Inconel-718-825-Capillary tubes, Inconel 718/825 Capillary Tube Manufacturer,Inconel 718/825 Capillary Tube Supplier, Inconel 718/825 Capillary Tube Exporter,Inconel 718/825 Precision Tubing, Inconel 718/825 Small Diameter Tube ,Inconel 718/825 Instrumentation Tubes
Inconel is a family of austenitic nickel-chromium-based superalloys known for their exceptional resistance to oxidation, corrosion, and high temperatures. Among the various Inconel grades, Inconel 718 and Inconel 825 are widely used for high-performance applications. Both alloys are known for their outstanding mechanical properties and chemical stability, making them ideal for harsh environments. When these alloys are manufactured into capillary tubes, they serve vital roles in industries such as aerospace, chemical processing, oil and gas, and instrumentation.
Capillary tubes are very small, thin-walled tubes that are used to transport fluids with high precision and under controlled conditions. Due to their narrow inner diameters, they allow accurate regulation of flow and are essential in applications where space is limited, and performance is critical. When made from superalloys like Inconel 718 or 825, these capillary tubes offer unparalleled reliability in extreme environments.
nconel 718 is a precipitation-hardenable nickel-chromium alloy that contains significant amounts of iron, niobium, and molybdenum. It is known for its high strength, excellent weldability, and outstanding creep-rupture strength. The alloy retains its properties at temperatures up to 700°C (1290°F), which makes it especially suitable for high-temperature applications.
Capillary tubes made from Inconel 718 are commonly used in aerospace engines, gas turbines, nuclear reactors, and other high-temperature systems. Their resistance to both oxidation and corrosion ensures that they can operate for long periods without degradation, even in chemically aggressive environments.
Specification of Inconel-718-825-Capillary tubes
| Property | Inconel 718 Capillary Tubes | Inconel 825 Capillary Tubes |
|---|---|---|
| Material Standard | ASTM B637, AMS 5589, AMS 5590 | ASTM B423, ASTM B163, ASTM B704 |
| Chemical Composition (% approx.) | Ni 50–55, Cr 17–21, Fe ≤18.5, Nb 4.75–5.5, Mo 2.8–3.3, Ti, Al, Co | Ni 38–46, Cr 19.5–23.5, Fe ≥22, Mo 2.5–3.5, Cu 1.5–3.0, Ti 0.6–1.2 |
| Tensile Strength | ≥ 1380 MPa (200 ksi) (age-hardened) | ≥ 585 MPa (85 ksi) |
| Yield Strength (0.2% offset) | ≥ 1035 MPa (150 ksi) | ≥ 240 MPa (35 ksi) |
| Elongation (% in 2 in) | ~12–18% | ~30% |
| Hardness (Rockwell) | RC 36–44 (age-hardened) | RB 80–90 |
| Density | 8.19 g/cm³ | 8.14 g/cm³ |
| Melting Range | 1260–1336 °C (2300–2436 °F) | 1370–1400 °C (2500–2550 °F) |
| Max Operating Temperature | ~700 °C (1290 °F) | ~540 °C (1000 °F) |
| Corrosion Resistance | Excellent in oxidizing, high-temperature environments | Excellent in acidic, reducing, and chloride-containing environments |
| Magnetic Properties | Non-magnetic | Slightly magnetic |
| Tube Size Range (OD) | 0.5 mm – 6.35 mm (custom sizes on request) | 0.5 mm – 6.35 mm (custom sizes on request) |
| Wall Thickness Range | 0.05 mm – 1.0 mm | 0.05 mm – 1.0 mm |
| Finish | Bright annealed / cold drawn / polished | Bright annealed / cold drawn / polished |
| Typical Applications | Jet engines, nuclear reactors, high-pressure lines, instrumentation | Chemical plants, marine systems, acid handling, oil & gas tubing |
One of the primary advantages of Inconel 718 capillary tubes is their exceptional mechanical strength under both low and high-temperature conditions. This makes them particularly valuable in structural and pressure-bearing applications. Additionally, Inconel 718 exhibits good fatigue resistance, making it suitable for cyclic loading scenarios such as vibration-heavy environments or pressure pulsations.
