1.Rockwell hardness testers are more simple and efficient on testing speed.2.The indentation of Rockwell hardness testers is smaller, causing less influence on the surface of the specimen. Therefore, they are often used to test hardness of a large number of machinery, metallurgical, and hot working specimen, such as cutting tools, moulds and tools etc.
1. Fxi the specimen with its testing side facing the indenter;
2. Apply initial test force;
3. Adjust the barrel dial to “0”(for the magnetic type Rockwell hardness testers, there is no this process);
4. Load major test force and then unload the major test force;5. Take the reading.
ASTM E18 Standard Test Methods for Rockwell Hardness of Metallic Materials
ASTM E18 Metallic materials —— Rockwell hardness test Part 2: Verification and calibration of testing machines and indenters