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Stainless steel welded pipe is a steel pipe made of plate or steel strip after crimping and welding. SS welded pipe has simple production process, high production efficiency, many varieties and specifications, and less equipment investment. The advantage is low cost, but its general strength is lower than that of seamless steel pipe. Common stainless pipe welding includes electric resistance welding (ERW), electric-fusion welding (EFW), submerged arc welding (SAW), longitudinal submerged arc welding Longitude (SAWL), and transverse submerged arc welding SAWH. With the rapid development of continuous rolling production of high-quality strip steel and the advancement of welding and inspection technology, the quality of welds has been continuously improved. The varieties and specifications of stainless steel welded pipe are increasing day by day, and they have replaced seamless steel pipes in more and more fields, especially in heat exchange equipment pipes, decorative pipes, and medium and low pressure fluid pipes.

Stainless steel welded pipe material standard：

• ASTM A312 : Standard Specification for Seamless, Welded, and Heavily Cold Worked Austenitic Stainless Steel Pipes

 

• ASTM A269 : Standard Specification for Seamless and Welded Austenitic Stainless Steel Tubing for General Service

 

• ASTM B676 : Specification for UNS N08367 Welded Tube

Stainless Steel Welded Pipe Specifications

We are stainless steel welded pipe in compliance with ASTM A312, ASME SA312, ASTM A269, ASME SA269, ASTM B676, ASME SB676 standards. Including various grades TP304, TP304L, TP310S, TP316, TP316L, 316Ti, TP317, TP317L, TP321, TP347, TP347H, N08367, N08926, N08904, S31254.Our stainless steel welded pipes comply with national and international material standards, and the quality and performance are guaranteed. 

Stainless steel welded pipe is usually a large diameter pipe, and the production size standard of Pipe complies with ASME B36.19. Stainless steel ERW pipes are generally large-diameter pipes and are widely used. They are mainly used for low-pressure fluid pipes and a large number of pipes for transporting fluids, such as water, gas, natural gas, oil, boilers, mechanical parts, and sewage pipes. Due to the corrosion resistance and high strength of 304 stainless steel welded pipe, EFW stainless steel pipe is also widely used in furniture, electrical appliances and other industries, such as kitchen sinks, water heaters, TV racks, etc.

Chemical Composition of Stainless Steel Welded Pipe

Stainless Steel Welded Pipe Mechanical Properties

Stainless Steel Welded Pipe Production Process

Typical production process of SS welded pipe: Raw material decoiling—flattening—end shearing and welding—loop—forming—welding—removal of inner and outer welding beads—pre-calibration—heat treatment—sizing and alignment—eddy current testing—cutting—hydraulic pressure inspection—pickling—final inspection—packing—shipment.

The raw materials of spiral steel pipe are steel coil, welding wire and flux. Before forming, the strip steel is leveled, trimmed, planed, surface cleaned, transported and pre-bent. The weld gap control device is used to ensure that the weld gap meets the welding requirements, and the pipe diameter, misalignment and weld gap are strictly controlled. After cutting into single steel pipes, the first three steel pipes of each batch must undergo a strict first inspection system to check the mechanical properties, chemical composition and fusion status of the welds. After the surface quality of the steel pipe and the non-destructive flaw detection are checked to ensure that the pipe-making process is qualified, it will be officially put into production.

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