Steel pipe is manufactured in steel industry (integrated steelworks) by the blast furnace, rolling steel industry, and steel pipe manufacturing.In the former two, manufacturing is carried out from the steel ignot produced by the steel making, and the latter produces seamless steel pipe, ERW steel pipe, and forge welding steel pipe from tubing material which is accepted from others, wide steel strip, and steel strip.It is difficult to separate the data of hot rolling from the data of blast furnace iron making and steel roling industry, the steel pipe forming in steel pipe manufacturing is covered here.