In the realm of high-performance stainless steel materials, JIS G4305 SUS309S stands as a premier choice for applications requiring exceptional resistance to high temperatures and acids. Developed under the rigorous standards of the Japanese Industrial Standards (JIS), SUS309S cold-rolled stainless steel plate offers a unique blend of chemical composition, mechanical properties, and versatile processing capabilities. This article delves into the specifics of SUS309S, highlighting its composition, mechanical characteristics, heat treatment states, dimensional capabilities, low-temperature impact resistance, primary applications, and notable supply cases by TJC Steel Group.

Chemical Composition

SUS309S, also known as UNS S30900/S30908, boasts a well-balanced chemical makeup that contributes to its superior performance. Its primary elements include chromium (Cr), nickel (Ni), and silicon (Si), with strict limits on impurities such as carbon (C), manganese (Mn), phosphorus (P), and sulfur (S). This precise formulation ensures exceptional corrosion resistance and high-temperature strength. The typical chemical composition ranges are as follows:

· Carbon (C): ≤ 0.08%

· Silicon (Si): ≤ 1.00%

· Manganese (Mn): ≤ 2.00%

· Phosphorus (P): ≤ 0.045%

· Sulfur (S): ≤ 0.030%

· Chromium (Cr): 22.00% - 24.00%

· Nickel (Ni): 12.00% - 15.00%

Mechanical Properties

SUS309S cold-rolled stainless steel plate exhibits exceptional mechanical properties, particularly notable for its high tensile strength and yield strength, coupled with good ductility. These properties are further enhanced through appropriate heat treatment processes, ensuring optimal performance in demanding applications. The typical mechanical properties include:

· Tensile Strength (σb): ≥ 520 MPa

· Yield Strength (σ0.2): ≥ 205 MPa

· Elongation (% in 50mm): ≥ 40%

Heat Treatment States

SUS309S stainless steel is commonly supplied in the solution annealed condition, ensuring uniform microstructure and optimal corrosion resistance. Solution annealing involves heating the material to a temperature above the critical point, holding it for a sufficient time to allow for complete dissolution of precipitates, and then rapidly cooling to prevent re-precipitation. This process results in a fully austenitic microstructure, maximizing its resistance to sensitization and intergranular corrosion.

Producible Size Range

TJC Steel Group offers SUS309S cold-rolled stainless steel plates in a wide range of sizes to cater to diverse customer requirements. The thickness can vary from a few millimeters to several centimeters, while the width and length can be customized to fit specific applications. The company's advanced manufacturing capabilities ensure precise dimensional control and consistent quality across all product sizes.

Low-Temperature Impact Resistance

SUS309S stainless steel demonstrates good low-temperature toughness, making it suitable for applications where materials must withstand significant temperature fluctuations. Its ductility and impact resistance remain relatively high even at cryogenic temperatures, ensuring reliable performance in cold environments.

Primary Applications

SUS309S cold-rolled stainless steel plates find extensive applications in industries where high-temperature resistance, corrosion resistance, and strength are paramount. Some of the primary application areas include:

· Petrochemical and chemical processing equipment

· Furnace parts and heat exchangers

· High-temperature piping and tubing

· Automotive exhaust systems

· Power generation and nuclear industry components

· Food processing and brewing equipment

TJC Steel Group Supply Cases

TJC Steel Group, a leading supplier of stainless steel products, has successfully delivered numerous SUS309S cold-rolled stainless steel plate projects worldwide. A notable supply case involves the provision of custom-sized SUS309S plates for a large-scale petrochemical plant. The plates were precisely manufactured to meet the plant's stringent specifications, including tight dimensional tolerances and enhanced corrosion resistance. The successful completion of this project underscores TJC Steel Group's commitment to quality, reliability, and customer satisfaction.

In conclusion, JIS G4305 SUS309S cold-rolled stainless steel plate is a versatile material with exceptional high-temperature and corrosion resistance properties. Its precise chemical composition, outstanding mechanical properties, and versatile processing capabilities make it ideal for a wide range of demanding applications.