Chemical Composition of Inconel-718-825-Capillary tubes
| Element | Inconel 718 (% by weight) | Inconel 825 (% by weight) |
|---|---|---|
| Nickel (Ni) | 50.0 – 55.0 | 38.0 – 46.0 |
| Chromium (Cr) | 17.0 – 21.0 | 19.5 – 23.5 |
| Iron (Fe) | Balance (~17.0 max reported) | Balance (~22.0 min) |
| Molybdenum (Mo) | 2.8 – 3.3 | 2.5 – 3.5 |
| Niobium + Tantalum (Nb + Ta) | 4.75 – 5.50 | — |
| Titanium (Ti) | 0.65 – 1.15 | 0.6 – 1.2 |
| Aluminum (Al) | 0.20 – 0.80 | ≤ 0.2 |
| Copper (Cu) | ≤ 0.30 | 1.5 – 3.0 |
| Manganese (Mn) | ≤ 0.35 | ≤ 1.0 |
| Silicon (Si) | ≤ 0.35 | ≤ 0.5 |
| Cobalt (Co) | ≤ 1.0 (often present as impurity) | ≤ 1.0 |
| Carbon (C) | ≤ 0.08 | ≤ 0.05 |
| Phosphorus (P) | ≤ 0.015 | ≤ 0.02 |
| Sulfur (S) | ≤ 0.015 | ≤ 0.03 |
With a proven track record as a Inconel-718-825-Capillary tubes exporter in over 30 countries, Sumer Metal Industries ensures global availability, third-party inspection support, and client-specific customization. Our wide export network combined with strict quality standards has made us a preferred choice for SS 718/825 tubing worldwide.
Specification of Inconel-718-825-Capillary tubes
| Property | Inconel 718 Capillary Tubes | Inconel 825 Capillary Tubes |
|---|---|---|
| Material Standard | ASTM B637, AMS 5589, AMS 5590 | ASTM B423, ASTM B163, ASTM B704 |
| Chemical Composition (% approx.) | Ni 50–55, Cr 17–21, Fe ≤18.5, Nb 4.75–5.5, Mo 2.8–3.3, Ti, Al, Co | Ni 38–46, Cr 19.5–23.5, Fe ≥22, Mo 2.5–3.5, Cu 1.5–3.0, Ti 0.6–1.2 |
| Tensile Strength | ≥ 1380 MPa (200 ksi) (age-hardened) | ≥ 585 MPa (85 ksi) |
| Yield Strength (0.2% offset) | ≥ 1035 MPa (150 ksi) | ≥ 240 MPa (35 ksi) |
| Elongation (% in 2 in) | ~12–18% | ~30% |
| Hardness (Rockwell) | RC 36–44 (age-hardened) | RB 80–90 |
| Density | 8.19 g/cm³ | 8.14 g/cm³ |
| Melting Range | 1260–1336 °C (2300–2436 °F) | 1370–1400 °C (2500–2550 °F) |
| Max Operating Temperature | ~700 °C (1290 °F) | ~540 °C (1000 °F) |
| Corrosion Resistance | Excellent in oxidizing, high-temperature environments | Excellent in acidic, reducing, and chloride-containing environments |
| Magnetic Properties | Non-magnetic | Slightly magnetic |
| Tube Size Range (OD) | 0.5 mm – 6.35 mm (custom sizes on request) | 0.5 mm – 6.35 mm (custom sizes on request) |
| Wall Thickness Range | 0.05 mm – 1.0 mm | 0.05 mm – 1.0 mm |
| Finish | Bright annealed / cold drawn / polished | Bright annealed / cold drawn / polished |
| Typical Applications | Jet engines, nuclear reactors, high-pressure lines, instrumentation | Chemical plants, marine systems, acid handling, oil & gas tubing |
🏭 Industry & Application
- ✅ SS 718/825 Capillary Tubes for Medical Industry
- ✅ SS 718/825 Capillary Tubes for Chemical Processing
- ✅ SS 718/825 Tubes for Instrumentation Lines
- ✅ Inconel-718-825-Capillary tubes for Gas & Liquid Flow
- ✅ SS 718/825 Tubes for Heat Exchangers
❓ Frequently Asked Questions (FAQs)
Q1: What are Inconel 718 and Inconel 825 capillary tubes used for?
Inconel 718 capillary tubes are used in high-temperature, high-pressure environments like aerospace, nuclear power, and gas turbines. Inconel 825 capillary tubes are preferred for corrosive environments, such as chemical processing, marine systems, and acid-handling applications.
Q2: What is the key difference between Inconel 718 and Inconel 825?
Inconel 718 offers superior mechanical strength and can operate at higher temperatures (up to ~700°C). In contrast, Inconel 825 provides better corrosion resistance, especially in acidic and chloride-rich environments, but has a lower strength and temperature limit (~540°C).
Q3:Are Inconel capillary tubes corrosion-resistant?
Yes, both Inconel 718 and 825 offer excellent corrosion resistance. Inconel 825 is especially resistant to sulfuric acid, phosphoric acid, seawater, and stress-corrosion cracking.
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