Detailed explanation of stainless steel grades, properties, and applications

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Steel Type, Properties, Characteristics, and Applications:
304 – Low-carbon austenitic stainless acid-resistant steel. It has moderate resistance to intergranular corrosion along with excellent corrosion resistance; it also offers some resistance to alkaline solutions as well as most organic and inorganic acids. It is widely used in acid transport pipelines and chemical processing equipment.
304H – Austenitic stainless heat-resistant steel. It features good corrosion resistance and weldability, as well as decent high-temperature strength. It is primarily used in large boilers’ superheaters, reheaters, steam pipes, and heat exchangers in the petrochemical industry.
304L – Ultra-low-carbon austenitic stainless acid-resistant steel. It has good resistance to intergranular corrosion and performs well in various highly corrosive environments. It is suitable for use in corrosion-resistant components in the petrochemical industry, especially for welded fittings that cannot be heat-treated after welding.
316 – Austenitic stainless heat-resistant steel. It exhibits excellent corrosion resistance and pitting resistance against a variety of inorganic acids, organic acids, alkalis, and salts, along with good creep strength at high temperatures. It is used in large boilers’ superheaters, reheaters, steam pipes, and heat exchanger components in the petrochemical industry; it can also be used as a material resistant to pitting.
316L – Ultra-low-carbon austenitic stainless acid-resistant steel. It has good resistance to intergranular corrosion and performs well in the presence of organic acids, alkalis, and salts. It is suitable for manufacturing important corrosion-resistant fittings for industrial equipment used in the production of synthetic fibers, the petrochemical industry, textiles, fertilizers, printing and dyeing, and nuclear waste treatment.
321 – Austenitic stainless acid-resistant steel. It has high resistance to intergranular corrosion and good corrosion resistance against certain organic and inorganic acids, especially in oxidizing environments. It is used in the manufacture of acid-resistant transport pipelines, large boilers’ superheaters, reheaters, steam pipes, and heat exchangers in the petrochemical industry.
347H – Austenitic stainless heat-resistant steel. It possesses good corrosion resistance, weldability, and high-temperature strength. It is used in large boilers’ superheaters, reheaters, steam pipes, and heat exchanger components in the petrochemical industry.
2205 – Ultra-low-carbon duplex stainless acid-resistant steel. It has high resistance to pitting, crevice corrosion, stress corrosion, and uniform corrosion. It also boasts high strength and good toughness. It is used in the manufacture of various industrial heat exchangers and pipes, especially in environments containing chlorides and H2S, as well as in solutions of organic acids like acetic acid.
904L – High-nickel-molybdenum austenitic stainless acid-resistant steel. It has excellent corrosion resistance, good pitting and crevice corrosion resistance, as well as decent stress corrosion resistance. It is suitable for use in environments with organic acids in the petrochemical industry, as well as in media such as sulfuric acid and phosphoric acid in the inorganic chemical industry.
310S – Austenitic heat-resistant stainless steel. It has good resistance to intergranular corrosion, excellent resistance to chloride-induced stress corrosion, and good resistance to high-temperature oxidation. It is used in the manufacture of furnace tubes, boiler superheaters, and heat exchanger components.
314 – Austenitic heat-resistant stainless steel. It has good resistance to high-temperature oxidation and creep. It is used in furnace tubes.
317L – Austenitic stainless acid-resistant steel. It has excellent corrosion resistance, with even better pitting resistance in solutions containing chlorides. It is used in the manufacture of key piping components for industrial equipment in the production of synthetic fibers, the petrochemical industry, textiles, papermaking, and nuclear waste treatment