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China Manufacturer Special Steel High Quality 904L Super Austenitic Stainless Steel

904L super austenitic stainless steel (00cr20ni25mo4.5cu; UNS: N08904; en: 1.4539) is a kind of high alloy austenitic stainless steel with low carbon content. It has good corrosion resistance in dilute sulfuric acid and is specially designed for the environment with harsh corrosion conditions.
904L super austenitic stainless steel contains 14.0-18.0% chromium, 24.0-26.0% nickel and 4.5% molybdenum. 904L super austenitic stainless steel is a kind of low carbon, high nickel, molybdenum austenitic stainless and acid resistant steel. It is the proprietary material of H.S company of France. It has good activation passivation transformation ability, excellent corrosion resistance, good corrosion resistance in non oxidizing acids such as sulfuric acid, acetic acid, formic acid and phosphoric acid, good pitting corrosion resistance in neutral chloride medium, good crevice corrosion resistance and stress corrosion resistance. It is suitable for all kinds of sulfuric acid concentration below 70 ℃. It is resistant to acetic acid of any concentration and temperature under normal pressure, and has good corrosion resistance in the mixed acid of formic acid and acetic acid.

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Model: 904L (UNS N08904, 1.4539)

Ronsco 904L Parameter Table
SAE 904L stainless steel / 1.4539 / AISI 904L / UNS N08904 / X1NiCrMoCu25-20-5
Genenal Introduction
904L is a low carbon high alloy austenitic stainless steel which is widely used in applications where the corrosion properties of AISI 316L and AISI 317L are not adequate.
The addition of copper to this grade gives it corrosion resistant properties superior to the conventional chrome nickel stainless steels, in particular to sulphuric, phosphoric and acetic acids. However, there is limited use with hydrochloric acids. It also has a high resistance to pitting in chloride solutions, a high resistance to both crevice and stress corrosion cracking. Alloy 904L performs better than other austenitic stainless steels due to the higher alloying of nickel and molybdenum.

The grade is non-magnetic in all conditions and has excellent formability and weldability. The austenitic structure also gives this grade excellent toughness, even down to cryogenic temperatures.

The high chromium content promotes and maintains a passive film which protects the material in many corrosive environments.904L has a greater resistance to precipitation of ferrite and sigma phases on cooling and welding than other stainless steels containing molybdenum such as 316L and 317L. There is no risk of intercrystalline corrosion on cooling or welding due to the low carbon content. Its maximum service temperature is at 450°C.
Chemical Composition:
ContentCSi MnSNiCrPMoCuNFe

23.00 19.00 
4.00 1.00 

Max0.02 1.00 2.00 0.0328.00 23.00 0.040 5.00 2.00 0.10 BAL

Forms & Specifications
Bar & Profile: ASTM A276/ASME SA276
Thick Plate, Sheet & Strip: ASTM A240/ASME SA240,
Seamless pipe/tube: ASTM A312/ASME A312, ASTM A213/ASME SA213, ASTM A269/ASME SA269,
Welded nominal pipe: ASTM A312/ASME A312,  ASTM A269/ASME SA269, ASTM A249/ASME SA249
Pipe fittings: ASTM A403
Forgings: ASTM A182
Physical PropertiesApplication:
Density: 8.00g/cm³
Melting Point: 2372 –2534°F (1300–1390°C )
Specific Heat (0-100°C):  450 J.kg-1.°K-1
Thermal Conductivity: 11.5 W.m -1.°K-1
Thermal Expansion: 15.8 μm/μm/°C
Modulus Elasticity: 190 GPa
Electrical Resistivity: 9.52μohm/cm
Seawater cooling equipment
Chemical processing for sulphuric, phosphoric and acetic acids
Gas washing
Condenser tubes
Control and instrumentation
Heat exchangers

Chemical processing
Oil and gas
Typical Mechanical Properties:
ProductStandardYield Strength 0.2%
min. (mpa)
Tensile Strength
min.  (mpa)
Sheet & PlateASTM A240≥490≥220
Seamless Tube & PipeASTM A213≥490≥215
Seamless/Welded Tube and PipeASTM A312≥490≥215
Welded TubeASTM A249≥490≥215
Seamless/Welded TubingASTM 269

For More Information About 904L stainless steel(Pipes, Plates, Tubes, Sheets, Bars), please call +86 17708476248 or Send an Email to [[email protected]]

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