Welded steel pipe is created using a flat steel plates or steel strips, and its manufacturing process creates seams in its body. Specifically, when welded steel pipes are manufactured, a steel plate or strip is bent and subsequently welded into either a circular, traditional pipe shape or a square shape.LSAW pipe, SSAW pipe and ERW pipe are all welded steel pipes and are classified based on the method of welding. For instance, LSAW pipe is welded longitudinally, and SSAW pipe is spiral-welded. ERW pipe is electric resistance welded, which results in a seam that runs parallel along the pipe body.
▇▍ERW Steel Pipe
High-frequency welded pipes are generally straight-slit, but straight-slit welded steel pipes are not necessarily high-frequency welded. The high-frequency straight-slit electric resistance welded steel pipe is formed by the skin effect and the proximity effect of the high-frequency current after the hot-rolled coil plate is formed by the molding machine, and the edge of the tube blank is heated and melted, and pressure welding is performed under the action of the pressing roller to realize the production. The high-frequency resistance welded steel pipe is different from the ordinary welded pipe welding process. The weld is made of the base material of the steel strip body, and the mechanical strength is better than that of the general welded pipe. The surface is smooth, high precision, low cost, and has low weld seam height, which is beneficial to the coating of 3PE anti-corrosion coating.
Used for Oil/Gas/Water transmission,Machinery Manufacturing
Size:
OD: 21.3-660mm
WT: 1.0-20mm
LENGTH: 5.8/6/11.8/12m
Pipe Standard:
API 5L PSL1/PSL2 Gr.A,Gr.B,X42,X46,X52,X56,X60,X65,X70
ASTM A53/A252/A500/A178/A135
EN10210/EN10219/EN10217/EN10208/EN10297
JIS G3441/G3444/G3445/G3452/G3454/G3456
BS1387/AS1163
▇▍LSAW Steel Pipe
Longitudinal submerged arc welded is produced by using a single medium and thick plate as the raw material, pressing (rolling) the steel plate in a mold or forming machine into a tube blank, using double-sided submerged arc welding, and expanding the diameter. The steel plate feed amount can be automatically adjusted according to different steel grades, wall thicknesses, and plate widths. At the same time, the deformation compensation function effectively avoids the adverse effects of mold deformation on the forming and ensures the flatness of the full length of the steel plate during the pressing process. The feeding step is uniform during forming, ensuring the roundness of the tube blank and the flatness of the welding edge. The finished product has a wide range of specifications, and the weld has good toughness, plasticity, uniformity, and compactness. It has the advantages of large pipe diameter, pipe wall thickness, high-pressure resistance, low-temperature resistance, and strong corrosion resistance.
Product:
LSAW pipe,EFW Pipe
Application:
Used for oil/gas/water Transmission,Engineering/Offshore projects.
Size:
OD: 219mm-1625mm
WT: 7-50mm
LENGTH: 5.8/6/11.8/12m
Pipe Standard:
API 5L PSL1/PSL2 Gr.A,Gr.B,X42,X46,X52,X56,X60,X65,X70
ASTM A53/A252/A500/A672/A691/A139
EN10210/EN10219/EN10217/EN10208/EN10297
AS1163/JIS G3457
▇▍SSAW Steel Pipe
Spiral welded pipe(SSAW pipe, also called HSAW pipe). The pipe is formed by spiral submerged arc welding technology. Spiral welded pipes are formed using narrower plates or hot rolled coils, which lowers their production costs significantly. The welding line shape like a helix. The spiral welding process permits the production of large-diameter pipes suitable for transporting large volumes of oil and gas. Some SSAW pipes were historically limited to low-pressure applications.
