Boiler tubes, wrought, made from purchased iron

Conduit, welded and lock joint, made from purchased iron or steel

Pipe (e.g., heavy riveted, lock joint, seamless, welded) made from purchased iron or steel

Tube (e.g., heavy riveted, lock joint, seamless, welded) made from purchased iron or steel

Tubing, mechanical and hypodermic sizes, cold-drawn stainless steel, made from purchased steel

Well casings (e.g., heavy riveted, lock joint, welded, wrought) made from purchased iron or steel