ThePipingMart Blog Grades AISI 8822H Alloy Steel (UNS H88220) – Composition, Properties, and Uses

AISI 8822H Alloy Steel (UNS H88220) – Composition, Properties, and Uses

AISI 8822H

If you’re looking for alloy steel that can handle high temperatures, resist corrosion, and withstand wear and tear, you must know about AISI 8822H. This alloy steel is made to perform under challenging conditions, making it a popular choice for engineering applications. In this blog post, we’ll explore everything you need to know about AISI 8822H, from its composition and mechanical properties to its uses and heat treatment.

What is AISI 8822H?

AISI 8822H is a high-alloy, martensitic stainless steel designed for strength and corrosion resistance in tough applications. It features low carbon, high chromium and nickel content for good formability and weldability and increased hardenability with additional chelating elements like molybdenum and vanadium. Its properties make it ideal for elevation applications such as oil platforms or aerospace components.

AISI 8822H Composition

AISI 8822H is a low-alloy steel that contains chromium, molybdenum, and nickel. It is known for its excellent high-temperature strength and resistance to corrosion and wear. The composition of AISI 8822H includes 0.18-0.23 carbon, 0.70-0.90 manganese, 0.040 maximum phosphorus, 0.035 maximum sulfur, 0.40-0.60 silicon, 0.40-0.70 chromium, 0.15-0.25 molybdenum, and 0.40-0.50 nickel. It is a cost-effective alternative to more expensive steels like stainless steel.

Element Content (%)
Iron, Fe Balance
Manganese, Mn 0.70-1.05
Nickel, Ni 0.35-0.75
Chromium, Cr 0.35-0.65
Molybdenum, Mo 0.30-0.40
Carbon, C 0.19-0.25
Silicon, Si 0.15-0.30
Sulfur, S 0.040
Phosphorus, P 0.035

AISI 8822H Mechanical Properties

AISI 8822H has high tensile strength, toughness, and good yield strength. It also exhibits excellent wear resistance and fatigue strength. The mechanical properties of AISI 8822H vary depending on its heat treatment. When quenched and tempered, it can have a tensile strength of up to 1500 MPa, with a yield strength of up to 1200 MPa and 14% elongation.

Properties Metric Imperial
Elastic modulus 190-210 GPa 27557-30458 ksi
Poisson’s ratio 0.27-0.30 0.27-0.30

AISI 8822H Physical Properties

Regarding physical properties, AISI 8822H has a density of 7.85 g/cm3 and a melting point of 1426°C. It has a thermal expansion coefficient of 12.0 µm/m-K and a thermal conductivity of 40.0 W/m-K. It also has a specific heat capacity of 470 J/kg-K.

AISI 8822H Equivalents

  • ASTM A304
  • SAE J1268
  • DIN 1.6643
  • B.S. 805 A 20

AISI 8822H Uses

AISI 8822H is used in various applications, from oil and gas to aerospace and engineering. It is popular in manufacturing turbine blades, steam turbine applications, and gears. It is also used to construct power plants, chemical plants, and pressure vessels.

AISI 8822H Corrosion Resistance

AISI 8822H is highly corrosion-resistant, making it ideal for harsh environments. Its corrosion resistance is comparable to stainless steel, making it a popular choice for applications requiring high corrosion resistance.

AISI 8822H Heat Treatment

Heat treating AISI 8822H involves heating it to a specific temperature and then quenching it in oil or water. The heat treatment process aims to enhance the hardness and tensile strength of the steel.

AISI 8822H Machining

Machining AISI 8822H can be challenging due to its toughness and hardness. However, it can be machined using standard processes like turning, milling, and drilling.

AISI 8822H Welding

Welding AISI 8822H requires preheating to prevent cracking and post-weld heat treatment from restoring mechanical properties. It is recommended to use low-hydrogen welding electrodes or wires to avoid hydrogen cracking.


AISI 8822H is an excellent low-alloy steel ideal for high-temperature applications requiring wear and corrosion resistance. Its mechanical and physical properties, as well as its excellent corrosion resistance, make it a popular choice for various applications. Understanding its composition, mechanical properties, and heat treatment is essential to get the best performance out of AISI 8822H. This durable steel ensures your equipment performs at its best, even under challenging conditions.

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