Table of Contents
- Introduction
- What are Hastelloy C22 Flanges?
- Types of Hastelloy C22 Flanges We Export
- Chemical Composition & Mechanical Properties
- Corrosion Resistance Mechanisms of Alloy C22
- Pressure Ratings & Standards
- Applications of Hastelloy C22 Flanges
- Why Hastelloy C22 Flanges are Preferred over Other Alloys
- Why Choose SankalPalloys
- Quality Assurance & Testing Protocols
- Global Export & Supply Network
- Frequently Asked Questions (FAQs)
- Conclusion
Introduction
In modern high-stress processing plants, severe corrosion and high temperatures constantly threaten the structural safety of piping infrastructure. Standard stainless steels often succumb to rapid pitting, stress cracking, and acid degradation under extreme processing conditions. To address these critical engineering challenges, high-performance nickel-based alloys are required.
Hastelloy C22 Flanges serve as essential connecting hardware designed to maintain leak-proof, highly durable joints in the most demanding fluid handling systems. As a prominent Hastelloy C22 Flanges Exporter In India, SankalPalloys manufactures and exports precision-engineered alloy flanges engineered to withstand aggressive chemical environments. Our products cater to major engineering projects across North America, Europe, the Middle East, Asia-Pacific, and global markets.
What are Hastelloy C22 Flanges?
Hastelloy C22 Flanges (uns designated as UNS N06022 or commonly called Alloy C22) are specialized forged piping components used to join pipes, valves, pumps, heat exchangers, and pressure vessels. Alloy C22 is a versatile nickel-chromium-molybdenum-tungsten alloy that provides remarkable resistance to both oxidizing and reducing media, significantly outperforming conventional alloys like SS 316, Hastelloy C276, and Alloy 625 in mixed chemical environments.
These flanges act as critical safety junctions, allowing assembly, disassembly, maintenance, and inspection of piping networks without compromising structural strength. Available in various face profiles such as Raised Face (RF), Ring Type Joint (RTJ), and Flat Face (FF), Hastelloy C22 Flanges provide reliable performance under extreme pressures and temperatures.
Types of Hastelloy C22 Flanges We Export
At SankalPalloys, we stock and manufacture a diverse range of Hastelloy C22 flange configurations to meet international piping codes:
1. Hastelloy C22 Weld Neck Flanges (WNF)
Designed with a long tapered hub, these flanges are butt-welded to pipes. They provide smooth stress distribution, making them ideal for high-pressure, high-temperature, and cyclic loading applications.
2. Hastelloy C22 Slip-On Flanges (SOF)
Slip-on flanges slide over the pipe end and are welded both inside and outside. They are cost-effective, easy to align, and suited for moderate pressure systems.
3. Hastelloy C22 Blind Flanges (BLRF)
Used to block or seal off the end of a piping system or vessel opening. Blind flanges withstand significant mechanical stress and high internal pressures during maintenance shutdowns.
4. Hastelloy C22 Socket Weld Flanges (SWF)
Feature a socket in which the pipe is inserted before welding. These are ideal for small-bore, high-pressure piping systems where smooth internal flow is required.
5. Hastelloy C22 Threaded Flanges (THDF)
Designed with internal threads, allowing them to be attached to pipes without welding. Suitable for hazardous or explosive environments where welding is prohibited.
6. Hastelloy C22 Lap Joint Flanges (LJF)
Used in combination with a stub end, allowing full 360-degree rotation during assembly. This design simplifies alignment in complex or frequently dismantled piping setups.
7. Hastelloy C22 Long Weld Neck & Custom Flanges
Engineered with extended neck lengths for specialized reactor nozzles, heavy vessel connections, and custom blueprints tailored to client specifications.
Chemical Composition & Mechanical Properties
The exceptional performance of Hastelloy C22 stems from its precisely balanced chemical matrix. The combination of chromium, molybdenum, tungsten, and nickel ensures broad-spectrum protection against corrosive reagents.
