Convert steel hardness among Brinell, Rockwell C, Rockwell B, Vickers, and approximate tensile strength using ASTM E140 / SAE J417-style table interpolation.
Basis: ASTM E140 / SAE J417 conversion tables for steel. Table values are interpolated linearly between listed points; Rockwell B is reported only in its lower-hardness table range.
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Hardness conversion gives metallurgists, machinists, inspectors, and buyers a practical way to compare HB, HRC, HRB, and HV values when drawings or test reports use different scales. The calculator follows published conversion tables where applicable and flags that conversions are approximate because material, heat treatment, and test method affect the relationship.
No. Conversion tables are empirical and approximate. The relationship between scales changes with alloy, microstructure, heat treatment, and test conditions.
Only within the range and material class covered by a recognized table. Conversions outside the table range or across very different materials can be misleading.
It is only an estimate and is most defensible for steels within the applicable standard ranges. It should not replace tensile testing when a specification requires it.
The drawing should specify the required test method, scale, load, acceptance range, and standard. A converted value alone is not ideal for inspection control.
They use different indenters and loads and are intended for different hardness ranges. Near the ends of a scale, measurement uncertainty and conversion error increase.