Method of manufacturing non-magnetic Fe-Mn steels having low thermal expansion coefficients and high yield points
US4256516A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 18, 1979 |
| Grant date | Mar 17, 1981 |
| Priority date | — |
| Expiry date | Dec 18, 1999 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC22C38/04
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
Low nonmagnetic steel having a thermal expansion coefficient of 1.0.about.1.3.times.10.sup.-5 /.degree.C. and a high yielding point of higher than 36 Kg/mm.sup.2 consists of less than 0.5% by weight of C, less than 2% by weight of Si, 20.about.30% by weight of Mn, and 0.005.about.0.04% by weight of N and the balance of iron and impurities, wherein the following relationships between the amounts of C and Mn are simultaneously satisfied. PA1 Mn(%)>16.times.C(%)+18 PA1 Mn(%)>-12.times.C(%)+21.5 The steel described above is heated to a temperature of less than 1220.degree. C., and then hot rolled. A finishing rolling temperature is maintained to be less than 800.degree. C.+400.degree. C..times.C(%) depending upon the amount of carbon. After cold working the nonmagnetic steel has a permeability of less than 1.1.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.