Nonmagnetic steels having low thermal expansion coefficients and high yield points
US4373951A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 15, 1980 |
| Grant date | Feb 15, 1983 |
| Priority date | — |
| Expiry date | Oct 15, 2000 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC21D7/13
- 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. EQU Mn (%)>16.times.C (%)+18 EQU 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.