Abstract
Production of Kh13 steel by the HVP method without the presintering of porous blanks and final high-temperature diffusional annealing of dense compacts is possible only when an alloyed powder of the required composition is used. Use of a mixture of chromium and iron powders for the manufacture of Kh13 steel by the HVP process without additional operations — sintering of blanks and diffusional annealing of compacts does not give satisfactory results because diffusion processes cannot be completed during the short period of heating of blanks for HVP. With steel produced from an alloyed powder, the presintering of blanks and diffusional annealing of dense compacts after HVP are not essential because, while improving the mechanical characteristics of the steel, they decrease its corrosion resistance. The highest level of properties in dense P/M Kh13 steel, comparable to that characterizing cast steel of the same composition, is attainable only when a prealloyed powder is used in its manufacture. When such a powder is not available, a mixture of metallic iron and chromium powders can be employed, but the level of mechanical properties and corrosion resistance of the resultant steel will be much lower.
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