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Incoloy 825 Ferrule Fittings are high-performance components designed for applications requiring exceptional corrosion resistance and mechanical strength. These fittings are manufactured from a nickel-iron-chromium alloy containing significant additions of molybdenum, copper, and titanium, which provide superior resistance to oxidizing and reducing acids. The alloy maintains outstanding performance even in environments containing sulfuric and phosphoric acids, seawater, and alkalis. Incoloy 825 Ferrule Fittings are used widely in industries such as oil & gas, chemical processing, power generation, and marine engineering. The unique composition ensures protection against stress-corrosion cracking and pitting corrosion, even in high chloride conditions. The fittings maintain stability at elevated temperatures and offer excellent weldability, making them suitable for both seamless and welded tubing connections.
These ferrule fittings are engineered to deliver leak-proof and vibration-resistant joints in piping and instrumentation systems. Each fitting consists of a body, front ferrule, back ferrule, and nut, designed to ensure consistent gripping and sealing performance during assembly. The precise mechanical construction ensures uniform tube contact and proper alignment for superior flow characteristics. Incoloy 825 material enhances resistance to localized attack, ensuring long-term reliability in aggressive industrial environments. These fittings undergo stringent dimensional and surface finish inspections to ensure perfect fit and performance consistency. Their mechanical integrity allows them to withstand high pressures and fluctuating thermal conditions without deformation or leakage. They are available in double ferrule and single ferrule configurations, depending on application requirements.
Incoloy 825 Ferrule Fittings find extensive use in industries where exposure to corrosive chemicals is unavoidable. In chemical processing plants, these fittings are used for connecting lines that carry sulfuric acid, phosphoric acid, and nitric acid solutions. The presence of molybdenum and copper in the alloy provides enhanced resistance to reducing media, while the chromium content resists oxidation. These fittings are also highly effective in offshore and marine environments, where resistance to seawater-induced corrosion is critical. Furthermore, their high tensile and yield strength ensure stability even under dynamic loading conditions. The fittings also maintain ductility and toughness at subzero temperatures, making them versatile for varied process conditions.
Each Incoloy 825 Ferrule Fitting is manufactured according to stringent international standards such as ASTM B366 and ASME SB366. The fittings are available in various types including unions, elbows, tees, adapters, connectors, and bulkhead fittings to meet diverse connection needs. Dimensional accuracy is maintained through precision machining and cold-working techniques that improve mechanical strength and surface finish. Testing includes hydrostatic pressure checks, pneumatic leak tests, and non-destructive examinations to ensure flawless performance. These fittings are designed for compatibility with standard tubing and pipe systems, providing flexibility for both new installations and retrofit projects. Additionally, they are supplied with material traceability certificates and optional third-party inspection reports upon request.
Incoloy 825 Ferrule Fittings exhibit exceptional metallurgical stability and resistance to intergranular corrosion after welding. The alloy’s titanium addition stabilizes the microstructure, preventing carbide precipitation during high-temperature exposure. This feature ensures that the fittings retain their corrosion resistance even in post-weld conditions or after extended service in harsh chemical environments. The fittings can operate effectively in temperatures up to 540°C without loss of mechanical strength or corrosion performance. Their fabrication involves advanced machining, forging, and annealing processes to achieve the desired mechanical properties and dimensional accuracy. This combination of properties makes them one of the most reliable choices for high-stress and corrosive service applications.
The versatility of Incoloy 825 Ferrule Fittings makes them suitable for a wide range of industries. They are used in pollution control equipment, pickling equipment, acid production plants, and offshore oil platforms. Their ability to resist oxidation, carburization, and scaling allows them to perform reliably even in oxidizing environments. They also show excellent resistance to chloride-induced stress corrosion cracking, a common problem in marine and industrial chemical plants. Maintenance costs are reduced due to their long service life and resistance to surface degradation. These fittings are also compatible with various tubing materials, including stainless steel and other nickel-based alloys. Their robust design and material strength provide both safety and reliability in critical applications.
