Casing is a pipe installed in a well, mainly used in underground projects such as oil wells, natural gas wells, water wells and geothermal wells.

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.