Standard Hardness Conversion Tables for Metals provide essential hardness scale conversion data between seven major testing methods. These comprehensive charts accurately show the relationship among Brinell hardness, Vickers hardness, Rockwell hardness, and four other measurement systems, including Superficial hardness, Knoop hardness, Scleroscope hardness, and Leeb hardness.
Engineers and metallurgists should note that converting hardness values between different test methods is an approximate process, as each hardness measurement scale evaluates slightly different material properties. Our scientifically validated hardness conversion tables account for these variations to provide the most reliable metals hardness comparison data available.
The Webster to Brinell hardness conversion is essential for industries testing soft metals, elastomers, and plastics, where both scales are commonly used. Since Webster hardness testers typically measure softer materials (0-100 HW), while Brinell hardness (HB) applies to a broader range, conversion requires careful reference to standardized charts.
Because of the wide range of variation among different materials, it is not possible to state confidence limits for the errors in using a conversion chart. Even in the case of a table established for a single material, such as the table for cartridge brass, some error is involved depending on the composition and methods of processing.
Because of their approximate nature, conversion tables must be regarded as only an estimate of comparative values. It is recommended that hardness conversions be applied primarily to values such as specification limits, which are established by agreement or mandate, and that the conversion of test data be avoided whenever possible.
Conversion of hardness values should be used only when it is impossible to test the material under the conditions specified, and when conversion is made it should be done with discretion and under controlled conditions. Each type of hardness test is subject to certain errors, but if precautions are carefully observed, the reliability of hardness readings made on instruments of the indentation type will be found comparable.
Differences in sensitivity within the range of a given hardness scale may be greater than between two different scales or types of instruments. The conversion values, whether from the tables or calculated from the equations, are only approximate and may be inaccurate for specific application.
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