Patent ID: 7998285

Claim:
A resistant to abrasion plate made of steel whose chemical composition comprises, by weight: 0.1%≦C<0.23% 0%≦Si≦2% 0%≦Al≦2% 0.5%≦Si+Al≦2% 0%≦Mn≦2.5% 0%≦Ni≦5% 0%≦Cr≦5% 0%≦Mo≦1% 0%≦W≦2% 0.05%≦Mo+W/2≦1% 0%≦B≦0.02% 0%≦Ti≦0.67% 0%≦Zr≦1.34% 0.05%≦Ti+Zr/2≦0.67% 0%≦S≦0.005% 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%, the balance being iron and impurities resulting from the production operation, the chemical composition further complying with the following relationships: C−Ti/4−Zr/8+7×N/8≧0.095% and: Ti+Zr/2−7×N/2>0.05% and 1.05×Mn+0.54×Ni+0.50×Cr+0.3×(Mo+W/2) 1/2 +K>1.8 with: K=1 if B≧0.0005% and K=0 if B<0.0005%, the steel having a martensitic or martensitic/bainitic structure, the structure containing coarse titanium carbides and optionally coarse niobium and/or coarse vanadium carbides, and from 5% to 20% of retained austenite.