Transcription of Hardness Conversion Charts
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Hardness Conversion Charts
BUEHLER HardnessConversionChartsIntroductionThe requirement to convert from one Hardness test scale to another is quite common and as such is covered by variousInternational Standards (ASTM E140, ISO 18265). These standards point out that, due to the differences in the various typesof Hardness test methods, it is not possible to show a constant Conversion relationship across all materials. As such, the standards provide approximate conversions only with defined Hardness ranges and test loads for specific materials. Thusthere are a number of Conversion tables according to material type and it is essential to use the correct one. The followingconversion Charts have been constructed according to the Hardness test scale Conversion algorithms provided within ASTME140. Please treat all converted values as approximations table below lists the scales present in the following tables and any restrictions on the load ranges valid for the and Load forceVickersHVVickers diamond, nickel alloys (1, 5, 10 or 30-kgf), copper (100-gf), aluminum (15-kgf)KnoopHKKnoop diamond, 500-gf and overRockwell AHRAD iamond, 60-kgfRockwell BHRBS teel ball 1 16 , 100-kgfRockwell CHRCD iamo
1 Hardness Conversion Chart for Non-Austenitic Steels (Rockwell C Range) HV HK HRC HRA HRD HR15N HR30N HR45N HBW 950 917 68.0 85.7 76.9 93.4 84.7 75.9
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