Sinter-hardening powder and their sintered compacts

Abstract

A sinter-hardening raw powder can yield a press-and-sinter compact with high hardness. The raw powder for sintering includes Fe as its primary component and also includes 0.3-0.8 wt % C, 5.0-12.0 wt % Ni, 1.0-5.0 wt % Cr, and 0.1-2.0 wt % Mo, wherein the mean particle size of the raw powder for sintering is between 50 and 100 μm. The sintered and tempered compact, without any quenching treatment, has high hardness.

1 . A raw sinter-hardening powder, comprising iron (Fe) as a primary composition and further comprising 0.3 to 0.8 wt % of Carbon (C), 5.0 to 12.0 wt % Nickel (Ni), 1.0 to 5.0 wt % chromium (Cr), and 0.1 to 2.0 wt % molybdenum (Mo), wherein a mean particle size of the raw powder for sintering is between 50 and 100 μm. 
     
     
         2 . The raw sinter-hardening powder according to  claim 1 , further comprising at least one element from among 2 wt % or less Cu, 1 wt % or less Mn, 1 wt % or less Si, and 1 wt % or less of P. 
     
     
         3 . The raw sinter-hardening powder according to  claim 2 , containing 0.5-1.5 wt % of Copper (Cu), 0.1-0.8 wt % of Manganese (Mn), and 0.1-0.8 wt % of Silicon (Si). 
     
     
         4 . The raw sinter-hardening powder according to  claim 1 , containing 0.4-0.7 wt % of Carbon (C), 6.0-10.0 wt % Nickel (Ni), 1.5-4 wt % chromium (Cr), 0.2-1.5 wt % of molybdenum (Mo). 
     
     
         5 . The raw sinter-hardening powder as cited in  claim 1 , wherein the raw powder is elemental powder or ferroalloy powder or a mixture of the two. 
     
     
         6 . A sintered compact comprising compositions of the sinter-hardening powder as cited in  claim 1 .