AISI 329 Stainless Steel Chemical Properties, Grade, Chart and Online Pdf

AISI 329 is a kind of duplex stainless steel that has excellent corrosion resistant feature and high-strength technical characteristic. The main chemical constituents generally include a combination of chromium, nickel, molybdenum, and nitrogen which determine the unparalleled operation in extreme environments. Extra low carbon alloy carbon steel has a mixture of austenitic and ferritic structures which is responsible for both strength and toughness. Commonly applicable in applications where resistance to stress corrosion cracking and pitting corrosion is crucial, AISI 329 plays the role of an excellent companion in industries like marine, chemical processing, and oil & gas industries. Engineers and designers will usually check comprehensive tables and PDF documents explaining the material’s mechanical property, chemical composition, as well as the suitable grades for their projects to ensure that they select the right material for the project.

AISI 329 Austenitic Stainless Steel Chemical Composition And Grade Table

AISI 329 belongs to the group of duplex steel that is characterized by extraordinary corrosion resistance and high strength. Its chemical composition usually consists of the iron, chromium, nickel, molybdenum and nitrogen as its typical elements. In its balanced composition, AISI 329, has dual phases microstructure, a combination of austenitic and ferritic phases together. This grade has excellent resistance to chloride induced stress corrosion, which enables its use in marine and chemical industries, environments where corrosion is aggressive. AISI 329 is used in other engineering sectors where durability and corrosion resistance are the main characteristics.

AISI 329 Austenitic Stainless Steel
Elements Fe Cr Ni Mo Mn Si C P S
Min (%) 63.1 23 2.0 1.0 - - - - -
Max (%) 74 28 5.0 2.0 1.0 0.75 0.080 0.040 0.030

The Advantages and Disadvantages of AISI 329 Austenitic Stainless Steel


  • Corrosion Resistance: AISI 329 stainless steel displays as much as possible corrosion resistance in different environments such as acidic and high-temperature ones.

  • High Strength: It has a good tensile strength and durability, making it a great choice to apply in structural spaces where strength is essential.

  • Formability: AISI 329 is a material that is easier to form and manufacture into different shapes enabling for diverse construction.

  • Weldability: Its low carbon content not only improves weldability, but also facilitates assembly and welding processes. Consequently, working with it would be less complicated.

  • Temperature Resistance: AISI 329 offers amazing performance at high temperatures because it is stable and reliable under extreme conditions.


  • Magnetic Properties: AISI 316 stainless steel is commonly magnetically by the mild magnetic effect what can lead to the rejection by some applications where magnetism is not required.

  • Work Hardening: It works prone to over hardening under forming operations and thus resulting in the loss of ductility that could be regained by annealing or heat treatment.

  • Cost: For instance, other for grades than AISI 329 stainless steel can cost relatively a lot, so the affordability is affected in some applications.

  • Surface Finish: Getting any given smooth surface finish can be difficult especially when the work-hardening property of this material is relocated at machining stage.

  • Sensitivity to Chloride: AISI 329 is at risk of getting localized corrosion in chloride rich, surroundings, so it is essential to take a cautious approach when choosing this alloy for marine or coastal structures.

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