Cold-work die steel and die

Abstract

The present invention relates to a cold-work die steel, comprising by mass %: 0.5 to 0.7% of C; 0.5 to 2.0% of Si; 0.1 to 2.0% of Mn; 5 to 7% of Cr; 0.01 to 1.0% of Al; 0.003 to 0.025% of N; 0.25 to 1% of Cu; 0.25 to 1% of Ni; 0.5 to 3% of Mo; 2% or less (including 0%) of W; and 0.1% or less (excluding 0%) of S, with a remainder being iron and an unavoidable impurity; wherein the following requirements (1) to (3) are satisfied: (1) [Cr]×[C]≦4; (2) [Al]/[N]: 1 to 30; and (3) [Mo]+0.5×[W]: 0.5 to 3.00%, wherein the bracket means a content (%) of an element written therein.

1 . A cold-work die steel, comprising by mass %:
 0.5 to 0.7% of C;   0.5 to 2.0% of Si;   0.1 to 2.0% of Mn;   5 to 7% of Cr;   0.01 to 1.0% of Al;   0.003 to 0.025% of N;   0.25 to 1% of Cu;   0.25 to 1% of Ni;   0.5 to 3% of Mo and 2% or less (including 0%) of W; and   0.1% or less (excluding 0%) of S,   with a remainder being iron and an unavoidable impurity;   wherein the following requirements (1) to (3) are satisfied:
   [Cr]×[C]≦4;  (1) 
   [Al]/[N]: 1 to 30; and  (2) 
   [Mo]+0.5×[W]: 0.5 to 3.00%,  (3) 
   wherein the bracket means a content (%) of an element written therein.   
     
     
         2 . The cold-work die steel according to  claim 1 , further comprising at least one of the following (a) to (c):
 (a) V in a content of 0.5% or less (excluding 0%);   (b) at least one element selected from the group consisting of Ti, Zr, Hf, Ta and Nb in a total content of 0.5% or less (excluding 0%); and   (c) Co in a content of 10% or less (excluding 0%).   
     
     
         3 - 4 . (canceled) 
     
     
         5 . A die obtained by using the cold-work die steel according to  claim 1 . 
     
     
         6 . A die obtained by using the cold-work die steel according to  claim 2 .