Chemical Composition of Hastelloy C22 (UNS N06022):
- Nickel (Ni): Balance (approx. 56.0%)
- Chromium (Cr): 20.0–22.5%
- Molybdenum (Mo): 12.5–14.5%
- Tungsten (W): 2.5–3.5%
- Iron (Fe): 2.0–6.0%
- Cobalt (Co): 2.5% max
- Manganese (Mn): 0.50% max
- Carbon (C): 0.010% max
- Silicon (Si): 0.08% max
- Phosphorus (P): 0.02% max
- Sulfur (S): 0.02% max
Mechanical Properties (At Room Temperature):
- Tensile Strength: 690 MPa (100,000 psi) min
- Yield Strength (0.2% Offset): 310 MPa (45,000 psi) min
- Elongation: 45% min
- Density: 8.69 g/cm³
- Melting Point: 1357°C–1399°C (2475°F–2550°F)
- Excellent resistance to intergranular corrosion in the weld heat-affected zone (HAZ)
- High mechanical strength and fatigue resistance in cryogenic and elevated temperatures
Corrosion Resistance Mechanisms of Alloy C22
Hastelloy C22 is regarded as one of the most versatile nickel-chromium-molybdenum-tungsten alloys available. Its unique formulation provides specific chemical protection mechanisms:
- Oxidizing Environments: The high concentration of Chromium (20.0–22.5%) creates a stable passive oxide film that resists ferric and cupric chlorides, wet chlorine gas, nitric acid, and chlorine dioxide solutions.
- Reducing Environments: The inclusion of Molybdenum (12.5–14.5%) and Tungsten (2.5–3.5%) imparts exceptional immunity to reducing media such as sulfuric acid, hydrochloric acid, phosphoric acid, and acetic acid.
- Pitting & Crevice Attack: The high Pitting Resistance Equivalent Number (PREN) of Hastelloy C22 protects flanged connections from localized crevice corrosion beneath gaskets or within stagnant fluid zones.
- Stress Corrosion Cracking (SCC): High nickel content prevents chloride-induced stress corrosion cracking, a common failure mode in 300-series stainless steels.
Pressure Ratings & Standards
SankalPalloys exports Hastelloy C22 Flanges manufactured to global dimensional and pressure standard classes, ensuring seamless integration with existing processing units:
- Pressure Classes: Class 150#, 300#, 400#, 600#, 900#, 1500#, and 2500#
- Nominal Pipe Sizes (NPS): 1/2" NB to 48" NB (DN15 to DN1200)
- Flange Facing Types: Raised Face (RF), Flat Face (FF), Ring Type Joint (RTJ), Male & Female (M&F), Tongue & Groove (T&G)
- Dimensional Standards: ANSI/ASME B16.5, ASME B16.47 Series A & B, MSS SP-44, BS 4504, EN 1092-1, DIN standards
Applications of Hastelloy C22 Flanges
Chemical & Petrochemical Processing
Used extensively in acid synthesis units, organic chemical processing plants, esterification vessels, and reaction columns operating under aggressive chloride and acid streams.
Oil & Gas Exploration & Refining
Essential for sour gas (H2S) extraction wells, offshore platforms, subsea equipment, and refinery units handling sour crude oil and hot halide-laden fluids.
Flue Gas Desulfurization (FGD) Systems
Critical for power plant scrubber systems, reheaters, duct linings, and stack dampers where sulfur dioxide gas condenses into highly corrosive acidic liquids.
Pharmaceuticals & Fine Chemicals
Deployed in reactors, mixing vessels, and high-purity piping manifolds where batch contamination must be prevented and equipment cleanability is paramount.
Pulp & Paper Manufacturing
Utilized in bleach plants, chlorine dioxide bleach towers, and liquor digester systems that cause rapid degradation of lesser metal alloys.
Waste Treatment & Marine Engineering
Applied in hazardous waste incinerators, industrial wastewater treatment systems, seawater cooling lines, and nuclear fuel reprocessing facilities.
Why Hastelloy C22 Flanges are Preferred over Other Alloys
When selecting flange materials for severe service, engineers often evaluate options like Hastelloy C276, Hastelloy C4, and Inconel 625. Hastelloy C22 stands out due to its optimized chromium content (approx 22% compared to C276's 16%). This higher chromium content gives C22 vastly superior performance in oxidizing media and mixed acid solutions.
