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Inconel 718 Ferrule Fittings are high-strength, corrosion-resistant components designed to perform reliably under extreme environments. This nickel-chromium alloy exhibits excellent mechanical properties at both low and elevated temperatures, making it suitable for a variety of high-performance applications. These ferrule fittings maintain remarkable resistance to oxidation, pitting, and crevice corrosion even in aggressive chemical and marine atmospheres. Their superior design ensures leak-free performance and high pressure-handling capability in instrumentation and tubing systems.
Manufactured using premium grade Inconel Alloy 718 (UNS N07718 / WNR 2.4668), these fittings are heat-treated for enhanced strength, stress rupture, and fatigue resistance. Inconel 718 Ferrule Fittings exhibit outstanding weldability and fabricability compared to other precipitation-hardened nickel alloys. They are ideal for applications involving continuous exposure to temperatures up to 700°C (1300°F) without loss of structural integrity. Each fitting is precision machined to ensure accurate connections and long service life under harsh working conditions.
One of the key advantages of Inconel 718 Ferrule Fittings lies in their excellent tensile and creep-rupture properties. These fittings perform efficiently in dynamic pressure systems and high-vibration environments, such as gas turbines, nuclear reactors, jet engines, and chemical processing equipment. The combination of nickel, chromium, and molybdenum in the alloy enhances its oxidation resistance and durability, even in chloride-bearing or acidic media. Their non-magnetic nature and high corrosion resistance make them preferred for sensitive and critical operations.
These ferrule fittings are available in single and double ferrule configurations to meet diverse industrial requirements. The double ferrule design provides secure and leak-proof joints in both vacuum and pressure systems. Inconel 718 Tube Fittings are compatible with stainless steel, copper, and other alloy tubing materials. They are commonly used in aerospace hydraulic systems, oil & gas pipelines, chemical reactors, and power generation plants where performance and reliability are critical. The fittings are easy to install, maintain, and replace without special tools.
Inconel 718 Ferrule Fittings are designed as per international standards like ASTM B637 and AMS 5662/5663. They are manufactured in compliance with ISO and ASME guidelines to guarantee precision and safety. Each fitting undergoes rigorous quality testing including hydrostatic, pneumatic, and dimensional accuracy checks. This ensures that customers receive consistent and dependable fittings with guaranteed performance under high-stress conditions. The fittings also undergo non-destructive testing to verify material integrity.
These fittings can withstand environments containing acids, alkalis, seawater, and oxidizing salts without significant degradation. The high nickel content provides resistance against stress-corrosion cracking and carburization. Their strength-to-weight ratio and fatigue resistance make them ideal for aerospace structures and cryogenic applications. Inconel 718 Ferrule Fittings retain their mechanical stability even after long-term exposure to cyclic heating and cooling conditions. The fittings are suitable for both standard and custom instrumentation assemblies.
Suppliers offer Inconel 718 Ferrule Fittings in various types including Union, Elbow, Tee, Cross, Reducer, Adapter, and Connector configurations. They are available in sizes ranging from 1/16” to 2” and in both metric and imperial dimensions. Surface finishing options such as passivation and electropolishing improve corrosion resistance and aesthetic appearance. With excellent quality control and technical support, Inconel 718 Ferrule Fittings ensure maximum safety and long-lasting operation across multiple sectors including chemical, power, petrochemical, and marine industries.
Specification Table
| Specification | Details |
|---|---|
| Product Name | Inconel 718 Ferrule Fittings |
| Material Grade | Inconel Alloy 718 / UNS N07718 / WNR 2.4668 |
| Standards | ASTM B637 / ASME SB637 |
| Size Range | 1/16” OD to 2” OD (Metric sizes available on request) |
| Connection Type | Single Ferrule / Double Ferrule Compression Type |
| Pressure Rating | Up to 6000 PSI (Dependent on size and wall thickness) |
| Temperature Range | -250°C to +700°C (-420°F to 1300°F) |
| Thread Standards | NPT, BSP, BSPT, ISO, SAE, and other international threads |
| End Connections | Tube to Tube, Tube to Male/Female Thread, Tube to Pipe |
| Types Available | Union, Elbow, Tee, Cross, Adapter, Reducer, Connector |
| Testing | Hydrostatic, Pneumatic, Dimensional, PMI, and NDT Tests |
| Applications | Aerospace, Oil & Gas, Power Generation, Marine, Chemical Processing |
Chemical Composition (Typical ranges for SSMoly 718)
Note: Values are typical ranges. Final composition will be confirmed on MTC provided per lot.
