Product Specification

UNS S30403 304L Stainless Steel Plate Non-Magnetic, Formable, and Highly Durable in Mild Environments

UNS S30403 304L Stainless Steel Plate – Non-Magnetic, Highly Formable, and Durable in Mild Environments

Product Overview

UNS S30403 (AISI 304L) stainless steel plate is the low-carbon variant of the world’s most widely used austenitic stainless steel, engineered for applications demanding excellent formability, non-magnetic properties, and reliable corrosion resistance in mild to moderately aggressive environments.

With a maximum carbon content of 0.03%, 304L eliminates the risk of chromium carbide precipitation during welding—ensuring intergranular corrosion resistance in as-welded conditions without requiring post-weld heat treatment. This makes it ideal for fabricated structures, cryogenic vessels, architectural panels, food processing equipment, and electronic enclosures where magnetic interference must be avoided.

Manufactured to ASTM A240/A240M, ASME SA-240, and EN 10088-2 (1.4307) standards, our 304L plates offer consistent metallurgical quality, full traceability, and global compliance.

Key Characteristics

⚠️ Note: Cold working may induce slight magnetism, but this is typically negligible for most non-critical applications.

Technical Specifications

Chemical Composition (Typical – wt%, per ASTM A240)

• UNS: S30403
• EN: 1.4307
• AISI: 304L

Mechanical Properties (Annealed Condition)

Why Choose 304L for Non-Magnetic & Formable Applications?

✅ Electronics & Medical: Safe for use near sensitive instruments (e.g., MRI machines, lab equipment)
✅ Architectural Interiors: Brushed or mirror finishes with no magnetic attraction—ideal for modern design
✅ Food & Pharma: Smooth, non-porous surfaces support hygiene and CIP/SIP cleaning
✅ Cryogenic Tanks: No embrittlement at ultra-low temperatures
✅ Custom Fabrication: Easily formed into complex shapes—hoods, trays, ducts, enclosures

Unlike ferritic or martensitic steels, 304L’s stable austenitic structure ensures dimensional stability and aesthetic consistency after forming or welding.

Available Product Details

All plates are stored indoors to prevent surface contamination and maintain finish integrity.

Ideal Applications by Sector

Fabrication Best Practices

• Forming: Excellent cold formability; springback is moderate. Anneal if severe deformation causes work hardening.
• Welding: Use ER308L filler. Maintain interpass temp <150°C. No post-weld annealing needed.
• Machining: Moderate machinability—use rigid setups, sharp tools, and high lubrication.
• Finishing: Electropolishing enhances non-magnetic surface purity and corrosion resistance.
• Handling: Avoid contact with carbon steel tools to prevent iron contamination (can cause rust spotting).

Quality Assurance

Every delivery includes:

• Mill Test Report (MTR) with chemical & mechanical data
• Positive Material Identification (PMI) via XRF/OES
• Optional surface roughness (Ra) certification for hygienic applications
• Full compliance with ASTM, ASME, EN, FDA (where applicable)

Material sourced from ISO-certified mills with strict melt chemistry control.

Sustainability & Lifecycle Benefits

• 100% recyclable with high scrap value
• Low environmental impact due to long service life and minimal maintenance
• Energy-efficient over decades of use
• Supports green building and circular economy initiatives

Order Information

• MOQ: 1 piece (cut-to-size); 500 kg (mill order)
• Lead Time:
  • Stock: 3–7 working days
  • Mill production: 3–5 weeks
• Value-Added Services:
  ✅ Precision laser/waterjet cutting
  ✅ Edge deburring & radius forming
  ✅ Surface polishing (Ra 0.4–3.2 µm available)
  ✅ VCI packaging for export
• Global Shipping: FOB, CIF, or DDP terms

Contact us for a free sample, material data sheet, or application-specific consultation.

Conclusion

When your project demands a non-magnetic, highly formable, and durable stainless steel that performs reliably in mild environments, UNS S30403 304L plate delivers the perfect balance of functionality, safety, and cost-efficiency. Trusted across industries from healthcare to architecture, it remains the benchmark low-carbon austenitic stainless steel for smart, sustainable engineering.