AISI 321H Stainless Steel Chemical Properties, Grade, Charts and Document

AISI 321H is an austenitic stainless steel known by its memorable superb resistance to high temperatures and its great corrosion resistance. The core chemical element of a steel alloy is iron, which is the atmosphere of chromium, nickel, and titanium. Titanium offers an enhanced protection from carbides because of the stability it provides against carbide precisipation when welding and exposure to high temperatures. AISI 321H is typically employed for anti-intergranular corrosion resistant purposes and can be applied to for example creating consumer goods for chemical processing, petrochemical as well as power plants. It follows the norms for grades that are similar across the industry, making it guaranteed to be trustworthy and stable in operation. A tabular chart with an accompanying PDF resources containing a rather detailed description of all its properties and specifications is an invaluable tool for a group of engineers or manufacturers as well as for the researchers wanting to apply the material to its full capacity.

AISI 321H Austenitic Stainless Steel Chemical Composition And Grade Table

AISI 321H, which is an austenitic stainless steel, holds out very well at increased temperature against corrosion and oxidation. Its chemical composition basically comprise of iron (67-70%), chromium (17-19%), nickel (9-12%), and a trace amount of titanium (0.6%) to improve weldability by eliminating chromium carbide precipitation. The temperature strength at this particular grade is higher and superior than that of the regular 321 stainless steel, giving the material room for applications in different industry areas, such as the aerospace, chemical-processing, and thermal-processing equipment. For instance, its structure makes the alloy have good mechanical properties and resistance to intergranular corrosion which makes it the most preferred material for the demanding environments.

AISI 321H Austenitic Stainless Steel
Elements C Mn Si P S Cr Ni N Other
Min (%) 0.04 - - - - 17.0 9.0 - Ti=4(C+N)
Max (%) 0.10 2.00 0.75 0.045 0.030 19.0 12.0 - 0.70

The Advantages and Disadvantages of AISI 321H Austenitic Stainless Steel


  • Enhanced High-Temperature Performance: 321H possesses higher carbon content in comparison to 321 to enhance strength and thermal stability.

  • Excellent Corrosion Resistance: It also exhibits good resistance to various types of corrosion such as intergranular corrosion due to its titanium stabilization.

  • Good Oxidation Resistance: It has high oxidation resistance in up to 900°C (1652°F), making it appropriate for high-temperature uses.

  • Improved Creep Resistance: Higher carbon results in better creep or cracking resistance making it suitable for applications that involve high stress and high temperature.

  • Weldability: It can be welded without carbide precipitation thus retaining its resistance to corrosion in welded structures.


  • Higher Cost: They are more costly than the standard grades because of higher carbon and having been stabilized with titanium.

  • Reduced Toughness: Higher concentrations of carbon make the steels less tough, especially if they are exposed to cryogenic conditions.

  • Work Hardening: Tends to work harden, which can make the machining and forming process more difficult.

  • Limited Availability: Not as readily available as more basic grades such as 304 and 316, which could create longer delivery times and increased costs of purchase.

  • Magnetic Properties: Although it has low magnetic properties, it can slightly be magnetic when cold worked, which may not be suitable in some uses.

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Frequently Asked Questions

What are the Key chemical Compositions of AISI 321H?

Its main constituents are Chromium, Nickle, and carbon; Chromium is in the range of 17-19%, while Nickle is in the range of 9-12%, and the carbon content is merely 0. 04-0. 10%, with addition of Titanium at a minimum of 5 c% for stabilization.

What are the main mechanical characteristics of the AISI 321H?

AISI 321H is characterized by high tensile strength, excellent creep and stress rupture characteristics, and good toughness at sub-zero temperatures.

What uses are compatible for AISI 321H grade of stainless steel?

It is suitable for use in aerospace, chemical processing, and thermal oxidizers because of the increased strength and stability at high temperatures.

What is the difference between AISI 321H and AISI 304 and AISI 316 steels?

AISI 321 is a more appropriate material for more demanding application and working conditions than AISI 304 and AISI 316 because of its increased high temperature performance and improved resistances to sensitization.