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View Paper |
Session Topic: 10A, Reference Materials |
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Paper Title: Worldwide Comparisons of Rockwell Hardness Scales that Use a Diamond Indenter |
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Date & Time: THURSDAY, August 8, 2002 |
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10:30am - 12:10n - PARALLEL SESSIONS - SESSION 10 |
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Speaker: Samuel R. Low
NIST |
Email: samuel.low@nist.gov |
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Over the past twenty years, the United States has participated in two major worldwide comparisons of Rockwell hardness scales. In 1984, the International Organization of Legal Metrology (OIML) conducted a comparison of the Rockwell C scale (HRC) with fourteen member countries participating. The latest worldwide comparison was completed in 1999, covering all Rockwell hardness scales that use a diamond indenter. This comparison, which was funded and administered by the European Community (EC), included participation by National Metrology Institutes of twelve countries throughout the world. Although the 1999 comparison showed improved agreement amongst the world’s national hardness standardizing laboratories as compared to the OIML study, there continues to be significant differences. This has led the Working Group on Hardness (WGH) of the International Committee for Weights and Measures (CIPM) to work towards reducing these differences by better defining Rockwell hardness test parameters and by initiating a new key comparison of the National Metrology Institutes that standardize Rockwell diamond indenters. |
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