| 摘要 |
PURPOSE: To produce a chromium plated steel sheet for cylindrical can body, excellent in high speed continuous weldability, by laminating a metallic chromium layer having projections and a chromium hydrated oxide layer on the surface of a steel sheet under respectively specified conditions. CONSTITUTION: A metallic chromium layer of (25 to 200)mg/m<2> is formed on the surface of a steel sheet, and a chromium hydrated oxide layer of (2.5 to 20)mg/m<2> expressed in terms of metallic chromium is formed on the above layer. At this time, the metallic chromium layer is applied so that it is partly formed into projections while continuously coating a substrate Fe layer, and further, the diameter of the base of a projection, the height of the projection from the base, and the existense density of the projections are regulated to 30-50nm, >=10nm, and (1×10<12> to 1×10<15> ) pieces/m<2> , respectively. Moreover, in the region from the outermost surface of the steel sheet as a plating substrate to the position at a depth of 20μm from the outermost surface, C and Mn are incorporated by 0.001-0.18% and 0.10-0.6%, respectively, by average weight percentages. By setting the heat generating velocity in the interface between the sheets at the time of welding to a desirable value, welding operations can be performed in high efficiency, at the time of forming a cylindrical can body by using the chromium plated steel sheet produced by this method.
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