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Development of an ultra-high-strength low-alloy NiSiCrCoMo steel

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Abstract

An ultra-high-strength low-alloy NiSiCrCoMo steel has been developed. The development work is part of a major programme at the Defence Metallurgical Research Laboratory in the field of ultra-high-strength, high-fracture-toughness steels. In this context we undertook investigations to understand the effect of solute additions on the fracture behaviour of Armco iron and Fe-C alloys. We investigated Fe-Ni, Fe-Co, Fe-Si, Fe-Mo, Fe-C-Ni and Fe-C-Co alloys for mechanical behaviour. The report by Garrison (1986) on a Fe-C-Ni-Si-Cr alloy was an important pointer to a low-alloy, ultra-high-strength steel with high fracture toughness. The material we have now arrived at is a Fe-C-Ni-Si-Cr-Co-Mo steel with tensile, impact and fracture toughness properties matching those of maraging steel 250 grade in tonnage scale melts.

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Authors and Affiliations

  1. Defence Metallurgical Research Laboratory, 500 258, Kanchanbagh, Hyderabad, India

    G Malakondaiah, M Srinivas, J Marthanda Murthy & P Rama Rao

  2. Jawaharlal Nehru Centre for Advanced Scientific Research, IISc Campus, 560 012, Bangalore, India

    P Rama Rao

Authors
  1. G Malakondaiah
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  2. M Srinivas
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  3. J Marthanda Murthy
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  4. P Rama Rao
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Malakondaiah, G., Srinivas, M., Marthanda Murthy, J. et al. Development of an ultra-high-strength low-alloy NiSiCrCoMo steel. Bull. Mater. Sci. 17, 73–86 (1994). https://doi.org/10.1007/BF02747636

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  • DOI: https://doi.org/10.1007/BF02747636

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