STEEL SHEET SUPERIOR IN COATING BRIGHTNESS, ANTI-SCRATCHING PROPERTIES AND WORKABILITY

摘要

A high tensile strength steel sheet for the exterior of automobiles or household electric appliances which is improved in lubricating capability during press working by forming regular recessed and raised portions on the surface thereof and regulating the configurations of the two portions, and which has coating brightness and anti-scratching properties, wherein a flat portion is provided at the bottom of a recessed portion, and the area of the top surface of a raised portion, the distance between the recessed bottom and the raised top and the distance between peaks are restricted. The structure thereof is characterized in that an oil reservoir of 30 % is formed in the surface, that the area of the top surface of the raised portion ranges from 10 to 40 mu m with the distance between the recessed bottom and the raised top ranging from 2 to 20 mu m, that the distance between the peaks of the raised portions ranges from 50 to 1000 mu m, and that the area of the recessed portion is 85 % or more in the range of 2.2 < P/D < 5.