ERW PIPE

A pipe made by electric welding at high frequency after unwinding a coil and
bending it to a pipe-shape on a roller.

CD PIPE

A pipe manufactured by mechanically pulling it to reduce cross sectional area and
extend the length while passing the pipe material through a workbench.

SEAMLESS PIPE

A metal pipe made by methods other than forge welding and welding.

Powder metallurgy

A manufacturing method in which a metal product is made after metal power is put into
a mold for compression molding by a molding machine, and be heated and
sintered at temperatures below a melting point.