Patent ID: 7713362
Filing Date: 2010-05-11
Classification: C21D,C22C

Abstract:
1. Method for producing a plate of steel which is resistant to abrasion and whose chemical composition comprises, by weight: optionally up to 1.5% of copper, optionally at least one element selected from Nb, Ta and V at contents such that Nb/ 2+Ta/4+V≦0.5%, optionally at least one element selected from Se, Te, Ca, Bi, Pb at contents which are less than or equal to 0.1%, the balance being iron and impurities resulting from the production operation, the chemical composition further complying with the following relationships: with: K=0.5 if B≧0.0005% and K=0 if B<0.0005%, according to which the plate is subjected to a thermal quenching processing operation which is carried out in the heat for rolling in the hot state or after austenitization by reheating in a furnace, in order to carry out the quenching: the plate is cooled at a mean cooling rate greater than 0.5° C./s between a temperature greater than AC the plate is then cooled at a mean core cooling rate Vr<1150×ep the plate is cooled as far as ambient temperature and optionally planishing is carried out.