For scratch, indentation, and rebound hardness, the measurement methods vary (e.g. group a copper base alloys * hardness rockwell (hrb/hrc) ** conductivity % i.a.c.s. and not comma [,], i.e. As the units are derived from these measurement methods, they are not suitable for direct comparison. Approximate Equivalents of Rockwell B Hardness Numbers for Soft Metals Hardness Conversion or Equivalents: Hardness conversion between different methods and scales cannot be made mathematically exact for a wide range of materials. Rockwell B-Scale Hardness 1/16 inch diamond ball, 100 kgf load : Symbol: HRB : The Rockwell Hardness Test presses a steel or diamond hemisphere-conical penetrator against a test specimen and measures the resulting indentation depth as a gage of the specimen hardness. For decimal numbers, input period [.] 0.25. Different loads, different shape of indenters, homogeneity of specimen, cold working properties and elastic properties all complicate the problem. However, you can always use a conversion table for comparing the Rockwell (B & C), Vickers and Brinell values. % max. Update Range. The Rockwell scale is a hardness scale based on indentation hardness of a material. Copper (Cu) strength strong 193 MPa (yield strength) hardness very soft 10 Rockwell B scale ductility very easy to shape 1 1 –very ductile 5 - stiff weight heavy 8.96 Specific gravity melting point medium 1083 degrees C conductivity very good 100 Relative conductivit y at 20degC rust no corrosion resistance good cost expensive 15 times more than steel. … % min. The harder the material, the higher the HR reading. Antimony () Brinell, Rockwell, Knoop, Leeb, and Meyer). There are different scales, denoted by a single letter, that use different loads or indenters. Rockwell to Brinell conversion chart (Brinell, Rockwell A,B,C) Struers hardness conversion table (Vickers, Brinell, Rockwell B,C,D) This page was last edited on 27 September 2020, at 21:09 (UTC). The Rockwell test measuring the depth of penetration of an indenter under a large load (major load) compared to the penetration made by a preload (minor load).
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