High strength, air-hardening steel with excellent shaping properties

Abstract

The invention relates to a high strength, air-hardening, temper-resistant steel, which can easily be welded and galvanized and exhibits excellent shaping properties, particularly for the construction of lightweight vehicles. The inventive steel comprises the following elements (contents in mass %): C0.07 to ≦0.15, Al≦0.05, Si 0.15 to ≦0.30, Mn 1.60 to ≦2.10, P≦0.020, S≦0.010, N 0.0030 to ≦0.0150, Cr 0.50 to ≦1.0, Mo 0.30 to ≦0.60, Ti 0.010 to ≦0.050, V 0.12 to ≦0.20, B 0.0015 to ≦0.0040, remainder iron including incidental steel-accompanying elements.

1 . A high strength, air-hardening, temper-resistant steel suitable for welding and galvanizing, comprising the elements (contents in mass-%): 
     
       
         
               
               
               
             
                   
                   
               
                   
                 C 
                 0.07 to ≦0.15 
               
                   
                 Al 
                 ≦0.05 
               
                   
                 Si 
                 0.15 to ≦0.30 
               
                   
                 Mn 
                 1.60 to ≦2.10 
               
                   
                 P 
                 ≦0.020 
               
                   
                 S 
                 ≦0.010 
               
                   
                 N 
                 0.0030 to ≦0.0150 
               
                   
                 Cr 
                 0.50 to ≦1.0 
               
                   
                 Mo 
                 0.30 to ≦0.60 
               
                   
                 Ti 
                 0.010 to ≦0.050 
               
                   
                 V 
                 0.12 to ≦0.20 
               
                   
                 B 
                 0.0015 to ≦0.0040, 
               
                   
                   
               
           
              
             
             
              
              
              
              
              
              
              
              
              
              
              
              
              
             
          
         
       
     
     remainder iron including incidental steel-accompanying elements. 
   
   
       2 . The steel of  claim 1 , wherein the steel has a C content of 0.08 to ≦0.10%. 
   
   
       3 . The steel of  claim 1 , wherein the steel has a Si content of 0.20 to ≦0.30%. 
   
   
       4 . The steel of  claim 1 , wherein the steel has a Mn content of 1.80 to ≦2.0%. 
   
   
       5 . The steel of  claim 1 , wherein the steel has a N content of 0.0030 to ≦0.0125%. 
   
   
       6 . The steel of  claim 5 , wherein the steel has a N content of 0.0030 to ≦0.00805%. 
   
   
       7 . The steel of  claim 1 , wherein the steel has Cr content of 0.70 to ≦0.80%. 
   
   
       8 . The steel of  claim 1 , wherein the steel has a Mo content of 0.40 to ≦0.50%. 
   
   
       9 . The steel of  claim 1 , wherein the steel has a Ti content of 0.02 to ≦0.03%. 
   
   
       10 . The steel of  claim 1 , wherein the steel has a V content of 0.13 to ≦0.17%. 
   
   
       11 . The steel of  claim 1 , wherein the steel has a B content of 0.0025 to ≦0.0035%.