HASTELLOY C22 FASTENERS — DATASHEET, CHEMICAL COMPOSITION, MECHANICAL PROPERTIES & SUPPLY
Ananka Fasteners is a premier manufacturer and global exporter of Hastelloy C22 Fasteners (UNS N06022 / W.Nr. 2.4602), a highly alloyed nickel-chromium-molybdenum-tungsten solid-solution superalloy. Engineered for extreme operational envelopes across the chemical processing, petrochemical, pollution control, pharmaceutical, and marine engineering industries, Hastelloy C22 acts as the ultimate safeguard against joint failure, offering a quantum improvement over standard austenitic stainless steels and older generation Ni-Cr-Mo alloys.
The defining breakthrough of UNS N06022 is its elevated chromium concentration (up to 22.5%) combined with ultra-low carbon (0.015% max) and silicon (0.08% max). This unique elemental balance provides dual-action resistance—instantaneously forming an impervious protective surface film in strongly oxidizing media (like nitric acid and wet chlorine) while maintaining profound thermodynamic stability that prevents the formation of grain-boundary precipitates in the weld heat-affected zone (HAZ).
Every Hastelloy C22 fastener manufactured by Ananka is produced in-house using CNC machining, hot forging, and precision thread rolling. All supplies are backed by EN 10204 Type 3.1 Material Test Certificates, 100% traceability from melt source to finished product, and mandatory Positive Material Identification (PMI) via handheld XRF. We export globally, with highly controlled fabrication protocols ensuring precision tolerances to ISO, DIN, and ASME specifications.
■ Download the Full Hastelloy C22 Technical Datasheet
Our comprehensive Hastelloy C22 fastener datasheet includes full iso-corrosion charts for various acids, complete mechanical properties, precise dimensional tolerances across DIN and ASME specifications, and custom machining guidelines.
Hastelloy C22 / UNS N06022 / 2.4602 — Complete Technical Datasheet (PDF)
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■ Material Test Certificates (EN 10204 Type 3.1)
Every lot of Hastelloy C22 fasteners shipped by Ananka is accompanied by a highly detailed EN 10204 Type 3.1 Material Test Certificate (MTC), ensuring absolute metallurgical pedigree traceable back to the originating vacuum-melted ingot.
Each MTC documents:
- Actual chemical analysis (spectro) with heat number traceability
- Complete mechanical test results: tensile, yield, elongation, hardness
- PMI (Positive Material Identification) verification via handheld XRF
- Dimensional inspection data per applicable DIN/ISO/ASME standard
- Heat treatment verification (solution annealing parameters)
■ Hastelloy C22 Material Specifications
| Material Type | Nickel-Chromium-Molybdenum-Tungsten Solid-Solution Superalloy |
|---|---|
| UNS Number | N06022 |
| Werkstoff Number | 2.4602 |
| EN Chemical Designation | NiCr21Mo14W |
| Density | 8.61 - 8.69 g/cm³ (0.311 - 0.314 lb/in³) |
| Melting Range | 1351 – 1399 °C (2464 – 2550 °F) |
| Modulus of Elasticity | 203 - 209 GPa (29.4 × 10³ - 30.3 × 10³ ksi) at 20 °C |
| Magnetic Permeability | < 1.001 (Non-magnetic) |
| Size Range | Metric: M1.2 to M160 | Imperial: #6 to 4" Custom machined lengths up to 1500 mm available. |
| Thread Types | UNC, UNF, UNEF, 8-UN, Metric Coarse, Metric Fine |
■ Chemical Composition of Alloy C22 (per ASTM B574 / F468)
The superlative performance of Hastelloy C22 fasteners is strictly dictated by precisely controlled elemental alloying. The elevated Chromium fraction drives resistance to oxidizing media, while heavy refractory metals (Molybdenum and Tungsten) provide profound resistance to reducing environments and localized passive film breakdown.
| Ni | Cr | Mo | Fe | W | Co | Mn | V | Si | C | P | S |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Bal. (~56%) |
20.0 – 22.5 | 12.5 – 14.5 | 2.0 – 6.0 | 2.5 – 3.5 | 2.50 Max | 0.50 Max | 0.35 Max | 0.08 Max | 0.015 Max | 0.02 Max | 0.02 Max |
■ Mechanical Properties at Ambient Temperature
Values for fasteners supplied in the standard solution-annealed condition (per ASTM F468 / B574). The material exhibits exceptional ductility, characterized by high elongation values, which is highly advantageous for preventing catastrophic brittle fracture under sudden impact or localized yielding.
