Rockwell Hardness Test

The Rockwell hardness value is a hardness number (HR) derived from the net increase in the depth of the indentation as the force on an indenter is increased from a specified preliminary test force to a specified total test force and then returned to the preliminary test force.

The Rockwell hardness number is followed by the symbol HR and the scale designation. When a ball indenter is used, the scale designation is followed by the letter “W” to indicate the use of a tungsten carbide ball. (Examples: 64 HRC = Rockwell hardness number of 64 on Rockwell C scale; 72 HRBW = Rockwell hardness number of 72 on Rockwell B scale measured using a tungsten carbide ball indenter.)

The test must be conducted on a smooth, even surface that is free from oxide scale, foreign matter, and, in particular, free from lubricants.

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