309 stainless steel plate, GB 06Cr23Ni13, is a high-chromium-nickel austenitic heat-resistant plate, with 23% chromium and 13% nickel. Its main features are high temperature resistance, oxidation resistance, and resistance to high-temperature sulfide flue gas corrosion. It is a special plate for medium- and high-temperature furnace bodies, heat treatment equipment, and incineration equipment.

It is available in cold-rolled thin plates and hot-rolled medium-thick plates, with standard surface finishes of 2B and pickled/oxidized surfaces. It can be leveled, laser-cut, bent, and welded. Original factory materials are used, and each batch comes with a material certificate and high-temperature performance test report.

Chemical materials compare information(%)：

309 has a carbon content of ≤0.08%, offering higher mechanical strength at both room and high temperatures, and a lower price.

Disadvantages: Large-area continuous high-temperature welding can easily lead to intergranular corrosion in the weld seam; not recommended for long-term high-temperature flue gas erosion conditions.

Applications: Suitable for a small number of spot-welded structural components, short-term high-temperature tooling, and drying high-temperature supports.

Core Product Advantages:

High Temperature Resistance and Oxidation Resistance: Long-term continuous operating temperature up to 900℃, short-term extreme temperature resistance up to 1050℃. A dense oxide protective layer forms on the high-temperature surface, preventing peeling, flaking, and burn-through. Its heat resistance far exceeds that of 304 and 316L.

Resistant to Sulfur-Containing High-Temperature Flue Gas Corrosion: Exhibits outstanding resistance to sulfide corrosion from incineration exhaust gases and sulfur-containing hot gases from metallurgical kilns, reducing the likelihood of pitting, rust, and perforation.

High-Temperature Creep Resistance and Deformation Resistance: Slow strength decay under high-temperature environments; furnace linings and high-temperature load-bearing plates are less prone to softening and sagging after long-term use.

Strong stability under thermal cycling; resistant to cracking under repeated heating and cooling, suitable for intermittent annealing furnaces and quenching equipment.

Superior corrosion resistance at room temperature compared to 304 stainless steel; suitable for short-term use in dry and humid indoor environments and mildly acidic environments, offering both heat resistance and basic rust prevention.

Applicable Industries:

Heat treatment equipment: Annealing furnace linings, quenching furnace linings, high-temperature material trays, furnace door insulation panels;

Environmental incineration: Linings for small and medium-sized incinerators, heat insulation plates for waste heat equipment, high-temperature flue linings;

Metallurgical and ceramic kilns: Sintering furnace lining plates, high-temperature gas pipeline outer lining plates;

Thermal boilers: Hot air duct covers, auxiliary heat-resistant components for heating furnaces;

Petrochemical high-temperature equipment: Short-term high-temperature heating fixtures, heat insulation and protective plates.