Inconel 718 Round Bar (UNS N07718)
Inconel 718 Round Bar is a precipitation-hardenable nickel-chromium alloy strengthened by the addition of niobium and molybdenum, delivering exceptionally high strength, outstanding fatigue resistance, and excellent corrosion and oxidation resistance. It is one of the most widely used superalloys for high-temperature and high-stress applications.
Inconel 718 Round Bar (also known as Alloy 718 Round Bar) maintains excellent mechanical properties from cryogenic temperatures up to about 700°C, with outstanding resistance to creep and rupture. Its superior weldability compared to many other nickel alloys makes it a preferred choice in aerospace, power generation, and oil & gas industries.
Key Features
- Extremely high tensile and yield strength after age hardening
- Excellent fatigue, creep, and stress-rupture resistance
- Outstanding oxidation and corrosion resistance
- Good weldability with minimal post-weld cracking
- Excellent performance at both low and high temperatures
Specification
| Parameter | Details |
|---|---|
| ASTM | ASTM B637 |
| ASME | SB637 |
| UNS Number | N07718 |
| AMS | AMS 5662, AMS 5663 |
| Material Type | Precipitation-Hardened Nickel Alloy |
| Form | Round Bar |
| Condition | Solution Treated, Aged |
Equivalent Grades
| Standard | Grade |
|---|---|
| UNS | N07718 |
| DIN | 2.4668 |
| EN | NiCr19Fe19Nb5Mo3 |
| JIS | NW 7718 |
Sizes
| Diameter Range | Length |
|---|---|
| 6 mm – 300 mm | 3 m, 6 m, Cut to Length |
| 1/4” – 12” | As per requirement |
Inconel 718 Chemical Composition
| Element | Percentage (%) |
|---|---|
| Nickel (Ni) | 50.0 – 55.0 |
| Chromium (Cr) | 17.0 – 21.0 |
| Iron (Fe) | Balance |
| Niobium + Tantalum (Nb+Ta) | 4.75 – 5.50 |
| Molybdenum (Mo) | 2.8 – 3.3 |
| Titanium (Ti) | 0.65 – 1.15 |
| Aluminum (Al) | 0.20 – 0.80 |
| Carbon (C) | ≤ 0.08 |
UNS N07718 Mechanical Properties
| Property | Value |
|---|---|
| