| 摘要 |
PURPOSE:To manufacture a can shell having high adhesive strength of coating film at the repairing coating part and high reliability without any contamination in can-making environment and contents in the can caused by scattering of grinding powder. CONSTITUTION:A steel sheet formed by sharing so that the faced two sides become substantially parallel is deformed to a cylinder type by facing parallel two sides and the overlapped two sides are welded. Then carbon content in the steel sheet is made at <=0.20wt.% and on the surface of the steel sheet, a metallic chromium layer having <=300mg/m<2> plating weight is provided and further, chromium hydrate oxide layer having <=30mg/m<2> in term of metallic chromium content is provided thereon. Further, at least one side surface of the steel sheet is welded in the condition satisfying the inequality 0.96>=V/t.F...(1), in which V is welding speed (mpm), F is welding power source frequency (Hz) and (t) is sheet thickness (mm), so that the metallic Cr layer is precipitated in granular state and the dispersing density of the metallic Cr grains having >=10mm diameter of base part is 10<10>-10<15> pieces/m<2>. |
