What Is Seamless Stainless Steel Pipe

Seamless stainless steel pipe is a long steel with a hollow cross section and no seams on the periphery. 

The manufacturing process of seamless stainless steel pipe is to punch a hole in the stainless steel billet at 2200 ° F. at this high temperature, the tool steel becomes soft and spiral from the hole after stamping and drawing. This results in uneven wall thickness and high eccentricity of seamless stainless steel pipe.

Features of seamless stainless steel pipe: first, the thicker the wall thickness of the product, the more economical and practical it will be. The thinner the wall thickness, the higher the processing cost will be; second, the process of the product determines its limited performance. Generally, the precision of seamless steel pipe is low: the wall thickness is uneven, the inner and outer surface brightness of the pipe is low, the sizing cost is high, and there are pockmarks and black spots on the inner and outer surface that are not easy to remove Besides, its detection and shaping must be handled offline. Therefore, it shows its advantages in high pressure, high strength and mechanical structure materials. 

Classification of seamless stainless steel pipe: According to the rolling method, it can be divided into hot rolling, hot extrusion and cold drawing (rolling) stainless steel pipe; According to the different metallographic structure of stainless steel, it can be divided into semi ferritic semi martensitic stainless steel seamless pipe, martensitic stainless steel seamless pipe, austenite ferritic stainless steel seamless pipe, etc; According to the section shape, it can be divided into circular pipe and special-shaped pipe. Circular steel pipe is widely used, but there are also some square, rectangular, semicircle, hexagon, equilateral triangle, octagon and other special-shaped stainless steel pipes.

Disadvantages of seamless stainless steel pipe: due to the lack of chemical composition suitable for welding, there will be various unstable factors in the welding process, which is not easy to be welded firmly and completely. 

Seamless stainless steel pipe is usually used in the common structure and mechanical structure of seamless stainless steel pipe. For example, the hot / cold rolling of various stainless steel, chemical and petroleum equipment pipes and various stainless steel structural parts for different purposes.