丸一鋼管
Maruichi American Corporation(MAC)
Maruichi Leavitt Pipe & Tube, LLC(Leavitt)
Maruichi Oregon Stell Tube, LLC(MOST)
MARUICHIMEX S.A. de C.V.(Maruichimex)
Maruichi Sun Steel Joint Stock Company
Maruichi Sun Steel (Hanoi) Company Limited
MARUICHI KUMA STEEL TUBE PRIVATE LIMITED
PT.Indonesia Steel Tube Works(ISTW)
Maruichi Metal Product(Foshan)Co.,Ltd.(MMP)
Maruichi Metal Product (Tianjin) Co.,Ltd.(MMP)
J-Spiral Steel Pipe Co.,Ltd