Seamless stainless steel pipe started earlier in China, with 10 enterprises producing high standard pipe, with an average output of 8000 tons / year. China's stainless steel welded pipe started late and developed rapidly, with more than 400 stainless steel welded pipe production lines.

Stainless steel pipe is divided into seamless pipe and welded pipe. Seamless stainless steel pipe started earlier in China. So far, there are more than 1000 enterprises producing seamless stainless steel pipe, and the comprehensive production capacity is more than 300000 tons. However, there are 10 enterprises producing high standard pipe, with an average output of 8000 tons / year. China's stainless steel welded pipe started late and developed rapidly. So far, there are more than 400 stainless steel welded pipe production lines with an estimated production capacity of about 720000 tons per year. Among them, there are more than 100 imported production lines with a production capacity of 80000 to 100000 tons. However, the production capacity of high standard industrial pipe is very small and the output is less. Most units produce civil pipe and low standard industrial pipe. As the stainless steel welded pipe is a secondary processing product, there are many and scattered production enterprises, so the statistics of its output and consumption vary greatly. According to the analysis of various statistical data, the production and consumption of stainless steel welded pipe in China are about 720000 tons / A, and the consumption and production are basically balanced.

Seamless pipe: the main production process of international advanced high-capacity hot-rolled seamless steel pipe is: electric arc furnace or converter smelting → LF refining → VD vacuum treatment → fully protected continuous casting round billet → guide plate (plate) piercing, hot continuous rolling → sizing (reducing) → heat treatment → pipe processing. Today's advanced cold working seamless steel pipe production process should be as follows: round billet heating → piercing (hot rolling) into wall thickness, shape, surface high-precision tube → 1 to 2 passes of cold drawing (or cold rolling) → protective atmosphere heat treatment → on-line nondestructive testing. Seamless stainless steel pipe is mainly used in chemical industry, chemical fertilizer, chemical fiber, petrochemical, electric power, nuclear industry, aviation, aerospace and other fields.

Welded pipe: strip raw material to raw material pretreatment to cold bending forming to welding to weld heat treatment to weld (pipe body) flaw detection to finishing to finished welded pipe.

The main application fields of stainless steel pipe are urban landscape engineering and architectural decoration engineering. It also has a considerable proportion in light industry, pharmacy, papermaking, sewage treatment, water supply engineering and other fields. In chemical industry, chemical fertilizer, petrochemical and other fields, medium and low pressure transmission pipes with specifications above 159mm are generally selected. Automobile muffler is also the application field of stainless steel welded pipe.

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