Aqueous quenching media and use thereof in quenching metal substrates
US9803255B2 · kind B2 · utility
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18Claims
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Key dates
| Filing date | May 13, 2014 |
| Grant date | Oct 31, 2017 |
| Priority date | — |
| Expiry date | Aug 22, 2035 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC21D1/56
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
Aqueous media for quenching metal substrates are provided and contain (i) a polyvinylpyrrolidone/polyvinylcaprolactam copolymer and (ii) one or more of a second polymer, which is selected from (a) a substituted oxazoline polymer; (b) a poly(oxyethylene-oxyalkylene)glycol; or (c) a polyvinylpyrrolidone polymer. The quenching bath provides reduced cooling rates through the martensite temperature ranges. Also provided are processes for quenching metal substrates using these quenching media.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.