Premium 309S Cold Rolled Stainless Steel Sheet / Plate / Coil Excellent Oxidation Resistance up to 1000°C

Premium 309S Cold Rolled Stainless Steel Sheet / Plate / Coil Excellent Oxidation Resistance up to 1000°C

The Premium 309S Cold Rolled Stainless Steel Sheet/Plate/Coil is a high-alloy austenitic stainless steel specifically engineered for excellent oxidation resistance at elevated temperatures—up to 1000°C (1832°F). Here’s a detailed overview of its key features and applications:

Key Characteristics of 309S Stainless Steel:

• Grade Type: Austenitic stainless steel
• UNS Number: S30908
• Low Carbon Variant: The "S" in 309S denotes lower carbon content (≤0.020%) compared to standard 309, which minimizes carbide precipitation during welding and improves weldability and high-temperature performance.
• High Chromium & Nickel Content:
  • Cr: ~22–24%
  • Ni: ~12–15%
    → Enhances oxidation and corrosion resistance, especially in high-heat environments.

Advantages:

• Outstanding Oxidation Resistance: Stable and protective oxide layer forms at temperatures up to 1000°C, making it ideal for continuous high-temp service.
• Good Sulfidation Resistance: Performs well in sulfur-containing atmospheres.
• Excellent Creep Strength: Maintains mechanical integrity under prolonged thermal stress.
• Weldability: Low carbon content reduces risk of intergranular corrosion after welding.
• Cold Rolled Finish: Offers superior surface finish, dimensional accuracy, and mechanical properties compared to hot-rolled products.

 Common Applications:

• Furnace components (muffles, retorts, radiant tubes)
• Heat exchangers and recuperators
• Exhaust systems and manifolds
• Thermal processing equipment
• Petrochemical and power generation industries

Available Forms:

• Sheet: Thin gauges, typically <6 mm
• Plate: Thicker sections, >6 mm
• Coil: Continuous rolled form for fabrication or further processing

 Limitations:

• Not recommended for use in strongly reducing acids (e.g., sulfuric acid).
• Lower strength than some heat-resistant alloys (e.g., Inconel) above 1000°C.
• Susceptible to sigma phase embrittlement if held long-term between 600–900°C.

If you're sourcing or specifying 309S cold-rolled stainless steel, ensure compliance with standards such as ASTM A240/A240M (for plate/sheet/coil) and verify mill test reports for chemistry and mechanical properties.

Let me know if you need technical data sheets, equivalent grades (e.g., EN 1.4833, JIS SUS309S), or supplier recommendations!