/2
48.0
3.50
3.84
4.25
4.28
50
2
60
±1%
3.50
4.88
4.50
6.16
65
2 1/2
75.5
3.75
6.64
4.50
7.88
80
3
88.5
4.00
8.34
4.75
9.81
100
4
114.0
4.00
10.35
5.00
13.44
125
5
140.0
4.00
18.42
5.50
18.24
150
6
165.0
4.50
17.81
5.50
21.63

GB/T 14980－94
Nominal diameter D
Wall thickness S（mm）
4.0
4.5
5.0
5.5
6.0
7.0
8.0
10.0
11.0
12.0
（in）
mm
Theoretical quality (weight) kg/m
（6 5/8）
168.3
16.21
18.18
20.13
22.08
24.01
（7）
177.8
17.14
19.23
21.30
23.37
25.42
（7 5/8）
193.7
18.71
20.10
23.27
25.52
27.80
（8 5/8）
219.1
21.22
23.81
26.40
28.97
31.53
36.61
41.63
51.56
（9 5/8）
244.5
28.72
26.63
29.53
32.42
35.29
41.00
46.66
57.83
（10 3/4）
273
33.04
36.28
39.51
45.92
52.28
64.86
（12 3/4）
323.9
39.32
43.19
47.04
54.70
62.32
77.41
84.88
92.30
（14）
355.6
47.48
51.73
60.18
68.57
85.22
93.48
101.7
（16）
406.4
54.37
59.24
68.94
78.59
97.75
107.3
116.7
（18）
457.2
61.26
66.76
77.71
88.62
110.3
121.4
131.7
（20）
508
68.15
74.28
86.48
98.64
122.8
134.8
146.8
　Note: Listed external diameter and wall thickness size can be available

