Premium 904L Stainless Steel Sheet Ideal for Chemical and Marine Applications

Premium 904L Stainless Steel Sheet – Ideal for Chemical and Marine Applications

Product Overview

904L stainless steel sheet (UNS N08904, EN 1.4539) is a premium-grade, super austenitic alloy engineered for maximum corrosion resistance in the most aggressive chemical, marine, and industrial environments. With its unique blend of high nickel, chromium, molybdenum, and copper content, 904L outperforms standard austenitic grades like 316L and even many duplex stainless steels—making it the material of choice for critical applications where failure is not an option.

Our premium 904L sheets are available in both cold-rolled (for precision) and hot-rolled annealed & pickled (HRAP) finishes, with thicknesses ranging from 0.5 mm to 12.0 mm, and standard sizes including 1000×2000 mm, 1219×2438 mm (4×8 ft), and custom dimensions. Every coil or sheet is supplied with a full EN 10204 3.1 Mill Test Certificate, ensuring complete traceability and compliance with ASTM A240, ASME SA-240, and EN 10088-2 standards.

Why Choose 904L for Chemical & Marine Use?

904L was specifically developed to handle environments that rapidly degrade conventional stainless steels. Its exceptional performance stems from a carefully balanced chemistry:

• High Nickel (23–28%): Provides stability in reducing acids
• Molybdenum (4–5%) + Chromium (19–23%): Delivers outstanding resistance to pitting and crevice corrosion
• Copper (1–2%): Enables reliable service in sulfuric acid across a wide concentration range
• Ultra-Low Carbon (≤0.02%): Eliminates sensitization during welding—no post-weld heat treatment required

This results in a Pitting Resistance Equivalent Number (PREN) of 34–36, placing 904L among the most corrosion-resistant stainless steels commercially available.

Key Performance Advantages

✅ Unmatched Sulfuric Acid Resistance
— Stable in concentrations from 0% to 98% at temperatures up to 40°C; usable up to 70°C in dilute solutions.

✅ Superior Chloride Resistance
— Resists pitting and stress corrosion cracking (SCC) in seawater, brine, bleach, and coastal atmospheres.

✅ Excellent Weldability & Formability
— Can be welded using standard TIG, MIG, or SMAW processes with matching filler (e.g., ER385). Cold-rolled sheets offer tight bend radii for complex fabrications.

✅ Non-Magnetic & Ductile
— Ideal for instrumentation, sensors, and cryogenic applications where magnetic interference must be avoided.

✅ Long Service Life = Lower TCO
— Despite higher initial cost, 904L drastically reduces maintenance, downtime, and replacement frequency—delivering superior total cost of ownership.

Available Product Forms & Specifications

Chemical Composition (Weight %)

All batches undergo spectrographic analysis and are documented in the MTR.

Mechanical Properties (Typical at 20°C)

Cold-rolled material may exhibit slightly higher strength due to work hardening but retains excellent ductility.

Industry-Specific Applications

Chemical Processing

• Sulfuric & phosphoric acid storage tanks
• Reactor linings, distillation columns
• Pump casings, valve bodies, and piping systems

Marine & Offshore

• Seawater intake and cooling systems
• Desalination plant components
• Subsea instrumentation housings
• Shipboard chemical handling units

Pharmaceutical & Biotech

• Sterile fluid pathways
• Mixing vessels and filtration housings
• Cleanroom equipment requiring non-contaminating surfaces

Environmental Engineering

• Flue gas desulfurization (FGD) scrubbers
• Wastewater treatment tanks exposed to chlorides or acids

Fabrication Guidelines

• Cutting: Excellent for fiber laser, waterjet, and CNC punching. Use nitrogen assist for clean, oxide-free edges.
• Welding: Use ER385 or E385-16 consumables. Maintain interpass temperature <100°C. No preheat or PWHT needed.
• Forming: Cold-rolled sheets support tight bends (min. radius ≈ 2× thickness). Annealing not required post-forming.
• Machining: Moderate machinability—use sharp carbide tools, low speeds, high feed, and ample coolant to manage work hardening.

Quality Assurance & Packaging

• Each shipment includes heat number traceability and EN 10204 3.1 certification
• Sheets protected with interleaved paper and PVC film to prevent surface damage
• Packed on export-standard wooden pallets with moisture barrier wrapping
• Optional services: ultrasonic testing (UT), surface roughness reports, third-party inspection (SGS, Bureau Veritas)

Sustainability & Compliance

904L stainless steel is:

• 100% recyclable with high scrap value
• Compliant with REACH, RoHS, and PED 2014/68/EU (for pressure equipment)
• Supports ESG goals through extended asset life and reduced environmental risk

Order Today – Engineered for Extreme Environments

We supply premium 904L stainless steel sheets globally with:

• Fast lead times (stock & mill-direct options)
• Custom cutting and profiling (DXF/DWG accepted)
• Technical support from metallurgical engineers
• Competitive pricing for volume orders (MOQ: 300 kg)

Request a quote, sample, or certified test report today—and equip your next project with the corrosion defense only 904L can deliver.

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