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Judging the quality of straight seam steel pipe involves assessing various factors related to its manufacturing, structure, and performance.

Large diameter spiral welded steel pipe is a steel pipe used to transport liquids or gases and support structures. It is characterized by a large diameter, usually greater than 24 inches (609.6 mm). This type of pipe is usually manufactured through a spiral welding process, hence the name spiral welded steel pipe.

321 has one more trace element of titanium than 304. The role of titanium in stainless steel is very obvious, which can make stainless steel pipes have better corrosion resistance and high temperature resistance.