热轧钢在汽车上主要用于制造横梁和车架等比较厚的零部件。它是在730℃以上的高温下轧制的，厚度在4mm以上。

Hot-rolled steel is mainly used in cars to make thick parts such as beams and frames.It was rolled at high temperatures above 730℃, with a thickness of over 4mm.

热轧的钢材产品，对于厚度和边宽这方面不好控制。我们熟知热胀冷缩，由于开始的时候热轧出来即使是长度、厚度都达标，最后冷却后还是会出现一定的负差，这种负差边宽越宽，厚度越厚表现的越明显。所以对于大号的钢材，对于钢材的边宽、厚度、长度，角度，以及边线都没法要求太精确。

Hot-rolled steel products, for the thickness and edge width of this aspect is not good to control.We are familiar with thermal expansion and cold contraction. At the beginning, even if the length and thickness reach the standard, there will be a certain negative difference after finally cooling. The wider the edge width of the negative difference, the thicker the thickness, the more obvious.Therefore, for the large steel, for the steel edge width, thickness, length, Angle, and the edge line can not be required for too accurate.

在铁素体区轧制工艺的工业化实践上，首钢京唐公司已成为国内第一家实现铁素体区轧制热轧带钢产品年产超万吨的企业。铁素体区轧制工艺是当今钢铁行业在热轧领域的前沿工艺。铁素体区轧制利用带钢在铁素体区变形抗力小的特点进行低温轧制，随后采用较高的卷取温度获得铁素体组织，提高热轧带钢塑性，降低强度，实现了高深冲性能和高伸长率的热轧带钢产品生产，并提高了带钢的表面质量。在获得更优良产品性能的同时，大幅降低了热轧工序能耗，提高了成材率。

In the industrial practice of rolling process in iron body area, Shougang Jingtang Company has become the first enterprise in China to realize the annual output of hot rolled strip steel products in iron body area exceeds 10,000 tons.The rolling process is the cutting-edge process in the hot rolling industry.The rolling in the ferrite area uses low temperature rolling of small deformation resistance in the ferrite area, and then high winding temperature is adopted to improve the hot rolled strip plasticity, reduce the strength, realize the production of hot rolled strip products with high deep flushing performance and high elongation, and the surface quality of the strip is improved.While obtaining better product performance, the energy consumption in the process of hot rolling process is greatly reduced and the material rate is improved.

热轧板轧钢工艺的技术复杂，因此对于相关人员而言，在未来工作中需要充分把握其中的技术细节，优化技术应用路径，并结合现有生产经验完善加工过程，这样才能有效避免质量问题发生，最终增强提高企业的生产力，提高经济效益，推动企业实现长远发展。

Hot rolling plate steel rolling technology is complex, so for relevant personnel, in the future work need to fully grasp the technical details, optimize the technology application path, and combined with the existing production experience to improve the processing process, so as to effectively avoid quality problems, eventually enhance the productivity of the enterprise, improve economic benefits, promote the enterprise to achieve long-term development.