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研究和工厂应用表明，高速钢件的初始磁导率随淬火温度的增加而降低，随回火温度的增加而增加。而基于初始磁导率法的WGF-1型微机式钢铁材质自动分选仪的数显值与高速钢件的硬度之间成“C”型关系，并且过热、过烧和裂纹件均出现在“C”型关系的下半部。因此，用WGF-1仅能一机准确完成高速钢过热、过烧、裂纹和硬度的检测，其硬度检测精度为HRC±1。速度可达1500件／小时。
The research and factory application show that the initial permeability of HSS decreases with the increase of quenching temperature and increases with the increase of tempering temperature. However, based on the initial permeability method, the WGF-1 microcomputer-type steel automatic sorter has a “C” relationship between the digital display value and the hardness of the HSS, and overheating, over-burning and cracking occur in the The lower half of the “C” type relationship. Therefore, using WGF-1 only one machine to accurately detect overheating, over-burning, cracking and hardness of high-speed steel, the hardness detection accuracy of HRC ± 1. Speed up to 1500 pieces / hour.