SSAW, HSAW or SAWL)-CONTINENTAL STEEL CO.,LTD

LSAW Pipes have a slight advantage over SSAW Pipes. The following points explain why.

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SSAW pipes have greater residual stresses than LSAW pipes. The straight seam submerged arc welded pipe undergoes a uniform expansion process.

The stress concentration phenomenon of SSAW pipe welds belongs to the severe category. SSAW pipes have a larger heat affected zone than LSAW pipes. The heat-affected zone is considered a weak point where failure may begin.

The geometric accuracy of LSAW pipe is better than that of SSAW pipe, which is the key to ease of installation.

LSAW pipe has approximately 60% fewer welds than SSAW pipe.

Brief description and comparison of LSAW, SSAW and ERW pipes

Quality steel pipe is produced by three (3) manufacturing processes: Seamless, LSAW (Longitudinal Submerged Arc Welding) and ERW (Electric Resistance Welding). LSAW and ERW tubes are highly regarded for their wide range of applications. They are widely used in basic solutions and systems, marine construction, structural construction, and various applications in the fields of hydraulic engineering, petrochemical, chemical and power industries, agricultural irrigation, and urban construction.

LSAW pipe comes in two types: longitudinal (single or double straight seam weld, DSAW) and helical (also known as SSAW, HSAW or SAWL). LSAW pipe differs from other LSAW pipes in that LSAW pipe has a seam weld on the inside and outside of the pipe, while the latter has only one seam weld on the outer surface, longitudinal or cross-section.

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SSAW and LSAW pipes are manufactured using a common manufacturing process known as the "JCOE and UOE Forming Process". The difference is that SSAW pipes are welded in a helical or helical position while LSAW pipes are welded longitudinally.

The SSAW pipe is wound and welded by steel strip, its rotation direction is inclined to the axis or the center of the pipe, and the weld seam is helical. LSAW pipe is made by forming a steel plate into a cylinder and joining the ends together by straight-line welding.

LSAW pipe diameters typically range from 16" to 60" (406mm to mm). They have good high pressure and low temperature corrosion resistance.

However, CSC Steel can supply pipe with diameters between 1 inch and 167 inches (21 mm and mm) and thicknesses between 3/32 inch and 4 inches (2.1 mm and 100 mm). ESC steel pipe is manufactured using LSAW in maximum diameter and thickness and is highly recommended for load bearing piles, composite wall piles and other applications. In the oil and gas industry, large diameter API 5L LSAW pipe is used to efficiently transport hydrocarbons over long distances.

HSAW (Spiral Submerged Arc Welding) or SSAW pipe diameters typically range from 20" to 100" (406 mm to mm). One of the advantages of SSAW is the possibility of obtaining different diameters

ERW pipe
ERW Tube Forming
   SSAW pipe is made from standard size steel strip without cutting. On the other hand, the length of the spiral weld is much longer than the length of the pipe, the cost is higher, and it is prone to cracks, pores, slag inclusions, partial welding, etc.

What is the biggest difference between SSAW steel pipe and LSAW steel pipe?

Spiral submerged arc welded pipes and longitudinal submerged arc welded pipes are carbon steel pipes that use submerged arc welding technology. Submerged arc welding is a welding method in which the arc burns under a layer of flux. Its inherent advantages such as stable welding quality, high welding productivity, no arc, and less smoke make it the main welding method in the production of important steel structures such as pressure vessels, pipes, box beams, and columns.
LSAW (straight seam submerged arc welding) is produced by pressing (rolling) a single medium-thick plate in a mold or forming machine and using double-sided submerged arc welding and diameter expansion. The finished product has complete specifications, has good toughness, plasticity, uniformity and density of welds, and has the advantages of large pipe diameter, thick pipe wall, high pressure resistance, low temperature resistance, and strong corrosion resistance. It is widely used in the construction of long-distance oil and gas pipelines with high strength, high toughness and high quality. According to API standards, in large oil and gas pipelines, straight seam submerged arc is the only specified pipe type when passing through Class I and Class II areas such as alpine areas, seabed, and densely populated urban areas.

SSAW steel pipe (spiral submerged arc welded steel pipe) is a pipe rolled in such a way that its forward direction forms a forming angle with the center line of the formed pipe, and is welded while forming. The weld is in a spiral shape. The advantage is that the same specification can produce steel pipes of various diameters. , the raw material has great adaptability, the weld can avoid the main stress, and the stress condition is better. The disadvantage is that the geometric dimensions are poor, the weld length is longer than that of straight seam pipes, and welding defects such as cracks, pores, slag inclusions, and welding deviations are prone to occur, and the welding stress is in a tensile stress state. Generally, the design specifications for long-distance oil and gas pipelines stipulate that spiral submerged arc welding can only be used in Category III and Category IV areas.

Main features

Main features of straight seam submerged arc welded steel pipe:
1) The steel pipe has longitudinal welds, and the internal and external welds are welded by submerged arc welding.
2) After the overall mechanical diameter expansion treatment, the internal stress of the steel pipe is small and evenly distributed, which can effectively prevent stress corrosion cracking, and has high dimensional accuracy, which facilitates on-site welding construction.
3) Using pre-welding and precision welding processes, the welding process is stable and the weld quality is high. Welds are easy to implement non-destructive testing during production and on-site during use.
4) The range of product specifications is large, and it can produce both small diameter and large wall thickness steel pipes and large diameter and large wall thickness steel pipes.

Main features of SSAW steel pipe:
1) Spiral submerged arc welded pipe equipment has low investment, simple production process, low operating cost, and has the advantages of low-cost operation.

2) When used in pressure pipeline projects, especially gas pipelines, there should be necessary hardware configurations, such as non-destructive testing and physical and chemical testing facilities. Quality assurance measures should be strengthened and supervision should be strictly carried out in accordance with the production license.

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