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SSAW steel pipes, also known as spiral submerged arc welded pipes, are manufactured by spirally bending hot-rolled strip steel. The spiral seam steel pipe (commonly referred to as spiral welded pipe or spiral steel pipe) is produced through automatic submerged arc welding on both the inner and outer surfaces of the pipe, resulting in a weld seam shaped like a helix.
SSAW pipes utilize the same submerged arc welding technology as LSAW (longitudinal submerged arc welded) pipes. The key difference between the two lies in the welding pattern: SSAW pipes have a spiral weld, whereas LSAW pipes are welded longitudinally along the pipe's length. During the SSAW manufacturing process, the steel strip is rolled at an angle to the pipe's centerline, which forms the spiral seam during welding.
This article provides a brief introduction to SSAW steel pipes, their formation process, and their distinctive welding technology.
Chemical Analysis and Mechanical Properties of SSAW Steel Pipe
The raw material of the SSAW steel pipe includes steel coil, welding wire, flux. All of raw materials must be through strict physical and chemical maintenance before the investment. |
||||||||
Standard |
Grade |
Chemical Composition(max)% |
Mechanical Properties(min) |
|||||
C |
Si |
Mn |
P |
S |
Tensile Strength(Mpa) |
Yield Strength(Mpa) |
||
API 5CT |
h40 |
– |
– |
– |
– |
0.03 |
417 |
417 |
J55 |
– |
– |
– |
– |
0.03 |
517 |
517 |
|
K55 |
– |
– |
– |
– |
0.3 |
655 |
655 |
|
API 5L PSL1 |
A |
0.22 |
– |
0.9 |
0.03 |
0.03 |
335 |
335 |
B |
0.26 |
– |
1.2 |
0.03 |
0.03 |
415 |
415 |
|
X42 |
0.26 |
– |
1.3 |
0.03 |
0.03 |
415 |
415 |
|
X46 |
0.26 |
– |
1.4 |
0.03 |
0.03 |
435 |
435 |
|
X52 |
0.26 |
– |
1.4 |
0.03 |
0.03 |
460 |
460 |
|
X56 |
0.26 |
– |
1.4 |
0.03 |
0.03 |
490 |
490 |
|
X60 |
0.26 |
– |
1.4 |
0.03 |
0.03 |
520 |
520 |
|
X65 |
0.26 |
– |
1.45 |
0.03 |
0.03 |
535 |
535 |
|
X70 |
0.26 |
– |
1.65 |
0.03 |
0.03 |
570 |
570 |
|
API 5L PSL2 |
B |
0.22 |
0.45 |
1.2 |
0.025 |
0.015 |
415 |
415 |
X42 |
0.22 |
0.45 |
1.3 |
0.025 |
0.015 |
415 |
415 |
|
X46 |
0.22 |
0.45 |
1.4 |
0.025 |
0.015 |
435 |
435 |
|
X52 |
0.22 |
0.45 |
1.4 |
0.025 |
0.015 |
460 |
460 |
|
X56 |
0.22 |
0.45 |
1.4 |
0.025 |
0.015 |
490 |
490 |
|
X60 |
0.12 |
0.45 |
1.6 |
0.025 |
0.015 |
520 |
520 |
|
X65 |
0.12 |
0.45 |
1.6 |
0.025 |
0.015 |
535 |
535 |
|
X70 |
0.12 |
0.45 |
1.7 |
0.025 |
0.015 |
570 |
570 |
|
X80 |
0.12 |
0.45 |
1.85 |
0.025 |
0.015 |
625 |
625 |
|
ASTM A53 |
A |
0.25 |
0.1 |
0.95 |
0.05 |
0.045 |
330 |
330 |
B |
0.3 |
0.1 |
1.2 |
0.05 |
0.045 |
415 |
415 |
|
ASTM A252 |
1 |
– |
– |
– |
0.05 |
– |
345 |
345 |
2 |
– |
– |
– |
0.05 |
– |
414 |
414 |
|
3 |
– |
– |
– |
0.05 |
– |
455 |
455 |
|
EN10217-1 |
P195TR1 |
0.13 |
0.35 |
0.7 |
0.025 |
0.02 |
320 |
320 |
P195TR2 |
0.13 |
0.35 |
0.7 |
0.025 |
0.02 |
320 |
320 |
|
P235TR1 |
0.16 |
0.35 |
1.2 |
0.025 |
0.02 |
360 |
360 |
|
P235TR2 |
0.16 |
0.35 |
1.2 |
0.025 |
0.02 |
360 |
360 |
|
P265TR1 |
0.2 |
0.4 |
1.4 |
0.025 |
0.02 |
410 |
410 |
|
P265TR2 |
0.2 |
0.4 |
1.4 |
0.025 |
0.02 |
410 |
410 |
|
EN10217-2 |
P195GH |
0.13 |
0.35 |
0.7 |
0.025 |
0.02 |
320 |
320 |
P235GH |
0.16 |
0.35 |
1.2 |
0.025 |
0.02 |
360 |
360 |
|
P265GH |
0.2 |
0.4 |
1.4 |
0.025 |
0.02 |
410 |
410 |
|
EN10217-5 |
P235GH |
0.16 |
0.35 |
1.2 |
0.025 |
0.02 |
360 |
360 |
P265GH |
0.2 |
0.4 |
1.4 |
0.025 |
0.02 |
410 |
410 |
|
EN10219-1 |
S235JRH |
0.17 |
– |
1.4 |
0.04 |
0.04 |
360 |
360 |
S275JOH |
0.2 |
– |
1.5 |
0.035 |
0.035 |
410 |
410 |
|
S275J2H |
0.2 |
– |
1.5 |
0.03 |
0.03 |
410 |
410 |
|
S355JOH |
0.22 |
0.55 |
1.6 |
0.035 |
0.035 |
470 |
470 |
|
S355J2H |
0.22 |
0.55 |
1.6 |
0.03 |
0.03 |
470 |
470 |
|
S355K2H |
0.22 |
0.55 |
1.6 |
0.03 |
0.03 |
470 |
470 |
Applications of SSAW Steel Pipes
SSAW steel pipes are widely used in various industries due to their versatility and strength. Common applications include:
- Fluid Service: Suitable for transporting fluids in a variety of conditions.
- Low Pressure Fluid Service: Ideal for pipelines that carry low-pressure fluids.
- Pipelines for Low Pressure Fluid Service: Specifically designed for low-pressure fluid transport in pipelines.
- Pressure Applications: Used in systems that require pipes to withstand pressure, ensuring safety and durability.
- Pipe Piles: Commonly used in construction as pipe piles, providing structural support for foundations.
- Cold-Formed Welded Structural Hollow Sections: Made from non-alloy and fine-grain steels, these pipes are used in structural applications where strength and stability are needed.
- Pipeline Transportation for Petroleum and Natural Gas (Class A Steel Pipe): Essential for transporting petroleum and natural gas in large-scale pipeline systems.
- Casing or Tubing for Wells: Used in the petroleum and natural gas industries for well casing and tubing, offering protection and structural integrity for drilling operations.