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前言洛氏C标尺高、中、低示值不吻合的原因众说不一，还没有明确的统一说法，一直困惑试验、检定、维修工作者。查阅近20年的金属洛氏硬度计检定规程对C标尺的规定：（l）JJGllZ－91（现行）规定：高值60～70HRC示值允差为主1．0HRC；中值30～55HRC示值允差为全1．2HRC；低值20
Preface Rockwell C scale high, medium and low value is not consistent with the reasons for different, there is no clear unified statement, has been confused test, test, repair workers. Check the nearly 20 years of metal Rockwell hardness test procedures for the provisions of the C scale: (l) JJGllZ-91 (current) provides that: the high value of 60 ~ 70HRC indication tolerance mainly 1.0HRC; median 30 ~ 55HRC The value of tolerance for the full 1.2HRC; low value of 20