Stainless Steel 904L Seamless Pipe

Along with the improved chemical composition, the 904l grade also has good mechanical components. It possesses a minimum tensile strength of 490 MPa and basic yield strength of 220 MPa. Additionally, it also has a Rockwell B hardness score of 70 to 90. Due to which the metal has longer durability and better usage in various environmental conditions. The alloy is good at handling sulfuric and phosphoric acids but can fall for stress corrosion cracking in extremely high temperatures.

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Just like other grades this alloy is also fabricated in various thicknesses, sizes, shapes, lengths, and forms. It can also be made to order as per client’s needs.This chromium and nickel alloy has wide industrial applications ranging from the pulp and paper industry, construction, hardware, chemical equipment, pharmaceutical equipment, food processing, heat exchanger, power generation, sea water equipment, condensers, and many more.

Alloy 904 (N08904) stainless steel is a high alloy austenitic product intended for use under severely corrosive conditions. It offers good resistance to:

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• Pitting and crevice corrosion
• Intergranular corrosion
• Stress corrosion cracking
• General corrosion

Grade 904L stainless steel is a non-stabilized austenitic stainless steel with low carbon content. This high alloy stainless steel has added copper to improve its resistance to strong reducing acids, such as sulphuric acid. The steel is also resistant to stress corrosion cracking and crevice corrosion. Grade 904L stainless steel is non-magnetic, and offers excellent formability, toughness and weldability. Grade 904L contains high amounts of expensive ingredients, such as molybdenum and nickel. Today, most of the applications that employ grade 904L are replaced by low-cost duplex stainless steel 2205.

Grade 904L stainless steels have excellent resistance to warm seawater and chloride attack. The high resistance of grade 904L against stress corrosion cracking is due to the presence of high amounts of nickel in its composition. Moreover, the addition of copper to these grades develops resistance to sulphuric acid and other reducing agents in both aggressive and mild conditions.

The corrosion resistance of grade 904L is intermediate between super austenitic grades, with 6% molybdenum content, and standard 316L austenitic grades. Grade 904L is less resistant to nitric acid than grades 304L and 310L, which are free of molybdenum. This steel grade needs to be solution treated following cold working, to achieve maximum stress corrosion cracking resistance under critical environments.

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