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1. 发明申请

WO2016006159A8 METHOD OF PRODUCING GALVANNEALED STEEL SHEET 审中-公开
标题翻译：生产钢化钢板的方法
公开(公告)号：WO2016006159A8
公开(公告)日：2016-12-29
申请号：PCT/JP2015002851
申请日：2015-06-05
申请人： JFE STEEL CORP
发明人： TAKEDA GENTARO , MIYAKE MASARU , MAKIMIZU YOICHI , SUZUKI YOSHITSUGU , SUZUKI YOSHIKAZU
IPC分类号： C23C2/02 , C21D9/56 , C22C38/00 , C22C38/04 , C23C2/06 , C23C2/28 , C23C2/40
CPC分类号： C21D9/561 , C21D9/56 , C22C38/00 , C22C38/04 , C23C2/02 , C23C2/06 , C23C2/28 , C23C2/40
摘要： Provided is a method of producing a galvannealed steel sheet, the production method being capable of achieving a favorable plated appearance and of suppressing reductions in tensile strength. This method of producing a galvannealed steel sheet has: a step wherein a steel strip is transported through the inside of an annealing furnace, in order through a heating zone that includes a direct-firing-type furnace, a soaking zone, and a cooling zone, and the steel strip is annealed; a step wherein, after being discharged from the cooling zone, the steel strip is hot-dip galvanized; and a step wherein the zinc-plating applied to the steel strip is heated and alloyed. The production method is characterized in that a mixed gas that includes a humidified gas and a dry gas is supplied to the inside of the soaking zone from at least one gas supply port that is provided to the height-direction lower half of the soaking zone, and in that the dew point measured in the height-direction upper fifth of the soaking zone and the dew point measured in the height-direction lower fifth are both -20-0 ℃.
摘要翻译：提供一种合金化热浸镀锌钢板的制造方法，其制造方法能够获得良好的镀层外观和抑制拉伸强度的降低。该合金化热浸镀锌钢板的制造方法具有以下步骤：通过包括直接燃烧型炉，均热区和冷却区的加热区，通过退火炉的内部输送钢带，钢带退火; 在从冷却区排出后，对钢带进行热浸镀锌的工序; 以及施加到钢带上的镀锌和合金化的步骤。该制造方法的特征在于，从设置在均热区域的高度方向下半部的至少一个供气口将含有加湿气体和干燥气体的混合气体供给到均热区域的内部，并且在均热区域的高度方向上方测得的露点和在高度方向下降到第五点的露点都为-20℃。

2. 发明申请

WO2016110910A8 METHOD OF PRODUCING GALVANNEALED STEEL SHEET 审中-公开
标题翻译：生产镀锌钢板的方法
公开(公告)号：WO2016110910A8
公开(公告)日：2017-05-11
申请号：PCT/JP2015006328
申请日：2015-12-18
申请人： JFE STEEL CORP
发明人： TAKEDA GENTARO , MIYAKE MASARU , MAKIMIZU YOICHI , SUZUKI YOSHITSUGU
IPC分类号： C23C2/02 , C21D1/74 , C21D1/76 , C21D9/56 , C23C2/06
CPC分类号： C21D1/74 , C21D1/76 , C21D9/56 , C23C2/02 , C23C2/06 , C23C2/28 , C23C2/40 , F27B9/045 , F27B9/28 , F27D7/02 , F27D7/06
摘要： The present invention provides a method of producing a galvannealed steel sheet with which plating adhesion is high and a favorable plated appearance can be obtained even when galvannealing is performed on a steel strip comprising 0.2 mass% Si or more and with which reduction of tensile strength can be limited by lowering alloying temperature. In the present invention, dry gas and a mixed gas of humidified gas with dry gas are supplied to the soaking zone of an annealing furnace. By supplying the mixed gas at suitable times from a position in the lower half of the soaking zone while supplying the dry gas at suitable times from near an upper hearth roll of the soaking zone and discharging gas in the furnace at suitable times from a gas discharge port located above the upper hearth roll, the dew point of at least the uppermost area in the soaking zone is controlled to −20°C to 0°C.
摘要翻译：本发明提供一种即使对含有0.2质量％以上的Si的钢带实施合金化处理也能够获得良好的镀覆外观，且能够降低拉伸强度的合金化热镀锌钢板的制造方法受限于降低合金化温度。在本发明中，将干燥气体和加湿气体与干燥气体的混合气体供应到退火炉的均热区。通过在适当的时间从保温区下半部分的位置供应混合气体，同时从保温区的上炉膛辊附近的适当时间供应干燥气体，并且在适当的时间从气体排出口位于上炉膛辊上方的出口，至少将保温区最上部的露点控制在-20℃至0℃。

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