409 Stainless Steel Plate

Walmay 409 stainless steel plate is a high-performance material engineered for temperature and corrosion resistance.

Designed with ultra-low carbon and titanium stabilization, it effectively prevents intergranular corrosion while offering cost savings—only 60% of the cost of 304 stainless steel.

  • High-Temperature Performance at Low Cost

    Nickel-free design ensures affordability. Walmay tests show oxidation rate ≤0.08mm/year at 600℃, making it suitable for mid-temperature environments.

  • Titanium Stabilization for Intergranular Corrosion Resistance

    Ti element stabilizes carbides, eliminating the need for post-weld heat treatment.

  • Flexible Supply & Rapid Delivery

    Over 200 tons of standard stock (0.5–6mm × 1219/1500mm) available for immediate shipment within 24 hours.

Product Specifications

Chemical Composition (GB/T 1220-2007)
Element C≤ Si≤ Mn≤ P≤ S≤ Cr Ti N≤
Content (%) 0.03 1 1 0.045 0.03 10.5–11.75 6×(C+N)–0.75 0.03
Physical & Mechanical Properties
Property Range Standard 304 Reference
Density 7.7 g/cm³ GB/T 7999 7.93 g/cm³
Melting Point 1427–1510℃ - 1398–1454℃
Tensile Strength ≥360 MPa GB/T 228.1-2021 ≥520 MPa
Yield Strength ≥175 MPa GB/T 228.1-2021 ≥205 MPa
Elongation ≥20% GB/T 228.1-2021 ≥40%
Hardness (HB) ≤183 GB/T 231.1-2009 ≤187
Oxidation Resistance (600℃) ≤0.08mm/year GB/T 13303 ≤0.1mm/year
Specifications & Supply
Process Type Thickness (mm) Width (mm) Length (mm) Surface Finish Tolerance
Cold Rolled 0.3–6.0 1000/1219/1250 (Mill Edge) 2000/2440/3000 2B / Passivated ±0.02mm
Hot Rolled 6.0–16.0 1500/1800/2000 6000 (fixed) NO.1 (Pickled) ±0.1mm

Customization Services:

Slitting (min width 50mm), laser cutting (any shape), and high-temperature passivation available. Custom widths (up to 1800mm) can be delivered within 7 days without delaying production schedules.

Pricing Calculation

Workshop & Manufacturing Machine

Stainless Steel Plate Bending/Stamping Process

Stainless Steel Plates on Storage Rack

Palletized Stainless Steel Plates

Stainless Steel Plate Rolling Line

Precision Thickness Inspection of Stainless Steel Plate

Forklift Loading Stainless Steel Plates for Shipment

Product Applications

  • Automotive Exhaust Systems

    Specification: 1.2mm × 1219 × 2440mm

    Case: Used in exhaust shields for a leading automaker. The 2B surface withstood 600℃ exhaust heat, offering 4× the service life of carbon steel at 30% lower cost.

  • Environmental Equipment

    Specification: 3mm × 1500 × 6000mm

    Case: Applied to industrial gas treatment systems. Hot-rolled NO.1 plate with passivation provided resistance to acid and alkaline fumes, extending maintenance cycles to 2 years.

  • Heat Exchangers

    Specification: 2mm × 1219 × 2440mm

    Case: Used in commercial HVAC heat exchanger fins. The 409 cold-rolled sheet improved thermal conductivity and achieved 95% material utilization after precision slitting.

  • Building Ventilation Systems

    Specification: 0.8mm × 1000 × 2000mm

    Case: Used in shopping mall ventilation ducts. The 2B surface provided strong magnetism for easy installation and 40% lower cost compared with 304.

FAQs

What are the main benefits of 409 stainless steel compared to 304?
409 offers good oxidation resistance and heat tolerance at a much lower cost, though its corrosion resistance is slightly lower than 304.
Can 409 be welded without post-weld heat treatment?
Yes. Titanium stabilization in 409 prevents carbide precipitation, eliminating the need for heat treatment after welding.
Is 409 stainless steel magnetic?
Yes, it is ferritic and magnetic in all conditions, which helps during installation and alignment in automotive and duct systems.
What is the temperature limit for 409 stainless steel?
It performs well up to 600–700℃, maintaining oxidation resistance ≤0.08mm/year, ideal for mid-temperature industrial use.
Does Walmay offer passivation and cutting services for 409 plates?
Absolutely. We provide high-temperature passivation, precision slitting (min width 50mm), and laser cutting to fit your custom designs.
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