The modified containing tungsten added V-N microalloying Cr5W tool steel-0.70~0.90C,≤1.00Si,0.20~0.60Mn,4.50~5.50Cr,1.00~1.50W,≤0.15Mo,≤0.3V,300×10
-6
~350×10
-6
N has been developed. Test results indicated that the structure of modified Cr5W steel quenched at 960 ℃ was martensite + carbide
of which the average HRC hardness was 63.5
and the average HRC hardness of modified Cr5W steel after temper at 180 ℃ was 63.2 higher than hardness(average HRC 62.3)of 180 ℃ tempered Cr5 steel(0.70~0.90C,≤1.00Si,0.20~0.60Mn,4.50~5.50Cr,0.15~0.70Mo,with 80×10
-6
~120×10
-6
N);and with same hardness value the relative wearing resistance of modified Cr5W steel increased by 50% as compared with that of Cr5 steel.