JIMI STEEL MILL LIMITED

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904L is an austenitic stainless steel. It is softer than 316L, but its molybdenum addition gives it superior resistance to localized attack (pitting and crevice corrosion) by chlorides and greater resistance reducing acids; in particular, its copper addition gives it useful corrosion resistance to all concentrations of sulphuric acid. Its high alloying content also gives it greater resistance to chloride stress corrosion cracking, but it is still susceptible. Its low carbon content makes it resistant to sensitization by welding and which prevents intergranular corrosion.

Composition:

Nickel, 23–28%

Chromium, 19–23%

Carbon, 0.02% maximum

Copper, 1–2%

Molybdenum, 4–5%

Manganese, 2% maximum

Silicon, 1.0% maximum

Iron, (balance)

Other names:

UNS N08904

EN 1.4539

SUS 904L

SS2562

Mechanical behavior:MIN