... Phi; 500mm, Φ 450mm, rough rolling mill group, Φ 400mm rough rolling mill group and medium rolling mill group 650mm, Φ 500mm, ... guide rail, roller etc. )II. Rolling steel products: I-bar, angle bar, U-bar, round bar, deformed steel bar. ... , mainly adjustment of steel rolling mill, new products development, equipment maintenance and improvement. steel rolling mill production line and parts