Seamless piping begins as a solid cylindrical hunk of steel called a billet. While still hot, billets are pierced through the center with a mandrel. The next step is rolling and stretching the hollow billet. The billet is precisely rolled and stretched until it meets the length, diameter and wall thickness as specified by the customer order.
Some seamless pipe types harden as they’re manufactured, so heat treatment after manufacturing is not required. Others do require heat treatment. Consult the specification of the seamless pipe type you’re considering to learn whether it will require heat treatment.
API 5L SSAW Steel Pipe Definition and Grades
How to Calculate MS Pipe Weight: Complete Formula, Chart & Examples
SAW vs ERW and EFW Welded Steel Pipe
Stainless Steel Pipe OD and Wall Thickness Explained