| Property | Minimum Requirement | Typical Range |
|---|---|---|
| Ultimate Tensile Strength (UTS) | 690 MPa (100 ksi) | 772 – 841 MPa (112 – 122 ksi) |
| Yield Strength (0.2% Offset) | 310 MPa (45 ksi) | 365 – 434 MPa (53 – 63 ksi) |
| Elongation (in 50.8mm) | 45% | 54% – 62% |
| Hardness (Rockwell) | - | 85 – 95 HRB |
High-Strength Cold-Worked Grade (HS)
In extreme pressure containment applications—such as subsea wellheads or deep-hole drilling—annealed C22 may be structurally insufficient. By subjecting the raw bar stock to severe cold working (43-47% reduction) prior to machining, the dislocation density multiplies, radically transforming the mechanical profile.
| Condition | UTS | Yield (0.2%) | Elongation (%) | Hardness |
|---|---|---|---|---|
| Cold-Worked (43-47% Reduction) | 1403 MPa (203.5 ksi) | 1365 MPa (198.0 ksi) | 16.7% | 42 HRC |
Note: The deployment of highly cold-worked fasteners in sour gas (H2S) environments must be carefully vetted against NACE MR0175 guidelines due to increased susceptibility to hydrogen embrittlement.
■ International Equivalent Grades
| Standard / Region | Designation |
|---|---|
| UNS (Universal) | N06022 |
| Werkstoff / DIN | 2.4602 |
| EN Designation | NiCr21Mo14W |
| Common Trade Name | Alloy C22, Hastelloy C-22 |
■ Key Characteristics & Industrial Applications
Hastelloy C22 provides exceptional, broad-spectrum protection against both oxidizing and non-oxidizing aqueous chemicals. It is virtually immune to chloride-induced stress corrosion cracking (SCC) due to its massive ~56% nickel base, and exhibits zero localized pitting in aggressive tests like the "Yellow Death" solution up to 150°C.
- Flue Gas Desulfurization (FGD): Fasteners for scrubber liners, ducting, and spray headers handling hot, acidic slurries rich in localized chlorides and sulfuric acid.
- Chemical & Petrochemical Processing: Bolting for reactors and heat exchangers exposed to alternating process streams, including acetic anhydride, municipal chlorination, and steel pickling acid mixtures.
- Pulp & Paper Bleaching: Digester and bleach washer hardware handling highly corrosive wet chlorine and concentrated chlorine dioxide where legacy stainless alloys fail rapidly.
- Offshore & Subsea Engineering: Securing subsea infrastructure, wellheads, and desalination plant piping due to absolute immunity to seawater crevice corrosion.
- Pharmaceutical & Advanced Bioprocessing: Clean-in-place (CIP) centrifuges and high-purity mixing vessels where avoiding microscopic corrosion byproducts is essential.
■ Complete Range of Hastelloy C22 Fasteners
As a master manufacturer, Ananka produces a comprehensive range of Alloy C22 hardware, from heavy structural hex bolts to specialized blind rivets and tensioning nuts.
| Bolts & Screws | Nuts & Washers | Studs & Rods |
|---|---|---|
| Hex Bolts / Heavy Hex Bolts | Standard Hex Nuts / Heavy Hex Nuts | Fully Threaded Studs (DIN 976) |
| Socket Head Cap Screws | Nyloc / Prevailing Torque Locknuts | Double Ended Studs |
| 12-Point Bolts / Flange Bolts | Flat Washers / Split Lock Washers | Threaded Rods / Tie Rods |
| U-Bolts / Eye Bolts / T-Bolts | Sealing Washers / Star Washers | Custom CNC Machined Anchor Rods |
■ Dedicated Product Pages
- Hastelloy C22 Bolts: Heavy hex, socket head, and structural configurations.
- Hastelloy C22 Nuts: Standard hex, heavy hex, and locknuts per ASTM F467.
- Hastelloy C22 Stud Bolts: Precision-machined studs per ASME B18.2.1.
■ Applicable Standards & Specifications
| Finished Fasteners — Bolts & Studs | ASTM F468 (Nonferrous Bolts, Cap Screws & Studs) |
|---|---|
| Finished Fasteners — Nuts | ASTM F467 (Nonferrous Nuts) |
| Raw Material — Rod & Bar | ASTM B574 |
| Metric Dimensional Standards | DIN 931 / 933, ISO 4014 / 4017 (Note WAF differences on M10, M12, M14, M22) |
| Imperial Dimensional Standards | ASME B18.2.1 (Bolts/Studs), ASME B18.2.2 (Nuts) |
| Thread Profiles & Tolerances | ASME B1.1 (Class 2A/2B), UNC, UNF, 8-UN Series |
| Material Certification | EN 10204 Type 3.1 |
■ Engineering Torque Table (UNC Threads)
The Torque Coefficient (K-factor) is critical. Dry assembly of C22 is highly discouraged due to the extreme risk of catastrophic thread galling (cold-welding). A heavy-duty anti-seize compound is functionally mandatory, stabilizing the K-factor near 0.12 and dramatically reducing required torque.
