Seamless
/glossary/seamlessPipe without weld seam, manufactured by hot-piercing solid steel billet.
In detail
Seamless pipe is manufactured by heating a solid steel billet and piercing it over a mandrel to form a hollow tube, followed by rolling and sizing operations. No weld seam exists, providing uniform strength in all directions and isotropic properties essential for high-pressure and high-temperature service. Seamless pipes are mandatory for IBR boiler applications, hydraulic systems, and sour service. ASME SA grades (SA179, SA192, SA210, SA213) and ASTM A106 govern seamless pipe specifications.
Where you'll meet this in procurement
You will meet Seamless when choosing process route and product family. Match Seamless to pressure, temperature, corrosion duty, and standard (IS, ASTM, ASME, or API) so the mill route and documentation line up with the application.