Shot used for blast processing

Abstract

The present disclosure relates to a shot used for blast processing, the shot being made of an iron-based alloy containing C: 0.20 to 0.50% by mass, Si: 0.50 to 1.10% by mass, and Mn: 0.50 to 1.15% by mass as additive elements, in which a mass ratio of C to Si is 0.30 to 0.75, a mass ratio of C to Mn is 0.30 to 0.75, and a mass ratio of Si to Mn is 0.70 to 1.60, and a Vickers hardness of the shot is HV 400 to 800.

1 : A shot used for blast processing,
 the shot being made of an iron-based alloy containing C: 0.20 to 0.50% by mass, Si: 0.50 to 1.10% by mass, and Mn: 0.50 to 1.15% by mass as additive elements, wherein   a mass ratio of the C to the Si is 0.30 to 0.75, a mass ratio of the C to the Mn is 0.30 to 0.75, and a mass ratio of the Si to the Mn is 0.70 to 1.60, and   a Vickers hardness of the shot is HV 400 to 800.   
     
     
         2 : The shot according to  claim 1 , wherein the total content of the C, the Si, and the Mn is 1.80 to 2.40% by mass. 
     
     
         3 : The shot according to  claim 1 , wherein the iron-based alloy further contains 0.30 to 1.0% by mass of at least one element selected from the group consisting of Cr, Ni, Cu, Mo, Al, B, V, Nb, and Ti. 
     
     
         4 : The shot according to  claim 1 , wherein the shot is substantially formed from a tempered martensite phase. 
     
     
         5 : The shot according to  claim 1 , wherein the number of particles having blowholes is 5% or less of the entire shot. 
     
     
         6 : The shot according to  claim 1 , wherein, when a length of the particle in a longitudinal direction is designated as L and a maximum diameter in a direction perpendicular to the longitudinal direction is designated as S, the number of the particles in which L/S is 2.0 or more is 5% or less of the entire shot. 
     
     
         7 : The shot according to  claim 2 , wherein the iron-based alloy further contains 0.30 to 1.0% by mass of at least one element selected from the group consisting of Cr, Ni, Cu, Mo, Al, B, V, Nb, and Ti. 
     
     
         8 : The shot according to  claim 2 , wherein the shot is substantially formed from a tempered martensite phase. 
     
     
         9 : The shot according to  claim 3 , wherein the shot is substantially formed from a tempered martensite phase. 
     
     
         10 : The shot according to  claim 2 , wherein the number of particles having blowholes is 5% or less of the entire shot. 
     
     
         11 : The shot according to  claim 3 , wherein the number of particles having blowholes is 5% or less of the entire shot. 
     
     
         12 : The shot according to  claim 4 , wherein the number of particles having blowholes is 5% or less of the entire shot. 
     
     
         13 : The shot according to  claim 2 , wherein, when a length of the particle in a longitudinal direction is designated as L and a maximum diameter in a direction perpendicular to the longitudinal direction is designated as S, the number of the particles in which L/S is 2.0 or more is 5% or less of the entire shot. 
     
     
         14 : The shot according to  claim 3 , wherein, when a length of the particle in a longitudinal direction is designated as L and a maximum diameter in a direction perpendicular to the longitudinal direction is designated as S, the number of the particles in which L/S is 2.0 or more is 5% or less of the entire shot. 
     
     
         15 : The shot according to  claim 4 , wherein, when a length of the particle in a longitudinal direction is designated as L and a maximum diameter in a direction perpendicular to the longitudinal direction is designated as S, the number of the particles in which L/S is 2.0 or more is 5% or less of the entire shot. 
     
     
         16 : The shot according to  claim 5 , wherein, when a length of the particle in a longitudinal direction is designated as L and a maximum diameter in a direction perpendicular to the longitudinal direction is designated as S, the number of the particles in which L/S is 2.0 or more is 5% or less of the entire shot. 
     
     
         17 : The shot according to  claim 1 , containing particles with the average particle size of 0.1 to 1.5 mm. 
     
     
         18 : The shot according to  claim 1 , wherein the iron-based alloy contains C: 0.30 to 0.45% by mass, Si: 0.55 to 1.05% by mass, and Mn: 0.55 to 1.00% by mass. 
     
     
         19 : The shot according to  claim 1 , wherein the mass ratio of the C to the Si is 0.35 to 0.60, the mass ratio of the C to the Mn is 0.35 to 0.60, and the mass ratio of the Si to the Mn is 0.80 to 1.40. 
     
     
         20 : The shot according to  claim 1 , wherein the total content of the C, the Si, and the Mn is 1.85 to 2.25% by mass.