Hastelloy C22 Bolts Supplier
- Reliability in the Most Severe Environments
- Long Service Life and Low Maintenance Costs
- Stable Performance in Weld‑Affected Zones
Hastelloy C22 Bolts: The Ultimate Alloy Solution for Extreme and Complex Corrosion Resistance
SSM provides Hastelloy C-22 bolts engineered for the most critical services where exceptional resistance to both oxidizing and reducing environments, pitting, crevice corrosion, and stress-corrosion cracking is the primary requirement. These nickel-chromium-molybdenum-tungsten alloy fasteners deliver a unique combination of unparalleled chemical stability across a vast range of aggressive media, excellent thermal stability, and good mechanical strength. With superior resistance to wet chlorine, chlorides, mixed acids (including oxidizing salts and reducing acids), and contaminated process streams, Hastelloy C-22 bolts are the premier choice for the most demanding applications in chemical processing, flue gas desulfurization (FGD), pharmaceutical, pollution control, and marine industries.
Technical Specifications
| Parámetro | Descripción |
| Product Name | Hastelloy C-22 Bolts / Stud Bolts |
| Material | Nickel-Chromium-Molybdenum-Tungsten Alloy UNS N06022 |
| Tipo de producto | Bolts, Stud Bolts, Threaded Rods, Special Shapes |
| Key Strengths | Unparalleled Broad-Spectrum Corrosion Resistance (Oxidizing & Reducing Media, Pitting, Crevice, Stress-Corrosion Cracking); Excellent Thermal Stability; Good Mechanical Strength |
| Strengthening Method | Cold Worked (Primary method for achieving high strength). *Note: Hastelloy C-22 is a solid-solution strengthened alloy and is not age-hardenable.* |
| Tratamiento térmico | Solution Annealing (typically 1121-1149°C / 2050-2100°F) followed by rapid quenching to dissolve secondary phases and achieve optimal corrosion resistance. |
| Rango de temperatura | Cryogenic to Approx. 1040°C (1900°F) for continuous service in oxidizing atmospheres; long-term use above 425°C (800°F) requires evaluation for microstructural stability. |
| Resistencia a la corrosión | Excellent/Outstanding resistance to: Wet Chlorine & Hypochlorites, Chloride Solutions, Mixed Acids (including Oxidizing Salts like FeCl₃, CuCl₂), Reducing Acids (HCl, H₂SO₄), Contaminated Process Streams, FGD Environments. Resistance to nitric acid is limited. |
| Unique Property | Essentially Non-Magnetic; Superior Weldability with minimal susceptibility to precipitation of harmful phases in weld-affected zones; High Pitting Resistance Equivalent Number (PREN ≥ 65). |
| Normas aplicables | ASTM / ASME (B574, B575, F468), AMS 5759, DIN 17744, ISO 6208 (customizable) |
| Rango de tallas | Customized (M3 to M64 & equivalent inch series) |
| Acabado de la superficie | Pickled & Clean (post-annealing) / Bright Machined. Passivation is not applicable as it is not a stainless steel. |
| Primary Applications | FGD Absorber Towers & Ducting, Chemical Reactors (Halogenated Media), Pulp & Paper Bleach Plants, Waste Incineration & Pollution Control Systems, Pharmaceutical Reactors, Marine & Offshore Critical Components. |
| Certification | EN 10204 3.1 / 3.2, Mill Test Certificates, PMI (Positive Material Identification) Report, Full Traceability |
| Warranty | As per specific contract and application conditions |
| After-sales Service | Full technical documentation, critical application analysis & alloy selection consultation (e.g., C-22 vs. C-276 vs. 625), welding and fabrication support, failure analysis. |
Material Properties – Hastelloy C22 Bolts
Hastelloy C-22 is a nickel-chromium-molybdenum-tungsten alloy distinguished by its exceptionally broad and balanced corrosion resistance. It offers a unique combination of outstanding resistance to both oxidizing and reducing media, excellent resistance to localized corrosion (pitting, crevice, and stress-corrosion cracking), and very good thermal stability and fabricability. As a solid-solution strengthened, non-age-hardenable material, its strength is primarily achieved through cold working.
