ASTM E18-02 pdf free.Standard Test Methods for Rockwell Hardness and Rockwell Superficial Hardness of Metallic Materials. These test methods cover the determination of the Rockwell hardness and the Rockwell superficial hardness of metallic materials, including test methods for the verification of machines for Rockwell hardness testing (Part B) and the calibration of standardized hardness test blocks (Part C). 4. Significance...