DEVELOPING NIST ROCKWELL HARDNESS DIAMOND INDENTER SRMS BASED ON ISO 6508-3:2015 STANDARD

John Song, Samuel Low, Thomas B. Renegar, Li Ma

Abstract

The ISO 6508-3:2005 standard specified a tight tolerance for the cone flank straightness of Rockwell diamond indenters (0.5 µm for maximum). In the recent issued ISO 6508-3:2015 standard, significant changes on the microform geometrical specification of Rockwell diamond indenters and calibration conditions have been made: the tolerance range for cone flank straightness has been relaxed from “0.5 µm for maximum” to “0.5 µm for average and 0.7 µm for maximum”; and the window size and location for calibration of the Rockwell diamond indenters have been specified. Based on the technical specification of ISO 6508-3:2015, NIST researchers are working with diamond manufacturers to develop the Standard Reference Material (SRM) Rockwell hardness diamond indenters to support U.S. Rockwell hardness standardization.

Keywords

Rockwell C hardness, HRC, microform calibration, diamond indenters, ISO 6508-3:2015

Download

IMEKO-WC-2015-TC5-169.pdf

DOI

-

IMEKO TC

TC5 - Hardness Measurement

Back to the proceedings