| 摘要 |
PURPOSE:To improve corrosion resistance and die wear resistance by subjecting a steel sheet to temper rolling by special rolls so that the peak surfaces of the crests in the microscopical state forming the surface roughness of the steel sheet are flattened and the inter-crest intermediate flat parts are increased. CONSTITUTION:This steel sheet 7 for DI cans is temper-rolled by the special rolls to have 0.1-4mum center line average height of the surface and to be constituted of the microscopical state consisting of the crest parts 10 of the trapezoidal section having the flat peak surfaces 8, groove-shaped valley parts 11 and the intermediate flat parts 9. The average diameter (d) of the peak surfaces 8 is specified to 30-500mum and the relation Sm/D between the average distances Sm between the centers of the adjacent crest parts 10 and the average diameter D of the outside edges of the valley parts to 1-1.7. The tinned DI can steel obtd. by plating the above-mentioned steel sheet is highly resistant to corrosion and die wear. |
