Execution standard of hardness tester

In the field of material property testing, the execution standards for hardness testers are the core elements to ensure the high accuracy and reliability of hardness test results. These standards are not only the cornerstone of industry norms but also the key to ensuring the repeatability and comparability of measurement data.

The measurement method is also an important part of the execution standards, which describes in detail the operation details such as how to correctly select the test location, the way of applying the test force, and the holding time. For different materials and hardness ranges, the standards will provide corresponding recommended measurement methods to avoid errors caused by improper operation. Taking the Brinell hardness test of metal materials as an example, it is required to reasonably select the indenter diameter and test force according to the thickness of the material and the expected hardness value, and the holding time of the test force is usually between 10 - 30 seconds.

The accuracy requirement is an important indicator to measure the performance of a hardness tester. The execution standards clearly specify the allowable errors under different hardness ranges. For example, in the Rockwell hardness test, the indication errors of the HRA, HRB, and HRC scales shall not exceed ±2HRA, ±4HRB, and ±3HRC respectively, to ensure that the measurement results are within an acceptable error range.

The calibration process is also a key link in the execution standards. Hardness testers are required to be calibrated regularly to ensure that their performance always meets the standard requirements. The calibration process requires the use of standard hardness blocks and strict operation in accordance with the specified procedures. Calibration data should be recorded and analyzed and evaluated.

The operation specifications impose restrictions on the use of hardness testers from aspects such as personnel qualifications and environmental conditions. Operators must undergo professional training and be familiar with the operation methods and safety precautions of the hardness tester. The temperature, humidity, and other conditions of the test environment also need to meet the standard requirements to avoid the influence of environmental factors on the test results.