Product:
SSAW Pipe, SAWH Pipe, Spiral Steel Pipe
Application:
Used for Oil/Gas/Water transmission,Construction & Structure Parts
Size:
OD: 219mm-4064mm
WT: 3.2-40mm
LENGTH: 5.8/6/11.8/12m
Pipe Standard:
API 5L PSL1/PSL2 Gr.A,Gr.B,X42,X46,X52,X56,X60,X65,X70
ASTM A53/A252/A500
EN10219/EN10208/EN10297
JIS G3457
Product Specification And Size
Product Name
Executive Standard
Dimension (mm)
Steel Code / Steel Grade
Casting
API 5CT
Ø48.3~273 x WT2.77~11.43
J55, K55, N80, L80
Tubing
API 5CT
Ø48.3~273 x WT2.77~11.43
J55, K55, N80, L80, H40
Line Pipes
API 5L
Ø60.3~273.1 x WT2.77~12.7
A25, A, B, X42, X46, X52, X56, X60, X65, X70, X80
Electric-Resistance-Welded Steel Pipes
ASTM A135
Ø42.2~114.3 x WT2.11~2.63
A
ERW and Hot-dip Galvanized Steel Pipes
ASTM A53
Ø21.3~273 x WT2.11~12.7
A, B
Pipes for Piling Usage
ASTM A252
Ø219.1~508 x WT3.6~12.7
Gr.2, Gr.3
Tubes for General Structural Purpose
ASTM A500
Ø21.3~273 x WT2.11~12.7
Gr.2, Gr.3
Square Pipes for General Structural Purpose
ASTM A500
25 x 25~160 x 160 x WT1.2~8.0
Carbon Steel
Threaded Steel Pipes
DIN 2440
Ø21~164 x WT2.65~4.85
Carbon Steel
Screwed and Socketed Steel Tubes
BS 1387
Ø21.4~113.9 x WT2~3.6
Carbon Steel
Scaffolding Pipes
EN 39
Ø48.3 x WT3.2~4
Carbon Steel
Carbon Steel Tubes for General Structure Purpose
JIS G3444
Ø21.7~216.3 x WT2.0~6.0
Carbon Steel
Carbon Steel Tubes for Machine Structure Purpose
JIS G3445
Ø15~76 x WT0.7~3.0
STKM11A, STKM13A
Carbon Steel Pipes for Ordinary Piping
JIS G3452
Ø21.9~216.3 x WT2.8~5.8
Carbon Steel
Carbon Steel Pipes for Pressure Service
JIS G3454
Ø21.7~216.3 x WT2.8~7.1
Carbon Steel
Carbon Steel Rigid Steel Conduits
JIS G8305
Ø21~113.4 x WT1.2~3.5
G16~G104, C19~C75, E19~E75
Carbon Steel Rectangular Pipes for General Structure
JIS G3466
16 x 16~150 x 150 x WT0.7~6
Carbon Steel
Chemical Composition and Mechanical Properties of LSAW Steel Pipe
Standard
Grade
Chemical Composition(max)%
Mechanical Properties(min)
C
Mn
Si
S
P
Yield Strength(Mpa)
Tensile Strength(Mpa)
GB/T700-2006
A
0.22
1.4
0.35
0.050
0.045
235
370
B
0.2
1.4
0.35
0.045
0.045
235
370
C
0.17
1.4
0.35
0.040
0.040
235
370
D
0.17
1.4
0.35
0.035
0.035
235
370
GB/T1591-2009
A
0.2
1.7
0.5
0.035
0.035
345
470
B
0.2
1.7
0.5
0.030
0.030
345
470
C
0.2
1.7
0.5
0.030
0.030
345
470
BS En10025
S235JR
0.17
1.4
-
0.035
0.035
235
360
S275JR
0.21
1.5
-
0.035
0.035
275
410
S355JR
0.24
1.6
-
0.035
0.035
355
470
DIN 17100
ST37-2
0.2
-
-
0.050
0.050
225
340
ST44-2
0.21
-
-
0.050
0.050
265
410
ST52-3
0.2
1.6
0.55
0.040
0.040
345
490
JIS G3101
SS400
-
-
-
0.050
0.050
235
400
SS490
-
-
-
0.050
0.050
275
490
API 5L PSL1
A
0.22
0.9
-
0.03
0.03
210
335
B
0.26
1.2
-
0.03
0.03
245
415
X42
0.26
1.3
-
0.03
0.03
290
415
X46
0.26
1.4
-
0.03
0.03
320
435
X52
0.26
1.4
-
0.03
0.03
360
460
X56
0.26
1.1
-
0.03
0.03
390
490
X60
0.26
1.4
-
0.03
0.03
415
520
X65
0.26
1.45
-
0.03
0.03
450
535
X70
0.26
1.65
-
0.03
0.03
585
570
▇▍ Dimension of Welded Steel Pipe
Dimension of ERW Steel Pipe
Dimension of LSAW Steel Pipe
Dimension of SSAW Steel Pipe
▇▍Application of Welded Steel Pipe
Welded steel pipes are commonly used in a wide range of applications and industries, including:
1）Water and wastewater transportation: Welded steel pipes are used to carry water, sewage, and other fluids in municipal and industrial plumbing systems.
2）Oil and gas pipelines: Welded steel pipes are utilized in the construction of pipelines for the transportation of oil, natural gas, and other hydrocarbons.
3）Structural applications: They are used in the construction of buildings, bridges, and other structures as structural support elements.
4）Automotive and transportation: Welded steel pipes are used in the manufacturing of automobile exhaust systems and chassis components.
5）Manufacturing and industrial processes: They are used in various manufacturing and industrial applications, including conveying materials and gases within factories.
6）Agriculture: Welded steel pipes are used for irrigation systems, drainage, and other agricultural applications.
Hunan Great Steel Pipe Co.,Ltd is a world-class production and service provider of submerged arc straight seam welded pipe as the first subsidiary of Shinestar Group. Hunan Great Steel Pipe Co.,Ltd pays more attention to in the pipeline engineering research areas as a pioneer of China Petroleum Pipeline & Gas Pipeline Science Research Institute.
