Solve "About Impact”
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ask: 1. After the 304 material is used as a welding process qualification test piece, the impact test is not required. 2. If the impact test is performed on low-temperature 304 material, how to obtain the test value? There are no relevant values in the GB3082 standard or the material book. 3. Whether the product test piece is subjected to impact. Hope Haiyou can give a correct explanation. Regarding the welding evaluation in JB4708, there is no mention of stainless steel impact.
Austenitic stainless steel - no need to make it above 196 degrees》
If it's -196, how can I check the hemp value?
The lower limit of the operating temperature range of 304 is -196°C. Within the range, austenitic stainless steel has high toughness and good toughness. There is no need for impact, and the result is super high. In fact, the low-temperature brittle transition temperature of austenitic stainless steel is much lower than -196. It is difficult to understand the specific temperature at which the transition will occur.
In Appendix C of GB150, there is an article "If the design temperature is lower than -100°C, the low-temperature Charpy impact test of weld metal should be carried out in accordance with JB4708, and it shall comply with...". ”In this way, it is not like what the friend above said that if it is higher than -196, it will not be done.
Has anyone answered this? It was due to discussion.