The wear properties and wear surface morphology of three kinds of plastic die steel STAVAX (0.37C
13.40Cr
0.31V)
M330 (0.36C
12.88Cr
0.15Mo) and N702 (0.05C
16.30Cr
4.00Cu
4.00Ni
0.34Nb)with excellent corrosion resistance have been studied by M200 ring-block wear testing machine and scanning clectron micro-scope.Results showed that HRC value of quenched and tempered STAVAX
M330 and N702 steel was respectively 55
53 and 44
and width of wear coat was respectively 2.61 mm
2.74 mm and 7.4l mm; structure of STAVAX steel and M330 steel was matrix + fine spherical carbide and had higher wear resistance
while the matrix of N702 steel was relatively soft and there wasn't second phase - carbide precipitation which had lower wearing resistance
during testing the matrix was easily worm to form a lot of fatigue crack led to block and lamella weaing off.