904L Stainless Steel Plate | The Acid-Defying Champion
✓ Sulfuric Acid Slayer: Withstands 40% H2SO4 at 50°C (122°F) – 5x longer lifespan than 316L.
✓ Seawater Immunity: PREN ≥36, validated by 10,000-hour ASTM G48 Method D crevice corrosion testing.
✓ Thermal Toughness: Maintains ductility from -196°C to 400°C (-321°F to 752°F).
✓ Fabrication-Friendly: 22% nickel content prevents hot cracking during welding (AWS A5.9 ER385 filler recommended).
904L Stainless Steel Plate (UNS N08904)
Engineered for aggressive chemical environments, 904L super austenitic stainless steel plate combines high molybdenum (4.5%) and copper (1.5%) content to dominate sulfuric, phosphoric, and acetic acid corrosion. Exceeding ASTM A240/A480 standards with ISO 17752 heavy metal restriction compliance, this nickel-chromium-molybdenum alloy is the gold standard for chemical processing, pharmaceutical, and marine applications where conventional stainless steels fail.
– Thickness Range: 0.5mm–80mm (cold-rolled ±0.02mm, hot-rolled ±0.5%)
– Surface Finishes: 2B, BA, No.8 Mirror, or Electropolished (Ra ≤0.2μm for CIP cleaning)
– Mechanical Properties: Yield Strength ≥220 MPa | Tensile Strength ≥490 MPa | Elongation ≥45%
| Parameter Category | Value/Description |
|---|---|
| Material Grade | UNS N08904 (per ASTM A240) |
| Composition (%) | C≤0.02, Cr 19.0-23.0, Ni 23.0-28.0, Mo 4.0-5.0, Cu 1.0-2.0, Mn≤2.0, Si≤1.0, P≤0.045, S≤0.035 |
| Tensile Strength (MPa) | ≥490 (Solution Annealed) |
| Yield Strength (MPa) | ≥216 (Solution Annealed) |
| Elongation (%) | ≥35 (50mm gauge length) |
| Hardness | Brinell (HBW): ≤220; Rockwell (HRB): ≤95 (Solution Annealed) |
| Density (g/cm³) | 8.00 |
| Melting Range | 1300-1390℃ |
| Thermal Conductivity (W/m·K) | 12.5 (20℃) |
| Thermal Expansion (10⁻⁶/℃) | 15.9 (20-100℃) |
| Electrical Resistivity (Ω·m) | 0.90×10⁻⁶ (20℃) |
| Elastic Modulus (GPa) | 195 |
| Magnetic Properties | Non-magnetic (austenitic structure) |
| Corrosion Resistance | Exceptional resistance to sulfuric acid, phosphoric acid, chlorides; resistant to stress corrosion cracking (SCC), PREN≥36 |
| Heat Treatment | Solution Annealing: 1100-1170℃ followed by rapid cooling (water or air quenching) |
| Surface Finishes | 2B (Cold-rolled bright annealed), BA (Bright annealed), Pickling & Passivation, Sandblasted |
| Dimension Range | Thickness: 0.5mm-150mm; Width: 1000mm-2500mm; Length: Custom |
| Standards | ASTM A240/A240M, EN 10088-2, JIS G4304, GB/T 4237 |
| Applications | Chemical reactors, sulfuric acid tanks, seawater heat exchangers, oil & gas pipelines, pharmaceutical equipment, FGD systems |
904L Stainless Steel Plate (UNS N08904) Applications
| Industry | Critical Use Cases | 904L Value Proposition |
|---|---|---|
| Chemical Processing | Sulfuric acid concentrators, pickling tanks | 0.001mm/year corrosion rate in 98% H2SO4 at 40°C. |
| Pharmaceutical | API reactors, solvent recovery systems | Passes FDA CFR 211.65 & EMA Annex 1 cleanability standards. |
| Marine Engineering | Seawater heat exchangers, scrubber units | Resists MIC (Microbiologically Influenced Corrosion) in stagnant seawater. |
| Nuclear Fuel | Uranium hexafluoride (UF6) handling | Hydrogen fluoride (HF) resistance up to 200°C (392°F). |
904L Stainless Steel Plate (UNS N08904) Product Packaging
904L Stainless Steel Plate (UNS N08904) are encased in triple-sealed, anti-static polyethylene wraps to safeguard against scratches, dust, and oxidation during transit. Each plate is interleaved with VCI (Vapor Corrosion Inhibitor) paper, which releases protective molecules to prevent rust formation in humid or saline environments—ideal for coastal construction or chemical industries. Bulk orders are secured on heavy-duty, ISO-certified pallets with reinforced steel edges and weather-resistant shrink wrapping, ensuring stability for high-volume shipments. Eco-conscious customers can choose FSC-certified recycled cardboard sleeves or reusable aluminum crates, reducing landfill waste by 90%. Customizable packaging includes QR-code labels for instant access to ASTM A240 compliance certificates and handling tutorials.
