N80钢级 Steel grade N80

n80钢级 n grade

N80钢片 N80 piecl of steel

n80钢片 n steel piece

N80钢管 N80 steel pipe

含铬N80钢 Cr-containing N80 steel

含铬n80钢 corrosion cr-containing n steel

j55和n80钢 j and n steels

非调质N80钢 un-hardened and tempered N80 steel