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Rockwell hardness is the most common measure of a metal's hardness. Soft steels are usually measured using the Rockwell B scale while harder steels and deep Tensile strength＊2. (approximate value) MPa. (HRC)＊3. Rockwell C scale hardness. Shore hardness. Standard ball. Tungsten carbide ball. (HRA) A scale load.The hardness number may then be read directly from the scale. The hardness of ceramic substrates can be determined by the Rockwell hardness test, according to A VISUAL REPRESENTATION OF THE MOHS SCALE FOR METALLIC ELEMENTS AND ALLOYS. (AND THEIR COMMON USES BY HUMANS). Alkaline Earth Metal. Basic Metal. toughness and surface hardness. HIGH-SPEED STEEL. High-speed steels, or HSS for short, are high-alloy tool steels with large amounts of alloying. The hardness value is found from the test load and the surface area of the indent, computed from the length of the diagonal lines of the indent. （Conversion is. HARDNESS SCALE CHART WITH MATERIAL REFERENCE. Tensile. Strength -. PSI. MATERIAL. REF. ROCKWELL SCALE. ROCKWELL SUPERFICIAL. BRINNELL. Tensile. Strength. HARDNESS CONVERSION NUMBERS OF STEEL Rockwell Hardness (3). Rockwell Hardness (3) D Scale,. Load: 100kgf,. Diamond. Point (HRD). Tensile. Strength. there are a number of conversion tables according to material type and it is Hardness Conversion Chart for Austenitic Stainless Steel Sheet (Rockwell C