Metal Science and Heat Treatment

, Volume 41, Issue 6, pp 250–252 | Cite as

Use of carbonitriding for self-sharpening of tools in service

  • L. P. Karpov
Chemicothermal Treatment


  1. 1.

    Carbonitriding at 800°C and heat treatment of flat blades of supershears and guillotines from steel 40Kh with subsequent grinding of the faces to a specific depth provides self-sharpening of the blades in operation.

  2. 2.

    In order to provide a self-sharpening regime after the creation of the diffusion layer on the faces of a blade and a hardening heat treatment, a part of the layer of the “soft” face is ground off to a hardness much lower than that of the surface of the “hard” face.

  3. 3.

    The structural strength of the blades is provided by optimum regimes of carbonitriding, quenching; and double tempering and raising the toughness of the “soft” face by a partial removal of the surface “hard” layer.



Tace Diffusion Layer Impact Toughness Structural Strength Steel 40Kh 
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  1. 1.
    V. N. Tkachev, B. M. Fishtein, V. D. Vlasenko, and V. A. Ulanov,Methods for Increasing the Service Life of Machine Parts [in Russian], Mashinostroenie, Moscow (1971).Google Scholar
  2. 2.
    L. P. Karpov, “Carbonitriding with the use of triethanolamine at 800°C,”Metalloved. Term. Obrab. Met., No. 2, 8–12 (1998).Google Scholar
  3. 3.
    A Method for Carbonitriding Steel. RF Patent No. 2082820. 27.06.97 [in Russian].Google Scholar
  4. 4.
    V. D., Kal'ner (ed.),Control over the Quality of Heat Treatment of Steel Semiproducts and Parts. A Handbook [in Russian], Mashinostroenie, Moscow (1984).Google Scholar

Copyright information

© Kluwer Academic/Plenum Publishers 1999

Authors and Affiliations

  • L. P. Karpov
    • 1
  1. 1.Elektrokhimpribor WorksLesnoyRussian

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