Chemical Composition (wt.%)
(Conforms to ASTM B574 / ASME SB-574 for UNS N06022)
| Elemento | Content Range (Typical) | Primary Function |
| Níquel (Ni) | Balance (~56%) | Base element, provides fundamental metallurgical stability and resistance to reducing environments and stress-corrosion cracking. |
| Cromo (Cr) | 20.0 – 22.5% | Imparts resistance to oxidizing media (e.g., wet chlorine, hypochlorites, nitric acid contaminants) and enhances high-temperature oxidation resistance. |
| Molibdeno (Mo) | 12.5 – 14.5% | Provides primary resistance to reducing acids (e.g., HCl, H₂SO₄) and dramatically improves resistance to pitting and crevice corrosion in chloride environments. |
| Tungsteno (W) | 2.5 – 3.5% | Enhances overall corrosion resistance in a wide range of media and contributes to thermal stability. |
| Hierro (Fe) | 2.0 – 6.0% | Balancing element; content is controlled to optimize structural stability and corrosion performance. |
| Cobalto (Co) | ≤ 2,5% | Impurity element, strictly controlled. |
| Manganeso (Mn) | ≤ 0,50% | Maximum allowable impurity. |
| Vanadio (V) | ≤ 0,35% | Maximum allowable impurity. |
| Silicio (Si) | ≤ 0,08% | Strictly controlled impurity to prevent deleterious phase formation. |
| Carbono (C) | ≤ 0,015% | Very low carbon minimizes carbide precipitation in weld-affected zones, preserving corrosion resistance. |
| Fósforo (P) | ≤ 0,02% | Strictly controlled harmful impurity. |
| Azufre (S) | ≤ 0,02% | Strictly controlled harmful impurity. |
Typical Mechanical Properties for Fasteners (Solution Annealed & Quenched)
Annealed Condition (Solution Treated):
- Tensile Strength: 690 – 827 MPa (100 – 120 ksi)
- Yield Strength (0.2% Offset): 310 – 414 MPa (45 – 60 ksi)
- Alargamiento: ≥ 45%
- Hardness: Rockwell B 85 – 100
Cold Worked Condition (for higher strength fasteners):
- Tensile Strength: 827 – 1034 MPa (120 – 150 ksi) or higher
- Yield Strength (0.2% Offset): 690 – 896 MPa (100 – 130 ksi) or higher
- Alargamiento: 20% – 35%
- Hardness: Rockwell C 20 – 30 (approx.)
Hastelloy C22 Bolts Typical Applications
- Flue Gas Desulfurization (FGD) systems (absorber towers, ducting).
- Chemical processing equipment handling halogenated compounds, mixed acids, or contaminated streams.
- Pollution control, waste incineration, and pulp/paper bleach plants.
- Pharmaceutical and fine chemical reactors requiring resistance to aggressive cleaning agents.
- Marine and offshore components exposed to severe chloride-induced corrosion.
Proveedor integral de bridas para todas sus necesidades
SSM has significant product advantages in manufacturing Hastelloy C22 Bolts. Whether it’s quality or price, we will meet your needs.
Hastelloy C22 Bolts Standards and Specifications
Hastelloy C-22 bolts (UNS N06022) are a premium corrosion-resistant fastener solution engineered for the most demanding environments, valued for their exceptional resistance to oxidizing and reducing acids, chloride-induced pitting/crevice corrosion, and stress-corrosion cracking in chemical processing, flue gas desulfurization (FGD), pharmaceutical, pollution control, and marine industries. The main standards and specifications are organized below.
