我厂高频热处理组每年都要制造一、二十套高频淬火感应器。感应器系用纯铜制成。由于铜硬度低,塑性高,在锯制过程中,硬而脆的碳素工具钢手工锯条很易掰齿和折断,每做一次感应器都要损耗许多手工锯条。后来我们将手工锯条用硝盐炉进行中温回火(350℃),使之硬度由HRA82～84降至HRA75～76(相当于HRC48～51),这样便大大提高了它的韧性。经过使用效果极佳,一根经过中温回火的手工锯条用了整整一年, I plant high-frequency heat treatment group every year to create one or two sets of high-frequency quenching sensors. The sensor is made of pure copper. Due to the low hardness of copper and high plasticity, hard and brittle carbon tool steel hand saw blades are easy to break and break during the sawing process. Many hand saw blades are sacrificed every time the inductor is made. Later, we hand-saw the blade with a salt-hearth furnace temperature tempering (350 ℃), the hardness dropped from HRA82 ~ 84 to HRA75 ~ 76 (equivalent to HRC48 ~ 51), thus greatly enhancing its toughness. After the use of excellent results, a tempered hand saw blade used for a whole year,