Harmful phases in duplex steel
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When is it necessary to conduct analysis and testing on the harmful phases in duplex steel? The criteria for inspection? What are the acceptance criteria?
You can conduct testing in accordance with ASTM A923. We generally don’t do this for imported materials; for domestically produced ones, it is done based on the furnace batch number. If there is a test plate for the weld, it is best to carry out the test.
Then you had better take a look at the information on duplex steel
320~955: The precipitation of harmful phases with equal σ reduces impact toughness and corrosion resistance