The difference between seamless stainless steel pipes and welded stainless steel pipes

The difference between seamless stainless steel pipes and welded stainless steel pipes

Stainless steel seamless steel pipe is a long strip of steel with a hollow cross-section and no seams around it.

Stainless steel welded steel pipes are also a type of steel with a hollow cross-section. Dalian Special Steel products are made by rolling steel plates into steel pipes and welding them, so there is a welding gap in the welded steel pipes.

Characteristics of 440C stainless steel seamless pipe

Firstly, the thicker the wall thickness of the product, the more economical and practical it is. The thinner the wall thickness, the higher its processing cost will be; Secondly, the process of this product determines its limited performance. Generally, seamless steel pipes have low accuracy, such as uneven wall thickness, low surface brightness inside and outside the pipe, high sizing cost, and difficult removal of pitting and black spots on the inner and outer surfaces; Thirdly, its detection and shaping must be processed offline. Therefore, it demonstrates its superiority in high pressure, high strength, and mechanical structural materials.

Types of 440C stainless steel pipes

The rolling methods include hot rolling, hot extrusion, and cold drawing (rolling) of stainless steel pipes.

Specification and appearance quality of 440C stainless steel pipes

A. According to GB14975-94 "Stainless Steel Seamless Steel Pipes", hot-rolled steel pipes are usually 1 in length (not specified). 5-10m, hot extruded steel pipes equal to or greater than 1m. Cold drawn (rolled) steel pipe with a wall thickness of 0. 5-1. For 0mm, 1. 0-7m; Wall thickness greater than 1. For 0mm, 1. 5-8m. Stainless steel welded pipes

B. 45 types of hot-rolled (hot extruded) steel pipes with a diameter of 54-480mm; Wall thickness 4. There are 36 types of 5-45mm. 65 types of cold drawn (rolled) steel pipes with a diameter of 6-200mm; Wall thickness 0. There are a total of 39 types ranging from 5 to 21mm.

C. The inner and outer surfaces of the steel pipe shall not have cracks, folds, cracks, rolling folds, delamination, or scarring defects. These defects shall be completely removed (except for pipes used for mechanical processing), and after removal, the wall thickness and outer diameter shall not exceed negative deviation. Any other minor surface defects that do not exceed the allowable negative deviation may not be removed.

D. The allowable depth of the straight path. Hot rolled and extruded steel pipes, with a diameter less than or equal to 140mm, not exceeding 5% of the nominal wall thickness, and a maximum depth not exceeding 0. 5mm; Cold drawn (rolled) steel pipes shall not exceed 4% of the nominal wall thickness, and the maximum depth shall not exceed 0. 3mm. Stainless steel welded pipe manufacturer

E. The two ends of the steel pipe should be cut at right angles and burrs should be removed.

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