INTERLABORATORY COMPARISON ON ROCKWELL HARDNESS MEASUREMENT IN THAILAND

Tassanai Sanponpute, Veera Tulasombut, Rugkanawan Kongkavitool, Apichaya Meesaplak

Abstract

Hardness laboratory of National Institute of Metrology Thailand (NIMT) was a pilot laboratory and responsible for coordinating the interlaboratory comparison in Thailand. The two comparison protocols, comparison on Rockwell scale B hardness measurement and comparison in scale C hardness measurement, were set up for participant to choose according to their application. The artifacts used in these comparisons were hardness reference blocks and machinery part such as cylindrical axles and metal sheets. The measurement result and uncertainty budget were reported to pilot laboratory and are used to compute deviation from reference value and En numbers. Most laboratories had En numbers under 0.5 while few laboratories had En numbers between 0.5 to 1. Only one laboratory, who declared unusual BMC, had <i>E</i>_n number higher than 2.

Keywords

Rockwell, interlaboratory comparison

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IMEKO-TC5-2010-022.pdf

DOI

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IMEKO TC

TC5 - Hardness Measurement

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