Cr-Mn-N austenitic stainless steel

Abstract

A Cr—Mn—N austenitic stainless steel, in which moderate manganese (Mn) and nitrogen (N) are essentially substituted for the costly nickel to produce a novel Cr—Mn—N steel, is provided, whereby reducing the cost of materials while maintaining the original physical and mechanical properties. The composition thereof includes by weight: 0.005% to 0.08% carbon, 0.3% to 0.9% silicon, 12.1% to 14.8% manganese, 0.001% to 0.04% phosphorus, 0.001% to 0.03% sulfur, 16% to 19% chromium, 0.5% to 1.8% nickel, 0.2% to 0.45% nitrogen, 0.001% to 0.3% molybdenum, 0.001% to 0.3% copper, and trace elements unavoidable in most manufacturing processes.

1 . A Cr—Mn—N austenitic stainless steel, comprising:
 0.005% to 0.08% carbon by weight;   0.3% to 0.9% silicon by weight;   12.1% to 14.8% manganese by weight;   0.001% to 0.04% phosphorus by weight;   0.001% to 0.03% sulfur by weight;   16% to 19% chromium by weight;   0.5% to 1.8% nickel by weight;   0.2% to 0.45% nitrogen by weight;   0.001% to 0.3% molybdenum by weight;   0.001% to 0.3% copper by weight; and   trace elements unavoidable in most manufacturing processes.   
     
     
         2 . The Cr—Mn—N austenitic stainless steel according to  claim 1 , comprising:
 0.0642% carbon by weight;   0.69% silicon by weight;   12.43% manganese by weight;   0.031% phosphorus by weight;   0.012% sulfur by weight;   16.87% chromium by weight;   1.21% nickel by weight;   0.45% nitrogen by weight;   0.026% molybdenum by weight;   0.106% copper by weight; and   trace elements unavoidable in most manufacturing processes.   
     
     
         3 . The Cr—Mn—N austenitic stainless steel according to  claim 1 , comprising:
 0.0547% carbon by weight;   0.81% silicon by weight;   13.92% manganese by weight;   0.01% phosphorus by weight;   0.001% sulfur by weight;   16.71% chromium by weight;   0.82% nickel by weight;   0.24% nitrogen by weight;   0.025% molybdenum by weight;   0.104% copper by weight; and   trace elements unavoidable in most manufacturing processes.   
     
     
         4 . The Cr—Mn—N austenitic stainless steel according to  claim 1 , comprising:
 0.0432% carbon by weight;   0.85% silicon by weight;   12.12% manganese by weight;   0.012% phosphorus by weight;   0.005% sulfur by weight;   16.38% chromium by weight;   0.5% nickel by weight;   0.35% nitrogen by weight;   0.027% molybdenum by weight;   0.109% copper by weight; and   trace elements unavoidable in most manufacturing processes.