Rockwell hardness of zirconium alloy – Zircaloy – 4 is approximately 89 HRB. Rockwell Regular hardness =130 0 002 − h, HRN HRTW Rockwell Superficial hardness =100 0 001 − h, 4.2 The following is an example of the designation of Rockwell hardness. Rockwell hardness test is one of the most common indentation hardness tests, that has been developed for hardness testing. Like the Brinell hardness scale, the Rockwell scale is based on measuring the depth of the indentation made by pressing a diamond point, or a ball, into the material. Rockwell hardness numbers are usually used to describe the hardness of metals, although they are also used for some plastics. 4.1 The Rockwell hardness test is an empirical indentation hardness test that can provide useful information about metallic materials.This information may correlate to tensile strength, wear resistance, ductility, and other physical characteristics of metallic materials, and may be useful in quality control and selection of materials. EXAMPLE 70 HR 30 T W indication of type of Hardness testing can determine if a metal has the necessary properties for its intended use. Metal Hardness is usually defined by the Rockwell Hardness Test. Top 5 Durable Metals From the list, you can see that the Top 5 Durable The Mohs Scale of Hardness for Metals Here is a list of the hardness grades for some of the metals that you are most likely to come across in your everyday life, … But when we are dealing with Jewelry, most people are more familiar with the Moh’s Scale.

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