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High-strength maraging steel N18K9M5T (MS 200)


  1. 1.

    A strength of more than 200 kg/mm2 can be obtained in commercial melts of MS 200 steel with satisfactory plasticity (δ=8–10% in forged bars and 4–5% in plates).

  2. 2.

    MS 200 steel is considerably less susceptible to brittle fracture than other high-stength steels.

  3. 3.

    The optimal mechanical properties of MS 200 steel are obtained by air quenching from 820°C and aging 4–6 h at 480–500°C.

  4. 4.

    Reducing operations must be completed at temperatures of 900–850°C.

  5. 5.

    High mechanical properties can be obtained in maraging steels free of impurities and gases.

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Literature cited

  1. 1.

    R. Decker, J. Fash, and J. Goldman, Trans. ASM,55 (1962).

  2. 2.

    H. Smith, R. Anderson, and J. Bigham, Metal Progress,82 (1962).

  3. 3.

    M. D. Perkas, Fiz. Metal. i Metalloved., No. 4 (1963).

  4. 4.

    G. Contactor, J. Metals,18 (1966).

  5. 5.

    T. Boniszewski, J. Iron Steel Inst.,204 (1966).

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Additional information

TsNIIChERMET. Translated from Metallovedenie i Termicheskaya Obrabotka Metallov, No. 6, pp. 15–19, June, 1968.

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Beresnev, G.A., Vedernikov, G.F., Zhukov, O.P. et al. High-strength maraging steel N18K9M5T (MS 200). Met Sci Heat Treat 10, 426–430 (1968).

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  • Mechanical Property
  • Brittle
  • Brittle Fracture
  • Maraging Steel
  • High Mechanical Property