Hot-dip aluminized steel sheet, method of manufacturing the same and alloy-layer control apparatus

摘要

PCT No. PCT/JP96/00307 Sec. 371 Date Oct. 23, 1996 Sec. 102(e) Date Oct. 23, 1996 PCT Filed Feb. 9, 1996 PCT Pub. No. WO96/26301 PCT Pub. Date Aug. 29, 1996In order to provide a hot-dip aluminized steel sheet with increased peeling resistance of the coating layer, the thickness of the Fe-Al-Si alloy-layer is set to be 1-5 mu m, while the maximum differential unevenness of thickness of the Fe-Al-Si alloy layer is set to be 0.5-5 mu m. The hot-dip aluminized steel sheet is manufactured by controlling an elapsed time from the beginning of immersion of the basemetal steel sheet into the aluminizing bath to the completion of solidification of the coating-metal layer which has passed through the bath. In addition another elapsed time is controlled from the time after the base-metal steel sheet has been guided out over the bath to the completion of solidification of the coating-metal layer.