Hardness testing of metal materials

2017-07-29View Original

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Dear sea friends, I have a question: How many points are generally taken when testing the hardness of metal materials? Do all of these sampled data points need to meet the standard requirements, or is it sufficient if just the average meets them? In other words, when some of the measured values are above the specified limit while the average value meets the standard requirements, is it considered qualified or not in such a case? For example: According to GB24511-2009, the hardness value for S30408 steel plates is required to be ≤201 on a HBW scale. Three testing points were taken to determine the hardness, with results of 189, 213, and 194 respectively. Is this considered acceptable in such a case? Are there any standards that provide detailed regulations on this aspect?

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Hardness testing of metal materials

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