A representative austenitic stainless steel with excellent balance of workability, weldability, and corrosion resistance, with a wide operating temperature range from -196℃ cryogenic to approximately 870℃ high temperature. However, prolonged exposure in the 550~850℃ range may cause carbide precipitation, so in such cases, the use of low-carbon steel or titanium/niobium stabilized grades is recommended. It is also strong against cryogenic embrittlement and suitable for low-temperature equipment such as LNG storage tanks.

A grade with reduced carbon content from 304 grade to address intergranular corrosion (IGC) that occurs during exposure in the 550~850℃ range or during welding.

A low-carbon austenitic grade with higher nickel content and added molybdenum compared to 304, with PRE 5~7 higher, providing excellent resistance to localized corrosion in chloride environments. It is strong against intergranular corrosion in the 550~850℃ range and maintains stable toughness even in cryogenic environments.

Marine and chemical equipment, storage tanks, piping, food and sanitary lines, cryogenic vessels, etc.

A stabilized grade with titanium added to the 316 series, which suppresses carbide precipitation in the 550~850℃ sensitization range to maintain excellent intergranular corrosion resistance. Since it is not a low-carbon grade, it also has excellent creep aging characteristics and can be a superior alternative to 316L under high-temperature and high-pressure conditions at 450~800℃. However, for environments above 800℃, the use of high-chromium and high-nickel alloys is recommended.

High-temperature heat exchangers, heater coils, exhaust gas headers, high-temperature pressure piping, etc.

A low-carbon austenitic grade with higher molybdenum content than 316L, providing excellent resistance to pitting and crevice corrosion, and stable corrosion resistance even in harsh chloride environments. It has excellent structural reliability against intergranular corrosion in the 550~850℃ range and high-temperature and high-pressure loads, making it suitable for high-corrosion and high-purity equipment.

Chemical and pharmaceutical equipment, pulp and paper industry, high-salt piping, heat exchangers, etc.

321 is an austenitic stainless steel with titanium added, providing stable corrosion resistance and structural performance in high-temperature environments below 800℃. Titanium suppresses carbide precipitation, providing excellent intergranular corrosion resistance even in the 550~850℃ sensitization range, and also has excellent creep strength and oxidation resistance, making it suitable for repeated thermal cycles. However, it has limited characteristics in cryogenic environments, so grade selection according to conditions is necessary.

High-temperature piping, aircraft exhaust systems, heat exchangers, heaters, high-temperature equipment, etc.

347 is an austenitic stainless steel with niobium (Nb) added, providing excellent intergranular corrosion resistance by suppressing carbide precipitation in the 550~850℃ sensitization range. It has excellent strength and creep properties at high temperatures and is stable even in environments with repeated thermal cycles.

High-temperature piping, heat exchangers, aircraft engine components, chemical plants, boiler tubes, etc.

310S is a high-alloy austenitic stainless steel containing Cr (24%) and Ni (19%), exhibiting excellent oxidation and scaling resistance even at temperatures above 1,100℃. With low-carbon design compared to 310, weldability and intergranular corrosion resistance are improved, and it also has excellent high-temperature creep strength, making it suitable for long-term high-heat load environments. While not suitable for cryogenic temperatures, it is stable in high-temperature equipment in oxidizing atmospheres.

High-temperature furnaces, heat treatment equipment, combustion furnaces, high-temperature heat exchangers, petrochemical plant piping, etc.

904L is a high-alloy austenitic stainless steel with high content of Ni, Mo, Cr and a small amount of Cu, providing excellent corrosion resistance and localized corrosion resistance in acidic environments such as sulfuric acid and phosphoric acid, as well as chloride environments. With low-carbon design, the risk of intergranular corrosion after welding is low, and it has excellent ductility, workability, and structural stability, with outstanding surface finish quality, making it suitable for sanitary and high-purity equipment.

Sulfuric acid and phosphoric acid equipment, marine structures, precision chemical and pharmaceutical plants, pulp and paper, high-corrosion-resistant tanks and piping systems, etc.

S31254 is a super austenitic stainless steel containing 6% Mo and high content of Cr, Ni, and N, with excellent localized corrosion and SSC resistance of PRE ≥ 42, suitable for seawater, hydrochloric acid, and oxidizing environments. It has excellent mechanical stability even at high temperatures and pressures, and satisfies both high strength and high corrosion resistance along with excellent ductility and workability, providing high design flexibility.

Marine structures, seawater heat exchangers, desalination equipment, pulp and paper processes, chemical and petrochemical plants, high-salt piping systems, etc.