Introduction to the properties and applications of various grades of stainless steel

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Steel Type, Properties, Characteristics, and Applications:
304 – Low-carbon austenitic stainless acid-resistant steel. It possesses moderate intergranular corrosion resistance along with excellent corrosion resistance; it also has 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 mainly 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 intergranular corrosion resistance 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 offers 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 suitable for use 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 intergranular corrosion resistance and excellent corrosion resistance against organic acids, alkalis, and salts. It is used to manufacture important corrosion-resistant fittings for industrial equipment in industries such as synthetic fibers, petrochemicals, textiles, fertilizers, printing and dyeing, and nuclear waste treatment.
321 – Austenitic stainless acid-resistant steel. It has high intergranular corrosion resistance and good corrosion resistance against certain organic and inorganic acids, especially in oxidative environments. It is used to manufacture acid-resistant transport pipelines, large boilers’ superheaters, reheaters, steam pipes, and heat exchangers in the petrochemical industry.
347H – Austenitic stainless heat-resistant steel. It boasts 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 has high strength and good toughness. It is used to manufacture 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 intergranular corrosion resistance, excellent resistance to chloride-induced stress corrosion, and good high-temperature oxidation resistance. It is used to manufacture furnace tubes, boiler superheaters, and heat exchanger components.
314 – Austenitic heat-resistant stainless steel. It has good high-temperature oxidation resistance and creep resistance. It is used for 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 to manufacture important pipes for industrial equipment in industries such as synthetic fibers, petrochemicals, textiles, paper manufacturing, and nuclear waste treatment