Application of nitrogen-alloyed martensitic stainless steels in the aviation industry

Conference · Wed Dec 31 04:00:00 EST 1997

OSTI ID:611605

Stein, G; Kirschner, W ^[1]; Lueg, J ^[2]

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1. VSG Energie- und Schmiedetechnik, Essen (Germany)
2. VSG Energie- und Schmiedetechnik GmbH, Hattingen (Germany)

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 trademark 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 and 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.

• OSTI ID: 611605
• Report Number(s): CONF-9611207--; ISBN 0-8031-2423-6
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
AEROSPACE INDUSTRY
CHEMICAL COMPOSITION
CORROSION RESISTANCE
MECHANICAL PROPERTIES
METALLURGICAL EFFECTS
NITROGEN ADDITIONS
STAINLESS STEELS