Abstract
1. Alloying of steel with a large quantity of carbide-forming elements leads to an increase in the resistance of martensite to tempering and precipitation of special carbides at higher tempering temperatures. 2. The embrittlement of steels of the 20Kh3MVF and 25KhMF type during tempering at 500–650°, which is due to precipitation of special carbides in the boundaries of prior austenite grains, occurs by a mechanism of the irreversible temper brittleness type. 3. Steels of the 20Kh3MVF type should not be tempered at temperatures below 680°, which ensure a yield strength not over 65 kgf/mm2. A higher strength produced by lowering the tempering temperature is undesirable, since it may lead to embrittlement.
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