Manufacturers offer Incoloy 825 Ferrule Fittings in various sizes, pressure ratings, and end connection types to meet specific system requirements. Standard sizes range from 1/8” to 2” OD tubing, while custom dimensions can be produced upon request. The fittings can be supplied with bright or passivated finishes depending on the desired aesthetic and corrosion resistance level. Installation is simple, following standard ferrule compression assembly techniques. With superior leak-tight sealing capability and mechanical performance, Incoloy 825 Ferrule Fittings have become a preferred choice for engineers seeking durability and performance under demanding conditions. These fittings represent a balance of strength, corrosion resistance, and precision engineering — ideal for any industrial environment where safety and reliability are critical.
Specification Table
| Specification | Details |
|---|---|
| Product Name | Incoloy 825 Ferrule Fittings |
| Material | Nickel-Iron-Chromium Alloy with Molybdenum, Copper, and Titanium |
| Standard | ASTM B366 / ASME SB366 |
| Fitting Types | Union, Elbow, Tee, Cross, Reducer, Adapter, Bulkhead, Connector, Cap, Nut, Plug |
| Size Range | 1/8” OD to 2” OD (Custom sizes available on request) |
| Pressure Rating | Up to 6000 PSI (Depending on size and wall thickness) |
| Temperature Range | -196°C to 540°C (-320°F to 1000°F) |
| Thread Standards | NPT, BSP, BSPT, ISO, SAE, or as per customer requirement |
| End Connections | Male/Female Threaded, Welded, Compression Type, Flared |
| Form | Single Ferrule, Double Ferrule |
| Finish | Bright Annealed / Polished / Passivated |
| Testing | Hydrostatic Test, Pneumatic Leak Test, Non-Destructive Testing (NDT) |
| Certification | EN 10204 3.1 / 3.2, Raw Material Test Certificates, PMI Report, NACE MR0175 (on request) |
| Applications | Chemical Processing, Oil & Gas, Marine Engineering, Pollution Control, Heat Exchangers |
Chemical Composition (Typical ranges for SSMoly 825)
Note: Values are typical ranges. Final composition will be confirmed on MTC provided per lot.
| Element | Content (%) |
|---|---|
| Nickel (Ni) | 38.0 – 46.0 |
| Iron (Fe) | Balance |
| Chromium (Cr) | 19.5 – 23.5 |
| Molybdenum (Mo) | 2.5 – 3.5 |
| Copper (Cu) | 1.5 – 3.0 |
| Titanium (Ti) | 0.6 – 1.2 |
| Manganese (Mn) | ≤ 1.0 |
| Silicon (Si) | ≤ 0.5 |
| Carbon (C) | ≤ 0.05 |
| Aluminum (Al) | ≤ 0.2 |
| Sulfur (S) | ≤ 0.03 |
Mechanical Properties (Typical)
| Property | Metric Values | Imperial Values |
|---|---|---|
| Tensile Strength (Minimum) | 550 MPa | 79,800 psi |
| Yield Strength (0.2% Proof, Minimum) | 220 MPa | 31,900 psi |
| Elongation (in 50 mm) | 30% | 30% |
| Hardness (Brinell) | ≤ 200 HB | ≤ 200 HB |
| Density | 8.14 g/cm³ | 0.294 lb/in³ |
| Melting Range | 1370 – 1400°C | 2500 – 2550°F |
| Modulus of Elasticity | 196 GPa | 28.4 × 10³ ksi |
| Poisson’s Ratio | 0.30 | 0.30 |
Equivalent Grades
| Standard | Grade | Description |
|---|---|---|
| UNS | N08825 | Unified Numbering System designation for Incoloy 825 |
| Werkstoff Nr. | 2.4858 | German / European Material Number |
| AFNOR | NC 21 FeDU | French Designation for Incoloy 825 |
| BS | NA16 | British Standard designation |
| JIS | NW8825 | Japanese Industrial Standard |
| GOST | ЭИ699 | Russian Standard Equivalent |
| EN | NiCr21Mo | European Norm designation |
Dimension & Weight Chart (Selected common sizes)
Below is a representative chart showing outside diameter, wall thickness, inside diameter, cross-sectional area of metal and calculated weight per metre (kg/m). Values are calculated using density = 7.93 g/cm³ and are for guidance — use actual MTC values for procurement & engineering.
