309S Stainless steel coil is a high-alloy austenitic stainless steel designed for exceptional oxidation resistance and sustained performance in high-temperature environments. Its elevated chromium and nickel content ensures superior corrosion resistance and remarkable thermal stability compared to standard 300-series grades. This product is ideally suited for applications involving frequent thermal cycling and continuous exposure to extreme heat.

Key Features & Advantages

• Excellent High-Temperature Resistance: Demonstrates outstanding oxidation resistance up to 1150°C (2100°F), making it ideal for intermittent use. For continuous service, recommended temperatures are up to 1050°C (1950°F).

• Superior Corrosion Resistance: Offers enhanced resistance to oxidation, corrosion, and carburization compared to grades like 304/304L, particularly in corrosive high-temperature atmospheres.

• Low Carbon Content (Suffix 'S'): The low carbon content (0.08% max) minimizes carbide precipitation during welding and exposure to high temperatures, reducing susceptibility to intergranular corrosion and ensuring excellent weldability.

• Good Mechanical Properties: Maintains high strength and structural integrity at elevated temperatures.

• Formability and Weldability: Exhibits excellent forming and welding characteristics, facilitating fabrication into complex components.

Typical Chemical Composition (Weight %)

Mechanical Properties (Typical at Room Temperature)

Applications

309S stainless steel coil is widely used in components that require reliability under thermal stress, including:

• Furnace Parts: Heat treatment trays, baskets, radiant tubes, and muffles.

• Thermal Processing Equipment: Welding filler metal, furnace linings, combustion chambers, and oven liners.

• Power Generation & Petrochemical: Components in boilers, reformers, and refinery heaters.

• Aerospace: High-temperature engine parts and exhaust systems.

• Food Processing: Equipment like oven bands and conveyors in high-temperature food processing.

Available Specifications & Forms

• Standards: ASTM A240, ASME SA-240, and other international equivalents.

• Width: Customized as per customer requirements.

• Thickness: Available in a wide range of gauges.

• Surface Finish: Offered in various finishes including 2B, No.1, BA (Bright Annealed), and others to meet specific application needs.

• Condition: Supplied in annealed and pickled condition.