Product Specification

EN 1.4539 / 904L Stainless Steel Plate & Sheets 4*8ft /1.5*6m SS Plate With EN 10204-3.1 Certificate

EN 1.4539 / 904L Stainless Steel Plate & Sheets – 4×8 ft (1.2×2.4 m) & 1.5×6 m Sizes – Supplied with EN 10204 3.1 Mill Test Certificate

Product Overview

We supply high-quality EN 1.4539 (UNS N08904, commonly known as 904L) stainless steel plates and sheets in standard and custom dimensions—including 4×8 feet (1.2×2.4 meters) and 1.5×6 meters—ideal for demanding applications in the chemical processing, pharmaceutical, oil & gas, marine, and pollution control industries. All material is manufactured to meet stringent international standards and is delivered with a full EN 10204 3.1 Mill Test Certificate, ensuring complete traceability, chemical compliance, and mechanical verification.

904L is a super austenitic stainless steel distinguished by its exceptional resistance to corrosion—particularly in acidic, chloride-rich, and reducing environments—thanks to its high alloy content of chromium, nickel, molybdenum, and copper.

Key Advantages of 904L (EN 1.4539)

• ✅ Outstanding corrosion resistance in sulfuric, phosphoric, acetic, and formic acids
• ✅ High resistance to pitting and crevice corrosion (PREN ≥ 34)
• ✅ Non-magnetic and weldable without post-weld heat treatment
• ✅ Excellent performance in seawater and flue gas desulfurization (FGD) systems
• ✅ Low carbon content (<0.02%) prevents sensitization during welding
• ✅ Fully compliant with ASTM A240, ASME SA-240, EN 10028-7, and ISO 9328-7

Available Dimensions & Tolerances

Note: 4×8 ft sheets are typically stocked in thinner gauges (1.5–12 mm), while thicker plates (12–50 mm) are commonly supplied in 1.5×6 m or cut-to-size.

Chemical Composition (EN 1.4539 / UNS N08904)

This composition delivers superior resistance to uniform and localized corrosion, especially in environments where 316L or duplex steels would fail.

Mechanical Properties (Typical at 20°C)

These properties ensure structural integrity under load while maintaining excellent ductility for forming and fabrication.

EN 10204 3.1 Mill Test Certificate – What It Includes

Every shipment includes an EN 10204 Type 3.1 certificate, issued by the manufacturer’s authorized quality representative, containing:

• Heat number and full traceability
• Actual chemical analysis (per element)
• Verified mechanical test results
• Compliance statement with EN 10028-7 / ASTM A240
• Signature and stamp from QA department

This documentation is essential for pressure equipment (PED 2014/68/EU), ASME projects, and quality audits in regulated industries.

Common Industrial Applications

904L is often specified where long service life, minimal maintenance, and safety-critical reliability are non-negotiable.

Fabrication & Machining Guidance

• Cutting: Excellent for laser, plasma, and waterjet cutting. Fiber lasers yield clean edges up to 25 mm thickness.
• Welding: Use ER385 or E385-16 filler. No preheat required; interpass temperature <100°C recommended.
• Forming: Good cold-forming capability; springback should be accounted for in tooling design.
• Machining: Slower speeds and rigid setups advised due to work-hardening tendency. Use carbide tools and ample coolant.

Packaging & Delivery

• Plates/sheets protected with anti-rust paper and PVC film
• Bundled on wooden pallets with edge protectors
• Export-ready packaging compliant with ISO 8377
• Global shipping via sea or air freight
• Lead time: 2–4 weeks (stock items may ship in 5–7 days)

Why Source From Us?

• ✅ Direct mill partnerships in Europe & Asia
• ✅ Full material certification (EN 10204 3.1) included
• ✅ In-house QC inspection before dispatch
• ✅ Cut-to-size and laser profiling services available
• ✅ Competitive pricing for bulk orders (MOQ: 500 kg)

Technical Support & Ordering

Need help selecting the right thickness or finish? Our metallurgical engineers provide free technical consultation to ensure your 904L material meets design and regulatory requirements.

Contact us today for:

• Quotation (with MTR preview)
• Sample request
• CAD/DXF-based nesting for optimized cutting
• Third-party inspection coordination (e.g., SGS, Bureau Veritas)

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