COMPOSITIONS D'ACIER, PROCEDE POUR SON OBTENTION ET PIECES FABRIQUEES A PARTIR DE CES COMPOSITIONS

摘要

The invention concerns steel compositions comprising expressed in weight percentages: C 0.30-1.00 %; Si 3.00-4-50 %; Mn 7.00-10.00 %; Ni 3.50-4.50 %; Cr 20.00-27.00 %; W 0.50-4.50 %; Nb 0-2.50 %; Co 0-1.00 % N 0.20-0.50 %, the rest mainly consisting of iron and unavoidable impurities. The invention also concerns a method for obtaining same and parts made from said compositions.