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.
Conclusion
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.
Meet Bhavesh, a seasoned blogger with a wealth of knowledge and experience. From metal products manufacturing to retail, Bhavesh has a diverse background in various industries and is dedicated to sharing his insights and expertise with readers.
