Hastelloy® C-22 (UNS N06022) Nickel-Chromium-Molybdenum-Tungsten Superalloy Plate

Hastelloy C22 Alloy Plate Performance Characteristics and Applications

1. Performance Characteristics

1.1 Excellent Corrosion Resistance
Hastelloy C22 is a nickel-based alloy primarily composed of nickel (approximately 56%), chromium (approximately 22%), molybdenum (approximately 12%), and trace amounts of tungsten and iron. This unique chemical composition provides excellent stability in strong acids, strong oxidizing media (such as ferric chloride, chlorine, and hot, contaminated solutions), and reducing environments. For example, in corrosive media such as sulfuric acid, hydrochloric acid, and seawater, its resistance to pitting and stress corrosion cracking significantly outperforms conventional stainless steel.

1.2 High-Temperature Oxidation Resistance
This alloy maintains structural stability at high temperatures (up to approximately 1000°C) and exhibits excellent oxidation resistance. Its melting point is approximately 1325–1370°C and its low coefficient of thermal expansion makes it suitable for long-term use in high-temperature environments.

1.3 Excellent Mechanical Properties and Processability
At room temperature, Hastelloy C22 has a tensile strength of approximately 690 MPa, a yield strength of approximately 283 MPa, and an elongation of up to 40%. Its Brinell hardness (HB) is ≤100, combining high strength with good ductility. Furthermore, the alloy is easily formed through conventional processes such as cold rolling, hot rolling, and stamping. It also exhibits excellent weldability, suitable for TIG and MIG welding, with welded joint properties similar to those of the parent material.

2. Main Applications

2.1 Chemical and Petroleum Industries
As a key material in reactors, heat exchangers, storage tanks, and piping systems, Hastelloy C22 resists corrosion from strong acids, chlorides, and organic solvents, ensuring safe operation of equipment in harsh environments. For example, in sulfuric and hydrochloric acid production plants, its corrosion resistance significantly extends equipment life.

2.2 Energy and Environmental Protection
This alloy is widely used in power equipment (such as nuclear power plant components) and environmental protection projects (such as wastewater treatment systems), particularly in high-temperature, high-pressure water or acidic media. Its resistance to stress corrosion cracking makes it an ideal choice for marine engineering applications (such as desalination plants).

2.3 Aerospace and Medical
Hastelloy C22’s high-temperature stability and biocompatibility are fully utilized in aerospace engine components and medical devices. For example, it is used to manufacture high-temperature-resistant medical implants or spacecraft structures.

Summary
Hastelloy C22, thanks to its comprehensive corrosion resistance, high-temperature stability, and processing flexibility, has become a core material in the chemical, energy, and aerospace industries. Its application not only improves equipment reliability, but also reduces maintenance costs, driving technological advancements in industry.^^1^^