Composite magnetic member, process for producing the member and electromagnetic valve using the member
US5865907A · kind A · utility
Assignees
Inventors
Key dates
| Filing date | Jun 17, 1994 |
| Grant date | Feb 2, 1999 |
| Priority date | — |
| Expiry date | Jun 17, 2014 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S428/90
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A metallic member including not more than 0.6% C, 12 to 19% Cr, 6 to 12% Ni, not more than 2% Mn, not more than 2% Mo, not more than 1% Nb and the balance being Fe and inevitable impurities, where Hirayama's equivalent H eq=Ni %!+1.05 Mn %!+0.65 Cr %!+0.35 Si %!+12.6 C %! is 20 to 23%; Nickel equivalent Ni eq=Ni %!+30 C %!+0.5 Mn %! is 9 to 12%, and Chromium equivalent Cr eq=Cr %!+Mo %!+1.5 Si %!+0.5 Nb %! is 16 to 19, wherein % is by weight, is made to have at least one ferromagnetized part having a magnetic flux density B.sub.4000 of not less than 0.3 T and at least one non-magnetized part having a relative magnetic permeability .mu. of not more than 1.2 at a temperature of not less than -40.degree. C., as continuously and integrally formed. The non-magnetized part has crystal grain sizes of not more than 30 .mu.m. The metallic member is subjected to ferromagnetization and successive local non-magnetization of part or parts of the ferromagnetized member, and the thus obtained composite magnetic member is employed as a support member such as a sleeve in electromagnetic valves.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.