The forming mill is the mechanical heart of the tube production process. It is a massive machine that transforms a flat strip of steel (skelp) into a perfectly round, weld-ready cylinder.
The Process: The steel passes through a series of heavy-duty, contoured rollers.
The Stages: It starts at the "breakdown passes" (which curve the edges), moves to the "fin passes" (which guide the edges together), and finishes at the "sizing passes" (which ensure the exact Outside Diameter).