Heat and Corrosion Resistant Inconel 718 Rods for Critical
Industrial Engineering Projects
Inconel 718 rods are nickel-chromium-based superalloys renowned for
their exceptional strength, corrosion resistance, and ability to
withstand extreme temperatures ranging from cryogenic levels up to
1300°F (704°C). This makes them ideal for demanding applications in aerospace,
marine engineering, and chemical processing industries.
Chemical Composition of Inconel 718 Rods:
| Element | Composition (%) |
|---|
| 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 |
| Aluminum (Al) | 0.20–0.80 |
| Cobalt (Co) | 1.0 max |
| Manganese (Mn) | 0.35 max |
| Silicon (Si) | 0.35 max |
| Carbon (C) | 0.08 max |
| Phosphorus (P) | 0.015 max |
| Sulfur (S) | 0.015 max |
Mechanical Properties of Inconel 718 Rods:
| Property | Value |
|---|
| Tensile Strength | 135–160 ksi (931–1103 MPa) |
| Yield Strength (0.2% Offset) | 70–120 ksi (482–827 MPa) |
| Elongation | 12–30% |
| Hardness (Rockwell C) | 25–40 HRC |
Physical Properties of Inconel 718 Rods:
| Property | Value |
|---|
| Density | 0.297 lb/in³ (8.22 g/cm³) |
| Melting Range | 2300-2437°F (1260-1336°C) |
| Specific Heat Capacity | 0.104Btu/lb·°F (430 J/kg·°C) |
| Thermal Conductivity | 77 Btu·in/h·ft²·°F (9.4 W/m·K) |
| Electrical Resistivity | 753 ohm circ mil/ft |
Key Features of Inconel 718 Rods:
Exceptional High-Temperature Strength: Maintains outstanding tensile and creep-rupture properties at
temperatures up to 1300°F (704°C).
Superior Corrosion Resistance: Exhibits excellent resistance to oxidation and corrosion in various
environments, including seawater and acidic conditions.
Excellent Weldability: Unlike many nickel-based alloys, Inconel 718 can be welded without
susceptibility to post-weld cracking.
Good Fabricability: Easily fabricated into complex components, making it suitable for
intricate designs.
Applications of Inconel 718 Rods:
Inconel 718 rods are utilized across various industries due to
their robust performance characteristics:
Aerospace: Ideal for manufacturing jet engine components, high-speed airframe
parts, and rocket motors, where high strength and thermal
resistance are critical.
Oil & Gas: Used in downhole equipment, wellhead components, and sub-sea
valves, benefiting from its strength and corrosion resistance in
harsh environments.
Marine Engineering: Suitable for seawater applications such as propeller blades and
mooring cables, owing to its resistance to pitting and crevice
corrosion.
Power Generation: Employed in nuclear reactors and gas turbines for components like
reactor-core and control-rod mechanisms, leveraging its strength
and corrosion resistance at high temperatures.
Frequently Asked Questions (FAQs):
Q1: What distinguishes Inconel 718 rods from other nickel-based
alloys?
A1: Inconel 718 rods offer a unique combination of high strength,
corrosion resistance, and excellent weldability, making them
suitable for a wide range of demanding applications.
Q2: Can Inconel 718 rods be used at cryogenic temperatures?
A2: Yes, Inconel 718 maintains good mechanical properties at cryogenic
temperatures, making it useful for applications requiring
low-temperature performance.
Q3: Are Inconel 718 rods suitable for marine environments?
A3: Absolutely, they offer exceptional resistance to pitting and
crevice corrosion in seawater, making them ideal for marine
engineering applications.
Q4: How does Inconel 718 perform in high-temperature environments?
A4: Inconel 718 retains high tensile and creep-rupture strength at
temperatures up to 1300°F (704°C), making it suitable for aerospace
and power generation applications
Q5: What are the machining characteristics of Inconel 718 rods?
A5: Inconel 718 can be readily fabricated into complex parts and
exhibits good weldability compared to other nickel-based
superalloys.
Inconel 718 rods provide a blend of high strength, excellent
corrosion resistance, and versatility, making them a preferred