Feeding steel pipe size, weight and test pressure（API 5L〕
Spec.
Theoretical weight
Hydraulic testing pressure MPa
Nominal external diameter
Nominal wall thickness
API 5L
in
mm
mm
Kg/m
A
B
X42
X46
X52
X56
X60
X65
X70
4 1/2
114.3
3.2
3.6
4.0
4.4
4.8
5.2
5.6
6.0
6.4
7.1
7.9
8.6
8.77
9.83
10.88
11.92
12.96
13.99
15.01
16.02
17.03
18.77
20.73
22.42
7.0
7.8
8.7
9.6
10.4
11.3
12.2
13.0
13.9
15.4
17.2
18.7
8.1
9.1
10.1
11.1
12.1
13.2
14.2
15.2
16.2
18.0
19.3
19.3
9.7
11.0
12.2
13.4
14.6
15.8
17.0
18.3
19.5
20.7
20.7
20.7
10.6
12.0
13.3
14.6
16.0
17.3
18.6
20.7
20.7
20.7
20.7
20.7
12.1
13.6
15.1
16.6
18.1
19.6
20.7
20.7
20.7
20.7
20.7
20.7
13.0
14.6
16.2
17.8
19.5
20.7
20.7
20.7
20.7
20.7
20.7
20.7
13.9
15.6
17.4
19.1
20.7
20.7
20.7
20.7
20.7
20.7
20.7
20.7
15.1
16.9
18.8
20.7
20.7
20.7
20.7
20.7
20.7
20.7
20.7
20.7
16.2
18.3
20.3
20.7
20.7
20.7
20.7
20.7
20.7
20.7
20.7
20.7
5 9/16
141.3
3.2
4.0
4.8
5.6
6.6
7.1
7.9
8.7
9.5
10.90
13.54
16.16
18.74
21.92
23.50
25.99
28.45
30.88
5.6
7.0
8.4
9.8
11.6
12.5
13.9
15.3
16.7
6.5
8.2
9.8
11.5
13.5
14.5
16.2
17.8
19.3
7.8
9.7
11.7
13.7
16.1
17.6
20.7
20.7
20.7
8.5
10.7
12.9
15.0
17.7
19.2
20.7
20.7
20.7
9.7
12.1
14.5
17.0
19.9
20.7
20.7
20.7
20.7
10.3
13.2
15.7
18.3
20.7
20.7
20.7
20.7
20.7
11.2
13.9
16.8
19.5
20.7
20.7
20.7
20.7
20.7
12.1
14.6
18.2
20.7
20.7
20.7
20.7
20.7
20.7
13.0
16.3
19.6
20.7
20.7
20.7
20.7
20.7
20.7
6.296
159.0
3.5
4.0
4.5
5.0
5.5
6.0
7.0
8.0
9.0
10.0
13.42
15.29
17.14
18.99
20.82
22.64
26.24
29.79
33.29
36.74
6.8
7.8
8.8
9.8
10.7
11.7
13.7
15.6
17.6
19.3
8.0
9.1
10.2
11.4
12.5
13.6
15.9
18.2
19.3
19.3
9.5
10.9
12.3
13.6
15.0
16.4
19.1
20.7
20.7
20.7
10.5
12.0
13.5
15.0
16.4
17.9
20.7
20.7
20.7
20.7
11.8
13.5
15.2
16.9
18.6
20.3
20.7
20.7
20.7
20.7
12.7
14.6
16.4
18.2
20.0
20.7
20.7
20.7
20.7
20.7
13.6
15.6
17.5
19.5
20.7
20.7
20.7
20.7
20.7
20.7
14.8
16.9
19.0
20.7
20.7
20.7
20.7
20.7
20.7
20.7
15.9
18.2
20.5
20.7
20.7
20.7
20.7
20.7
20.7
20.7
6 5/8
168.3
3.5
4.0
4.5
5.0
5.5
6.0
7.0
8.0
9.0
10.0
14.22
16.21
18.18
20.13
22.08
24.01
27.84
31.62
35.36
39.04
6.5
7.4
8.3
9.2
10.1
11.1
12.9
14.8
16.6
18.4
7.5
8.6
9.7
10.7
11.8
12.9
15.0
17.2
19.3
19.3
9.0
10.3
11.6
12.9
14.2
15.5
18.0
20.6
20.7
20.7
9.9
11.3
12.7
14.1
15.5
17.0
19.8
20.7
20.7
20.7
11.2
12.8
14.4
16.0
17.5
19.1
20.7
20.7
20.7
20.7
12.0
13.8
15.5
17.2
18.9
20.6
20.7
20.7
20.7
20.7
12.9
14.7
16.6
18.4
20.2
20.7
20.7
20.7
20.7
20.7
14.0
16.0
18.0
20.0
20.7
20.7
20.7
20.7
20.7
20.7
15.0
17.2
19.3
20.7
20.7
20.7
20.7
20.7
20.7
20.7
8 5/8
219.1
3.5
4.0
4.5
5.0
5.5
6.0
7.0
8.0
9.0
10.0
18.61
21.22
23.81
26.40
28.97
31.53
36.61
41.45
46.63
51.56
5.0
5.7
6.4
7.1
7.8
8.5
9.9
11.3
12.8
14.2
5.8
6.6
7.4
8.2
9.1
9.9
11.5
13.2
14.8
16.5
6.9
7.9
8.9
9.9
10.9
11.9
13.8
15.8
17.8
19.8
7.6
8.7
9.8
10.9
11.9
13.0
15.2
17.4
19.5
20.7
8.6
9.8
11.0
12.3
13.5
14.7
17.2
19.6
20.7
20.7
9.2
10.6
11.9
13.2
14.5
15.9
18.5
20.7
20.7
20.7
9.9
11.3
12.7
14.1
15.6
17.0
19.8
20.7
20.7
20.7
10.7
12.3
13.8
15.3
16.9
18.4
20.7
20.7
20.7
20.7
11.5
13.2
14.8
16.5
18.1
19.8
20.7
20.7
20.7
20.7
10 3/4
273.1
3.5
4.0
4.5
5.0
5.5
6.0
7.0
8.0
9.0
10.0
23.26
26.53
29.80
33.04
36.28
39.51
45.92
52.28
58.59
64.86
4.0
4.5
5.1
5.7
6.3
6.8
8.0
9.1
10.2
11.4
4.6
5.3
6.0
6.6
7.3
7.9
9.3
10.6
11.9
13.2
6.3
7.2
8.1
9.0
9.9
10.8
12.6
14.4
16.2
18.0
6.9
7.9
8.9
9.9
10.9
11.8
13.8
15.8
17.8
19.7
7.8
8.9
10.0
11.1
12.3
13.4
15.6
17.8
20.1
20.7
8.4
9.6
10.8
12.0
13.2
14.4
16.8
19.2
20.7
20.7
9.0
10.3
11.6
12.9
14.1
15.4
18.0
20.6
20.7
20.7
9.8
11.2
12.6
13.9
15.3
16.7
19.5
20.7
20.7
20.7
10.5
12.0
13.5
15.0
16.5
18.0
20.7
20.7
20.7
20.7
12 3/4
323.9
4.5
5.0
5.5
6.0
7.0
8.0
9.0
10.0
11.0
12.0
35.44
39.32
43.18
47.04
54.70
62.32
69.89
77.41
84.88
92.30
4.3
4.8
5.3
5.8
6.7
7.7
8.6
9.6
10.5
11.5
5.0
5.6
6.1
6.7
7.8
8.9
10.0
11.2
12.3
13.4
6.8
7.6
8.3
9.1
10.6
12.1
13.7
15.2
16.7
18.2
7.5
8.3
9.2
10.0
11.6
13.3
15.0
16.6
18.3
20.0
8.5
9.4
10.3
11.3
13.2
15.0
16.9
18.8
20.7
20.7
9.1
10.1
11.1
12.2
14.2
16.2
18.2
20.3
20.7
20.7
9.8
10.8
11.9
13.0
15.2
17.3
19.5
20.7
20.7
20.7
10.6
11.8
12.9
14.1
16.5
18.8
20.7
20.7
20.7
20.7
11.4
12.6
13.9
15.2
17.7
20.2
20.7
20.7
20.7
20.7

