Enhanced pyrometry for continuous galvanizing of advanced high strength steel

汽车制造商越来越依赖镀锌先进的高强度钢(AHSS)来实现轻量化。不幸的是，加拿大钢铁生产商报告称，由于强度不达标和锌层粘合，AHSS废品率高得令人无法接受。这个问题在很大程度上可以追溯到用于控制熔炉的高温计推断温度的错误。这些误差源于钢带表面状态的变化，即粗糙度和氧化物的形成，这会改变光谱发射率。滑铁卢大学的热辐射专家Kyle Daun教授和Polytech的冶金专家Myriam Brochu教授拟议的研究伙伴关系将通过以下方式解决这一问题：(I)阐明AHSS表面状态在加工过程中的演变，以及这如何影响光谱发射率；以及(Ii)确定温度漂移如何影响强度和锌的附着力。这些信息将被合成到一个算法中，该算法使用多波长高温计提供稳健的钢带温度估计。这项研究由国际锌协会(IZA)召集的镀锌车身伙伴关系支持，并将与镀锌AHSS的主要生产商Stelco、供应Stelco高温计的Williamson，Inc.、Williamson的安大略省分销商SRB Controls，Inc.以及加拿大最大的锌生产商Teck Metals，Inc.密切合作进行。Stelco将利用这项研究提高AHSS钢带生产的盈利能力，这也将使加拿大的钢铁和锌采矿业受益，后者提供了生产镀锌AHSS钢所需的原料。这些节省下来的资金将流向加拿大汽车零部件供应商和原始设备制造商，从而使整个汽车供应链和加拿大整体经济受益。

Automotive manufacturers increasingly rely on galvanized advanced high strength steels (AHSS) for lightweighting. Unfortunately, Canadian steel producers report unacceptably high AHSS rejection rates due to substandard strength and zinc layer adhesion. Much of the issue can be traced back to errors in the pyrometrically-inferred temperatures used to control the furnaces. These errors originate from the evolving surface state of the steel strip, in terms of roughness and oxide formation, which changes the spectral emissivity. The proposed research partnership between Prof Kyle Daun, a thermal radiation expert at the University of Waterloo, and Prof Myriam Brochu, a metallurgist at Polytechnique, will address this issue by: (i) elucidating how the AHSS surface state evolves during processing, and how this affects the spectral emissivity; and (ii) determining how temperature excursions affect strength and zinc adhesion. This information will be synthesized into an algorithm that provides robust steel strip temperature estimates using multiwavelength pyrometers. This research is supported by the Galvanized Autobody Partnership, convened by the International Zinc Association (IZA), and will be carried out in close collaboration with Stelco, a major producer of galvanized AHSS, Williamson, Inc. who supplies the pyrometers used by Stelco, SRB Controls, Inc., Williamson's Ontario distributor, and Teck Metals, Inc., Canada's largest producer of zinc. Stelco will use this research to enhance profitability of AHSS steel strip production, which will also benefit Canada's iron and zinc mining industry, who provide the feedstock needed to make galvanized AHSS steel. These savings will be passed down to Canadian automotive parts suppliers and OEMs, thereby benefiting the entire automotive supply chain and Canada's economy as a whole.