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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
  • Ronsco
904L (N08904, 14539) 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.
904L 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:
Content C Si  Mn S Ni Cr P Mo Cu N Fe

23.00  19.00 
4.00  1.00 

Max 0.02  1.00  2.00  0.03 28.00  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 Properties Application:
Density: 8.00g/cm³
Melting Point: 2372 –2534°F (1300–1390°C )
Specific Heat (0-100°C):  450°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:
Product Standard Yield Strength 0.2%
min. (mpa)
Tensile Strength
min.  (mpa)
Sheet & Plate ASTM A240 ≥490 ≥220
Seamless Tube & Pipe ASTM A213 ≥490 ≥215
Seamless/Welded Tube and Pipe ASTM A312 ≥490 ≥215
Welded Tube ASTM A249 ≥490 ≥215
Seamless/Welded Tubing ASTM 269

Product Name 904L, UNS N08904, WNR 1.4539
Type  Welded / Seamless
Shape  Square / Rectangular / Round
Grade  Stainless steel 304 / 304L / 310S / 316L / 317L / 904L / 2205 / 2507 / 32760 / 253MA / 254Mo / S31803 / S32750 / S32205 etc
Monel 400 / Monel K-500 
Inconel 600 / Inconel 601 / Inconel 625 / Inconel 617 / Inconel 690 / Inconel 718 / Inconel X-750
Incoloy A-286 / Incoloy 800 / Incoloy 800H / Incoloy 800HT
Incoloy 825 / Incoloy 901 / Incoloy 925 / Incoloy 926
Nimonic 75 / Nimonic 80A / Nimonic 90 / Nimonic 105 / Nimonic 263 / Nimonic L-605
Hastelloy B / Hastelloy B-2 / Hastelloy B-3 / Hastelloy C / Hastelloy C-276 / Hastelloy C-22
Hastelloy C-4 / Hastelloy C-200 / Hastelloy G-35 / Hastelloy X / Hastelloy N
Austenitic stainless steel 904L / XM-19 / 316Ti / 316LN / 371L / 310S / 253MA
DP steel 254SMo / F50 / 2205 / 2507 / F55 / F60 / F61 / F65 
PH stainless steel 15-5PH / 17-4PH / 17-7PH 
Out diameter  Welded Pipe 1.9mm - 5000mm or customized
Thickness  Welded Pipe 0.5mm - 80mm or customized
Max Length  Welded Pipe 50000mm or customized
Finish  2B, Pickling, polished, brushed, sandblast, BA, EP,
Packing  waterproof polybag, wooden box, end cap, wooden crame/pallet
Inspection  TUV,SGS,BV,ABS,LR and so on
Application  Chemical, Pharmaceutical & Bio-Medical, Petrochemical & Refinery, Environmental, Food Processing, Aviation, Chemical Fertilizer, Sewage Disposal, Desalination, Waste Incineration etc. 
Processing Service  Machining : Turning / Milling / Planing / Drilling / Boring / Grinding / Gear Cutting / CNC Machining  
Deformation processing :  Bending / Cutting / Rolling / Stamping 
Delivery Time 7-40 days
Payment  T/T, L/C,D/A,D/P, Western Union,MoneyGram,According to customer requirements payments for offline orders.
Transportation By air, by sea, by train, by truck
Sample Free
Warranty Trade assurance after sales service

Production flow chart of seamless pipe1

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