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Because of its low carbon content and high alloy content, the austenitic stainless steel known as alloy ub6 (also known as 904L) is widely employed in situations in which the corrosion resistance offered by AISI 316L and AISI 317L is insufficient. Copper is added to this grade of stainless steel, which increases its resistance to corrosion in comparison to standard chrome nickel stainless steels. This improvement is particularly noticeable when the steel is exposed to sulfuric, phosphoric, and acetic acids.


On the other hand, hydrochloric acids have very specific applications throughout the world. In addition to this, it is resistant to crevice corrosion and stress corrosion cracking, as well as pitting in chloride solutions. Alloy 904L surpasses other austenitic stainless steels due to the greater amount of nickel and molybdenum alloying that it contains. The grade exhibits nonmagnetic characteristics across the board and possesses exceptional formability and welding qualities. Because of its austenitic structure, this grade maintains a high level of toughness even when subjected to cryogenic temperatures. The high chromium content of the material promotes the formation of a passive layer that coats it and shields it from the effects of corrosive environments. Other types of stainless steel that contain molybdenum, such as 316L and 317L, are more likely to precipitate ferrite and sigma phases during the welding and cooling processes. This is because molybdenum makes the steel more brittle. Because of the low concentration of carbon, there is only a small possibility of intercrystalline corrosion occurring during the cooling or welding processes. 450 degrees Celsius is the highest temperature at which it may be utilised effectively.


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