This small-diameter seamless steel pipe is made by piercing round billets of heated steel and then rolling them in a mandrel mill.
Small diameter pipe mill：OD:1～7in. (25.4～177.8mm)，WT：0.09～1.38in. (2.3～35mm)，Length：13～50ft (4～15.3m)
This medium-diameter seamless steel pipe is made by piercing round billets of heated steel and then rolling them in a plug mill.
Medium diameter pipe mill：OD:7～16 3/4in. (177.8～426mm)，WT：0.19～2.16in. (4.8～55mm)，Length：18～44.6ft (5.5～13.6m)
Small-diameter steel pipe can be manufactured with an outside diameter of 28.6 mm to 168.3 mm, enabling supply of optimum steel pipe for specific applications.
3in mill：1.315～3.004in. (33.4～76.3mm)，WT：0.024～0.5in (0.6～12.7mm)，Length：13～59ft (4～18m)
6in mill：2.382～6.626in. (60.5～168.3mm)，WT：0.071～0.5in (1.8～12.7mm)，Length：13～52ft (4～16m)
This steel is made by forming hot rolled coil into a tubular shape and then welding with a high-frequency resistance welding (HFW) process.
24in mill：7～24in. (177.8～610.0mm)，WT：0.188～0.752in (4.8～19.1mm)，Length：Max. 60ft (Max. 18.3m)
26in mill：12.539～26in. (318.5～660.0mm)，WT：0.188～1.00in (4.8～25.4mm)，Length：18～66ft (5.5～20m)
This steel pipe is made by forming hot rolled coil into a spiral shape and then welding the seams from inside and outside.
Bending steel pipe
Also called “plate bending” pipe, this pipe is made by gas cutting steel plate, bending the edges of the plate, and then forming into a tube shape by press bending.
Steel pipe that is formed in two stages from plate - first bent into a “U” shape and then into an “O” shape - and then seam welded from inside and outside.