Patent ID: 6187459
Filing Date: 2001-02-13
Classification: B60T,C21D,F15B,F16K,H01F,Y10S

Abstract:
A composite magnetic member, which comprises a metallic member comprising not more than 0.6 wt % C, 12 to 19 wt % Cr, 6 to 12 wt % Ni, not more than 2 wt % Mn, not more than 2 wt % Mo, and not more than 1 wt % Nb, and having the following properties:Hirayama's equivalent, defined as (Ni wt %)+1.05 (Mn wt %)+0.65 (Cr wt %)+0.35 (Si wt %)+12.6 (C wt %), is in a range of from 20 to 23 wt %;Nickel equivalent, defined as (Ni wt %)+30 (C wt %)+0.5 (Mn wt %), is in a range of from 9 to 12 wt %; andChromium equivalent, defined as (Cr wt %)+(Mo wt %)+1.5 (Si wt %)+0.5 Nb wt %, is in a range of from 16 to 19 wt %,wherein the metallic member includes 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 as low as -40.degree. C., as continuously and integrally formed, the non-magnetized part having crystal grain sizes of not more than 30 .mu.m.