Heat analysis shall be made to determine the percentages of the elements specified. ![]() The pipe shall be made by the seamless or an automatic welding process, with no addition of filler metal in the welding operation. ASTM A790 Standard for Duplex Stainless Steel PipeĪSTM A790 covers seamless and straight-seam welded ferritic/ austenitic duplex stainless steel pipe for general corrosive service, with particular emphasis on resistance to stress corrosion cracking.
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