Guangduan steel pipe, size, weight and test pressure
Spec.
Nominal Weight
Weight Class
S.N.
Test pressure (kpa)
Nominal dimension
External diameter(mm)
Wall Thickness (mm)
4
4.500
(114.3)
0.125(3.18)
0.156(3.96)
0.188(4.78)
0.219(5.56)
0.237(6.02)
0.250(6.02)
0.281(7.14)
0.312(7.92)
0.337(8.56)
5.84(8.71)
7.24(10.78)
8.66(12.91)
10.01(14.91)
10.79(16.07)
11.35(16.90)
12.66(18.87)
13.98(20.78)
14.98(22.32)
…
…
…
…
STD
…
…
…
XS

…
…
…
…
40
…
…
…
80
1000(6890)1170(8070)
1250(8620)1460(10070)
1500(10340)1750(12070)
1750(12070)2040(14070)
1900(13100)2210(15240)
2000(13790)2330(16060)
2250(15110)2620(18060)
2500(17240)2800(19310)
2700(18620)2800(19310)
5
5.563
(141.3)
0.156(3.96)
0.188(4.78)
0.219(5.56)
0.258(6.55)
0.281(7.14)
0.312(7.92)
0.344(8.74)
0.375(9.52)
9.01(13.41)
10.79(16.09)
12.50(18.61)
14.62(21.77)
15.85(23.62)
17.50(26.05)
19.17(28.57)
20.78(30.94)
…
…
…
STD
…
…
…
XS
…
…
…
…
40
…
…
…
80
1010(6960) 1180(8140)
1220(8410) 1420(9790)
1420(9790) 1650(11380)
1670(11510) 1950(13440)
1820(12550) 2120(14620)
2020(13930) 2360(16270)
2230(15380) 2600(17930)
2430(16750) 2800(19310)
6
6.625
(168.3
0.188(4.78)
0.219(5.56)
0.250(6.35)
0.280(7.11)
0.312(7.92)
0.344(8.74)
0.375(9.52)
0.432(10.97)
12.92(19.27)
14.98(22.31)
17.02(25.36)
18.97(28.26)
21.04(31.32)
23.08(34.39)
25.03(37.28)
28.57(42.56)
…
…
…
STD
…
…
…
XS
…
…
…
…
40
…
…
…
80
1020(7030) 1190(8200)
1190(8200) 1390(9580)
1360(93801 1580(10890)
1520(10480) 1780(12270)
1700(11720) 1980(13650)
1870(12890) 2180(15030)
2040(14070) 2380(16410)
2350(16200) 2740(18890)
8
8.625
(219.1)
0.188(4.78)
0.203(5.16)
0.219(5.56)
0.250(6.35)
0.277(7.04)
0.312(7.92)
0.322(8.18)
0.344(8.74)
0.375(9.52)
0.406(10.31)
16.94(25.26)
18.26(27.22)
19.66(29.28)
22.36(33.31)
24.70(36.31)
27.70(41.24)
28.55(42.55)
30.42(45.34)
33.04(49.20)
35.64(53.08)
…
…
…
…
…
…
STD
…
…
…
…
…
…
20
30
…
40
…
…
60
780(5380) 920(6340)
850(5860) 1000(6890)
910(6270) 1070(7380)
1040(7170) 1220(8410)
1160(7800) 1350(9310)
1300(8960) 1520(10480)
1340(9240) 1570(10820)
1440(9930) 1680(11580)
1570(10820) 1930(12620)
1700(1172) 2000(13790)
10
10.750
(273.0)
0.188(4.78)
0.203(5.16)
0.219(5.56)
0.250(6.35)
0.279(7.09)
0.307(7.80)
0.344(8.74)
0.365(9.27)
21.21(31.62)
22.87(34.08)
24.63(36.67)
28.04(41.75)
31.20(46.49)
34.24(51.01)
38.23(56.96)
40.48(60.29)
…
…
…
…
…
…
…
STD
…
…
…
20
…
30
…
40

