Development of CSS-42L{trademark}, a high performance carburizing stainless steel for high temperature aerospace applications

Conference · Thu Dec 31 04:00:00 EST 1998

OSTI ID:316180

Burrier, H I; Milam, L ^[1]; Tomasello, C M; Balliett, S A; Maloney, J L ^[2]; Ogden, W P ^[3]

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1. Timken Co., Canton, OH (United States)
2. Latrobe Steel Co., Latrobe, PA (United States)
3. MPB Corp., Lebanon, NH (United States)

Today`s aerospace engineering challenges demand materials which can operate under conditions of temperature extremes, high loads and harsh, corrosive environments. This paper presents a technical overview of the on-going development of CSS-42L (US Patent No. 5,424,028). This alloy is a case-carburizable, stainless steel alloy suitable for use in applications up to 427 C, particularly suited to high performance rolling element bearings, gears, shafts and fasteners. The nominal chemistry of CSS-42L includes: (by weight) 0.12% carbon, 14.0% chromium, 0.60% vanadium, 2.0% nickel, 4.75% molybdenum and 12.5% cobalt. Careful balancing of these components combined with VIM-VAR melting produces an alloy that can be carburized and heat treated to achieve a high surface hardness (>58 HRC at 1mm (0.040 in) depth) with excellent corrosion resistance. The hot hardness of the carburized case is equal to or better than all competitive grades, exceeding 60 HRC at 427 C. The fracture toughness and impact resistance of the heat treated core material have likewise been evaluated in detail and found to be better than M50-NiL steel. The corrosion resistance has been shown to be equivalent to that of 440C steel in tests performed to date.

• OSTI ID: 316180
• Report Number(s): CONF-9611259--; ISBN 0-8031-2421-X
• Country of Publication: United States
• Language: English

Related Subjects

33 ADVANCED PROPULSION SYSTEMS
36 MATERIALS SCIENCE
AEROSPACE INDUSTRY
BEARINGS
CHEMICAL COMPOSITION
CORROSION RESISTANCE
FASTENERS
FRACTURE PROPERTIES
GEARS
IMPACT STRENGTH
MECHANICAL SHAFTS
STAINLESS STEELS
SURFACE HARDENING