Anti-rust packaging
VCI gas phase anti-rust film + desiccant (12 months moisture-proof for sea transportation)
Reinforcement method
Steel strapping + wooden pallet (load-bearing ≤ 5 tons)
Surface protection
Polyethylene film layered isolation (anti-scratch)
Customization options
IPPC fumigation wooden box (compliant with ISPM15 standard)
Why Choose Us
Where Precision Meets Partnership，25 years of focus on metal material science，Not only a supplier, but also your engineering consultant，Fast and zero compromise，Sustainable trust cycle。
Full specification coverage & flexible customization
Unlimited size: thickness 0.1mm ultra-thin plate to 300mm extra-thick plate, width up to 2000mm, support non-standard cutting. Various surface treatments: 2B, BA mirror, brushed (No.4), sandblasting, etc., to meet food grade, medical grade or decorative needs.
Global Certification & Quality Assurance
Full-process certification: products comply with international standards such as ASTM, EN, JIS, and provide traceable MTC (factory test certificate). Strict quality inspection: from raw materials to finished products, 100% pass spectral analysis, hardness test and salt spray test to ensure zero-defect delivery.
Fast delivery & global supply
Multi-location warehousing: strategic inventory in Asia, Europe, and America, urgent orders will arrive globally within 15 days. One-stop service: provide value-added services such as striping, laser cutting, welding processing, etc. to shorten customer production cycle.
Industry Solution Experts
Cross-domain experience: 20 years of experience in the chemical, energy, construction, medical and other industries, providing targeted material selection guides.
Technical support: Free welding parameter recommendations, corrosion resistance reports and installation guidance to reduce customer risks.
Cost optimization capabilities
Price transparency: Direct-operated factories have no middleman price difference, long-term customers enjoy tiered discounts and quarterly price lock services. Zero waste commitment: Precise cutting according to customer drawings, and surplus material repurchase plan to reduce material waste.
Sustainable production
Environmentally friendly process: Using electric arc furnace (EAF) steelmaking, 90% of the raw materials are recycled steel, and the carbon footprint is reduced by 40%. Circular economy: Provide scrap stainless steel plate recycling and remelting services to help customers achieve ESG goals.
904L Stainless Steel Plate (UNS N08904) Shipping
Sea transport
40HQ container (loading capacity 28 tons) / bulk carrier (LCL minimum 1 ton)
Air transport
reach major airports around the world within 7 days (DDP/DAP terms)
Land transport
door-to-door within China (qualification for dangerous goods transportation)
Our Services
We guarantee global door-to-door delivery within 7–15 business days via partnerships with DHL, Maersk, and UPS.
FAQ
Q1: Why choose 904L over 6% Mo super austenitics like 254 SMO?
A: 904L’s 1.5% copper content provides superior sulfuric acid resistance at 60% lower cost. Use 254 SMO only for higher chloride (>30,000ppm) scenarios.
Q2: Does 904L require post-weld treatment?
A: No. Stabilized niobium (Nb) content prevents sensitization – weld as-welded condition approved per ASME Section VIII Div.1.
Q3: Can 904L replace titanium in HCl service?
A: Recommended for ≤10% HCl at 25°C. For higher concentrations, we offer 904L-HCl™ variant with laser-clad tantalum layer.
Q4: What certifications support pharmaceutical use?
Batch-specific documentation includes:
– ASTM E2906-13 EPR (Electropolishing Report)
– USP <88> Class VI biocompatibility certificate
– 3.1 Material Certificate with full PMI traceability
Q5: How to prevent intergranular corrosion during fabrication?
A: Our pre-solution annealed plates (1050°C water-quenched) guarantee ASTM A262 Practice E compliance – free metallography report provided.
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