Corrosion-Resistant Austenitic Steel

Abstract

A corrosion-resistant austenitic steel is claimed which, in each case relative to 100 mass percent, contains 20 to 32% manganese, 10 to 15% chromium, a total of 0.5 to 1.3% carbon and nitrogen, wherein the ratio of carbon to nitrogen is 0.5 to 1.5, the remainder being iron and melt-related impurities. The claimed steel can be produced and processed at normal pressure and has TWIP properties. It is in particular suited for producing structural components in constructs, such as in the automotive industry.

1 - 15 . (canceled) 
     
     
         16 . A corrosion-resistant austenitic steel comprising, in addition to iron, in percent by weight based on 100 percent by weight of the steel:
 20 to 32% of manganese,   10 to 15% of chromium,   a total of 0.5 to 1.3% carbon and nitrogen, wherein the ratio of carbon to nitrogen is 0.5 to 1.5, and   melt-related impurities.   
     
     
         17 . The corrosion-resistant austenitic steel according to  claim 16 , further comprising alloying components selected from the group consisting of Mo, Si, Nb, Hf, V, Zr, Ti, Nd, and Co. 
     
     
         18 . The corrosion-resistant austenitic steel according to  claim 17 , wherein Mo is contained in a quantity of 1.0 percent by weight to 2.0 percent by weight. 
     
     
         19 . The corrosion-resistant austenitic steel according to  claim 17 , wherein Si is contained in a quantity of 0.1 percent by weight to 2.0 percent by weight. 
     
     
         20 . The corrosion-resistant austenitic steel according to  claim 17 , wherein Nb is contained in a quantity of 0.02 percent by weight to 0.1 percent by weight. 
     
     
         21 . The corrosion-resistant austenitic steel according to  claim 17 , wherein Hf, V, Zr, Ti, and Nd each are contained in a quantity of up to 0.5 percent by weight. 
     
     
         22 . The corrosion-resistant austenitic steel according to  claim 16 , wherein manganese is contained in a quantity of 22 percent by weight to 30 percent by weight. 
     
     
         23 . The corrosion-resistant austenitic steel according to  claim 16 , wherein chromium is contained in a quantity of 11.0 percent by weight to 13.0 percent by weight. 
     
     
         24 . The corrosion-resistant austenitic steel according to  claim 16 , wherein carbon and nitrogen are contained in total in a quantity of 0.5 percent by weight to 0.8 percent by weight and wherein the ratio of carbon to nitrogen is between 0.5 and 0.8. 
     
     
         25 . The corrosion-resistant austenitic steel according to  claim 16  having TWIP properties. 
     
     
         26 . The corrosion-resistant austenitic steel according to  claim 16  having a tensile strength of >900 MPa. 
     
     
         27 . The corrosion-resistant austenitic steel according to  claim 16  having a tensile elastic limit of >400 MPa and an elongation at fracture of >90%. 
     
     
         28 . A method for producing a corrosion-resistant austenitic steel, the method comprising the steps of:
 melting alloying metals at normal pressure,   annealing the alloying metals in a temperature range between 1,000° C. and 1,250° C. for a duration of 1 to 72 hours, and   quenching the alloying metals.   
     
     
         29 . The method according to claim  13 , further comprising, subsequent to quenching, a deformation step employing hot deforming; cold deforming; or hot deforming and cold deforming. 
     
     
         30 . A method for producing structural components, the method comprising the step of providing a corrosion-resistant austenitic steel according to  claim 16 .