DEVELOPMENT OF A CORROSION-RESISTANT BEARING STEEL FOR SERVICE IN AIRCRAFT AT TEMPERATURES UP TO 1000 F. Period covered : April 1958 to July 1959. Project title: METALLIC MATERIALS. Task title: REFRACTORY METALS
Corrosion resistance has been added to the high initial hardness, adequate temper resistance (600 to 900 deg F), and good dimensional stability of a high-speed type bearing alloy. To produce secondary hardening, the base composition of a quench hardenable stainless steel, 440C, was modified with V, W, Mo, and Co. The following composition is recommended for use as a stainless bearing steel for 500 hr of operation up to 900 deg F. 1.10 to 1.15% C, 0.15% max Mn, 0.15% max Si, 135 to 14.5% Cr, 2.5 tc 3.0% V, 2.0 tc 2.5% W, 3.75 to 4.25% Mo, and 5.0 to 5.5% Co. For best performance, the steel should be heat-treated as follows: heat to 2200 deg F, oil quench, and refrigerate to - 105 deg F. Rockwell "C" 66 is achieved (2% retained austenite) by tempering the steel for 1 + 1 + 2 hr at 1000 deg F with intermediate subzero cooling after the first and second draws. Tempering twice for 2 hr at 1000 deg F also results in a useful structure. After 500 hr at 900 deg F the hardness drops to Rr 65 (hot hardness of R/sub c/ 57), and the structure contracts 13 mu in-/inAfter three cycles of a water-vapor corrosion test, the sunface of fully heat-treated WADC66 is only slightly more pitted than that of annealed 430 stainless steel. (auth)
- Research Organization:
- Crucible Steel Co. of America, Pittsburgh
- DOE Contract Number:
- AF33(616)-5428
- NSA Number:
- NSA-14-006620
- OSTI ID:
- 4207550
- Report Number(s):
- WADC-TR-59-390
- Resource Relation:
- Other Information: Orig. Receipt Date: 31-DEC-60
- Country of Publication:
- United States
- Language:
- English
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