Patent ID: 8709336
Filing Date: 2014-04-29
Classification: C21D,C22C

Abstract:
1. A plate of abrasion-resistant steel, the composition of said steel consisting of (by weight percent): 0.45%≦C≦0.8%; 0%≦Si≦2% and 0.025%≦Al≦2%, 0%≦Mn≦2.5%; 0%≦Ni≦5%; 0%≦Cr≦5%; 0%≦Mo≦0.50% and 0%≦W≦1.00%, 0%≦B≦0.02%; 0%≦Ti≦2% and 0%≦Zr≦4%, N≦0.03% optionally from 0% 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%, and the balance being iron and impurities resulting from the production operation, wherein the chemical composition of said steel further complying with the following relationships: said steel having a martensitic or an admixture of martensitic and bainitic microstructure, said steel further containing from 5% to 20% of retained austenite microstructure and said steel further containing coarse titanium carbides or coarse zirconium carbides said steel having a hardness from 580 HB to 650 HB; and, said plate having a surface evenness characterized by a deflection of less than 12 mm/m.