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Inconel 718/825 Pipe Fittings is a premium nickel-chromium-based alloy designed for extreme environments. Known for its exceptional corrosion resistance and high-temperature strength, this alloy is widely used in chemical, marine, and aerospace industries. The combination of nickel, chromium, and other alloying elements provides outstanding durability, making it ideal for demanding applications where ordinary stainless steel would fail.
Inconel 718 Pipe Fittings is specifically formulated to deliver superior mechanical properties. It exhibits excellent tensile strength, creep resistance, and oxidation resistance even at temperatures up to 1300°F (704°C). This makes it suitable for high-pressure applications such as gas turbines, jet engines, and nuclear reactors. Its ability to maintain structural integrity under thermal stress ensures long service life in harsh conditions.
Inconel 718 and 825 pipe fittings are high-performance nickel-based alloys engineered for extreme industrial conditions. These fittings are designed to provide superior corrosion resistance, high strength, and excellent mechanical performance at elevated temperatures. They are widely used in chemical processing, petrochemical, marine, aerospace, and power generation industries.
Inconel 718 is primarily composed of nickel (50–55%), chromium (17–21%), iron (balance), along with niobium, molybdenum, and small amounts of titanium and aluminum. Inconel 825 contains approximately 38–46% nickel, 19–23% chromium, 2.5–3.5% molybdenum, and trace amounts of titanium and copper. These compositions enhance corrosion resistance in acidic and chloride-rich environments.
Inconel 825 Pipe Fittings offers enhanced resistance to corrosion in acidic and chloride-containing environments. With additions of molybdenum and copper, it shows exceptional performance in sulfuric acid, phosphoric acid, and seawater applications. This makes it a preferred choice in chemical processing plants, desalination plants, and offshore oil and gas facilities where long-term reliability is critical.
Manufacturing and Fabrication of Inconel 718/825 Pipe Fittings involves precision engineering to ensure dimensional accuracy and consistent quality. These Fittingss are available in various sizes, thicknesses, and surface finishes to meet diverse industrial requirements. They can be welded, machined, and formed using standard industrial processes without compromising the alloy’s superior properties.
Inconel 718/825 fittings provide high tensile and yield strength suitable for high-pressure applications. Inconel 718 typically exhibits tensile strength of 1240–1380 MPa and yield strength of 1030–1170 MPa, while Inconel 825 offers tensile strength of 585–690 MPa and yield strength around 241–414 MPa. Elongation ranges from 20–40%, offering both strength and flexibility.
Both alloys offer outstanding resistance to pitting, crevice corrosion, and stress corrosion cracking. Inconel 718 is particularly resistant to high-temperature oxidation and creep, while Inconel 825 excels in reducing and acidic environments. These properties make them suitable for chemical processing plants, offshore oil and gas systems, and marine pipelines.
Specification Table
| Property | Inconel 718 | Inconel 825 |
|---|---|---|
| Standards | ASTM B564, ASME SB564 | ASTM B366, ASME SB366 |
| Type | Nickel-Chromium Alloy | Nickel-Iron-Chromium Alloy |
| Form | Elbows, Tees, Reducers, Caps, Stub Ends | Elbows, Tees, Reducers, Caps, Stub Ends |
| Application | High-temperature, corrosion-resistant, aerospace, chemical | Corrosion-resistant, chemical processing, marine, industrial |
| Temperature Range | Up to 1300°F (704°C) | Up to 1000°F (538°C) |
| Corrosion Resistance | Excellent resistance to oxidation and carburization | Excellent resistance to acids and chloride environments |
Chemical Composition (Typical ranges for SSS32760)
Note: Values are typical ranges. Final composition will be confirmed on MTC provided per lot.
