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Welded steel pipe

Welded pipe also called welded steel pipe

     It is cut into narrow strip steel from a steel strip, and then cold processed with a mold to crimp it into a tube. The high-frequency submerged arc welding machine then welds a pipe seam. Due to the difference in welding process, it is divided into resistance welded pipe and automatic arc welded pipe. Due to the different welding form, it is divided into two types: straight seam welded pipe and spiral welded pipe.

Comparison of implementation standards home and abroad

China: GB/T3091-2015 Galvanized welded steel pipe for low pressure fluid transportation

GB/T14291-2006 (Welded steel pipe for mining fluid transportation)

American Standard: ASTM A252-98 (R2002) Standard Specification for Welded Steel and Seamless Steel Pipe Piles

German standard: DIN1615-84, DIN1626-84, DIN1628-84 non-alloy steel welded round pipe technical delivery conditions

Japanese standard: JIS-G3452/3457


Comparison of domestic and foreign steel grades

China: Q235B/Q345B

American Standard: ASTM A53/A283-D

German standard: (st33)1.003

Japanese standard: GGP/STRY41


The production process of straight seam welded pipe is simple, with high production efficiency, low cost and rapid development

Welded steel pipes are often used to transport fluids and powdered solids and exchange heat. It is also an economical steel. Using steel pipes to manufacture building structure grids, pillars and mechanical supports can reduce weight, save metal by 20-40%, and increase construction speed.

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