Seamless steel pipes used in steel construction. 1) Dimentions: 30*30mm-800*800mm, Thickness: 3- ... structure, machinery making, container, hall structure, sun seeker, offshore oil field, sea trestle,3) Standards: JIS G 3466, DIN EN 10210 ... A106,STKR4907) Plain or beveled ends Seamless Square Steel Pipe used in construction