 NICKEL-CHROMIUM-MOLYBDENUM-TUNGSTEN ALLOY FLANGES MANUFACTURER & SUPPLIER.webp)
Hastelloy C22 (Alloy C22) Nickel-Chromium-Molybdenum-Tungsten Alloy Flanges Manufacturer & Supplier
Metinox Overseas is ranked among the biggest manufacturers and distributors of Hastelloy C22 (Alloy C22) nickel chromium molybdate alloy flanges that are considered the most adaptable corrosive resistant alloy on the market, with superior pitting, crevice corrosion, and stress corrosion cracking characteristics. Our ASTM B564 UNS N06022 Forged Flanges boast of high-quality nickel-based superalloy composition of nickel (balance, minimum 56%), chromium (20.0-22.5%), molybdenum (12.5-14.5%), tungsten (2.5-3.5%), and low carbon (0.015% maximum) that provides high versatile corrosion resistance with excellent weldability and excellent resistance to heat-affected zone precipitation.
They are also well suited to the harshest corrosive conditions, both cryogenic to 1900 F (1040 C) oxidizing and reducing, which are best in chemical processing (oxidizing chloride solutions, mixed acids), pollution (flue gas desulfurization systems), pulp and paper (bleaching operations), waste treatment, pharmaceutical manufacturing, offshore oil and gas (seawater service), and multipurpose service, where only a single alloy is needed, both to do it.
Table of Contents
- Hastelloy C22 Flanges Technical Specifications
- Hastelloy C22 Equivalent Grades
- Hastelloy C22 Chemical Composition
- Mechanical Properties of Hastelloy C22 Flanges
- Hastelloy C22 Flange Dimensions & Pressure Rating Chart
- Types of Hastelloy C22 Flanges Available
- Standard Flange Sizes & Weight Chart
- Is Hastelloy C22 Good Quality for Versatile Corrosion Resistance?
- Heat Treatment & Testing Requirements
- Hastelloy C22 Nickel-Chromium-Molybdenum-Tungsten Alloy Flanges Price List 2026
- Applications of Hastelloy C22 Flanges in Industry
- Why Choose Hastelloy C22 Flanges from Metinox Overseas?
- Hastelloy C22 Flange Delivery Time & CIF Pricing by Country
- Other Types of Hastelloy C22 Flanges
- People Also Search For
- Frequently Asked Questions (FAQ)
Hastelloy C22 Flanges Technical Specifications
| Feature | Details |
| Specifications | ASTM B564 / ASME SB564 / DIN 17744 |
| Grade | UNS N06022 (Hastelloy C22 / Alloy C22) |
| Material Designation | Nickel-Chromium-Molybdenum-Tungsten Alloy (Ni-Cr-Mo-W) |
| UNS Number | N06022 |
| Werkstoff Number | 2.4602 |
| Dimensional Standards | ANSI/ASME B16.5, B16.47 Series A & B, B16.48, MSS SP-44 |
| Size Range | 1/2" (15 NB) to 60" (1500 NB) |
| Pressure Class | 150#, 300#, 400#, 600#, 900#, 1500#, 2500# (B16.5) 75#, 150#, 300#, 400#, 600#, 900# (B16.47) |
| Flange Types | Weld Neck, Slip-On, Blind, Socket Weld, Lap Joint, Threaded, Orifice, Long Weld Neck, Reducing |
| Flange Face | RF, FF, RTJ, Male & Female, Tongue & Groove |
| Manufacturing Type | Hot Forged |
| Microstructure | Austenitic (FCC) Solid Solution |
| Heat Treatment | Solution Annealed at 1120-1160-C + Rapid Water Quench |
| Testing | Tensile, Hardness, Impact, PMI, Ferrite Detection, Ultrasonic |
| Inspection | TUV, SGS, Bureau Veritas, Lloyd's, DNV-GL, BV, ABS |
| Certifications | EN 10204 3.1B, NACE MR0175 / ISO 15156, PED 2014/68/EU, CE Marked, ASME B31.3 |
Hastelloy C22 Equivalent Grades
| Standard | USA | Germany | Europe | Japan | UK | China |
| Grade Name | Hastelloy C22 | |||||
| UNS | N06022 | |||||
| Werkstoff | 2.4602 | 2.4602 | NA 25 | NS3308 | ||
| ASTM | ASTM B564 N06022 | |||||
| Other Designations | Alloy C-22 | NiCr21Mo14W | NiCr21Mo14W |
Note: Equivalent proprietary names include Alloy C-22, Nickelvac C-22, Nicrofer 5621 hMo.
