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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Seamless pipe is made in sizes from 1/8” to 26” and is widely used in:
– Oil refining
– Chemical and
– Petro-chemical industries.
It is available in heavy wall thicknesses and exotic chemistries, and is suitable for coiling, flanging and threading.
Seamless pipe is available in the following specifications:
A53 Type S, which is seamless pipe, produced by hot working and possibly cold finishing, the steel (Grades A and ASTM A53) Type S is now currently an outdated specification and has been replaced by ASTM A106 specification for
seamless carbon steel pipe.
A-106 (ASTM A106 Seamless Pressure Pipe) Grades A.B, and C;
A-252 Grades 1, 2, and 3;
A-333 Grades 1 through 9; A-335 Grades P-1 through P-22;
A-501, A-523, A-589,
API5L Grades A & B, and
API5L X-42 through X-65.