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Inconel 718 instrumentation tubes are specialized tubing products made from a high-strength, corrosion-resistant nickel-chromium alloy known as Inconel 718. This alloy is precipitation-hardenable, meaning it can be heat-treated to achieve high mechanical strength and hardness while maintaining excellent resistance to extreme environments. These properties make Inconel 718 ideal for use in demanding instrumentation systems where high pressure, high temperature, and corrosive conditions are present.
The key performance characteristics of Inconel 718 include exceptional tensile and yield strength, creep resistance, and fatigue durability, even at elevated temperatures up to 700°C (1300°F). Unlike standard stainless steel or lower-grade nickel alloys, Inconel 718 resists common forms of corrosion such as pitting, stress corrosion cracking, and oxidation, especially in environments involving seawater, sour gas, or aggressive chemicals.
In critical instrumentation applications—such as chemical injection lines, hydraulic control systems, aerospace fuel lines, or nuclear power monitoring circuits—Inconel 718 tubing ensures consistent and reliable performance over long service periods. Its clean internal surface finish supports precise fluid and gas transmission, while its robust material composition reduces maintenance needs and system downtime in critical processes.
These tubes are available in a range of sizes, typically with outer diameters from 6 mm to 25 mm (1/4" to 1") and wall thicknesses customized to meet pressure requirements. They are manufactured to stringent standards such as ASTM B444, AMS 5589, or ASTM B705, and can be supplied in annealed or age-hardened conditions depending on the application's strength and formability needs.
Specification of Inconel 718 Instrumentation tubes
| Parameter | Specification |
|---|---|
| Material | Inconel® 718 (UNS N07718, W.Nr. 2.4668) |
| Standards | ASTM B444, ASTM B705, AMS 5589, AMS 5590 |
| Outer Diameter (OD) | 6 mm to 25 mm (1/4" to 1") |
| Wall Thickness | 0.7 mm to 2.5 mm (custom available) |
| Length | Up to 6 meters (or custom cut-to-length) |
| Temper / Condition | Annealed / Solution Treated and Age Hardened (STA) |
| Density | 8.19 g/cm³ |
| Melting Point | 1260 – 1336°C (2300 – 2437°F) |
| Tensile Strength | ≥ 1,240 MPa (180 ksi, age-hardened) |
| Yield Strength (0.2%) | ≥ 1,030 MPa (150 ksi, age-hardened) |
| Elongation | ≥ 12% (in 50 mm gauge length) |
| Hardness | 331 HB max (annealed), up to 444 HB (age-hardened) |
| Temperature Range | -253°C to 700°C (-423°F to 1300°F) |
| Corrosion Resistance | Excellent – resistant to oxidation, pitting, crevice, and stress-corrosion cracking |
| Surface Finish | Bright annealed, pickled, or polished internal/external surfaces |
| Non-Magnetic | Yes (in annealed condition) |
| Applications | Aerospace, oil & gas, power generation, chemical injection, subsea instrumentation |
Overall, Inconel 718 instrumentation tubes are the preferred choice for high-reliability applications where material failure is not an option. Their combination of mechanical strength, corrosion resistance, and thermal stability makes them suitable for harsh industrial environments that demand precision and durability.
Chemical Composition of Inconel 718 Instrumentation tubes
| Element | Composition (% by weight) |
|---|---|
| Nickel (Ni) | 50.0 – 55.0 |
| Chromium (Cr) | 17.0 – 21.0 |
| Iron (Fe) | Balance |
| Niobium (Nb) + Tantalum (Ta) | 4.75 – 5.50 |
| Molybdenum (Mo) | 2.80 – 3.30 |
| Titanium (Ti) | 0.65 – 1.15 |
| Aluminium (Al) | 0.20 – 0.80 |
| Cobalt (Co) | ≤ 1.00 |
| Manganese (Mn) | ≤ 0.35 |
| Silicon (Si) | ≤ 0.35 |
| Carbon (C) | ≤ 0.08 |
| Sulfur (S) | ≤ 0.015 |
| Phosphorus (P) | ≤ 0.015 |
| Copper (Cu) | ≤ 0.30 |
| Boron (B) | ≤ 0.006 |
With a proven track record as a Inconel 718 Instrumentation 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 Inconel 718 tubing worldwide.
Specification of Inconel 718 Instrumentation tubes
| Parameter | Specification |
|---|---|
| Material | Inconel® 718 (UNS N07718, W.Nr. 2.4668) |
| Standards | ASTM B444, ASTM B705, AMS 5589, AMS 5590 |
| Outer Diameter (OD) | 6 mm to 25 mm (1/4" to 1") |
| Wall Thickness | 0.7 mm to 2.5 mm (custom available) |
| Length | Up to 6 meters (or custom cut-to-length) |
| Temper / Condition | Annealed / Solution Treated and Age Hardened (STA) |
| Density | 8.19 g/cm³ |
| Melting Point | 1260 – 1336°C (2300 – 2437°F) |
| Tensile Strength | ≥ 1,240 MPa (180 ksi, age-hardened) |
| Yield Strength (0.2%) | ≥ 1,030 MPa (150 ksi, age-hardened) |
| Elongation | ≥ 12% (in 50 mm gauge length) |
| Hardness | 331 HB max (annealed), up to 444 HB (age-hardened) |
| Temperature Range | -253°C to 700°C (-423°F to 1300°F) |
| Corrosion Resistance | Excellent – resistant to oxidation, pitting, crevice, and stress-corrosion cracking |
| Surface Finish | Bright annealed, pickled, or polished internal/external surfaces |
| Non-Magnetic | Yes (in annealed condition) |
| Applications | Aerospace, oil & gas, power generation, chemical injection, subsea instrumentation |
🏭 Industry & Application
- ✅ Inconel 718 Instrumentation Tubes for Medical Industry
- ✅ Inconel 718 Instrumentation Tubes for Chemical Processing
- ✅ Inconel 718 Tubes for Instrumentation Lines
- ✅ Inconel 718 Instrumentation tubes for Gas & Liquid Flow
- ✅ Inconel 718 Tubes for Heat Exchangers
❓ Frequently Asked Questions (FAQs)
Q1:What are Inconel 718 instrumentation tubes used for?
Inconel 718 instrumentation tubes are used in high-pressure, high-temperature, and highly corrosive environments. They are commonly found in aerospace systems, oil & gas wells, nuclear power plants, and chemical processing units, where reliable fluid or gas control is critical.
Q2:What makes Inconel 718 suitable for extreme environments?
Inconel 718 is a precipitation-hardened nickel-chromium alloy with exceptional strength, fatigue resistance, and creep resistance at temperatures up to 700°C (1300°F). It also offers excellent resistance to oxidation, chloride-induced corrosion, and stress-corrosion cracking, making it ideal for severe service conditions.
Q3:What standards do Inconel 718 tubes conform to?
Common manufacturing standards include ASTM B444, ASTM B705, AMS 5589, and AMS 5590. Tubes produced to these standards meet strict requirements for chemical composition, mechanical properties, and surface condition.
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