Hastelloy C22 Flanges
Hastelloy C22 Flanges ( UNS N06022 ) Manufacturer & Supplier
Hastelloy C22 Flanges are high-performance nickel-chromium-molybdenum-tungsten alloy flanges designed for maximum corrosion resistance in both oxidizing and reducing environments. Known for superior resistance to pitting, crevice corrosion, and stress corrosion cracking, Hastelloy C22 is one of the most versatile corrosion-resistant alloys available.
These flanges perform exceptionally well in chemical processing, marine engineering, pollution control, and high-temperature applications. Their outstanding metallurgical stability and excellent formability make them suitable for critical industrial systems requiring long-term reliability.
Key Features
Excellent resistance to oxidizing and reducing media.
Superior protection against pitting, crevice corrosion & stress corrosion cracking.
Outstanding resistance to chloride-induced corrosion.
High molybdenum & chromium content for excellent durability.
Highly versatile for acidic, chemical, marine & high-temperature applications.
Excellent metallurgical stability during welding and fabrication.
Suitable for high-pressure and high-temperature operational conditions.
Specification
| Specification | Details |
|---|---|
| Grade | Hastelloy C22 |
| Standard | ASTM B564 / ASME SB564 |
| UNS | N06022 |
| Werkstoff Nr. | 2.4602 |
| Flange Types | WN, SO, BLRF, SWRF, THRF, LJRF, RTJ, Reducing, Orifice |
| Size Range | ½” to 48” |
| Pressure Class | 150#, 300#, 600#, 900#, 1500#, 2500# |
| Face Type | RF / RTJ / FF |
| Production Type | Forged, Heat Treated, Machined |
| Form | Flanges, Rings, Discs, Custom Forgings |
Equivalent Grade
| Standard | Grade |
|---|---|
| UNS | N06022 |
| Werkstoff Nr. | 2.4602 |
| EN | NiCr21Mo14W |
| JIS | NW6022 |
Available Sizes
Nominal Pipe Sizes: ½” to 48”
Schedules: SCH 10 to SCH XXS
Pressure Rating: 150# to 2500#
Custom dimensions available for special applications
Chemical Composition
| Element | Content (%) |
|---|---|
| Nickel (Ni) | Balance |
| Chromium (Cr) | 20 – 22.5 |
| Molybdenum (Mo) | 12.5 – 14.5 |
| Tungsten (W) | 2.5 – 3.5 |
| Iron (Fe) | 2 – 6 |
| Cobalt (Co) | ≤ 2.5 |
| Manganese (Mn) | ≤ 0.5 |
| Carbon (C) | ≤ 0.015 |
| Silicon (Si) | ≤ 0.08 |
| Phosphorus (P) | ≤ 0.02 |
| Sulfur (S) | ≤ 0.02 |
Mechanical Properties
| Property | Value |
|---|---|
| Tensile Strength | 690 MPa (min) |
| Yield Strength (0.2%) | 310 MPa (min) |
| Elongation | 45% (min) |
| Hardness | 89 HRB (max) |
Physical Properties
| Property | Value |
|---|---|
| Density | 8.69 g/cm³ |
| Melting Point | 1355 – 1400°C |
| Thermal Conductivity | 10.1 W/m·K |
| Specific Heat | 420 J/kg·K |
| Electrical Resistivity | 1.3 µΩ·m |
Types of Hastelloy C22 Flanges
Weld Neck Flanges (WN)
Slip-On Flanges (SO)
Blind Flanges (BLRF)
Socket Weld Flanges (SWRF)
Threaded Flanges (THRF)
Lap Joint Flanges (LJRF)
Ring Type Joint Flanges (RTJ)
Long Weld Neck Flanges
Orifice & Reducing Flanges
Custom Machined Flanges
Corrosion Resistance
Hastelloy C22 offers some of the best corrosion resistance among all Ni-Cr-Mo alloys, providing:
Excellent resistance to chlorides, sulfides, and seawater environments
Superior resistance to pitting and crevice corrosion
Excellent performance in oxidizing acids (nitric, chromic)
Highly resistant to reducing acids (hydrochloric, sulfuric)
Exceptional resistance in mixed acid systems
Excellent performance in wet chlorine gas, hypochlorites & chlorine dioxide
This makes C22 ideal for systems handling aggressive chemicals.
Heat Resistance
Retains high strength up to 1100°C
Superior oxidation resistance at elevated temperatures
Excellent stability during temperature fluctuations
Suitable for flue-gas desulfurization systems, high-temperature reactors & heat exchangers
Heat Treatment
Solution Annealing: 1121°C followed by rapid quenching
Enhances corrosion resistance
Removes residual stresses
Ensures metallurgical stability
Welding
Hastelloy C22 flanges are highly weldable using:
GTAW (TIG)
GMAW (MIG)
SMAW (Stick)
Welding Features:
Excellent weldability without cracking
No need for post-weld heat treatment
Use matching filler metal ERNiCrMo-10
Weld joints maintain corrosion resistance equal to base metal
Fabrication
Excellent workability and formability
Suitable for hot and cold forming
Requires carbide tools for efficient machining
Avoid forming at temperatures between 650–870°C to prevent microstructural issues
Anneal after heavy cold forming
Applications
Chemical Processing Industry
Petrochemical & Refinery Equipment
Pollution Control Systems
Desulfurization Plants
Pharmaceutical & Food Processing
Marine Engineering & Offshore Platforms
Heat Exchangers & Pressure Vessels
Acid Pickling Systems
Nuclear Waste Treatment
Pulp & Paper Chemical Systems