904L Stainless Steel Coil | The Ultimate Acid-Defying Alloy
✓ Sulfuric Acid Dominance: 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 Resilience: Maintains ductility from **-196°C to 400°C (-321°F to 752°F).
✓ Fabrication Precision: 22% nickel content prevents hot cracking during welding (AWS A5.9 ER385 filler recommended).
904L Stainless Steel Coil (UNS N08904)
Engineered to conquer the most aggressive chemical environments, 904L super austenitic stainless steel coil combines high molybdenum (4.5%) and copper (1.5%) content to dominate sulfuric, phosphoric, and acetic acid corrosion. Exceeding ASTM A240/A480 standards and compliant with ISO 17752 heavy metal restrictions, this nickel-chromium-molybdenum alloy sets the benchmark for chemical processing, pharmaceutical, and marine applications where conventional stainless steels falter.
Thickness: 0.5mm–80mm (cold-rolled ±0.02mm; hot-rolled ±0.5%)
Width: 300mm–2,000mm (slitting tolerance ±0.3mm)
Surface Finishes: 2B, BA, No.8 Mirror, or Electropolished (Ra ≤0.2μm)
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 |
| Coil Dimensions | Thickness: 0.5mm-150mm; Width: 1000mm-2500mm; Inner Diameter: 508mm/610mm (standard) |
| 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 Coil Applications
| Industry | Critical Use Cases | 904L Coil Advantage |
|---|---|---|
| Chemical Processing | Sulfuric acid concentrators, pickling tanks | 0.001mm/year corrosion rate in 98% H₂SO₄ at 40°C. |
| Pharmaceutical | API reactors, solvent recovery systems | Complies with FDA CFR 211.65 and 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 Coil Product Packaging
904L stainless steel coils are packaged in triple-sealed anti-static polyethylene packaging to prevent scratches, dust and oxidation during transportation. Each package is lined with VCI (vapor rust inhibitor) paper, which releases protective molecules to prevent rust in humid or salty environments, ideal for coastal construction or chemical industries. Bulk orders are secured on ISO-certified heavy-duty pallets with reinforced steel edges and weather-resistant shrink wrap to ensure stability for large-volume shipments. Environmentally conscious customers can choose FSC-certified recycled cardboard boxes or reusable aluminum packaging boxes, which can reduce landfill waste by 90%.
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 Duplex Stainless Steel Coil 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 provides superior sulfuric acid resistance at 60% lower cost. Use 254 SMO only for chloride >30,000ppm environments.
Q2: Does 904L require post-weld heat treatment?
A: No. Stabilized niobium (Nb) content prevents sensitization – weld in as-welded condition (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, use our 904L-HCl™ variant with laser-clad tantalum layer.
Q4: What certifications support pharmaceutical use?
Batch-specific documentation includes:
- ASTM E2906-13 Electropolishing Report
- USP <88> Class VI Biocompatibility Certificate
- EN 10204 3.1 MTC with Full PMI Traceability
Q5: How to prevent intergranular corrosion during fabrication?
A: Our pre-solution annealed coils (1050°C water-quenched) guarantee ASTM A262 Practice E compliance – free metallography report provided.
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