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. … 0.25. As the units are derived from these measurement methods, they are not suitable for direct comparison. Antimony () Brinell, Rockwell, Knoop, Leeb, and Meyer). Update Range. and not comma [,], i.e. 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). The harder the material, the higher the HR reading. 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. 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. % max. 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). For scratch, indentation, and rebound hardness, the measurement methods vary (e.g. % min. For decimal numbers, input period [.] There are different scales, denoted by a single letter, that use different loads or indenters. group a copper base alloys * hardness rockwell (hrb/hrc) ** conductivity % i.a.c.s. 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.
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