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我厂生产标准紧固件,其产品高强度六角螺母用45~#优质碳结钢制成,且生产批量大、质量要求高,不允许有材料混杂现象.若发现混杂现象必须逐一对此螺母进行洛氏硬度测试分选,这样既费时又不经济.近三年来,我们根据钢在热处理后的特性,进行了多方面的试验,从而摸索了45钢与A_3钢淬火后的宏观简易分选方法,效果良好.现介绍如下:将淬回火后的螺母在浓度24～28%盐酸池内酸洗5～10min,然后在3～5%
I plant the production of standard fasteners, the product of high strength hex nuts with 45 ~ # made of high-quality carbon steel, and the production volume, high quality requirements, does not allow the phenomenon of mixed materials. If you find that the phenomenon must be mixed one by one on the nut Rockwell hardness test sorting, it is both time-consuming and uneconomical.In the past three years, we based on the characteristics of steel after heat treatment, conducted a wide range of experiments to explore the 45 steel and A_3 after quenching macro-simple selection of steel Method, the effect is good now are as follows: the quenched and temper nut in a concentration of 24 ~ 28% hydrochloric acid pickling 5 ~ 10min, then 3 ~ 5%