钢锭或钢坯在常温下很难变形，不易加工，需要进行加热到1100℃到1250℃进行轧制，这种轧制工艺叫做热轧。在常温下的轧制一般理解为冷轧.

Ingot or billet are difficult to be deformed at normal temperature and are not easy to be processed. They need to be heated to 1100 and 1250 C for rolling. This rolling process is called hot rolling. Rolling at normal temperature is generally understood as cold rolling.

从金属学角度来看，热轧与冷轧的界限应该以金属再结晶的温度来区分，即低于再结晶温度的轧制为冷轧；高于再结晶温度的轧制为热轧。而钢的再结晶温度一般在450℃～600℃范围之内。

From the point of view of metallization, the boundary between hot rolling and cold rolling should be distinguished from the temperature of recrystallization of metal, that is, the rolling that is lower than the recrystallization temperature is cold rolling, and the rolling that is higher than the recrystallization temperature is hot rolling. The recrystallization temperature of steel is generally within the range of 450 ~ 600.

轧钢机的成长都是在品质有所保证的前提下所进行的，因为品质是轧钢机生存在市场中的旗帜，只有拥有良好的品质才能让自身的旗帜在市场中高高的飘荡。

The growth of the rolling mill is carried out under the premise of quality assurance, because the quality is the banner of the steel rolling machine in the market. Only with good quality can its flag float high in the market.