... 40Cr,20-42CrMo,20-30CrMnTiDescriptionCarbon structure steel/carbon steel round bar/flat bar/carbon steel plate/sheetGradeGB Q255/JIS SS490/DIN ... such as bolt,chain,pull rod,shape steel,steel plate,flat bar steel and so onPackaging We provide the ... Our main products are H beam steel, angle steel, round steel, steel billet, strip steel, gear steel, twisted steel, channel steel, etc. All these products ...