目前工厂中常用的电热材料主要为0Cr25A15和Cr20Ni80,物理性能和力学性能如表所示。这两种材料在使用过程中,由于温度的高、低会产生热胀冷缩的现象,导致电热丝也会伸长或缩短,因此,对电热丝的节距也要进行调整。 At present the factory commonly used electric materials are mainly 0Cr25A15 and Cr20Ni80, physical and mechanical properties as shown. These two materials in the course of use, due to the high temperature, low will produce thermal expansion and contraction phenomenon, resulting in heating wire will also be extended or shortened, so the pitch must also be adjusted.