Brinell vs. Rockwell Hardness: Comparison table. High Rockwell hardness numbers represent hard materials and low numbers soft materials. El ensayo de dureza de Rockwell se realiza de forma bastante similar al de Brinell. Rockwell C is used for harder metals such as steels. Rockwell testing falls into two categories: Regular Rockwell testing (e.g., C and B scales) and Rockwell superficial testing (e.g., 30 N and 30 T scales). In 1919, he amended the patent to include the Rockwell scale chart. The Rockwell B scale uses a 1/16-inch diameter ball indenter with a 100-kg load. Rockwell Hardness Test 1. Summary of Brinell Verses Rockwell Hardness. There are many Rockwell hardness scales, depending on the type of indenter and load used. En la práctica las escalas más difundidas son la B y C. El número de dureza Rockwell se denota como HR seguido de la letra mayúscula de la escala así: 64 HRC Esta notación indica una dureza Rockwell de 64 unidades en la escala C (diamante, carga total 150 kgf) Al indentador y a la carga utilizada para las mediciones se les asigna una letra (A o B, por ejemplo). 2. Ensayo de Rockwell. For Rockwell’s test there is the possibility of a cone breakage and the imprecision ± 2 HRB / HRC. When conducting Rockwell Hardness tests most metals are tested several times, and the average hardness value as well as the standard deviation are reported. Se aplica presión sobre una muestra de trabajo con una pieza con punta de acero o de diamante esférica. d 2 www.wilsoninstruments.com Fundamentals of Rockwell Hardness Testing These conversion charts are provided for guidance only as each scales uses different methods of measuring hardness. First minor load is applied to achieve zero level then major load is applied for specific period. The Brinell and Rockwell methods fall into the group of statistical methods of hardness testing. For example, the Rockwell C scale uses a cone-shaped, diamond-tipped indenter with a 150-kg load. This table shows approximate hardness of steel using Brinell, Rockwell B and C and Vickers scales. While industrial knife steel rating usually falls in a number associated with the Rockwell C scale, there are 30 different scales on the patented Rockwell scale chart. The Rockwell hardness is based on difference of indentation depth of indenter from two different load applications. Hardness Conversion Table related to Rockwell C Hardness Scale (hard materials) (non-colour) Hardness Conversion Chart related to Rockwell C Hardness Scales (hard materials) Estimated Hardness Equivalent Chart related to Rockwell C and Vickers (hard materials) Hardness Conversion Table related to Rockwell B Hardness Scale (soft metals) (colour) Steel Hardness Conversion Table. Rockwell B measures softer metals such as brasses. C is the most common scale used for knife blade ratings, followed by the B scale. 3.
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