What is ISO 16859-2- Metallic materials- Leeb hardness test about?
ISO 16859-2 is a safety standard on metallic materials.
ISO 16859-2 specifies methods for direct and indirect verification of test instruments used for determining Leeb hardness in accordance with ISO 16859-1 and describes when these two types of verification are to be performed.
The direct verification involves checking that individual instrument performance parameters fall within specified limits, whereas the indirect verification utilizes hardness measurements of reference test blocks, calibrated in accordance with ISO 16859-3, to check the overall performance of the instrument for testing in the direction of gravity.
The indirect method can be used on its own for periodic performance checking in service.
Who is ISO 16859-2- Metallic materials- Leeb hardness test for?
ISO 16859-2 on verification and calibration of the testing devices is relevant to:
- Metallurgical engineers
- Manufacturers of testing devices
- Manufacturers of Leeb hardness testing instrument
- Testing authorities of Leeb hardness test
Why should you use ISO 16859-2- Metallic materials- Leeb hardness test?
ISO 16859-2 assists with the Leeb hardness test and its verification and calibration of the testing devices for metallic materials.
Before a Leeb hardness testing instrument is verified, the instrument shall be checked to ensure that it is properly set up and operating in accordance with the manufacturer’s instructions.
Especially it should be checked that:
- The impact body is correctly installed in the guide tube
- The support ring is mounted tightly to the bottom of the impact device
- Cables are correctly connected, if applicable
- The settings of the indicating unit are correct
Direct verification should be carried out at a temperature of (23 ± 5) °C. If the verification is made outside this temperature range, this shall be reported in the verification report.
Direct verification is comprised of the following:
- Verification of mass and geometry of impact body
- Verification of geometry of indenter ball, and of the hardness of the ball
- Verification of geometry of support ring
- Verification of impact velocity
Indirect verification should be conducted at a temperature of (23 ± 5) °C using reference test blocks calibrated in accordance with ISO 16859-3. If indirect verification is done out of this temperature range, a note must be included in the verification report/calibration certificate.
Overall, ISO 16859-2 is useful as it provides guidance on the Leeb hardness test and its verification and calibration of the testing devices for metallic materials which can be beneficial for your business.
