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Exotic Metals. Reactors and Autoclaves, Process Vessel and Tanks, Hydrogenators, Pilot Plant Systems, Distillation Columns, Heat Exchangers and Condensers, and Large Size Pipe and Pipe Fittings.

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Alloy 904L

UNS No. N08904

Alloy 904L is a super austenitic stainless steel that is designed for moderate to high corrosion resistance in a wide range of process environments. The combination of high chromium and nickel content, coupled with additions of molybdenum and copper, assure good to excellent corrosion resistance.

Grade 904L stainless steel is a non-stabilized austenitic stainless steel with low carbon content. This high alloy stainless steel is added with 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 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.

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Corrosion Resistant

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.

Chemical Composition %

GradeCMnSiPSCrMoNiCu
Min-----194231
Max0.02210.0450.035235282
GradeMinMax
C-0.02
Mn-2
Si-1
P-0.045
S-0.035
Cr1923
Mo45
Ni2328
Co12
Exotic Metals. Reactors and Autoclaves, Process Vessel and Tanks, Hydrogenators, Pilot Plant Systems, Distillation Columns, Heat Exchangers and Condensers, and Large Size Pipe and Pipe Fittings.
Exotic Metals. Reactors and Autoclaves, Process Vessel and Tanks, Hydrogenators, Pilot Plant Systems, Distillation Columns, Heat Exchangers and Condensers, and Large Size Pipe and Pipe Fittings.

Special Metal Industries

Exotic Metals. Reactors and Autoclaves, Process Vessel and Tanks, Hydrogenators, Pilot Plant Systems, Distillation Columns, Heat Exchangers and Condensers, and Large Size Pipe and Pipe Fittings.
Exotic Metals. Reactors and Autoclaves, Process Vessel and Tanks, Hydrogenators, Pilot Plant Systems, Distillation Columns, Heat Exchangers and Condensers, and Large Size Pipe and Pipe Fittings.

Special Metal Industries

Exotic Metals. Reactors and Autoclaves, Process Vessel and Tanks, Hydrogenators, Pilot Plant Systems, Distillation Columns, Heat Exchangers and Condensers, and Large Size Pipe and Pipe Fittings.
Exotic Metals. Reactors and Autoclaves, Process Vessel and Tanks, Hydrogenators, Pilot Plant Systems, Distillation Columns, Heat Exchangers and Condensers, and Large Size Pipe and Pipe Fittings.

Special Metal Industries