- ERW can be divided into two forms: induction welding and contact welding. It uses hot-rolled wide coils as raw materials and is made through pre-bending, continuous forming, welding, heat treatment, sizing, straightening, cutting and other processes. Spiral welds are short and have the advantages of high dimensional accuracy, uniform wall thickness, good surface quality, and high pressure. However, the disadvantage is that they can only produce thin-walled pipes of small and medium diameters, and the welds are prone to gray leaf spots and infusible grooves. Corrosion defects. Widely used in urban gas and crude oil transportation fields.
Outer diameter: 114-356mm (4"-14")
Specifications: 3.0-12.7mm (1/8"-1/2")
Specifications: API, BS, ASTM, JIS, DIN, GB, ISO, DNV
Length: 3-12.2m (10'-40')
Quality: GB/T9711 L190-L555 (API 5L A-X80)
- SSAW pipe is made of hot-rolled coil steel and welded by automatic submerged arc welding at room temperature. All pipes are produced in accordance with API Spec 5L, GB/T9711.1, GB/T9711.2, and ASTM A252-89 standards. These pipelines are primarily used in the oil and gas industry to transport flammable and non-flammable liquids and in steel structures. Spiral welded pipes are widely used in oil, natural gas, water and other flammable and non-flammable liquid transportation and distribution pipelines, building steel structures and other general purposes due to their wide range of sizes.
- LSAW is produced using double-sided submerged arc welding, flaring and other raw materials on molds or forming machines. The finished product has a wide range of specifications, good weld toughness, good ductility, uniform and dense, and has the advantages of large diameter, large wall thickness, high pressure resistance, and low temperature corrosion resistance. In construction, long-distance oil and gas pipelines that require high strength, high toughness, and high quality steel pipes mostly use large-diameter, thick-walled straight seam submerged arc welded pipes.
