C - Chemistry – Metallurgy – 22 – C
Patent
C - Chemistry, Metallurgy
22
C
75/119, 148/31
C22C 38/12 (2006.01) C21D 7/13 (2006.01) C21D 8/00 (2006.01) C22C 38/04 (2006.01)
Patent
CA 1147580
ABSTRACT OF THE DISCLOSURE Steel having low magnetic property, i.e., a low permeability, a thermal expansion coefficient of 1.0 ~ 1.3 x 10-5/°C and a high yielding point of higher than 36 Kg/mm2. It consists of less than 0.5% by weight of C, less than 2% by weight of Si, 20 ~ 30% by weight of Mn, and 0.005 ~ 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 Mn (%)> 16 x C (%) + 18 Mn (%)> -12 x C (%) + 21.5. The steel described above is heated to a temperature of less than 1220 °C, and then hot rolled. A finishing rolling temp- erature is maintained to be less than 800°C + 400°C x C (%) depending upon the amount of carbon. After cold working the nonmagnetic steel has a permeability of less than 1.1. This method enables the production of steel having the above proper- ties, at a low cost. This steel is suitable for use as guide structures, and reinforcing steel of railroad beds of the floating type high speed railway, structural members for con- structing fusion reactors, various electrical components, etc.
342612
Kohsaka Yohji
Ouchi Chiaki
Nippon Kokan Kabushiki Kaisha
Swabey Ogilvy Renault
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