The Morehouse team can calibrate your Brinell hardness tester used for Brinell Hardness Testing.
The load is applied to the Brinell Calibrator, and the resulting deflection is read on the indicator.
The error of the hardness tester load is determined by dividing the deflection of the Calibrator under load by the difference between the actual deflection and the deflection for the calibrated load.
Morehouse uses deadweight primary standards to assign class AA calibrations as required per ASTM E10.
These calibrations are often performed in our small deadweight machines, easily capable of generating forces from 67.5 kgf through 3000 kgf.
Brinell hardness testing is likely the oldest method of hardness testing commonly used today and is used to determine the hardness of castings and forgings with a coarse grain structure.
The Brinell test itself is an indentation test where a known indenter, for a Brinell test, is a 10 mm ball applied perpendicularly to the material under test at a known force for a specified amount of time (dwell time).
At the end of the dwell time, the diameter of the resulting indentation is measured in at least two directions perpendicular to each other.
The Brinell hardness testing value is then determined from the mean of the diameter measurements, typically by chart or table based on a specific mathematical formula.
Brinell hardness testing uses approximately 25 different load/ ball combinations, so almost all metals can be tested using the Brinell test by simply varying the ball size and test force based on the sample’s dimension and design.
Results from Brinell Hardness testers are used throughout the industry as a basis for acceptance of commercial shipments and for quality control purposes. These results may correlate with other metallic characteristics such as ductility, tensile strength, wear resistance, etc.
Morehouse offers several load cell options to make the calibration of Brinell hardness testers simple.
For those following ASTM E10 for calibration of Brinell hardness testers, A2.6.3 states, "Verification of the Test Forces—For each Brinell scale that will be used, the associated test force shall be measured.
The test forces shall be measured by means of a Class AA elastic force measuring instrument having an accuracy of at least 0.05 %, as described in Practice E74."
This is where Morehouse can help with supplying load cells and calibration as Class AA calibration is done using primary deadweight standards.
