N08904 (904L) Super Austenitic Stainless Steel
N08904 (904L) Super Austenitic Stainless Steel Comprehensive Characteristics Analysis
N08904 (corresponding to 904L, European standard 1.4539) is a high-alloy super austenitic stainless steel. Through the coordinated design of high molybdenum (Mo), copper (Cu) and nickel (Ni), it shows excellent performance in strong acid, chloride and high temperature complex corrosion environments. It is an ideal corrosion-resistant material in the chemical, marine and energy fields.
Implementation standards:
ASTM A240/ASME SA-240, ASTM A276, ASTM A182/ASME SA-182, ASTM A312/ASMES A312, ASTM B625/ASME B625, ASTM B673/ASME B673
Internationally known as: 904L, Al-904L, UNS N08904, SUS890L, F904L, W.-Nr. 1.4539, NAS 255, 00Cr20Ni25Mo4.5Cu
Key performance indicators
1. Corrosion resistance:
Acidic medium: Excellent overall corrosion resistance in ≤40% sulfuric acid (≤50℃), phosphoric acid, and dilute hydrochloric acid, better than 316L and 317L;
Chloride environment: Pitting resistance equivalent index (PREN=Cr+3.3Mo+16N) ≥35, resistant to seawater and salt spray corrosion, suitable for marine engineering.
2. Mechanical properties:
Tensile strength at room temperature ≥490MPa, yield strength ≥220MPa, elongation ≥35%, with both high strength and plasticity.
3. Physical properties:
Density 7.95-8.24g/cm³, melting point 1300-1390℃, non-magnetic, short-term use temperature up to 400℃, long-term service recommended ≤250℃135.
N08904 (904L) is widely used in the following scenarios due to its excellent corrosion resistance:
1. Chemical and petrochemical: sulfuric acid reactors, phosphoric acid evaporators, acetic acid storage tanks, strong acid corrosion resistance and intergranular corrosion resistance;
2. Marine engineering: seawater desalination equipment, marine pumps and valves, submarine pipelines, resistance to chloride ion pitting and seawater erosion;
3. Environmental protection and energy: flue gas desulfurization (FGD) systems, nuclear waste treatment containers, resistance to mixed acid (H₂SO₄+Cl⁻) media;
4. Oil and gas: oil and gas field pipelines containing hydrogen sulfide (H₂S), acidic oil well equipment, resistance to sulfide stress corrosion cracking (SSCC)
Q:Can you send samples?
A:Of course, we can send samples to all parts of the world, our samples are free, but customers need to bear the courier costs.
Q:What product information do I need to provide?
A:You need to provide the grade, width, thickness, coating and the number of tons you need to purchase.
Q:About product prices?
A:Prices vary from period to period due to cyclical changes in the price of raw materials.
Q:What are the certifications for your products?
A:We have ISO 9001, SGS, EWC and other certifications.
Q:How long does your delivery time take?
A:In general, our delivery time is within 7-45 days, and may be delayed if the demand is extremely large or special circumstances occur.
Q:Can I go to your factory to visit?
A:Of course, we welcome customers from all over the world to visit our factory.
Q:Does the product have quality inspection before loading?
A:Of course, all our products are strictly tested for quality before packaging, and unqualified products will be destroyed.
Q:How to pack the products?
A:The inner layer has a waterproof paper outer layer with iron packaging and is fixed with a fumigation wooden pallet. It can effectively protect products from corrosion during ocean transportation.
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