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Hastelloy C22 Fasteners Supplier in Mumbai, India – UNS N06022 / Werkstoff 2.4602
Nicorex Alloys is a supplier of Hastelloy C22 fasteners in Mumbai, India. Hastelloy C22 fasteners are made from ASTM B574 bar stock, and forgings are produced to ASTM B564.
This grade carries the highest chromium content (22%) in the Ni-Cr-Mo C-family. That extra Cr gives Alloy C-22 bolts stronger passivation in oxidising environments. In harsh process environments containing ferric ions, cupric chlorides, or dissolved oxygen, weld heat-affected-zone (HAZ) corrosion often causes bolt failure. In these conditions, UNS N06022 is the preferred fastener material. Its balanced composition of about 56% nickel, 22% chromium, 13% molybdenum, and 3% tungsten protects against both oxidising and reducing acids. However, its standout advantage is exceptional resistance in oxidising media, making Hastelloy C22 fasteners especially reliable for critical bolted joints.
They typically have a tensile strength of 690 MPa (100 ksi), a yield strength of 310 MPa (45 ksi), and 45% elongation. These fasteners are available as hex bolts, stud bolts, socket head cap screws, nuts, lock nuts, washers, threaded rods, U-bolts, set screws, and eye bolts. They are supplied in standard sizes from M6 to M100 (1/4″ to 4″) with UNC, UNF, and metric thread options. They are approved to NACE MR0175 / ISO 15156 and have a PREN above 65, giving better pitting corrosion resistance than other nickel-based super alloys. Very low carbon (0.015%) and silicon (0.08%) prevent weld heat-affected-zone precipitation, so weld studs keep full corrosion resistance without post-weld heat treatment. Operations are certified to ISO 9001 and ISO 14001 standards.
Hastelloy C22 Fastener Specifications
| Standard | ASTM B574 / ASME SB-574 |
|---|---|
| Forms | Bolts, Nuts, Screws, Washers, Studs, Threaded Rods, Hex Bolts, Socket Head Cap Screws, Hex Nuts, Lock Nuts, Stud Bolts |
| Size | M6 – M100 (Metric); 1/4″ – 4″ (Imperial) |
| Length | 3 mm – 200 mm; Custom lengths available |
| Diameter | M6 – M100 (Metric); 1/4″ – 4″ (Imperial) |
| Thread Types | UNC, UNF, Metric Coarse, Metric Fine, BSW, BSF |
| Surface Finishes | Bright Finish, Pickled, Passivated, Hot-Dip Galvanized, Electropolished |
| Available Conditions | Solution Annealed |
Chemical Composition of Hastelloy C22 Fasteners
| Element | Nickel (Ni) | Chromium (Cr) | Molybdenum (Mo) | Tungsten (W) | Iron (Fe) | Cobalt (Co) | Vanadium (V) | Carbon (C) | Silicon (Si) | Copper (Cu) |
|---|---|---|---|---|---|---|---|---|---|---|
| Composition (%) | Balance (~56) | 20.0–22.5 | 12.5–14.5 | 2.5–3.5 | 2.0–6.0 | 2.5 max | 0.35 max | 0.015 max | 0.08 max | 0.50 max |
Mechanical Properties of Hastelloy C22 Fasteners
| Property | Tensile Strength (min) | Yield 0.2% (min) | Elongation (min) | Hardness (max) |
|---|---|---|---|---|
| Value | 690 MPa (100 ksi) | 310 MPa (45 ksi) | 45% | 241 HB |
C22’s 310 MPa yield (vs C276’s 283 MPa) provides 10% higher achievable bolt preload. This matters for high-pressure flange sealing in pharmaceutical reactor closures and ASME Section VIII pressure vessels. The 45% elongation gives stud bolts and threaded rods exceptional tolerance to thermal cycling.
Hastelloy C22 Fastener Equivalent Grades
| Standard System | UNS | Werkstoff Number | DIN | EN | JIS | GOST | AFNOR | ISO |
|---|---|---|---|---|---|---|---|---|
| Equivalent Grade | N06022 | 2.4602 | NiCr21Mo14W | NiCr21Mo14W | Not Specified | Not Specified | Not Specified | Not Specified |
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Types of Hastelloy C22 Fasteners Available
Hastelloy C22 Hex Bolts
Hastelloy C22 Stud Bolts
Hastelloy C22 Socket Head Cap Screws
Hastelloy C22 Hex Nuts
Hastelloy C22 Lock Nuts
Hastelloy C22 Flat Washers
Hastelloy C22 Threaded Rods
Hastelloy C22 U-Bolts
Hastelloy C22 Set Screws
Hastelloy C22 Eye Bolts
Surface Finish and Coating Options for Hastelloy C22 Fasteners
- Plain / Self-Colour: Standard
- Passivated: Citric or nitric acid passivation
- PTFE Coated: Anti-galling thread coating
- Manganese Phosphate: Thread lubricity
- Silver Plated: High-temperature anti-seize
- Anti-Seize: Nickel-based mandatory
Note: Galvanising NOT applicable.
Industries and Applications for Hastelloy C22 Fasteners
- Pharmaceutical and biotechnology: Reactor vessel closure studs in oxidising acid service, high-purity mixer bolting, and clean-in-place (CIP) system hardware.
- FGD and pollution control: Transition duct flange bolting, quench system studs, absorber tower internals fasteners.
- Waste incineration: Scrubber vessel bolting in mixed acid condensates with Fe³⁺ ions, quench tower flange studs.
- Chemical processing: Oxidiser vessel closure bolting, chlorination plant hardware, acetic acid reactor studs.
- Nuclear waste processing: Vitrification equipment bolting, reprocessing vessel studs, and high-level waste container hardware.
- Pulp and paper: Bleach sequence equipment bolting in ClO₂ environments with dissolved oxygen.
How to Order Hastelloy C22 Fasteners from Nicorex Alloys
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Fastener Type - Hex Bolt, Stud Bolt, Socket Head Cap Screw, Nut, Washer, Threaded Rod, Anchor Bolt
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Size - Diameter × Length in mm or inches
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Thread Type - UNC, UNF, BSW, Metric Coarse/Fine
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Material Grade - Hastelloy C22 / UNS N06022
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Standard - ASTM F468 / ASTM F467 / ASME SB574
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Finish - Bare, Passivated, Pickled
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Condition - Solution Annealed
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Quantity - Number of Pieces or kg
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Additional Requirements - NACE MR0175 compliance, specific heat numbers, chemical processing / FGD service
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Documentation - MTC 3.1 per EN 10204, PMI report, third-party inspection certificate
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Packaging - Standard wooden box / export-grade sea-worthy packing / ISPM 15 compliant
- Delivery Destination - Domestic / International
Frequently Asked Questions
Why Choose Hastelloy C22 over C276 for Fasteners?
What ASTM Specification Covers Hastelloy C22 Fasteners?
C22 fasteners are machined from ASTM B574 (UNS N06022) bar stock. No separate ASTM F468 is listed for C22. Forgings conform to ASTM B564. Always specify the bar specification and required mechanical properties when ordering.