APMP.M.H-S3 Final Report Comparison on Hardness ... - BIPM

Revision: <strong>Final</strong> <strong>Report</strong>
Date: May 25, 2012
Korea Research Institute of
Standards and Science (KRISS)
National Physical Laboratory
India
1-15 September 2010 1-15 September 2010
1-15 July 2010 1-15 October 2010
SCL, Hong Kong was able to make the measurement only in HRB scale, while others
participants made the measurement in all the range of hardness scales, i.e. both in HRA
and HRB.
4. Artifacts
The artifact reference blocks for Rockwell hardness scale A and scale B are
manufactured by Asahi Giken Co.,Ltd. Japan. Each scale consists of hardness block
with serial number as in the table 4. The dimensions of the blocks are 65 mm in
diameter and thickness of each block as in the table 4. All hardness block with 10.5 mm
thickness are made from brass while the rest is made from steel.
Table 4 Artifact Identifications
HRA Set S/N Thickness HRB Set S/N Thickness
35 HRA A32517 11.5 mm 25 HRB E1620 10.5 mm
40 HRA A33781 11.5 mm 30 HRB B30120 10.5 mm
55 HRA 25568 15 mm 40 HRB A31382 10.5 mm
60 HRA B12037 15 mm 50 HRB A32411 10.5 mm
70 HRA B15871 15 mm 60 HRB A33748 10.5 mm
80 HRA A27761 15 mm 70 HRB A28422 10.5 mm
85 HRA A21048 15 mm 80 HRB A35542 10.5 mm
90 HRB 25566 15 mm
100 HRB 30836 15 mm
The surface of each artifact block was laser engraved with divided segments for
indicating the indentation positions (Figure 1). Each segment is used for single
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