Raising the manganese content to 3.5% has no effect on the strength, ductility, or toughness of steel 25Kh23N7SL, lowers the amount of δ ferrite somewhat, stabilized the γ solid solution during isothermal heating, and extends the range in which σ phase is stable to lower temperatures.
Raising the silicon content to 3.2% increases the hardness, sharply reduces the ductility and toughness, promotes the formation of σ phase during isothermal heating, and extends the region in which σ phase exists to lower temperatures.
Raising the nickel content from 4.5 to 7.5% increases the ductility and toughness of the steel, stabilizes the γ solid solution during isothermal heating, and extends the range in which σ phase is stable to higher temperatures.
The structural and mechanical properties are most stable for the steel with 6.5–7.5% Ni with not over 1.2% Si and no more than 1% Mn.
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V. G. D'yakov and Z. A. Abramova, Metal. i Term. Obrabotka Metal., No. 1 (1966).
All-Union Scientific-Research Institute of Petroleum Machinery. I. M. Gubkin Moscow Institute of the Petrochemical and Gas Industry. Translated from Metallovedenie i Termicheskaya Obrabotka Metallov, No. 3, pp. 30–33, March, 1972.
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D'yakov, V.G., Abramova, Z.A. & Efremov, N.N. Structure and properties of cast Cr−Ni steel with different nickel, silicon, and manganese concentrations. Met Sci Heat Treat 14, 215–218 (1972). https://doi.org/10.1007/BF00690767
- Mechanical Property