method for making hot-rolled coated steel sheet, hot-rolled coated steel sheet, method for making hot-rolled coated steel part, hot-stamped coated steel part and use of one-piece Hot Stamped Coated Steel

摘要

A method for the manufacture of a hot-rolled coated steel sheet having a thickness of between 1.8 mm and 5 mm, comprising providing a semi-product having a composition comprising: 0.04% = c = 0 , 38%, 0.40% = mn = 3%, 0.005% = si = 0.70%, 0.005% = al = 0.1%, 0.001% = cr = 2%, 0.001% = ni = 2%, 0.001% = ti = 0.2%, nb = 0.1%, b = 0.010%, 0.0005% = n = 0.010%, 0.0001% = s = 0.05%, 0.0001% = p = 0.1%, mo = 0.65%, w = 0.30%, ca = 0.006%, hot rolling with a frt final rolling temperature to obtain a hot rolled steel product having a thickness between 1,8 mm and 5 mm, cool to a take-up take-up temperature meeting: 450 ° c = take-up = take-upmax with, take-upmax being expressed in degrees celsius and f designating the austenite fraction immediately before rolling and take up to obtain a hot-rolled steel substrate, pickling and coating of the substance hot-rolled steel alloy rat or aluminum alloy by continuous hot-dip in a bath to obtain a hot-rolled coated steel plate comprising a hot-rolled steel plate and an aluminum or aluminum alloy coating, having a thickness of between 10 and 33 µm on each side of the hot-rolled steel sheet.