... and to make the mechanic performance of the ductile casting pipe meet the requirement of ISO2531-2003 (E) ... , special steel, machining, chemical industry, heavy industry, metallurgy, casting, casting tube factories, forging, flange rings, steel structure, pull wires, ... rollers, steel pipe, bulb tube, steel wire, steel ball, casting, forged pieces, rollers, lamina, high-speed steel, tool steel, car ...