Process for producing a metal sheet to be deep drawn or extra-deep drawn for the fabrication of shaped metal parts

摘要: A metal sheet which is intended to be subjected a drawing operation for the fabrication of shaped part has on its surface roughness in form plateau portions relief defining between them recessed valley portions, average ratio dimension any direction being from 1:1 3:1, preferably 3:2 5:2, 40 200 micrometers, 60 120 micrometers and height more than 6 10 25 micrometers. This reduces risk seizing during even if coated with soft such as tin. The may prepared by subjecting pressure at least one cold roller been treated, shot blasting, provide similar characteristics those just defined but 7 11 50