Regarding stainless steel impact testing
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Stainless steel fittings, 250*8; the customer requires the material to meet the UG-84 standards for Charpy impact at -38°C. The average impact energy for the three specimens is 27 J; it is acceptable for the impact energy of any individual specimen to be lower than this average, but not below 20 J. Is this the standard for normal impact testing? I’m not very familiar with this; I hope everyone can give some advice
For foreign ASME standards, it is first necessary to determine the material type, then consult the relevant standard to find the impact values; if no specific impact requirements are specified, the requirements outlined in the domestic standards for that material should be considered
According to ASME standards, it is generally attempted to avoid impact tests, as there are few facilities in China capable of conducting such tests in compliance with ASME requirements
No way, the impact test is that difficult? The material is WP304
In accordance with the ASME Section II Material Standards, and for the specific stainless steel grades in question, an appropriate impact energy value is selected based on temperatures that are not lower than those required by the client, as well as the actual size of the samples taken
This customer is talking nonsense. . Austenitic stainless steels generally do not require impact resistance, as this material has a face-centered cubic structure and its toughness does not drop suddenly as the temperature decreases. According to ASME Standard, Volume 8-1, UHA-51, for 304 base material, the requirement is waived when the design metal temperature is greater than or equal to -196°C. . If it is to be done, the lateral expansion amount should be 0.38 mm. And this requirement from the customer can be easily met. . . I just can’t figure out what they’re thinking – are they trying to use carbon steel or some other low-alloy steel? And to conduct impact tests in accordance with ASME requirements, the laboratory needs to be accredited. . There are more now.