Hastelloy C22 Chemical Composition
| Element | Composition (%) | Function |
| Nickel (Ni) | 56.0 min (Balance) | Base element, corrosion resistance |
| Chromium (Cr) | 20.0 - 22.5 | Oxidation & acid resistance |
| Molybdenum (Mo) | 12.5 - 14.5 | Pitting & crevice corrosion resistance |
| Tungsten (W) | 2.5 - 3.5 | Improves resistance in reducing media |
| Iron (Fe) | 2.0 - 6.0 | Solid solution strengthening |
| Manganese (Mn) | 0.50 max | Improves hot workability |
| Silicon (Si) | 0.08 max | Deoxidizer |
| Carbon (C) | 0.015 max | Prevents carbide precipitation |
| Cobalt (Co) | 2.5 max | Residual control |
| Vanadium (V) | 0.35 max | Residual control |
| Phosphorus (P) | 0.02 max | Improves corrosion resistance |
| Sulfur (S) | 0.02 max | Improves hot workability |
Mechanical Properties of Hastelloy C22 Flanges
| Property | Requirement (Solution Annealed) | Standard |
| Tensile Strength | = 690 MPa (100 ksi) | ASTM E8 |
| Yield Strength (0.2%) | = 310 MPa (45 ksi) | ASTM E8 |
| Elongation | = 45% | ASTM E8 |
| Hardness (Brinell) | 170 - 230 HB | ASTM E10 |
| Hardness (Rockwell B) | 80 - 92 HRB | ASTM E18 |
| Impact Strength | Excellent Toughness | ASTM E23 |
| Density | 8.69 g/cm- | - |
Hastelloy C22 Flange Dimensions & Pressure Rating Chart
Pressure-Temperature Ratings for Hastelloy C22 Flanges (ASTM B564 N06022)
| Temperature -F (-C) | Class 150 | Class 300 | Class 600 | Class 900 | Class 1500 | Class 2500 |
| -20 to 100 (-29 to 38) | 285 psi | 740 psi | 1480 psi | 2220 psi | 3705 psi | 6170 psi |
| 200 (93) | 260 | 675 | 1350 | 2025 | 3375 | 5625 |
| 400 (204) | 218 | 565 | 1130 | 1695 | 2825 | 4710 |
| 600 (316) | 170 | 440 | 880 | 1320 | 2200 | 3665 |
| 800 (427) | 128 | 330 | 660 | 990 | 1650 | 2750 |
| 1000 (538) | 85 | 220 | 440 | 660 | 1100 | 1835 |
| 1200 (649) | 60 | 155 | 310 | 465 | 775 | 1290 |
| 1400 (760) | 43 | 111 | 223 | 334 | 557 | 928 |
Types of Hastelloy C22 Flanges Available
| Flange Type | Description |
| Weld Neck (WN) | Butt-welded connection for versatile corrosion resistance in oxidizing and reducing environments |
| Slip-On (SO) | Slides over pipe for fillet welding in multipurpose chemical processing applications |
| Blind (BL) | Solid disc for closing pipe ends in FGD systems, bleach plants, and seawater service |
| Socket Weld (SW) | Internal socket design for small bore piping in pharmaceutical and offshore applications |
| Lap Joint (LJ) | Loose flange with stub end for wet chlorine, hypochlorite, and mixed acid systems |
| Threaded (TH) | NPT/BSP threaded connection for non-welded oxidizing chloride service |
| Orifice | Flow measurement flanges for pollution control and pulp & paper bleaching operations |
| Long Weld Neck | Extended neck design for subsea equipment and high thermal stress applications |
| Reducing | Different bore sizes for transitioning pipe diameters in versatile corrosive environments |
Standard Flange Sizes & Weight Chart
Hastelloy C22 Weld Neck Flange Dimensions (ANSI B16.5) - Class 600 Sample
| NPS | OD (mm) | Thickness (mm) | Bore (mm) | Hub Dia (mm) | BC (mm) | Bolts | Bolt Dia | Weight (kg) |
| 1/2" | 95 | 16 | 21 | 41 | 66 | 4 | M16 | 0.89 |
| 1" | 124 | 21 | 33 | 57 | 89 | 4 | M19 | 1.84 |
| 2" | 165 | 25 | 60 | 84 | 127 | 8 | M19 | 4.02 |
