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API 5L Seamless Pipe


(SMLS) is made when steel in a solid, round cylindrical shape, called a “billet” or a “tube round” is heated and then

either pushed or pulled (while being rapidly rotated) over a mandrel with a piercing point positioned in the center

of the billet. This activity produces a hollow tube or “shell”. The tube is then further finished until it becomes the size

and wall thickness desired. (Because the pipe is formed in a heated manner the pipe is normalized and should have a

consistent steel cellular pattern throughout its circumference).

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