Composite thermostat metal

Details Composite thermostat metal Composite thermostat metal

1981-05-26

1983-11-08

Lewis, Michael L.

Stock material or miscellaneous articles

All metal or with adjacent metals

Composite; i.e., plural, adjacent, spatially distinct metal...

148 115Q, 228235, 428617, 428619, 428685, 428940, 428679, B32B 1518

Patent

active

044142862

ABSTRACT:
A composite thermostat metal having layers of metal of relatively high and relatively low coefficients of thermal expansion metallurgically bonded together has a relatively thin, corrosion-resistant layer of an austenitic stainless steel metallurgically bonded to the low expansion side of the thermostat metal, the stainless steel material being selected from the group consisting of austenitic stainless steels which undergo austenite to martensite transformation and concomitant lowering of coefficient of thermal expansion during work hardening. The stainless steel material is work hardened to a selected extent for lowering its coefficient of thermal expansion so that it cooperates with the other components of the thermostat metal in providing the thermostat metal with suitably high flexivity while also providing improved corrosion-resistance properties on the low expansion side of the thermostat metal. In one embodiment, the thermostat metal embodies a second layer of austenitic stainless steel at the opposite or high expansion side of the thermostat metal, the second layer material being selected from the group consisting of austenitic stainless steels which are characterized by relatively high coefficient of thermal expansion and are substantially free of austenite to martensite transformation during work hardening, whereby the second layer also cooperates in achieving a desired high flexivity while providing corrosion resistance properties for the high expansion side of the thermostat metal.

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patent: 4131720 (1978-12-01), Spengler
patent: 4366210 (1982-12-01), Golemo, Jr.
Peckner, D. et al., Handbook of Stainless Steels, McGraw Hill Book Co., pp. 1-6 to 9, 4-28 to 35, 12-22 to 26, 19-2 and 3, A1-54 and 55 (1977).
"Thermostat Metals" Product Bulletin, Texas Instruments Incorporated, Bull. 515-7B16-268.
"The Making, Shaping and Testing of Steel", United States Steel, printed by Herbick & Held, Pittsburgh, Pa., 1971, p. 1174.

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