Nippon Steel Sumitomo Metal Corporation

Nobuyoshi Okada

Masanori Hoshino

Atsushi Sakatoku

A manufacturing equipment for galvanized steel sheet includes coating tub to coat steel sheet dipped in coating bath wherein the bath including molten zinc and Al is stored at bath temperature T, separating tub to separate by a flotation top-dross by precipitating the top-dross in the bath wherein the bath transferred from the coating tub is stored at bath temperature Tlower than T, adjusting tub to dissolve dross wherein the bath transferred from the separating tub is stored at bath temperature Thigher than Tand Fe of the bath is unsaturated, and circulator to circulate the bath in order of the coating tub, the separating tub, and the adjusting tub.

Manufacturing equipment for galvanized steel sheet, and manufacturing method of galvanized steel sheet

A manufacturing equipment for galvannealed steel sheet includes coating tub to coat steel sheet dipped in coating bath wherein the bath including molten zinc and is stored at bath temperature T1, separating tub to separate by flotation top-dross by precipitating the top-dross in the bath wherein the bath transferred from the coating tub is stored at bath temperature T2 lower than T1, Fe of the bath is supersaturated, and Al concentration A2 of the bath is controlled to high concentration by supplying first metal, adjusting tub to adjust Al concentration A3 of the bath by supplying second metal wherein the bath transferred from the separating tub is stored at bath temperature T3 higher than T2, Fe of the bath is unsaturated, and dross is dissolved, and circulator to circulate the bath in order of the coating tub, the separating tub, and the adjusting tub.

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Tokyo, Japan

Nobuyoshi Okada