Abstract
HVP and HFPB of a prealloyed powder enable high-density Kh23N18 stainless steel to be obtained exhibiting good mechanical and corrosion properties. Such steel, when produced by any of the processes investigated, is superior in strength to cast steel; its elongation and corrosion resistance are comparable to or better than those of cast steel only when additional operations of presintering of blanks and diffusional annealing after hot plastic working are employed. The mechanical and corrosion characteristics of Kh23N18 steel produced by the HVP method from a mixture of iron, chromium, and nickel metal powders are satisfactory, but appreciably poorer than those of the same steel obtained from an alloy powder. Use of a prealloyed powder with a small carbonyl nickel powder addition in the manufacture of Kh23N18 steel by the HFPB method makes it possible markedly to activate the processes taking place during the presintering and short-time heating of porous blanks for HFPB, which manifests itself in an improvement in their strength and ductility characteristics. For the production of P/M Kh23N18 steel and other sintered stainless steels of the austenitic class on an industrial scale the hot-forging method is recommended, since it requires a simpler installation and enables parts of complex configuration to be produced.
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