The low carbon content in 904L, also known as Uranus B6®, makes this non-stabilized austenitic alloy resistant to sulfuric acid. It is non-magnetic, and is resistant to corrosion cracking and crevice corrosion.

904L and Uranus B6® material specification and equivalents

European (DIN) Werkstoff number 1.4539
Unified Numbering System (UNS) N08904
Type X1NiCrMoCu25-20-5

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