Product Description

Welded steel tubes boast simple production techniques, high production efficiency, complete specifications and few types of equipment, but their strength is lower than the seamless steel tubes. Since the ***0s, with the rapid development of excellent belt steel rolling production as well as the advancement of welding and inspection technology, the quality of welded tubes have constantly been improved, and there are more and more specifications. They have replaced the seamless steel tubes in more and more fields. The welded steel tubes include straight slot tubes and spiral tubes in accordance with seaming types. The welded steel tubes are made of steel sheets or strip steel, and they include soldering tubes, electrical welded tubes and automatic arc welded tubes in accordance with the welding techniques. They also include straight slot tubes and spiral tubes in accordance with seaming types. There are round welded tubes and special-shaped (square or flat) welded tubes in accordance with the shapes of the ends. The welded tubes include the following types in accordance with theirs materials and uses: GB/T********3 (zinc-coating welding steel tubes for conveying low pressure liquids): mainly used for conveying water, gas, air, oil, heating water, steam or other low pressure liquids. Its representative material is Grade Q**5A steel. GB/T********3 (zinc-coating welding steel tubes for conveying low pressure liquids): mainly used for conveying water, gas, air, oil, heating water, steam or other low pressure liquids. Its representative material is Grade Q**5A steel. GB/T*********2 (welded steel tube for mine liquid service): mainly used as the straight slot welded steel tubes in the mine compressed air, drainage or gas drainage). Its representative material is Grade Q**5A and B steel. GB/T*********4 (large diameter electric welded tubes for conveying low pressure liquid): mainly used for conveying water, waste water, air, heating steam or other low pressure liquids or uses. Its representative material is Grade Q**5A steel. GB/T*********1 (stainless welded steel tubes for mechanical structure use): mainly used in the machinery, automobile, bicycle, furniture, hotel decorations or other mechanical parts or structures. Its representative materials are 0Cr*3, 1Cr*7, *0Cr*9Ni*1, 1Cr*8Ni9 and 0Cr*8Ni*1Nb. GB/T*********1 (stainless welded steel tubes for mechanical structure use): mainly used for low pressure corrosive medium. Its representative materials are 0Cr*3, 0Cr*9Ni9, *0Cr*9Ni*1, *0Cr*7, 0Cr*8Ni*1Nb and ***7Cr*7Ni*4Mo2.