Cold die steel excellent in characteristic of suppressing dimensional change

Abstract

A cold die steel excellent in the characteristic of suppressing dimensional change, which has a chemical composition in mass %: C: 0.7% or more and less than 1.6%, Si: 0.5 to 3.0%, Mn: 0.1 to 3.0%, P: less than 0.05% including 0%, S: 0.01 to 0.12%, Cr: 7.0 to 13.0%, one or two elements selected from the group consisting of Mo and W: amounts satisfying the formula (Mo+(W/2))=0.5 to 1.7%, V: less than 0.7% including 0, Ni: 0.3 to 1.5%, Cu: 0.1 to 1.0% and Al: 0.1 to 0.7%. Preferably, the die steel satisfies the formula in mass %: Ni/Al=1 to 3.7. It is preferred that the die steel also satisfies the following formula in mass %: (Cr−4.2 ×C)=5 or less and (Cr−6.3×C)=1.4 or more and that it contains 0.3% or less of Nb.

1 . A cold die steel excellent in characteristics of suppressing dimensional change, including, by mass %, 
 carbon (C): 0.7% or more and less than 1.6%,    silicon (Si): 0.5 to 3.0%,    manganese (Mn): 0.1 to 3.0%,    phosphor (P): less than 0.05% including 0%,    sulfur (S): 0.01 to 0.12%,    chromium (Cr): 7.0 to 13.0%,    one or two elements selected from the group consisting of molybdenum (Mo) and tungsten (W): amounts satisfying the formula: (Mo+(W/2))=0.5 to 1.7%,    vanadium (V): less than 0.7% including 0%,    nickel (Ni): 0.3 to 1.5%,    cupper (Cu): 0.1 to 1.0%, and    aluminum (Al): 0.1 to 0.7%.    
   
   
       2 . The cold die steel according to  claim 1 , wherein amounts of nickel and aluminum satisfy the formula by mass %: Ni/Al=1 to 3.7.  
   
   
       3 . The cold die steel according to  claim 1 , wherein amounts of chromium and carbon satisfy the formulas by mass %: (Cr−4.2×C)=5 or less, and (Cr−6.3×C)=1.4 or more.  
   
   
       4 . The cold die steel according to  claim 1 , wherein the steel further includes, by mass %, 0.3% or less excluding 0% of columbium (Nb).  
   
   
       5 . A cold die steel excellent in characteristics of suppressing dimensional change including, by mass %, 
 carbon (C): 0.7% or more and less than 1.6%,    silicon (Si): 0.5 to 3.0%,    manganese (Mn): 0.1 to 3.0%,    phosphor (P): less than 0.05% including 0%,    sulfur (S): 0.01 to 0.12%,    chromium (Cr): 7.0 to 13.0%,    one or two elements selected from the group consisting of molybdenum (Mo) and tungsten (W): amounts satisfying the formula: (Mo+(W/2))=0.5 to 1.7%,    vanadium (V): less than 0.7% including 0%,    nickel (Ni): 0.3 to 1.5%,    cupper (Cu): 0.1 to 1.0%,    aluminum (Al): 0.1 to 0.7%, and    columbium (Nb): 0.3% or less excluding 0%,    wherein amounts of nickel and aluminum satisfy the formula: Ni/Al=1 to 3.7, and    wherein amounts of chromium and carbon satisfy the formulas: (Cr−4.2×C)=5 or less, and (Cr−6.3×C)=1.4 or more.