Hastelloy C22 is a nickel-chromium-molybdenum-tungsten alloy with exceptional corrosion resistance, especially in chloride environments. The alloy is suitable for harsh environments and has a substantial presence in the chemical and petrochemical industries. Hastelloy C22 fasteners are some of the most popular fastener types in the industry because of their durability, reliability, and excellent corrosion resistance.This blog post will delve deeper into the composition, mechanical and physical properties, uses, heat treatment, and corrosion resistance capabilities of Hastelloy C22 fasteners.
Hastelloy C22 Fasteners Composition
Hastelloy C22 Bolts are composed of nickel (56%), molybdenum (22%), chromium (16%), tungsten (3.5%), iron (2.5%), cobalt (2%), and other trace elements. The unique blend of these elements contributes to exceptional resistance to pitting, crevice corrosion, chloride-induced stress corrosion cracking, and other forms of severe corrosion.
| Grade | C | Mn | Si | S | Co | Ni | Cr | Fe | Mo | P |
| Hastelloy C22 | 0.010 max | 0.50 max | 0.08 max | 0.02 max | 2.50 max | 50.015 min* | 20.00 – 22.50 | 2.00 – 6.00 | 12.50 – 14.50 | 0.02 max |
Hastelloy C22 Fasteners Physical Properties
Hastelloy C22 Nuts have impressive physical properties such as a density of 8.69 g/cm3, a melting point of 1399℃-1415℃, and a thermal conductivity of 7.9 W/m·K at room temperature. The alloy also has a low coefficient of thermal expansion of 13.9 µm/m·K, making it suitable for high-temperature applications.
Hastelloy C22 Fasteners Mechanical Properties
Hastelloy C22 Screws have excellent mechanical properties due to the alloy’s high nickel content. The fasteners have a tensile strength of 690 MPa, a yield strength of 365 MPa, and a hardness range of 89 HRB to 99 HRB. Hastelloy C22 fasteners are known for their durability and toughness in high-stress applications.
| Element | Density | Melting Point | Tensile Strength | Yield Strength (0.2%Offset) | Elongation |
| Hastelloy C22 | 8.69 g/cm3 | 1399 °C (2550 °F) | Psi – 1,00,000 , MPa – 690 | Psi – 45000 , MPa – 310 | 45 % |
Hastelloy C22 Fasteners Equivalent
| STANDARD | WERKSTOFF NR. | UNS | JIS | GOST | EN | OR |
| Hastelloy C22 | 2.4602 | N06022 | NW 6022 | – | NiCr21Mo14W | – |
Hastelloy C22 Fasteners Uses
Hastelloy C22 Washers find applications in various industries, including chemical and petrochemical industries, power generation, pharmaceuticals, food processing, waste treatment, and environmental protection. The fasteners are mainly used in critical applications that require exceptional corrosion resistance, reliability, and durability.
Hastelloy C22 Fasteners Heat Treatment
ALLOY DIN 2.4602 Bolts require proper heat treatment to achieve optimal mechanical properties. The alloy can be annealed at a temperature range of 1175℃-1225℃ and quenched in water or air. UNS N06022 Screws are also easily welded using TIG, MIG, and SAW techniques.
Hastelloy C22 Fasteners Corrosion Resistance
UNS N06022 Nuts exhibit remarkable corrosion resistance in harsh environments, including wet chlorine gas, sulfuric acid, hydrochloric acid, and phosphoric acid. The alloy’s corrosion resistance properties make it suitable for applications requiring resistance to aggressive chemicals in high-temperature environments.
Conclusion:
ALLOY DIN 2.4602 Bolts offer exceptional corrosion resistance, durability, and reliability, making them ideal for use in challenging environments. The fasteners’ unique composition, mechanical and physical properties, application versatility, heat treatment options, and corrosion resistance capabilities make them invaluable in various industrial applications. If you’re looking for a fastener that provides long-term performance in harsh environments, Hastelloy C22 fasteners are an excellent option.
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