| 4" | 273 | 32 | 114 | 146 | 216 | 8 | M25 | 13.0 |
| 6" | 356 | 38 | 168 | 210 | 270 | 12 | M25 | 27.9 |
| 8" | 419 | 41 | 219 | 270 | 330 | 12 | M28 | 44.2 |
| 10" | 508 | 48 | 273 | 330 | 403 | 16 | M32 | 76.1 |
| 12" | 559 | 52 | 324 | 381 | 476 | 20 | M32 | 103.2 |
| 16" | 711 | 64 | 419 | 495 | 603 | 20 | M38 | 195.0 |
| 20" | 838 | 70 | 508 | 603 | 724 | 24 | M38 | 301.0 |
| 24" | 991 | 78 | 610 | 705 | 838 | 24 | M45 | 447.2 |
Is Hastelloy C22 Good Quality for Versatile Corrosion Resistance?
Yes, Hastelloy C22 (Alloy C22, UNS N06022) is globally considered the most universal corrosion-resistant nickel-based alloy material that offers superior resistance against oxidizing and reducing media such as wet chlorine gas, hypochlorite solutions, chlorine dioxide, ferric and cupric chlorides, oxidizing acid combined with chloride ions, seawater, brine solutions, sulfuric acid, hydrochloric acid, nitric acid, phosphoric acid, ac Hastelloy C22, developed by Haynes International in the 1980s as a refinement of C-276, is a better-performing material in the widest variety of corrosive environments, and overcomes the limitations of C-276.
Hastelloy C22 has a fine balance of (20.0-22.5) chromium, (12.5-14.5) molybdenum and (2.5-3.5) tungsten that gives it great versatility. The high chromium level is used to guarantee high resistance to oxidizing media such as wet chlorine, hypochlorite, chlorine dioxide, nitric acid and oxidizing chloride solutions where C-276 might be insufficient. The large concentration of molybdenum to give excellent resistance to reducing acids, such as hydrochloric and sulfuric acids, and also offering excellent pitting and crevice corrosion resistance with a Pitting Resistance Equivalent Number (PREN) of up to 70-75, far superior to 316L stainless steel (PREN -24) and comparable to super duplex grades.
The tungsten addition increases localized attack resistance and reducing environment corrosion resistance. The very low level of carbon (no more than 0.015 percent) is necessary to provide high levels of overall resistance to the formation of grain boundary carbides in the weld heat-affected area and C22 can be used in the as-welded state over a wider range of applications than C-276.
A lot of testing proves the superiority of Hastelloy C22 in oxidizing chloride environment. C22 is much better than C-276 in wet chlorine gas service: corrosion rates of C22 are sometimes 10-100 times lower. C22 exhibits exceptional resistance in hypochlorite and chlorine dioxide solutions in which pulp and paper bleaching is practiced where C-276 can have a faster attack. C22 is more resistant to pitting and crevice corrosion in standard pitting tests in ferric chloride and cupric chloride solutions (Pitting Test C22).
C22 has the same or better performance compared to C-276 in the reduction of acid environments. The alloy is very resistant to hydrochloric acid at wide concentrations and temperatures, sulfuric acid over wide concentration and temperature, phosphoric acid including contaminated variety, and organic acids. The versatility enables the C22 to deal with mixed acids as well as alternate oxidizing/reducing environments that would otherwise necessitate a variety of alloy systems including C-276 or other alloys.
