LSAW vs SSAW, How to Make the Best Choose

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LSAW vs SSAW can classify steel pipe types according to different welding forms.

Welded steel pipe is also called welded pipe, which is made of steel plate or steel strip by pressing.

Welded pipe has a wide variety of specifications, simple production process, less investment in consumption equipment, high production efficiency, but its strength is lower than seamless steel pipe.

The forming process of seamless steel pipes is different from that of welded pipes, and seamless steel pipes do not have welds by overloading molten steel and then stretching forming, which is considered stronger.

However, seamless tubes cost 25-40% more per ton than LSAW vs SSAW tubes. Seamless tubes are manufactured in sizes from 1/8″ to 36″.

Let’s talk more about the differences between the two types of pipes LSAW vs SSAW. A full understanding of their different functional features and applications can help engineers and decision makers choose the type of pipeline that best meets their specific application needs.


LSAW vs SSAW, Main Feature


  1. Process: Longitudinal weld of steel pipe, submerged arc welding inside and outside weld.
  2. Product specification range: Small diameter big wall thick steel pipe, big diameter big wall thick steel pipe can be produced.
  3. Stability: The use of pre-welding, fine welding multiple processes, stable welding process, high weld quality. Welding seams are easy to achieve non-destructive testing in the production process and in the field.
  4. Convenient: After the mechanical pipe expansion treatment, the internal stress of the steel pipe is small, the distribution is uniform, the stress corrosion cracking is effectively avoided, the precision is high, and the on-site welding construction is convenient.


  1. Cost: Spiral steel pipe is about 300 yuan/ton cheaper than straight steel pipe. Spiral submerged arc welding pipe equipment investment is less, the production process is simple, the operation cost is low, has the advantages of low-cost operation.
  2. Application: Widely used in pressure pipeline engineering, especially gas pipelines, there should be necessary hardware configuration, such as physical and chemical testing facilities and non-destructive testing, through strengthening quality assurance measures, strictly in accordance with the production license supervision.

LSAW vs SSAW, Manufacturing Process

LSAW vs SSAW, they use the same manufacturing technology, JCOE and UOE manufacturing processes.

SSAW pipes use spiral welding technology, the manufacturing process is to wind and weld the steel strip at an Angle to the axis or the center of the tube, so that the weld is in a spiral.

LSAW pipes use longitudinal welding. The production purpose is achieved by making the steel plate mold into a cylinder, and then connecting the ends together by straight welding.

Specification of LSAW vs SSAW

SSAW pipes diameters: 20″ to 100″ (406 mm to 25040 mm);

LSAW pipes: 16 inches to 60 inches (406 mm to 1500 mm).




Outer diameter

508 mm – 1118 mm (20″- 44″)

219.1 mm – 2032 mm

Wall thickness

6.0 mm – 75 mm 1/4″-1″

6 mm – 25.4 mm (SCH 20 to SCH XXS)


9 m – 12.3 m (30′ – 40′)

6 m – 18 m, SRL, DRL

Quality standard

API 5L A-X90, GB/T9711 L190-L625, API 5L A-X100, GB/T9711 L190-L690

API 5L, ASTM A53, ASTM A252, ASTM A500

In the vast field of pipe selection for industrial applications, the production of steel pipes can offer a wide variety of forms and sizes, and the choice can be dizzying.

LSAW vs SSAW, how to choose mainly depends on the specific needs of the project, including cost budget, application installation environment, pipe pressure level and the type of transport medium.

A full understanding of the different performance characteristics and advantages of these two pipelines is of great benefit to decision makers to make a more appropriate choice, and ultimately meet the needs of the project, ensure efficient operation, and greatly improve safety and reliability.