How to analyze Rockwell hardness test data?

Analyzing the test data of a Rockwell hardness tester requires consideration from multiple aspects.
It is necessary to check the rationality of the data to see if the test values are within the reasonable range of the selected scale. If the test value exceeds the scale range, it may be due to problems in the testing process, such as an incorrect scale selection or the specimen not meeting requirements.
Analyze the degree of dispersion of the data and calculate the standard deviation of multiple test results. If the standard deviation is large, it indicates that the repeatability of the test results is poor, which may be caused by an uneven specimen, unstable testing operations, or issues with the instrument. For the test data of the same batch of specimens, statistical analysis can be performed to calculate the average value and confidence interval to evaluate the overall hardness level of the batch.
In addition, the test data can be compared with relevant standards or historical data to determine whether the hardness of the specimen meets the requirements. If the test data is used for quality control, when the hardness value exceeds the specified range, the causes should be analyzed in time and corresponding measures should be taken.

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