clean steel(【技】纯净钢是一个相对概念，随着净化技术、检测手段、产品标准的进步与变化，人们对纯净钢的要求也随之变化。一般而言，纯净钢是指含非金属夹杂物很少的钢。非金属夹杂物严重影响钢的质量，它的含量、大小和形态是评定钢的纯净度的标志。: Inclusion removal from liquid steel consists of four steps, all of which must be understood and implemented in order to produce a clean steel. 从钢水中清除夹杂物分为四步。为了生产洁净钢，对于每一步都必须理解并加以执行。)
gas-cleaning system(The large diameter and the vertical height of these uptakes prevent excessive amounts of charge material from blowing over into the gas-cleaning system. 这些上升管具有大的直径和高的垂直上升段，能够防止将过量的炉料向上吹人(高炉)煤气净化系统。)
