Rockwell superficial hardness test
Rockwell superficial hardness test
Indentation hardness test uses a calibrated machine that utilizes the depth of indentation, under constant load, as a measure of hardness. There are five superficial hardness scales (N, T, W, X and Y) and three different loads (15, 30 and 45 kgf) that can be applied to the appropriate indenter. The most common scales are N and T. The 120º spheroconical diamond indenter is used with scale N and the 1¼16" (1.588mm) ball is used with scale T. The 15-, 30- or 45-kgf load can be used for both scales. The result is expressed as the Rockwell hardness number.
Indentation hardness test uses a calibrated machine that utilizes the depth of indentation, under constant load, as a measure of hardness. There are five superficial hardness scales (N, T, W, X and Y) and three different loads (15, 30 and 45 kgf) that can be applied to the appropriate indenter. The most common scales are N and T. The 120º spheroconical diamond indenter is used with scale N and the 1¼16" (1.588mm) ball is used with scale T. The 15-, 30- or 45-kgf load can be used for both scales. The result is expressed as the Rockwell hardness number.