| Categoría | Standard / System | Description / Notes (For Hastelloy C-22 Bolts) |
| Material Standards | UNS N06022 | Nickel-chromium-molybdenum-tungsten alloy grade. Core identification for the most versatile corrosion-resistant alloy. |
| ASTM B574 / ASME SB-574 | Standard specification for bar and wire (primary material standard). | |
| ASTM B575 / ASME SB-575 | Standard specification for plate, sheet, and strip. | |
| ASTM B366 / ASME SB-366 | Standard specification for nickel alloy forgings. | |
| AMS 5759 | Aerospace Material Specification for bar, forgings, and rings. | |
| Fastener Standards | ASTM F468 / F468M | Nonferrous bolts, hex cap screws, and studs for general use (inch/metric). Key fastener specification. |
| ASME B18.2.1 / B18.31.2 | Hex bolts and stud bolts dimensional standards. | |
| MIL Specs (e.g., MIL-DTL-46882) | May be referenced for defense applications; grade must be specified as UNS N06022. | |
| European / International Standards | DIN 17744 | German standard for nickel and nickel alloy semi-finished products. |
| EN 10204 3.1 / 3.2 | Material test certificate (mandatory for EU projects). | |
| Chemical, Metallurgical & Processing | ASTM B574 / AMS 5759 | Define required chemical composition ranges for UNS N06022. |
| Tratamiento térmico | Solution Annealed & Quenched (typically 1121-1149°C). This condition is essential to achieve optimal corrosion resistance. | |
| Magnetic Property | Essentially non-magnetic (austenitic structure). | |
| Inspection & Testing | ASTM E8 | Tensile testing at room temperature (mandatory). |
| ASTM E10 / E18 | Brinell/Rockwell hardness testing. | |
| PMI Testing (XRF / OES) | Critical to confirm alloy grade and distinguish from similar alloys (e.g., C-276, C-2000, 625). | |
| Intergranular Corrosion Test | Often specified per ASTM G28 Method A or ASTM G48 Methods A & B to verify resistance to pitting/crevice corrosion. | |
| Microstructure Examination | Per ASTM E112 / E562 to check for deleterious phase precipitation (e.g., μ-phase). | |
| High-Temperature Tensile/Stress Rupture | May be specified for elevated temperature applications. | |
| Tratamiento de superficies | Cleaning / Pickling | Per ASTM B366 or internal procedures to remove heat treatment scale. Essential for corrosion performance. |
| Passivation | Not applicable. Hastelloy C-22 does not form a chromium oxide passive layer like stainless steel. | |
| Anti-Galling Coatings | May be applied (e.g., PTFE, Molykote) based on application requirements. | |
| Industry Standards / References | ASME Boiler & Pressure Vessel Code, Section II & VIII | Referenced for pressure vessel, heat exchanger, and reactor components. |
| NACE MR0175 / ISO 15156 | Material requirements for sour (H₂S) service. C-22 has excellent resistance to sulfide stress cracking. | |
| FGD & Pollution Control Standards | Widely referenced for scrubbers, absorbers, and ducting in power/chemical plants. | |
| Pharmaceutical (FDA, ASME BPE) | Referenced for high-purity and aggressive chemical processing equipment. | |
| Aerospace (e.g., AMS) | Referenced for critical components in aggressive environments. | |
| Marine & Offshore Standards (e.g., NORSOK) | Referenced for seawater handling, chlorination systems, and topside components. |
Hastelloy C-22 is a premier, high-performance nickel-chromium-molybdenum-tungsten alloy renowned for its exceptional and comprehensive corrosion resistance — capable of withstanding both oxidizing and reducing acids, aggressive chloride environments, and complex mixed-media conditions — coupled with outstanding resistance to localized attack (pitting, crevice corrosion, and stress-corrosion cracking) and excellent thermal stability. As a solid-solution strengthened alloy, its high strength is typically achieved through cold working. It is the ultimate material of choice for the most demanding applications in chemical processing, flue gas desulfurization (FGD), pharmaceutical, and pollution control industries where complete material reliability in complex, aggressive, and often contaminated environments is non-negotiable.
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