Steel for making acid-gas resistant part

Abstract

A steel for making acid-gas resistant parts for power generation, pipes, tanks, pipelines for gases or other fluids, for parts in contact with hydrogen, bipolar plates of fuel cells and heat exchangers. The high-manganese austenitic steel. The steel has in weight percent 0.02 to 0.12% carbon, 0.05 to 0.5% nitrogen, 10 to 20% manganese, 10 to 20% chromium, and remainder iron with usual impurities.

I claim: 
     
         1 . A method of making steel for acid-gas resistant parts for power generation, pipes, tanks, pipelines for gases or other fluids, for parts in contact with hydrogen, bipolar plates of fuel cells and heat exchangers, the high-manganese austenitic steel of the parts comprising in weight percent:
 0.02 to 0.12% carbon,   0.05 to 0.5% nitrogen,   10 to 20% manganese,   10 to 20% chromium, and   remainder iron with usual impurities.   
     
     
         2 . The method of making steel according to  claim 1 , further comprising:
 up to 0.8% silicon,   up to 4% nickel,   up to 2% molybdenum,   a maximum of 0.05% phosphorus,   not more than 0.05% sulfur,   up to 0.5% titanium,   up to 0.5% niobium, and   up to 0.5% vanadium.   
     
     
         3 . The method of making steel according to  claim 1 , wherein the steel has:
 a tensile strength R m =500 to 800 mpa,   a yield strength R p 0.2=200 to 500 mpa, and   a stretch to break A80=at least 42%.   
     
     
         4 . The method of making steel according to  claim 1 , wherein the steel is cold shaped solely by using a TWIP mechanism alone and contains less than 5% deformation-indexed martensite. 
     
     
         5 . The method of making steel according to  claim 1 , wherein technological properties of the steel material are determined by rolling the material with a suitable degree of rolling and/or annealing the material at a suitable annealing temperature. 
     
     
         6 . A steel for making acid-gas resistant parts for power generation, pipes, tanks, pipelines for gases or other fluids, for parts in contact with hydrogen, bipolar plates of fuel cells and heat exchangers, the high-manganese austenitic steel, the steel comprising in weight percent:
 0.02 to 0.12% carbon,   0.05 to 0.5% nitrogen,   10 to 20% manganese,   10 to 20% chromium, and   remainder iron with usual impurities.