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| Austenitic steel grade TP 904L |
Super-Austenitic Steels
TP 904L=UNS N08904=1.4539
This high-alloy austenitic is very resistant to attack from diluted sulphuric acid, phosphoric acid and acetic acid. It resists pitting in neutralchloride solutions. Its resistance to stress corrosion cracking in some hot chlorides is much superior to that of the lower nickel austenites. Thissteel has good formability and weldability. This material is present in all common standards like ASTM, DIN, BS and NFA, however with somedifferences. Design stresses up to 370°C are included in ASME II.
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