| Element | Percentage (%) |
|---|---|
| Nickel (Ni) | Balance (Min 58.0) |
| Chromium (Cr) | 20.0 – 23.0 |
| Molybdenum (Mo) | 8.0 – 10.0 |
| Niobium + Tantalum (Nb + Ta) | 3.15 – 4.15 |
| Iron (Fe) | ≤ 5.0 |
| Carbon (C) | ≤ 0.10 |
| Manganese (Mn) | ≤ 0.50 |
| Silicon (Si) | ≤ 0.50 |
| Phosphorus (P) | ≤ 0.015 |
| Sulfur (S) | ≤ 0.015 |
| Aluminum (Al) | ≤ 0.40 |
| Titanium (Ti) | ≤ 0.40 |
| Cobalt (Co) | ≤ 1.0 |
| Copper (Cu) | ≤ 0.50 |
Mechanical Properties (Typical)
| Property | Metric | Imperial |
|---|---|---|
| Tensile Strength (Minimum) | 827 MPa | 120,000 psi |
| Yield Strength (0.2% Offset) | 414 MPa | 60,000 psi |
| Elongation in 50 mm | 30% | 30% |
| Hardness (Brinell) | ≤ 220 HB | ≤ 220 HB |
| Melting Point | 1290 – 1350 °C | 2350 – 2460 °F |
| Density | 8.44 g/cm³ | 0.305 lb/in³ |
| Modulus of Elasticity | 207 GPa | 30 × 10⁶ psi |
| Poisson’s Ratio | 0.29 – 0.30 | 0.29 – 0.30 |
Equivalent Grades
| Standard | Equivalent Grade | Description |
|---|---|---|
| UNS | N06625 | Unified Numbering System designation for Inconel 625 alloy |
| Werkstoff Nr. | 2.4856 | German standard material number for Inconel 625 |
| ASTM | B446 / B444 / B564 | Nickel-Chromium-Molybdenum alloy bar, pipe, and forging specifications |
| ASME | SB446 / SB444 / SB564 | ASME equivalent standards for ASTM grades |
| BS | NA21 | British Standard designation for Inconel 625 |
| EN | NiCr22Mo9Nb | European Norm designation for Inconel 625 alloy |
| AFNOR | NC22DNb | French designation for Nickel-Chromium-Molybdenum alloy with Niobium |
| JIS | NCF 625 | Japanese Industrial Standard for Inconel 625 |
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 (mm) | Thread Size | Length (L) mm | Across Flats (A/F) mm | Approx. Weight (grams) |
|---|---|---|---|---|
| 3 | 1/8" NPT | 25 | 11 | 10 |
| 6 | 1/4" NPT | 28 | 14 | 15 |
| 8 | 1/4" NPT | 32 | 17 | 22 |
| 10 | 3/8" NPT | 36 | 19 | 30 |
| 12 | 3/8" NPT | 38 | 22 | 38 |
| 15 | 1/2" NPT | 42 | 27 | 55 |
| 18 | 1/2" NPT | 45 | 30 | 70 |
| 22 | 3/4" NPT | 50 | 32 | 95 |
| 25 | 3/4" NPT | 55 | 36 | 120 |
| 28 | 1" NPT | 60 | 41 | 150 |
| 32 | 1" NPT | 65 | 46 | 185 |
| 38 | 1 1/4" NPT | 70 | 50 | 230 |
| 50 | 1 1/2" NPT | 80 | 60 | 350 |
Types Of Inconel 718 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 is Inconel 625 and why use it for ferrule fittings?
Inconel 625 (UNS N06625) is a nickel-chromium-molybdenum alloy strengthened by niobium & tantalum. It offers high strength, excellent toughness, and outstanding resistance to pitting, crevice corrosion and oxidation at elevated temperatures. :contentReference[oaicite:1]{index=1} Ferrule fittings made from Inconel 625 are ideal for harsh environments (high temperature, corrosive media) where standard stainless steels would degrade more quickly.
What applications are ferrule fittings in Inconel 625 commonly used for?
They’re widely used in chemical processing, offshore oil & gas, power generation, high‐temperature systems, seawater/brine systems, and wherever corrosion resistance + high temperature service are required.
How do I verify the material grade and quality of an Inconel 625 ferrule?
Request the mill test certificate (MTC) showing UNS N06625, the chemical composition (Ni, Cr, Mo, Nb + Ta etc), heat treatment, and mechanical test results. Ensure the manufacturer follows ASTM/ASME specs appropriate for fittings.
Are there limitations or special considerations when using Inconel 625 ferrule fittings?
Yes. Although highly corrosion‐resistant, design still needs to account for proper selection of wall thickness, temperature/pressure conditions, and compatibility with the environment (chlorides, sulfides, high temp, etc). Also cost is higher compared with standard alloys. For extremely high temperature or highly oxidizing media other alloys may be required.
Can Inconel 625 ferrule fittings be welded or fabricated?
Yes — Inconel 625 is weldable and can be fabricated into fittings. However ensure proper welding procedure (qualified filler, pre‐/post‐weld treatments if needed) and that the ferrule is designed for the specific system. For critical services consult manufacturer’s guidelines.
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