| Element | Inconel 718 (%) | Inconel 825 (%) |
|---|---|---|
| Nickel (Ni) | 50–55 | 38–46 |
| Chromium (Cr) | 17–21 | 19.5–23.5 |
| Iron (Fe) | Balance | 28–34 |
| Cobalt (Co) | ≤1.0 | ≤2.0 |
| Molybdenum (Mo) | 2.8–3.3 | 2.5–3.5 |
| Copper (Cu) | ≤0.3 | 1.5–3.0 |
| Niobium (Nb) + Tantalum (Ta) | 4.75–5.5 | 0.9–1.4 |
| Titanium (Ti) | 0.65–1.15 | 0.2–0.8 |
| Aluminium (Al) | 0.2–0.8 | 0.2–0.6 |
| Manganese (Mn) | ≤0.35 | ≤1.0 |
| Silicon (Si) | ≤0.35 | ≤0.5 |
| Carbon (C) | ≤0.08 | ≤0.05 |
| Phosphorus (P) | ≤0.015 | ≤0.03 |
| Sulfur (S) | ≤0.015 | ≤0.03 |
Mechanical Properties (Typical)
| Property | Inconel 718 | Inconel 825 |
|---|---|---|
| Ultimate Tensile Strength (UTS) | 1240–1380 MPa (180–200 ksi) | 585–827 MPa (85–120 ksi) |
| Yield Strength (0.2% offset) | 1035–1100 MPa (150–160 ksi) | 276–414 MPa (40–60 ksi) |
| Elongation (in 50 mm) | 12–20% | 30–45% |
| Hardness | HRC 35–41 | HRB 85–95 |
| Modulus of Elasticity | 205 GPa (29.7 ×10⁶ psi) | 200 GPa (29 ×10⁶ psi) |
| Density | 8.19 g/cm³ | 8.41 g/cm³ |
| Melting Range | 1260–1336°C | 1350–1400°C |
| Operating Temperature | Up to 704°C (1300°F) | Up to 538°C (1000°F) |
Equivalent Grades
| Standard / Specification | Inconel 718 | Inconel 825 |
|---|---|---|
| ASTM / ASME | ASTM B564, SB564 | ASTM B366, SB366 |
| UNS | UNS N07718 | UNS N08825 |
| EN / European | EN 2.4668 | EN 2.4856 |
| BS / British Standard | BS NCF 718 | BS NCF 825 |
| DIN / German | DIN 2.4668 | DIN 2.4856 |
| JIS / Japanese | JIS NCF718 | JIS NCF825 |
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.
| Nominal Size (inches) | Schedule | Outside Diameter (OD, mm) | Wall Thickness (mm) | Weight per Piece (kg) | Fitting Type |
|---|---|---|---|---|---|
| 1/2" | 10 | 21.3 | 2.77 | 0.5 | Elbow |
| 3/4" | 10 | 26.7 | 2.87 | 0.7 | Elbow |
| 1" | 10 | 33.4 | 3.38 | 1.1 | Elbow |
| 1 1/2" | 10 | 48.3 | 3.91 | 2.8 | Elbow |
| 2" | 10 | 60.3 | 4.55 | 4.5 | Elbow |
| 2 1/2" | 10 | 73.0 | 5.16 | 6.8 | Elbow |
| 3" | 10 | 88.9 | 5.49 | 9.8 | Elbow |
| 4" | 10 | 114.3 | 6.02 | 17.5 | Elbow |
| 6" | 10 | 168.3 | 7.11 | 36.0 | Elbow |
| 8" | 10 | 219.1 | 8.18 | 62.0 | Elbow |
Types Of Pipe Fittingss and Tubes
Tube Unions
Bite Type Tube Fittings
Stainless Steel Pipe Fittings
Forged Fsitting
Fitting
Carbon Steel Butt Weld Pipe Fittings
Frequently Asked Questions (FAQ)
1. What are Inconel 718/825 Pipe Fittings?
Inconel 718 and 825 pipe fittings are nickel-based alloys designed for high-temperature, corrosion-resistant applications. They are commonly used in chemical, petrochemical, aerospace, and marine industries.
2. What types of fittings are available?
These include elbows, tees, reducers, caps, and stub ends. Each fitting is available in various sizes and schedules to suit different piping requirements.
3. What is the temperature resistance of Inconel 718/825 fittings?
Inconel 718 fittings can operate up to 704°C (1300°F), while Inconel 825 fittings are suitable up to 538°C (1000°F), making them ideal for high-temperature applications.
4. Are these fittings corrosion-resistant?
Yes, both alloys offer excellent corrosion resistance. Inconel 718 resists oxidation and carburization, while Inconel 825 is highly resistant to acids and chloride environments.
5. What standards do Inconel 718/825 Pipe Fittings conform to?
Inconel 718 fittings comply with ASTM B564 / ASME SB564, UNS N07718, and EN 2.4668. Inconel 825 fittings comply with ASTM B366 / ASME SB366, UNS N08825, and EN 2.4856.
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