Process for manufacturing galvannealed steel sheets having...

C - Chemistry – Metallurgy – 23 – C

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C23C 2/06 (2006.01) C23C 2/02 (2006.01) C23C 2/28 (2006.01)

Patent

CA 2076984

It is an object to provide a process for manufacturing galvannealed steel sheets exhibiting excellent anti-powdering property when press formed, and uniform frictional properties in a coil. A steel strip is galvanized in a bath having a low aluminum content after entering it at a high temperature as defined in relation to the aluminum content of the both, so that the formation of a ~ phase may be promoted. Then, the strip is heated for alloying in a high-frequency induction heating furnace so as to have a temperature not exceeding 495°C when leaving the furnace to yield a plated steel strip having a coating containing a uniformly distributed ~ phase. After such heat treatment and cooling, the strip can be plated with an iron or iron-alloy top coating having an iron content of at least 50% and a coating weight of at least 1 g/m2 to achieve an improved press formability.

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