SSAW (Spiral Submerged-Arc Welded) Steel Pipes, also called HSAW pipe, with welding seam in spiral(helix) type, can be manufactured in large diameter and length.

OD: 219-3660MM (8''-144'')
WT: 5-30mm
Length: 2-30m
Standard: API 5L, ASTM A252, ASTM A53, SY/T5037, SY/T5040, GB.T3091, BG/T9711, EN10217, EN10219, EN10224, EN10025
Material: API 5L GR.B, X42!X70, ASTM A252 GR.2, GR.3, A53-B, Q235B, Q345B, 16Mn, L245~L555, L275, L355, etc.

【Product Features】

High Strength
The main body of the spiral welded pipe is made of Q355B low-alloy high-strength structural steel, with a yield strength of 355MPa and a tensile strength of 470-630MPa. Under the same wall thickness, the load-bearing capacity is about 30% higher than that of ordinary carbon steel welded pipes.

Long Life
The surface of the spiral welded pipe adopts a three-layer PE anti-corrosion coating, with a bottom epoxy powder coating thickness of 100-150μm, a middle layer adhesive thickness of 170-250μm, and an outer polyethylene coating thickness of 2.5-4.5mm, forming a multi-layer protective structure that effectively resists soil corrosion and chemical medium erosion, extending the service life of the pipe to more than 50 years, which is 2 times longer than that of ordinary welded pipes.

【Product Application】

Oil And Gas Transportation Industry
In the oil and gas transportation industry, spiral welded pipe is mainly used to build long-distance transportation pipeline systems.

Urban Water Supply System Field
In the field of urban water supply system, spiral welded pipe undertakes the task of trunk water pipeline.

Sewage Treatment Engineering
In the field of sewage treatment engineering, spiral welded pipe is used as a connecting pipe for sewage transportation and treatment equipment.

Bridge Construction Engineering Field
In the field of bridge construction engineering, spiral welded pipe is often used to manufacture bridge pile foundations and supporting structures.

Marine Engineering Construction Industry
In the marine engineering construction industry, spiral welded pipe is used for submarine pipeline laying and offshore platform support structures.

【Frequently Asked Questions】

What is a spiral welded pipe?

A spiral welded pipe is a spiral seam steel pipe made of strip steel coils, spirally formed by a forming machine, and made by double-sided submerged arc welding or high-frequency welding. It has the characteristics of high strength and good toughness and is widely used in oil and gas transportation and other fields.

What are the manufacturing processes of spirial welded pipe?

The main spiral welded pipes are spiral submerged arc welding (SSAW) and high-frequency resistance welding (HFW). SSAW is welded by submerged arc welding, and the weld quality is high; HFW uses high-frequency current to heat and fuse the weld edge, with high production efficiency, and is suitable for small and medium diameter pipes.

What is the specification range of spirial welded pipe?

The outer diameter of spirial welded pipe is usually between 219 and 3620mm, the wall thickness range is 5 to 25.4mm, and the length is generally 6 to 12m.

What are the materials of spirial welded pipe?
Common materials for spirial welded pipe include carbon structural steels such as Q235 and Q345, and pipeline steels such as X42 - X80. Carbon structural steel is suitable for general engineering structures, while pipeline steel is mainly used for oil and gas pipelines, with high strength and good toughness.

What are the anti-corrosion measures for spirial welded pipe?

Common anti-corrosion methods for spirial welded pipe include coating anti-corrosion and cathodic protection. Coating anti-corrosion, such as fused epoxy powder coating and three-layer PE coating, can isolate air and moisture; cathodic protection prevents electrochemical corrosion of pipelines through impressed current or sacrificial anode.

What are the application scenarios of spirial welded pipe in construction projects?

Spiral welded pipe is often used for foundation piles and bridge piling of high-rise buildings. Due to its high strength and large diameter, it can effectively bear the weight and load of the building; it can also be used as a steel structure support for large buildings to enhance structural stability.

What are the precautions for the transportation and storage of spirial welded pipe?
When transporting the spirial welded pipe, it should be firmly fixed to avoid collision and scratching the anti-corrosion layer; the storage site should be dry, ventilated, and away from corrosive substances. The bottom of the pipe should be supported by wooden blocks to prevent deformation, and the anti-corrosion layer and appearance quality should be checked regularly.

How to maintain spirial welded pipe during use?
Regularly check the operating pressure, temperature, flow and other parameters of the spirial welded pipe to monitor the integrity of the anti-corrosion layer; perform non-destructive testing on welds and easily corroded parts; promptly deal with leaks, corrosion and other problems found to ensure safe operation of the pipeline.