630(4340) 730(5030)
680(4690) 800(5520)
730(5030) 860(5930)
840(5790) 980(6760)
930(6410) 1090(7520)
1030(7100) 1200(8270)
1150(7930) 1340(9240)
1200(8410) 1430(9860)
12
12.750
(323.8)
0.203(5.16)
0.219(5.56)
0.250(6.35)
0.281(7.14)
0.312(7.92)
0.330(8.38)
0.344(8.74)
0.375(9.52)
0.460(10.31)
27.20(40.55)
29.31(43.36)
33.38(49.71)
37.42(55.75)
41.45(61.69)
43.77(65.18)
45.58(67.90)
49.56(73.78)
53.52(79.70)
…
…
…
…
…
…
…
STD
…
…
…
…
20
…
…
30
…
…
40

570(3930) 670(4620)
620(4270) 720(4960)
710(4900) 820(5650)
790(5450) 930(6410)
880(6070) 1030(7100)
930(6410) 1090(7520)
970(6690) 1130(7790)
1060(7310) 1240(8550)
1150(7930) 1340(9240)

Square hollow steel size and main parameter GB6728－86，ASTM A500
Length
mm
Allowable variation
mm
Wall Thickness
mm

Theoretical weight
Kg/m

Section Area
cm2
Moment of inertia
cm4
Turn R cm
Section Modulus cm3
Torsion constant
A
ordinary precision
Higher precision
Ix=Iy
Rx=Ry
Wx=Wy
Ity cm2
Wty cm2
25
±0.60
±0.30
1.2
0.867
1.105
1.025
0.963
0.820
1.655
1.352
1.5
1.061
1.352
1.216
0.948
0.973
1.998
1.643
2.0
1.363
1.736
1.482
0.923
1.186
2.502
2.085
30
2.5
2.032
2.589
3.154
1.103
2.102
5.347
3.720
3.0
2.361
3.008
3.500
1.078
2.333
6.060
4.269
40
±0.80
±0.40
2.5
2.817
3.589
8.213
1.512
4.106
13.539
6.970
3.0
3.303
4.208
9.320
1.488
4.660
15.628
8.109
4.0
4.198
5.347
11.064
1.438
5.532
19.152
10.120
50

±1.00
±0.50
2.5
3.602
4.589
16.941
1.921
6.776
27.436
11.220
3.0
4.245
5.408
19.463
1.897
7.785
31.972
13.149
4.0
5.454
6.947
23.725
1.847
9.490
40.047
16.680
60
±1.20
±0.60
2.5
4.387
5.589
30.340
2.329
10.113
48.539
16.470
3.0
5.187
6.608
35.130
2.305
11.710
56.892
19.389
4.0
6.710
8.547
43.539
2.256
14.513
72.188
24.840
5.0
8.129
10.356
50.468
2.207
16.822
85.560
29.767
70
3.0
6.129
7.808
57.522
2.714
16.434
92.188
26.829
4.0
7.966
10.147
72.108
2.665
20.602
117.975
34.600
5.0
9.699
12.356
84.602
2.616
24.172
141.183
41.767
80

±1.40
3.0
7.071
9.008
87.838
3.122
21.959
139.660
35.469
4.0
9.222
11.747
111.031
3.074
27.757
179.808
45.960
5.0
11.269
14.356
131.414
3.025
32.853
216.628
55.767
90
±1.50
±0.75
3.0
8.013
10.208
127.277
3.531
28.283
201.108
45.309
4.0
10.478
13.347
161.907
3.482
35.979
260.088
58.920
5.0
12.839
16.356
192.903
3.434
42.867
314.896
71.767
6.0
15.097
19.232
220.420
3.385
48.982
365.452
83.837
100
±1.60
±0.80
4.0
11.734
14.947
226.337
3.891
45.267
361.213
73.480
5.0
14.409
18.356
271.071
3.842
54.214
438.986
89.767
6.0
16.981
21.632
311.415
3.794
62.283
511.558
105.197
120
±1.80
±0.90
4.0
14.246
18.147
402.260
4.708
67.043
635.603
107.400
5.0
17.549
22.356
485.441
4.659
80.906
776.632
131.767
6.0
20.749
26.432
562.094
4.611
93.683
910.281
155.117
8.0
26.840
34.191
696.637
4.513
116.106
1155.010
198.726
140
±2.00
±1.00
4.0
16.758
21.347
651.598
5.524
93.085
1022.176
147.720
5.0
20.689
26.356
790.523
5.476
112.931
1253.565
181.76
6.0
24.517
31.232
920.359
5.428
131.479
1475.020
214.637
8.0
31.864
40.591
1153.735
5.331
164.819
1887.605
276.806
160
±2.40
±1.20
4.0
19.270
24.547
987.152
6.341
123.394
1540.134
194.440
5.0
23.829
30.356
1202.317
6.293
150.289
1893.787
239.767
6.0
28.285
38.032
1405.408
6.245
175.676
2234.573
283.757
8.0
36.888
46.991
1776.496
6.148
222.062
2876.940
367.686

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