Round Steel Tube Sizes

The introduction of Straight seam submerged arc welded pipes (LSAW):

1. Manufacturing process and quality control of pressure pipeline components - welded steel pipe

Welded steel pipe, is made by welding steel plates or strips after curling and forming. Welded steel pipe has a simple production process, high production efficiency, many varieties and specifications, and low equipment investment, but its general strength is lower than that of seamless steel pipe. Welded steel pipe is divided into straight seam welded pipe and spiral welded pipe according to the form of the weld. According to the production process, it is classified into arc welded pipe, resistance welded pipe, (high frequency, low frequency) gas welded pipe, furnace welded pipe, etc. Straight seam steel pipe can be divided into high-frequency straight seam steel pipe and submerged arc welded straight seam steel pipe according to the production process. The production process is simple, the production efficiency is high, the cost is low, and the development is relatively fast. The strength of spiral welded pipe is generally higher than that of straight seam welded pipe. It can produce welded pipes with larger diameters with narrower billets and welded pipes with different diameters with billets of the same width. However, compared with straight seam pipes of the same length, the weld length increases by 30-100%, and the production speed is lower. Therefore, smaller-diameter welded pipes are mostly welded by straight seam welding, while large-diameter welded pipes are mostly welded by spiral welding.

2. Manufacturing process of straight seam submerged arc welded steel pipes:

Straight seam submerged arc welded pipes (LSAW) are generally made of steel plates and are formed by double-sided submerged arc welding and post-weld expansion processes through different forming processes. The main equipment includes milling, pre-bending, forming, and pre-welding and expansion machines. At the same time, there are many forming methods for straight seam submerged arc welded pipes, such as UO (UOE), RB (RBE), and JCO (JCOE). The steel plate is roll-bent (Roll Bending), and then subjected to internal and external submerged arc welding. After welding, the diameter is expanded to RBE welded pipe or without expansion to RB welded pipe. The steel plate is formed in the order of J type → C type → O type, and after welding, the diameter is expanded to JCOE welded pipe or without expansion to JCO welded pipe.

Product Specification:

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