| Tube OD (inches) | Thread Size | Length (mm) | Across Flats (mm) | Approx. Weight (grams) |
|---|---|---|---|---|
| 1/8" | 1/8" NPT | 26 | 14 | 18 |
| 1/4" | 1/4" NPT | 32 | 17 | 30 |
| 3/8" | 3/8" NPT | 37 | 19 | 45 |
| 1/2" | 1/2" NPT | 42 | 22 | 65 |
| 5/8" | 5/8" NPT | 46 | 24 | 82 |
| 3/4" | 3/4" NPT | 50 | 27 | 110 |
| 1" | 1" NPT | 56 | 32 | 160 |
| 1 1/4" | 1 1/4" NPT | 62 | 41 | 210 |
| 1 1/2" | 1 1/2" NPT | 68 | 46 | 275 |
| 2" | 2" NPT | 78 | 55 | 380 |
Types Of Incoloy 825 Ferrule Fittingss and Tubes
Stainless Steel Ferrule Fitting
Monel 400 Ferrule Fitting
Hastelloy Ferrule Fitting
Nickel Ferrule Fitting
Super Duplex Ferrule Fitting
Duplex Ferrule Fitting
Inconel 600 Ferrule Fitting
Monel K500 Ferrule Fitting
Frequently Asked Questions (FAQ)
What are Incoloy 825 Ferrule Fittings?
Incoloy 825 Ferrule Fittings are high-performance compression fittings made from a nickel-iron-chromium alloy with additions of molybdenum, copper, and titanium. These fittings provide superior corrosion resistance in both oxidizing and reducing environments, making them suitable for chemical, marine, and high-temperature applications.
What industries use Incoloy 825 Ferrule Fittings?
These fittings are widely used in industries such as chemical processing, oil and gas, marine engineering, power generation, and pollution control systems. They are also suitable for acid production plants and offshore environments where corrosion resistance and durability are essential.
What standards do Incoloy 825 Ferrule Fittings comply with?
Incoloy 825 Ferrule Fittings are manufactured according to ASTM B366 / ASME SB366 specifications. They are also available with certifications such as EN 10204 3.1 / 3.2, NACE MR0175 compliance, and can undergo hydrostatic and non-destructive testing for quality assurance.
What temperature range can Incoloy 825 Ferrule Fittings withstand?
These fittings are designed to operate efficiently in temperatures ranging from -196°C to 540°C (-320°F to 1000°F). They maintain their mechanical strength and corrosion resistance across this wide range, making them suitable for both cryogenic and high-temperature applications.
Are Incoloy 825 Ferrule Fittings resistant to acids?
Yes. Incoloy 825 Ferrule Fittings exhibit excellent resistance to sulfuric acid, phosphoric acid, nitric acid, and organic acids. The presence of molybdenum and copper enhances resistance to reducing acids, while chromium ensures stability in oxidizing environments.
What sizes are available for Incoloy 825 Ferrule Fittings?
Standard sizes range from 1/8” OD to 2” OD tubing. Custom dimensions and configurations are available upon request to meet specific system or project requirements. Fittings can be supplied with NPT, BSP, or metric threads.
What are the main advantages of using Incoloy 825 Ferrule Fittings?
These fittings offer superior corrosion resistance, high strength, leak-tight sealing, and excellent mechanical stability at elevated temperatures. They are easy to install, compatible with multiple tube materials, and provide a long service life in aggressive environments.
Can Incoloy 825 Ferrule Fittings be used with other metals?
Yes. Incoloy 825 Ferrule Fittings can be used with compatible metals such as stainless steel, Monel, and other nickel-based alloys. However, proper selection should be made to avoid galvanic corrosion when dissimilar metals are in contact in a corrosive environment.
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