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UNS NO8904, often known as 904L, is a low carbon, high alloy austenitic stainless steel that is commonly used in applications where the corrosion characteristics of AISI 316L and AISI 317L are insufficient. The inclusion of copper to this grade improves its corrosion resistance, particularly against sulphuric, phosphoric, and acetic acids, over traditional chrome nickel stainless steels.


Hydrochloric acids, on the other hand, have a restricted usage. It's also resistant to pitting in chloride solutions, as well as crevice and stress corrosion cracking. Because of the increased nickel and molybdenum alloying, alloy 904L outperforms other austenitic stainless steels. In all situations, the grade is nonmagnetic and has outstanding formability and welding properties. This grade has excellent toughness, even at cryogenic temperatures, thanks to its austenitic structure.The material's high chromium content encourages and maintains a passive layer that protects it from corrosive conditions.

Other stainless steels containing molybdenum, such as 316L and 317L, are more susceptible to the precipitation of ferrite and sigma phases during cooling and welding. Because of the minimal carbon concentration, there is little chance of intercrystalline corrosion during cooling or welding. The greatest temperature at which it can be used is 450°C.


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