Stainless Steel Sheet for Structural Components Excellent in Impact Absorption Property

Abstract

This invention provides a steel sheet for structural components excellent in impact absorption property comprising, in mass %, C: 0.005 to 0.05%, N: 0.01 to 0.30%, Si: 0.1 to 2%, Mn: 0.1 to 15%, Ni: 0.5 to 8%, Cu: 0.1 to 5%, Cr: 11 to 20%, Al: 0.01 to 0.5%, and a balance of Fe and unavoidable impurities, wherein Md 30 value given by equation (A) is 0 to 100° C., and total impact energy absorption in dynamic tensile testing is 500 MJ/m 3 or greater: Md 30 =551−462(C+N)−9.2Si−8.1Mn−13.7Cr−29(Ni+Cu)   (A).

1 . A steel sheet for structural components excellent in impact absorption property comprising, in mass %:
 C: 0.005 to 0.05%,   N: 0.01 to 0.30%,   Si: 0.1 to 2%,   Mn: 0.1 to 15%,   Ni: 0.5 to 8%,   Cu: 0.1 to 5%,   Cr: 11 to 20%,   Al: 0.01 to 0.5%, and   a balance of Fe and unavoidable impurities,   wherein Md 30  value given by equation (A) is 0 to 100° C., and total impact energy absorption in dynamic tensile testing is 500 MJ/m 3  or greater:
   Md 30 =551−462(C+N)−9.2Si−8.1Mn−13.7Cr−29(Ni+Cu)   (A). 
   
   
   
       2 . The steel sheet for structural components excellent in impact absorption property according to  claim 1 , wherein dynamic/static ratio of yield strength is 1.4 or greater. 
   
   
       3 . The steel sheet for structural components excellent in impact absorption property according to  claim 1 , wherein tensile strength is 600 MPa or greater and elongation at break is 40% or greater in static tensile testing. 
   
   
       4 . A steel sheet for structural components excellent in impact absorption property comprising, in mass %:
 C: 0.005 to 0.05%,   N: 0.01 to 0.30%,   Si: 0.1 to 2%,   Mn: 0.1 to 15%,   Ni: 0.5 to 8%,   Cu: 0.1 to 5%,   Cr: 11 to 20%,   Al: 0.01 to 0.5%, and   a balance of Fe and unavoidable impurities,   wherein Md 30  value given by equation (A) is 0 to 100° C., and impact energy absorption to 10% strain in dynamic tensile testing is 50 MJ/m 3  or greater:
   Md 30 =551−462(C+N)−9.2Si−8.1Mn−13.7Cr−29(Ni+Cu)   (A). 
   
   
   
       5 . The steel sheet for structural components excellent in impact absorption property according to  claim 4 , wherein dynamic/static ratio of yield strength is 1.4 or greater. 
   
   
       6 . The steel sheet for structural components excellent in impact absorption property according to  claim 4 , wherein tensile strength is 600 MPa or greater and elongation at break is 40% or greater in static tensile testing. 
   
   
       7 . The steel sheet for structural components excellent in impact absorption property according to  claim 4 , wherein tensile strength is 700 MPa or greater and elongation at break is 5% or greater in static tensile testing.