Low thermal expansion alloy
US11371123B2 · kind B2 · utility
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Key dates
| Filing date | Aug 24, 2018 |
| Grant date | Jun 28, 2022 |
| Priority date | — |
| Expiry date | Dec 3, 2038 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC21D6/00
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
Provided is a low thermal expansion alloy wherein martensitic transformation does not occur even at −120° C. This low thermal expansion alloy contains, in mass %, 1.50-5.00% of Co, while containing Ni in such an amount that if [Ni] (mass %) is the content of Ni and [Co] (mass %) is the content of Co, [Co]≥−4×[Ni]+136 and [Co]≤−4×[Ni]+139 are satisfied, with the balance being made up of Fe and unavoidable impurities. This low thermal expansion alloy has an average thermal expansion coefficient of 0.5×10−6/° C. or less for the range of 0-30° C., while having a martensitic transformation temperature of −120° C. or less.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.