狭义定义: 轧制机设备。它使轧件在旋转的轧辊间产生塑性变形，轧出所需断面形状和尺寸的钢材。即主要设备一一主机列。  (厚板、中板、薄板、轨梁、槽钢、角钢、螺纹钢筋、线材等)
广义定义: 用于轧制钢材生产工艺全部所需的主要设备和辅助设备的成套机组。包括轧制，运输、翻钢、冷却、剪切、矫直等设备。

Narrow definition: Rolling mill equipment. It causes the rolled piece to undergo plastic deformation between the rotating rolls, rolling out steel with the required cross-sectional shape and size. That is, the main equipment - the host column. (Thick plates, medium plates, thin plates, rail beams, channel steel, Angle steel, threaded reinforcing bars, wire rods, etc.)

Broad definition: A complete set of equipment and auxiliary equipment required for all the main and auxiliary equipment in the steel rolling production process. Including rolling, transportation, steel flipping, cooling, shearing, straightening and other equipment.