临界点 A_(C1)和 A_(C3)是两个重要的特性,要决定钢件热处理的规范,必须确定临界点 A_(C1)和 A_(C3)。用实验方法确定临界点并不都合适,特别是在车间的条件下,要确定钢某一具体成份的加热温度,以实验方法测定上述临界点就不合理。因此有发展前途的做法是建立一种能把临界点与钢的化学成份联系起来的数学模型。有些已为众所周知的文献进行了一些尝试以建立这种数学摸型。因此,为获得相应的方程,提出了如下的假设:转变温度与钢 Critical points A_ (C1) and A_ (C3) are two important characteristics. To determine the specification of heat treatment of steel parts, the critical points A_ (C1) and A_ (C3) must be determined. Experimental methods to determine the critical point is not appropriate, especially in the workshop conditions, to determine the heating temperature of a specific component of steel, the experimental method to determine the above-mentioned critical point is unreasonable. Therefore, there is a promising way to establish a mathematical model that can relate the critical point to the chemical composition of steel. Some have made some attempts to establish this mathematical model for the well-known literature. Therefore, in order to obtain the corresponding equation, the following assumptions are made: transition temperature and steel