C - Chemistry – Metallurgy – 23 – C
Patent
C - Chemistry, Metallurgy
23
C
C23C 2/28 (2006.01) C23C 2/02 (2006.01) C23C 2/06 (2006.01)
Patent
CA 2076964
It is an object to provide a process for manufacturing galvannealed steel sheets having high anti-powdering property as required when they are press formed, and stabilized frictional properties in a coil. Steel sheets are plated in a bath having a low aluminum content, while they have, when entering the bath, a low temperature as defined in relation to the aluminum content of the bath, so that an alloying reaction may be prevented. Then, the sheets are heated for alloying in a high-frequency induction heating furnace so that the sheets leaving the furnace may have a temperature of from over 495°C to 520°C to yield galvannealed steel sheets consisting mainly of a ~1 phase. An iron or iron-alloy top coating having an appropriate iron content can be applied onto the plated steel surface to improve its paintability.
Abe Masaki
Hiraya Akira
Inagaki Junichi
Morita Masaya
Sagiyama Masaru
Jfe Steel Corporation
Ogilvy Renault Llp/s.e.n.c.r.l.,s.r.l.
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