Calculations assume a minimum yield strength of 45.0 ksi and target preload at 75% of proof load. Formula: T = (K · D · P) / 12
| Nominal Diameter | Threads/Inch (UNC) | Clamp Load (lbf) | Torque: Dry (K=0.20) | Torque: Lubed (K=0.12) |
|---|---|---|---|---|
| 1/4" | 20 | 965.9 | 4.0 ft-lbf | 2.4 ft-lbf |
| 5/16" | 18 | 1,627.0 | 8.5 ft-lbf | 5.1 ft-lbf |
| 3/8" | 16 | 2,406.4 | 15.0 ft-lbf | 9.0 ft-lbf |
| 7/16" | 14 | 3,300.6 | 24.1 ft-lbf | 14.4 ft-lbf |
| 1/2" | 13 | 4,406.0 | 36.7 ft-lbf | 22.0 ft-lbf |
| 9/16" | 12 | 5,651.1 | 53.0 ft-lbf | 31.8 ft-lbf |
| 5/8" | 11 | 7,017.3 | 73.1 ft-lbf | 43.9 ft-lbf |
| 3/4" | 10 | 10,370.7 | 129.6 ft-lbf | 77.8 ft-lbf |
| 7/8" | 9 | 14,345.1 | 209.2 ft-lbf | 125.5 ft-lbf |
| 1" | 8 | 18,816.3 | 313.6 ft-lbf | 188.2 ft-lbf |
| 1-1/4" | 7 | 30,087.5 | 626.8 ft-lbf | 376.1 ft-lbf |
| 1-1/2" | 6 | 43,625.3 | 1,090.6 ft-lbf | 654.4 ft-lbf |
■ Why Source Hastelloy C22 Fasteners from Ananka
- Precision Thread Rolling: To combat C22's rapid work-hardening characteristics, we heavily utilize cold roll-forming for external threads. This imparts beneficial residual compressive stresses into the thread root, maximizing fatigue life.
- Rigorous Thermal Processing: All our forged C22 fasteners undergo strict full solution annealing at 1121°C–1122°C (2050°F) followed by a rapid water quench to lock in the single-phase solid solution and guarantee corrosion resistance.
- 100% Traceability & PMI Testing: Every production lot is verified by handheld XRF to confirm exact alloy chemistry before dispatch, with heat numbers permanently stamped on bolt heads.
- ISO 9001:2015 Certified: Our quality management system covers incoming raw material, in-process NDT, solution anneal temperature control, and final thread-gauge certification.
- Global Export Infrastructure: We supply active infrastructure projects across the Middle East, Europe, Southeast Asia, and the Americas, with documentation tailored to destination regulatory requirements.
■ Frequently Asked Questions
Q1: What makes Hastelloy C22 superior to Hastelloy C276?
The primary architectural differentiator is chromium. C22 contains up to 22.5% chromium compared to C276's ~16%. This elevated chromium fraction imparts exceptional, rapid resistance to highly oxidizing media (like nitric acids and wet chlorine) while maintaining excellent resistance to reducing environments via its heavy molybdenum and tungsten content.
Q2: What ASTM standards govern Hastelloy C22 threaded fasteners?
Hastelloy C22 fasteners must be procured under ASTM F468 for bolts, screws, and studs, and ASTM F467 for mating nuts. These specifications mandate strict full-section destructive tensile testing, proof stress tests, and rigid dimensional inspections specific to non-ferrous, high-performance alloys.
Q3: Is Hastelloy C22 immune to Stress Corrosion Cracking (SCC)?
Yes, functionally immune. Because C22 possesses an exceptionally high nickel base (approximately 56%), it alters the slip planarity of the crystal lattice. In severe standardized testing (boiling 45% Magnesium Chloride), highly stressed C22 fasteners exhibited absolutely no transgranular cracking after 1,008 hours of continuous exposure.
Q4: Why must C22 fasteners be lubricated during assembly?
C22 is highly susceptible to thread galling (cold-welding). When tightened dry, the localized contact stress ruptures the ultra-thin oxide film, causing the bare, highly ductile nickel surfaces to atomically fuse. A heavy-duty anti-seize boundary lubricant is mandatory to drop the friction K-factor to ~0.12 and prevent the fastener from permanently seizing.
Q5: What are the differences between DIN and ISO metric hex bolts?
While generally interchangeable, critical wrenching size (Width Across Flats) deviations exist at M10, M12, M14, and M22 sizes. For example, an M12 bolt to DIN 931 requires a 19 mm socket, whereas an ISO 4014 M12 bolt requires an 18 mm socket. Specifying the exact standard is critical for field maintenance teams.
Q6: Can C22 fasteners be used in high-strength cold-worked conditions?
Yes. By cold-working the bar stock up to 47% reduction, C22 can achieve ultimate tensile strengths exceeding 1400 MPa (200+ ksi). However, these highly strained fasteners act as traps for monatomic hydrogen and must be carefully vetted before deployment in sour gas (H2S) or cathodic environments to prevent hydrogen embrittlement.