Large Diameter Thick Wall Straight Seam Welded Steel Pipe

Generally, straight seam welded pipes with a diameter of more than 325 are called large diameter welded pipes. The welding process used for large-diameter thick-walled longitudinal seam welded pipes is double-sided submerged arc welding technology, and manual welding can also be performed after the steel pipes are formed.

1.Product specifications:

Steel pipe diameter: 325-1422.4mm Steel pipe length: 1-14m Wall thickness: the production range of ordinary carbon and low carbon alloy materials is 8-80mm; Pipeline steel of steel grade above X70, the wall thickness can reach 8-26.4mm (0.315-1.04in) 

2. Purpose: 

It is mainly used for the transportation of land and sea oil and gas, coal slurry, ore slurry and other media, as well as pipes for offshore platforms, power stations, chemical industry and urban building structures. 

3. Main features: 

After the overall mechanical expansion treatment, the internal stress of the steel pipe is small and evenly distributed, which can effectively prevent stress corrosion cracking, and the dimensional accuracy is high, which is convenient for on-site welding construction. Adopt the precise and powerful process after pre-welding, the welding process is stable, and the weld seam quality is high. The welding seam is easy to realize the non-destructive flaw detection in the production process and the field non-destructive flaw detection review in the use process. Compared with welded pipes with non-straight seams, the weld seam is short and the probability of welding defects is small. The range of product specifications is wide, and it can produce steel pipes with small diameter and large wall thickness as well as large diameter and large wall thickness.