| 摘要 |
A process for producing a galvanneal layer on a steel substrate, including forming a Zn-Fe coating having a predetermined Fe content F (wt. %) on the steel substrate; and heat treating the Zn-Fe coating on the substrate from a predetermined starting temperature T1 ( DEG C.) to a predetermined ending temperature T2 ( DEG C.) at a predetermined heating rate R ( DEG C./min.), wherein F, T1, T2, and R are selected so that the following condition is met, a.R2+b.T2+c.R.F.+d.R.T +e.R+f.T=g where a, b, c, d, e, f and g are predetermined constants, thereby to form a virtually 100% delta 1 phase galvanneal structure. Alternatively, the heat treatment can be preformed until the specimen temperature is just below a minimum temperature of the delta 1 phase stability range at at selected Fe content and heating rate, followed by an isothermal hold for a predetermined time period until transformation to the delta 1 phase occurs.
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