Piston ring material for internal combustion engine

Abstract

A piston ring material that when formed into a piston ring product, maintains excellent properties, and that at the production of piston ring rod, realizes excellent processability and shape stability. There is provided a piston ring material for internal combustion engine comprising, by mass, 0.5 to less than 0.7% C, 1.0% or less Si, 1.0% or less Mn, 12.0 to 16.0% Cr, 3.0% or less Mo and/or W (Mo+1/2W), 0.02 to 0.14% N and the balance Fe and unavoidable impurities, wherein the relationship of contained C, N and Cr satisfies the formulae: 25≦43.22C (%)+42.45N (%)−0.02Cr (%)<40, and 0.15 <0.92C (%)+0.67N (%)−0.03Cr (%)<0.30.

1 . A piston ring material for internal combustion engine which contains, by mass, 0.5% or more and less than 0.7% of C, 1.2% or less of Si, 1.0% or less of Mn, 12.0-16.0% of Cr, 3.0% or less of Mo and/or W (Mo+1/2W), and 0.02-0.14% of N, with the balance Fe and unavoidable impurities, wherein the relationship of the contained C, N and Cr satisfies the formulas of 25≦43.22C (%)+42.45N (%)−0.02Cr (%)≦40 and 0.15≦0.92C (%)+0.67N (%)−0.03Cr (%)≦0.30. 
   
   
       2 . The piston ring material for internal combustion engine according to  claim 1 , wherein C is contained in an amount of 0.60-0.68% by mass. 
   
   
       3 . The piston ring material for internal combustion engine according to  claim 1 , wherein Cr is contained in an amount of 14.0-16.0% by mass. 
   
   
       4 . The piston ring material for internal combustion engine according to  claim 1 , wherein N is contained in an amount of 0.04-0.13% by mass. 
   
   
       5 . The piston ring material for internal combustion engine according to  claim 1 , wherein the relationship of the contained C, Cr and N by mass % satisfies the formulas of 29≦43.22C (%)+42.45N (%)−0.02Cr (%)≦35. 
   
   
       6 . The piston ring material for internal combustion engine according to  claim 1 , wherein the relationship of the contained C, Cr and N by mass% satisfies the formulas of 0.18≦0.92C (%)+0.67N (%)−0.03Cr (%)≦0.30. 
   
   
       7 . The piston ring material for internal combustion engine according to  claim 1 , wherein Mo and/or W (Mo+1/2W) are contained in an amount of more than 1.5% and 3.0% or less by mass. 
   
   
       8 . The piston ring material for internal combustion engine according to  claim 1 , wherein Mo and/or W (Mo+1/2W) are contained in an amount of 1.6-2.5% by mass. 
   
   
       9 . The piston ring material for internal combustion engine according to  claim 1 , wherein Mo is selected from Mo and/or W. 
   
   
       10 . The piston ring material for internal combustion engine according to  claim 1 , wherein Si is contained in an amount of 0.1-1.0% by mass. 
   
   
       11 . (canceled) 
   
   
       12 . The piston ring material for internal combustion engine according to  claim 7 , wherein Mo is selected from Mo and/or W. 
   
   
       13 . The piston ring material for internal combustion engine according to  claim 8 , wherein Mo is selected from Mo and/or W. 
   
   
       14 . A piston ring material for internal combustion engine which contains, by mass, 0.60-0.68% of C, 0.1-1.0% of Si, 1.0% or less of Mn, 14.0-16.0% of Cr, 1.6-2.5% of Mo, and 0.04-0.13% of N, with the balance Fe and unavoidable impurities, wherein the relationship of the contained C, Cr and N satisfies the formulas of 29≦43.22C (%)+42.45N (%)−0.02Cr (%)≦35 and 0.18≦0.92C (%)+0.67N (%)−0.03Cr (%)≦0.30.