C - Chemistry – Metallurgy – 22 – C
Patent
C - Chemistry, Metallurgy
22
C
75/120, 148/48
C22C 38/04 (2006.01) C21D 1/18 (2006.01) C21D 6/00 (2006.01) C22C 38/06 (2006.01) C22C 38/10 (2006.01) C22C 38/12 (2006.01) C22C 38/18 (2006.01) C22C 38/22 (2006.01) C22C 38/30 (2006.01)
Patent
CA 1133286
ABSTRACT OF THE DISCLOSURE Steel having a structure of ferrite and tempered martennite and exhibiting excellent vibration attenuation characteristic is manufactured by the steps of forming a solid Jolution of steel consisting essentially of 0.02 - 0.01% by weight of carbon: less than 0.6% by weight of silicon 0.5 - 1.5% by weight of manganese: eithel one or more of 5 - 15% by weight of chromium and 2 - 9% by weight of tungsten: either one or both of 0.03 - 2% by weight of aluminum and 0.1 - 5% by weight of cobalt, less than 1.5% by weight of copper if necessary and the balance consisting of iron: comprising heating and keeping for a desired time period the alloyed steel in a temperature range in which austenite and ferrite coexist; cooling the steel so sa to transform austenite to martensite; and tempering the steel at a temperature of from 400°C to a temperature below a transformation point thus forming a structure of ferrite and martensite. Steel incorporating copper is suitable for precipi- tation hardening. Advantageously, the amount of the tempered martensite should be less than 60% by volume.
330123
Nippon Kokan Kabushiki Kaisha
Swabey Ogilvy Renault
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