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HOT-DIP AL-COATED STEEL SHEET WITH EXCELLENT THERMAL BLACKENING RESISTANCE AND PROCESS FOR PRODUCTION OF SAME
HOT-DIP AL-COATED STEEL SHEET WITH EXCELLENT THERMAL BLACKENING RESISTANCE AND PROCESS FOR PRODUCTION OF SAME
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机译：具有优异的抗热黑变性能的热浸镀铝钢板及其生产工艺
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摘要
In conventional Al coated steel sheet, with the Al coating as it is, black discoloration cannot be prevented at 550°C or more. For this reason, post annealing is used to form a barrier layer and suppress the formation of Fe-Al intermetallic compounds. However, with this method, there were the problems that the steel sheet became poor in workability and, further, high temperature, long time heating was required, so there were problems from the workability, economy, and environmental aspect. The present invention provides steel sheet which has a heat black discoloration resistance even at a 550°C or more high temperature without additional annealing after Al coating and further is excellent in workability.;That is, it is hot dip Al coated steel sheet which comprises steel sheet which contains predetermined ingredients of C, Si, P, S, Al, N, and O plus one or both of furthermoreNi: 0.01 to 0.1% orCu: 0.01 to 0.1% andsatisfies 10η×C+Ni+Cu0.03 and an Al coating layer which contains Si: 4 to 11% on the surface of that steel sheet and which have a thickness 5 µm or less Al-Fe-Si alloy layer in the interface between the Al coating layer and the steel sheet.
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机译：在现有的Al镀层钢板中，直接使用Al被膜，在550℃以上不能防止黑色变色。因此，后退火用于形成阻挡层并抑制Fe-Al金属间化合物的形成。但是，该方法存在钢板的加工性变差，进而需要高温，长时间加热的问题，因此，从加工性，经济性，环境等方面存在问题。本发明提供即使在550℃以上的高温下也具有耐热黑变色性，且Al镀覆后不进行额外的退火而具有优异的加工性的钢板。包含C，Si，P，S，Al，N和O的预定成分以及一种或两种以上的钢板Ni：0.01至0.1％或Cu：0.01〜0.1％，满足10η×C + Ni + Cu> 0.03，并且在该钢板的表面上含有Si：4〜11％，且在Al-Fe-Si合金层之间的厚度为5μm以下的Al涂层。铝涂层和钢板。
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