热轧板，轧件的温度高，因此变形抗力小，可以实现大的变形量。以钢板的轧制为例，一般连铸坯厚度在230mm左右，而经过粗轧和精轧，最终厚度为1~20mm。同时，由于钢板的宽厚比小，尺寸精度要求相对低，不容易出现板形问题，以控制凸度为主。对于组织有要求的，一般通过控轧控冷来实现，即控制精轧的开轧温度、终轧温度和卷曲温度来控制带钢的微观组织和机械性能。

The temperature of hot rolled plate and rolled piece is high, so the deformation resistance is small and large deformation can be realized. Taking the rolling of steel plate as an example, the thickness of continuous casting slab is generally about 230mm, while after rough rolling and finish rolling, the final thickness is 1 ~ 20mm. At the same time, because the width thickness ratio of the steel plate is small and the requirements for dimensional accuracy are relatively low, the shape problem is not easy to occur, and the convexity is mainly controlled. The requirements for microstructure are generally realized by controlled rolling and cooling, that is, the microstructure and mechanical properties of the strip are controlled by controlling the start rolling temperature, final rolling temperature and crimp temperature of finish rolling.

从定义上来说，钢锭或钢坯在常温下很难变形，不易加工，一般加热到1100～1250℃进行轧制，这种轧制工艺叫热轧。大部分钢材都用热轧方法轧制。但是因为在高温下钢的表面容易生成氧化铁皮，使热轧钢材表面粗糙，尺寸波动较大，所以要求表面光洁、尺寸精确、力学性能好的钢材，以热轧半成品或成品为原料再用冷轧方法生产。

By definition, ingots or billets are difficult to deform and process at room temperature. Generally, they are heated to 1100 ~ 1250 ℃ for rolling. This rolling process is called hot rolling. Most steel is rolled by hot rolling. However, because the surface of steel is easy to form iron oxide scale at high temperature, which makes the surface of hot-rolled steel rough and the size fluctuates greatly, the steel with smooth surface, accurate size and good mechanical properties is required to be produced by cold rolling with hot-rolled semi-finished products or finished products as raw materials.

热轧板如未经酸洗处理，则与市场上很多普通钢板的表面相类似，生了锈的表面为红色，没生锈的表面为紫黑色(氧化铁皮)。

If the hot-rolled plate is not pickled, it is similar to the surface of many ordinary steel plates on the market. The rusted surface is red and the non rusted surface is purple black (iron oxide scale).