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Fundamentals of Rockwell Hardness Testing

Fundamentals ofRockwell Hardness TestingFundamentals of Rockwell Hardness TestingPrinciple of TestThe Rockwell test consists of measuring the additionaldepth to which a carbide ball or Brale diamondpenetrator is forced by a heavy (major) load beyond thedepth of a previously applied light (minor) load (SET point).The minor load is applied first and a SET position isestablished on the dial gauge or displacement sensor of theRockwell tester. Then the major load is applied. Withoutmoving the piece being tested, the major load is removedand, with the minor load still applied, the Rockwell hardnessnumber is automatically indicated on the dial gauge or Brale diamond penetrator is used for Testing materialssuch as hardened steels and cemented carbides.

materials such as steel-copper alloys, aluminum and plastics to name a few. Rockwell testing falls into two categories: Regular Rockwell testing (e.g., C and B scales) and Rockwell superficial testing (e.g., 30 N and 30 T scales). High Rockwell hardness numbers represent hard materials and low numbers soft materials. d 2 www.wilsoninstruments.com

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