ArcelorMittal S.A.
METHOD FOR MANUFACTURE OF A PRE-COATED STEEL SHEET

Abstract:

A method for manufacture of a pre-coated steel sheet includes providing a steel sheet, coating the steel sheet with a metallic coating, the metallic coating including: 2.0 to 24.0% by weight of zinc; 1.1 to 7.0% by weight of silicon; optionally from 0.5 to 3.0% by weight of magnesium when the amount of silicon is between 1.1 and 4.0%, and optionally additional elements chosen from Pb, Ni, Zr or Hf, a content by weight of each additional element being less than 0.3% by weight, a balance of the metallic coating being aluminum, unavoidable impurities and residual elements resulting from feeding ingots or from a passage of the steel sheet in a molten bath; a ratio Al/Zn by weight greater than 2.9, and wherein the metallic coating does not include In and the metallic coating does not include Sn