The range of reversible temper brittleness is 400–600°C for steels without molybdenum. Embrittlement is greatest at 460–550°C. Raising the nickel content has no effect on the limits of this range, but the degree of embrittlement increases.
Alloying of the steel with molybdenum sharply reduces the degree of embrittlement and narrows the range of reversible temper brittleness to 425–575°C.
Changing the nickel content (0.5, 1, 2%) and molybdenum content (0, 0.25, 0.5%) has no effect on the temperature of maximum embrittlement. It amounts to 500°C for the quenched and tempered Cr−Ni and Cr−Ni−Mo structural steels investigated.
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Taran, A.V., Zikeev, V.N. The range of reversible temper brittleness of structural steels with molybdenum and nickel. Met Sci Heat Treat 14, 1000–1001 (1972). https://doi.org/10.1007/BF00652002
- Structural Steel
- Nickel Content