316 stainless steel has a higher carbon content, usually around 0.08%. 316L stainless steel is a low-carbon version of 316, with a carbon content controlled below 0.03%.

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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.