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Density: 7.95 g/cm³
Equivalent designations:
Super duplex 904L, UNS N08904, DIN 14539
Available products: 
pipe, tube, bar, rod, wire, sheet, strip, bolt and nut, flange, pipe fittings

Inquiry
Product introduction
904L super austenitic stainless steel belongs to low carbon, high nickel, molybdenum austenitic stainless steel with acid resistance. It has good activation-passivation transformation ability and excellent corrosion resistance. It has good corrosion resistance in non-oxidizing acids such as sulphuric acid, acetic acid, formic acid and phosphoric acid. It also has good pitting resistance in neutral chloride-containing medium. Good crack corrosion resistance and stress corrosion resistance. Suitable for sulfuric acid of various concentration below 70 C. It also has good corrosion resistance in acetic acid of any concentration and temperature under atmospheric pressure and in mixed acid of formic acid and acetic acid.

Melting point of 904L: 1300-1390 ℃
The metallographic structure of 904L super austenitic stainless steel:
904L is a fully austenitic structure. Compared with austenitic stainless steel with high molybdenum content, 904L is insensitive to the precipitation of ferrite and alpha phase.

Chemical composition:
Grade UNS Chemical Component %
C Mn P S Si Cr Ni Mo N Cu
904L S08904 0.02 2.00 0.045 0.035 1.00 19.0-23.0 23.0-28.0 4.0-5.0 0.10 1.0-2.0
904L applications:
1. Petroleum and petrochemical equipment, such as reactors in petrochemical equipment.
2. Sulfuric acid storage and transportation equipment, such as heat exchangers.
3. Power plant flue gas desulfurization device, the main parts used are: absorber tower body, flue, baffle door plate, internals, spray system, etc.
4. Washer and fan in organic acid treatment system.
5. Seawater treatment equipment, seawater heat exchanger, paper industry equipment, sulfuric acid and nitric acid equipment, acid making, pharmaceutical industry and other chemical equipment, pressure vessels, food equipment.
6. Pharmaceutical factories: centrifuges, reactors, etc.
7. Vegetable food: soy sauce tank, cooking wine, salt tank, equipment and dressing.

Available products for 904L:
Welded pipe/tube
Seamless pipe/tube
Pipe fittings
Flanges
Bar/Profiles
Sheet/ Plate/Coil/Strip
Wire/Wire rope
Forgings
Welding Rod
Fastener

Test:

Packing: Anti-wet bag,wooden box,wooden pallet or as required.

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