Stainless steel tubes and pipes can be divided into two main categories: seamless stainless steel tubes and welded stainless steel tubes (seamed tubes). According to the shape of the section can be further divided into round and shaped tubes, widely used is round steel pipe, but there are also some square, rectangular, semi-circular, hexagonal, equilateral triangle, octagonal and other shaped steel pipe. Stainless steel materials mainly include 201 (1Cr17Mn6Ni5N), 202 (1Cr18Mn8Ni5N), 301 (1Cr17Ni7), 304 (0Cr18Ni9), 304L (00Cr19Ni10), 321 (1Cr18Ni9Ti), 316 (0Cr18Ni12M02), 316L ( 00Cr17Ni14M02). (The contents in brackets are the corresponding Chinese Grades.)

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