Definition: welded steel pipe is also called welded pipe which is steel pipe formed by welding the curled steel plates or strip steel, with general fixed length of 6m.
Production process: raw material uncoiling – flattening – end cutting and welding – looping – molding – welding – internal/external removal of welding beads – precorrection – inductive heat treatment – sizing and straightening – eddy current testing – cutting – water pressure inspection – acid pickling – final inspection (strict control) – packing – delivery
Category:
Production methods:
a. Process – electric arc-welded pipes, resistance welded pipe (high frequency, low frequency), gas-welded pipes, furnace butt-welded pipes
b. Welding seam – straight welded pipes, spiral welded pipes
Wall Thickness
Thin-wall steel pipes, thick-wall steel pipes
End Shape
Circular welded pipes and specially-shaped (square, flat, etc.) welded pipes
Length: 6m (capable of being customized and processed according to customer requirements)
Packing: bundling, nude packing, or packing according to customer requirements
Carbon Steel Straight Welded Pipes
Weight (kg) per meter
Note: d (outer diameter); t (wall thickness)
Features:
Straight welded pipes feature simple production process, high production efficiency, low cost and high development speed.
The intensity of spiral welded pipes is generally higher than that of straight welded pipes; welded pipes with larger pipe diameters can be produced by relatively narrow blanks; welded pipes with different pipe diameters can be produced blanks with the same width. However, spiral welded pipes have the length increase of 30~100%, as well as lower production speed compared with straight welded pipes with the same length.
Nominal size GB thickness mm
|
Size
|
OD
|
National
thickness
|
Welded pipe theory
weight gauge
|
|
4inch
|
15
|
1/2inch
|
21.25
|
2.75
|
1.26
|
|
6inch
|
20
|
3/4inch
|
26.75
|
2.75
|
1.63
|
|
1inch
|
25
|
1inch
|
33.3
|
3.25
|
2.42
|
|
1.2inch
|
32
|
11/4inch
|
42.25
|
3.25
|
3.13
|
|
1.5inch
|
40
|
11/2inch
|
48
|
3.5
|
3.84
|
|
2inch
|
50
|
2inch
|
60
|
3.5
|
4.88
|
|
2.5inch
|
70
|
21/2inch
|
75.5
|
3.75
|
6.64
|
|
3inch
|
80
|
3inch
|
88.5
|
4.0
|
8.34
|
|
4inch
|
100
|
4inch
|
114
|
4.0
|
10.85
|
|
5inch
|
125
|
5inch
|
140
|
4.5
|
15.04
|
|
6inch
|
150
|
6inch
|
165
|
4.5
|
17.81
|
|
8inch
|
200
|
8inch
|
219
|
6
|
31.52
|
Spiral welded pipe gauge
|
Specification
|
Thickness
|
Kg/m
|
GB
pressure value
|
Department of
hydraulic pressure
|
Specification
|
Thickness
|
Kg/m
|
GB
pressure value |
Department of
hydraulic pressure |
|
219
|
6
|
32.02
|
9.7
|
7.7
|
720
|
6
|
106.15
|
3
|
2.3
|
|
|
7
|
37.1
|
11.3
|
9
|
|
7
|
123.59
|
3.5
|
2.7
|
|
|
8
|
42.13
|
12.9
|
10.3
|
|
8
|
140.97
|
4
|
3.1
|
|
273
|
6
|
40.01
|
7.7
|
6.2
|
|
9
|
158.31
|
4.5
|
3.5
|
|
|
7
|
46.42
|
9
|
7.2
|
|
10
|
175.6
|
5
|
3.9
|
|
|
8
|
52.78
|
10.3
|
8.3
|
|
12
|
210.02
|
6
|
4.7
|
|
325
|
6
|
47.7
|
6.5
|
5.2
|
820
|
7
|
140.85
|
3.1
|
2.4
|
|
|
7
|
55.4
|
7.6
|
6.1
|
|
8
|
160.7
|
3.5
|
2.7
|
|
|
8
|
63.04
|
8.7
|
6.9
|
|
9
|
180.5
|
4
|
3.1
|
|
377
|
6
|
55.4
|
5.7
|
4.5
|
|
10
|
200.26
|
4.4
|
3.4
|
|
|
7
|
64.37
|
6.7
|
5.2
|
|
11
|
219.96
|
4.8
|
3.8
|
|
|
8
|
73.3
|
7.6
|
6
|
|
12
|
239.62
|
5.3
|
4.1
|
|
|
9
|
82.18
|
8.6
|
6.8
|
920
|
8
|
180.43
|
3.1
|
2.5
|
|
|
10
|
91.01
|
-
|
7.5
|
|
9
|
202.7
|
3.5
|
2.8
|
|
426
|
6
|
62.25
|
5.1
|
4
|
|
10
|
224.92
|
3.9
|
3.1
|
|
|
7
|
72.83
|
5.9
|
4.6
|
|
11
|
247.22
|
4.3
|
3.4
|
|
|
8
|
82.97
|
6.8
|
5.3
|
|
12
|
269.21
|
4.7
|
3.7
|
|
|
9
|
93.05
|
7.6
|
6
|
1020
|
8
|
200.16
|
2.8
|
2.2
|
|
|
10
|
103.09
|
8.5
|
6.7
|
|
9
|
224.89
|
3.2
|
2.5
|
|
478
|
6
|
70.34
|
4.5
|
3.5
|
|
10
|
249.58
|
3.5
|
2.8
|
|
|
7
|
81.81
|
5.3
|
4.1
|
|
11
|
274.22
|
3.9
|
3
|
|
|
8
|
93.23
|
6
|
4.7
|
|
12
|
298.81
|
4.2
|
3.3
|
|
|
9
|
104.6
|
6.8
|
5.3
|
1220
|
8
|
239.62
|
-
|
1.8
|
|
|
10
|
115.92
|
7.5
|
5.9
|
|
10
|
298.9
|
3
|
2.3
|
|
529
|
6
|
77.89
|
4.1
|
3.2
|
|
11
|
328.47
|
3.2
|
2.5
|
|
|
7
|
90.61
|
4.8
|
3.7
|
|
12
|
357.99
|
3.5
|
2.8
|
|
|
8
|
103.29
|
5.4
|
4.3
|
|
13
|
387.46
|
3.8
|
3
|
|
|
9
|
115.92
|
6.1
|
4.8
|
1420
|
10
|
348.23
|
2.8
|
2
|
|
|
10
|
128.49
|
6.8
|
5.3
|
|
14
|
417.18
|
3.2
|
2.4
|
|
630
|
6
|
92.83
|
3.4
|
2.6
|
1620
|
12
|
476.37
|
2.9
|
2.1
|
|
|
7
|
108.05
|
4
|
3.1
|
|
14
|
554.99
|
3.2
|
2.4
|
|
|
8
|
123.22
|
4.6
|
3.6
|
1820
|
14
|
627.04
|
3.3
|
2.2
|
|
|
9
|
138.33
|
5.1
|
4
|
2020
|
14
|
693.09
|
-
|
2
|
|
|
10
|
153.4
|
5.7
|
4.5
|
2220
|
14
|
762.15
|
-
|
1.8
|
Applications: the product is widely applied to water supply engineering, petrochemical industry, chemical industry, electric power industry, agricultural irrigation and urban construction, and is used for liquid conveying (water supply, water drainage), gas conveying (gas, steam, liquefied petroleum gas), structural use (piling pipes, bridges), pipes for wharfs, roads and architectural structures, etc.
