process for producing a sheet of galvanized steel or galvannealed regulatory guidelines for

摘要

the invention relates to a process for the manufacture of a galvanized steel sheet or a hot dip galvanizing annealing microstructure, with a trip, and said method comprising the steps of: providing a steel plate in which the composition comprises, by weight, 0.1 = c = 0.22%, 0.50 = mn = 2.0%, 0.2 = so = 2.0%, 0.005 = al = 2.0%, mo 1.0% cr = 1.0%, p 0.02% ti = 0.20%.v = 0.4%, or = 1.0%, n = 0.20%, the balance of the composition being iron and unavoidable impurities, resulting from the merger, oxidation of the steel plate in a direct flame furnace where air is the air and the fuel in a fuel air ratio of 0.80 to 0.95 in. in such a way that a layer of iron oxide having a thickness of 0.05 to 0.2 m is formed on the surface of the steel sheet, and an inner oxide - and / or mn and / or al is formed to reduce the oxidized steel sheet at a speed of 0.001 to 0.010 mm and reduction, in order to achieve a reduction of the layer of iron oxide, cement at hot dipping ladit (e) reduced steel sheet to form a zinc coated steel sheet, and, optionally,put the coated steel sheet by hot dip alloying treatment to form a rolled steel sheet by electroplating.