HOT-ROLLED OR COLD-ROLLED STEEL PLATE, METHOD FOR MANUFACTURING SAME, AND USE THEREOF IN THE AUTOMOTIVE INDUSTRY.

摘要

The invention relates to a hot-rolled or cold-rolled steel plate, characterised in that the composition thereof is, in weight percent: 0.6 % = C = 0.9 %; 17 % = Mn = 22 %; 0.2 % = Al = 0.9 %; 0.2 % = Si = 1.1 % with 0.85 % = Al + Si = 1.9 %; 1.2 % = Cu = 1.9 %; S = 0.030 %; P = 0.080 %; N = 0.1 %; optionally: Nb = 0.25 %, preferably between 0.070 and 0.25 %; V = 0.5 %, preferably between 0.050 and 0.5 %; Ti = 0.5 %, preferably between 0.040 and 0.5 %; Ni = 2 %; trace elements = Cr = 2 %, preferably = 1 %; B = 0.010 %, preferably between 0.0005 % and 0.010 %; the remainder being iron and impurities resulting from the production. The invention also relates to a method for manufacturing said plate and to the use of said plate in the automotive industry.