Hastelloy C22 exhibits excellent resistance against the seawater and chloride solutions and is best suited in offshore oil and gas, desalination plants and marine service. The alloy is totally immune to chloride stress corrosion cracking, better in crevice corrosion even in idle seawater, and very good in sour service conditions with hydrogen sulfide (H2S), and carbon dioxide (CO2).
The alloy has very high corrosion resistance at high temperatures, up to 1200 deg F (650 deg C) in most conditions. C22 exhibits good oxidation resistance than C-276 in oxidizing atmospheres. C22 has high temperature strength and oxidation resistance allowing it to be used in thermal cycling applications and in high temperature chemical processing.
Hastelloy C22 has a single major weakness, that of cost, which is commonly 20-30% higher than C-276. But in cases where such applications are necessary towards resistance to both oxidizing and reducing environments, or more specifically oxidizing chloride service, the performance benefits is worth the premium. C22 is NACE MR0175/ISO 15156 certified sour service and is commonly specified under ASME B31.3 Process Piping Code to use in corrosive situations that are critical.
Heat Treatment & Testing Requirements
Heat Treatment Requirements (Mandatory)
| Process | Step / Parameter | Requirement | Remarks |
| Solution Annealing + Rapid Quenching | Solution Annealing Temperature | 1120-1160-C (2050-2120-F) | Optimal for complete carbide dissolution |
| Holding Time | Adequate soaking | Based on section thickness, typically = 30 minutes | |
| Cooling After Annealing | Rapid water quench | Essential to retain single-phase austenitic structure | |
| Critical Cooling Rate | Fast cooling through critical range | Slow cooling leads to carbide precipitation | Critical Requirement |
| Ferrite-Free Structure | Fully austenitic (0% ferrite) | Verify using ferrite detector |
Testing & Inspection Requirements (Comprehensive)
| Test / Inspection | Standard / Requirement | Acceptance / Remarks |
| Tensile Testing | ASTM E8 | Yield = 45 ksi (310 MPa), Tensile = 100 ksi (690 MPa), Elongation = 45% |
| Hardness Testing | ASTM E10 / ASTM E18 | Typical range: 170-230 HB (80-92 HRB) |
| Charpy Impact Testing | ASTM E23 | Excellent toughness from cryogenic to elevated temperatures |
| PMI Testing | Positive Material Identification | Ni = 56%, Cr 20-22.5%, Mo 12.5-14.5%, W 2.5-3.5% |
| Ferrite Detection | Ferritescope / Magnetic Test | Mandatory ferrite-free structure (0% ferrite) |
| Ultrasonic Testing | ASTM A388 | Mandatory for offshore and chemical service |
| Pitting Corrosion Testing (Optional) | ASTM G48 Method A | Confirms PREN value and chloride resistance |
Hastelloy C22 Nickel-Chromium-Molybdenum-Tungsten Alloy Flanges Price List 2026
Prices are indicative only and may vary based on raw material cost, size, machining, heat treatment, testing scope, and delivery terms.
| Flange Type | Size Range | Pressure Class | Indicative Price Range (USD / Piece) |
| Weld Neck (WN) | 1/2" - 2" | 150# | $155 - $385 |
| Weld Neck (WN) | 4" - 8" | 150# | $645 - $2,425 |
| Weld Neck (WN) | 10" - 24" | 150# | $3,850 - $13,850 |
| Weld Neck (WN) | 1/2" - 2" | 300# | $235 - $565 |
| Weld Neck (WN) | 4" - 8" | 300# | $975 - $3,505 |
| Weld Neck (WN) | 10" - 24" | 300# | $5,555 - $19,950 |
| Weld Neck (WN) | 1/2" - 2" | 600# | $345 - $825 |
| Weld Neck (WN) | 4" - 8" | 600# | $1,525 - $5,255 |
| Slip-On (SO) | 1/2" - 2" | 150# | $132 - $315 |
| Slip-On (SO) | 4" - 8" | 150# | $535 - $1,955 |
| Blind (BL) | 1/2" - 2" | 150# | $118 - $285 |
| Blind (BL) | 4" - 8" | 150# | $555 - $2,195 |
| Socket Weld (SW) | 1/2" - 2" | 150# - 600# | $168 - $715 |
Applications of Hastelloy C22 Flanges in Industry
The use of Hastelloy C22 flanges is mostly common in industries where such qualities like high strength, resistance to oxidation, and stability at high temperatures are needed.
