| 主权项 |
1. A method for producing a stainless steel component containing the steps of:
providing a stainless steel powder having the following composition:Cr15-30%Ni 5-25%Si0.5-3.5%Mn0-2%S 0-0.6%C0.001-0.8% N≦0.3%O≦0.5%optionally up to 3% of each of the elements Mo, Cu, Nb, V, Ti andinevitable impurities up to 1%,Febalance, optionally agglomerating the stainless steel powder, optionally mixing with lubricants, hard-phase materials, machinability enhancing agents and graphite, optionally transforming the powder into a suitable paste or feedstock, consolidating the obtained paste, feedstock or powder into a green component, heating the obtained green component in vacuum or in an atmosphere of hydrogen gas to a temperature of at least 1100° C. sintering the green component at a temperature between 1150-1350° C. in an atmosphere of at least 20% nitrogen gas. cooling the sintered component at a cooling rate of at most 30° C./min from the sintering temperature to a temperature of ≧1100° C. in an atmosphere of at least 20% nitrogen gas to form sufficient amount of M2(C, N) carbo-nitrides, cooling the sintered component from 1100° C. to ambient temperature at a cooling rate of at least 30° C./min and sufficiently high enough to avoid excessive formation of M(C,N) carbo nitrides yielding a component having at least 12% by weight of Cr in the matrix. |
