STP1259

    Application of Nitrogen-Alloyed Martensitic Stainless Steels in the Aviation Industry

    Published: Jan 1997


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    Abstract

    Nitrogen in stainless martensitic steels has a beneficial influence on the mechanical as well as on the chemical properties. However the effect of nitrogen is limited due to the rather low solubility of this element. A special alloy development in combination with a pressurized melting technique lead to distinctly higher nitrogen contents. Stainless martensitic steels containing high nitrogen contents are manufactured by VSG today on an industrial scale using the PESR-process (Pressurized Electroslag Remelting). Depending on special applications these steels are available with different chemical analysis under the trade mark CRONIDUR.

    The basic composition of all CRONIDUR-alloys consists of about 15% Chromium, 1% Molybdenum, 0.15 to 0.35% Carbon and 0.20 to 0.40% Nitrogen. The combination of Cr + Mo + N leads to a superior corrosion resistance of these HNS-steels (HNS: High Nitrogen Steels) in comparison to similar carbon based alloys. Focused on applications with a required minimum hardness of 58 HRC, like stainless bearings or screw shafts, the C+N-content is tuned between 0.60 to 0.80% (Brand: CRONIDUR 30). Additions of max. 0.3% Vanadium and 0.1% Niobium qualifies the brand CRONIDUR 20 for enhanced temperature applications like turbine disks or blades.

    Keywords:

    nitrogen-alloying, PESR-technique, corrosion resistance, high hardness, aerospace industry, aviation industry


    Author Information:

    Stein, G
    Member of the Board (Technology), VSG Energie- und Schmiedetechnik, Essen,

    Kirschner, W
    Head, VSG Energie- und Schmiedetechnik GmbH, Essen,

    Lueg, J
    Head, VSG Energie- und Schmiedetechnik GmbH, Hattingen,


    Paper ID: STP16596S

    Committee/Subcommittee: A01.13

    DOI: 10.1520/STP16596S


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