- Chemical Processing: Multipurpose reactors, heat exchangers for oxidizing chloride service, mixed acid environments
- Pollution Control: Flue gas desulfurization (FGD) systems, wet scrubbers, chlorine dioxide handling
- Pulp & Paper: Bleach plants, chlorine dioxide systems, hypochlorite service
- Pharmaceutical: Multipurpose equipment, oxidizing cleaning systems, versatile process vessels
- Waste Treatment: Incineration scrubbers, chemical oxidation systems
- Offshore Oil & Gas: Subsea equipment, seawater service piping, sour service applications
- Desalination: Seawater reverse osmosis, thermal desalination, brine handling
- Geothermal: Well casings, surface equipment in acidic geothermal fluids
Why Choose Hastelloy C22 Flanges from Metinox Overseas?
Metinox Overseas offers certified Hastelloy C22 (Alloy C22) nickel-chromium-molybdenum-tungsten alloyies having the ability to resist oxidizing conditions through its ability to withstand oxidation up to 2700? 1120-C as well as reducing conditions by virtue of its high resistance to reducing conditions such as ferrite detection. We have ISO 9001:2015, NACE MR0175/ ISO 15156 and PED certified manufacturing and production. All flanges are furnished with EN 10204 3.1B Mill Test Certificates with full chemical analysis (Ni =56%, Cr 20-22.5%, Mo 12.5-14.5%, W 2.5-3.5%, C 0.015% max), complete tensile properties (tensile 100 ksi, yield 45 ksi, elongation 45%), hardness check, ferrite check (0% ferrite) and PREN check ( The technical department offers expert advice on C22 and C-276 material usage, oxidizing chloride service applications, welding process (AWS A5.14 ERNiCrMo-10 filler metal), and ASME B31.3 compliance to chemical processing plants, FGD systems, pulp and paper mills and general purpose corrosion worldwide.
Hastelloy C22 Flange Delivery Time & CIF Pricing by Country
| Destination Region | Major Ports / Cities | Estimated Delivery Time | Typical CIF Terms |
| Middle East (GCC) | Dubai, Dammam, Doha | 14-18 Days | CIF Dubai / CIF Dammam |
| Europe | Rotterdam, Hamburg | 28-35 Days | CIF Rotterdam / CIF Hamburg |
| USA & Canada | Houston, New York | 35-45 Days | CIF Houston / CIF New York |
| Southeast Asia | Singapore, Port Klang | 18-25 Days | CIF Singapore / CIF Port Klang |
| Africa | Lagos, Durban | 25-35 Days | CIF Lagos / CIF Durban |
Other Types of Hastelloy C22 Flanges
ASTM B564 N06022 Flanges, UNS N06022 Weld Neck Flanges, Hastelloy C22 Blind Flanges, Alloy C22 Oxidizing Chloride Flanges, Hastelloy C22 FGD Flanges, Alloy C22 Seawater Service Flanges.
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Frequently Asked Questions (FAQ)
We are NACE MR0175/ISO 15156, PED certified, and ISO 9001: 2015. EN 10204 3.1 Mill Test Certificates are given to Hastelloy C22 flanges that can be used in a range of corrosion activities.
Annealed in 1120-1160 o C and quickly quenched with water. PMI, tensile (tested to at least 100 ksi) and hardness testing, ferrite testing, and optional ASTM G48 pitting tests are performed.
C22 is also lower in carbon (0.015% vs 0.02%), which gives them better weldability. C22 is much superior to C-276 when oxidizing chloride environment such as wet chlorine with equivalent resistance to reducing acid.
AWS A5.14 ERNiCrMo-10 filler metal without any preheat is used. The C22 is suited to versatile use in equipment where oxidizing and reducing media are involved, FGD, bleach plants and offshore seawater service.
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