Furthermore, Hastelloy C22 resists thermal degradation during welding better than many other nickel alloys. It exhibits minimal carbide and intermetallic phase precipitation in the weld heat-affected zone, allowing as-welded flanged joints to retain full corrosion resistance without requiring post-weld heat treatment.
Why Choose SankalPalloys
State-of-the-Art Manufacturing
SankalPalloys uses advanced forging presses, precision CNC machining, and automated thread-cutting tools to manufacture Hastelloy C22 Flanges with tight dimensional tolerances and superior surface finishes.
Comprehensive Material Traceability
Every product supplied by SankalPalloys is backed by full material traceability from raw heat numbers to final inspection reports, ensuring authentic UNS N06022 grade chemistry.
Custom Engineering Capabilities
We supply custom flange sizes, non-standard pressure classes, specialized bevels, and custom hub profiles tailored to complex engineering drawings and project requirements.
Competitive Pricing & Fast Turnaround
Our organized raw material inventory and efficient production lines enable us to offer competitive pricing and quick turnaround times for urgent project call-offs.
Quality Assurance & Testing Protocols
To ensure total reliability in mission-critical applications, all Hastelloy C22 Flanges undergo strict non-destructive and destructive testing before dispatch:
- Positive Material Identification (PMI): XRF testing to verify chemical composition.
- Ultrasonic & Radiographic Testing: NDT methods to detect internal voids, cracks, or inclusions in forged bodies.
- Hydrostatic & Pneumatic Pressure Testing: Verifies pressure-containing integrity.
- Dimensional & Surface Inspection: Micro-caliper and roughness gauge checks for face finishes and thread accuracy.
- Documentation Provided: EN 10204 3.1 Material Test Certificates, Third-Party Inspection (TPI) reports (BV, TUV, DNV, SGS upon request), and Mill Test Reports.
Global Export & Supply Network
Seaworthy Packaging & Logistics
As an experienced exporter, SankalPalloys packs Hastelloy C22 Flanges in wooden boxes, bubble wrap, and plastic caps to protect flange faces and threads from damage during ocean or air transit.
Global Export Destinations
We export Hastelloy C22 Flanges from India to major industrial centers in UAE, Saudi Arabia, Qatar, Oman, Kuwait, USA, UK, Germany, Italy, Netherlands, Singapore, Malaysia, Australia, and worldwide.
Frequently Asked Questions (FAQs)
Q: What types of Hastelloy C22 Flanges do you export?
A: We export a complete range of Hastelloy C22 Flanges, including Weld Neck, Slip-On, Blind, Socket Weld, Threaded, Lap Joint, and custom Long Weld Neck flanges across all standard pressure classes.
Q: Do you export Hastelloy C22 Flanges globally from India?
A: Yes, SankalPalloys exports certified Hastelloy C22 Flanges directly from India to clients across the Middle East, Europe, Americas, Southeast Asia, and worldwide.
Q: What is the main difference between Hastelloy C22 and C276?
A: Hastelloy C22 contains higher chromium (22% vs 16%), providing superior resistance to oxidizing chemicals, wet chlorine, and mixed acid streams compared to C276.
Q: Are Material Test Certificates provided with Hastelloy C22 Flanges?
A: Yes, every batch is accompanied by EN 10204 3.1 Material Test Certificates (MTC), PMI test reports, chemical and mechanical test results, and dimensional inspection sheets.
Q: Can you manufacture Hastelloy C22 Flanges to custom dimensions?
A: Yes, we manufacture custom flange sizes, special pressure ratings, unique wall thicknesses, and specialized facing profiles according to client engineering drawings.
Conclusion
Hastelloy C22 Flanges are vital components for industrial applications operating under harsh chemical environments and high operational stresses. Their balanced chemistry of nickel, chromium, molybdenum, and tungsten delivers long-term corrosion resistance, structural safety, and operational efficiency.
SankalPalloys is a trusted Hastelloy C22 Flanges Exporter In India, delivering high-performance flanges manufactured to international standards. Supported by comprehensive testing protocols, robust inventory, and reliable global shipping, we fulfill project demands with quality and precision.
Contact us today to request a quote or discuss your technical requirements for Hastelloy C22 Flanges.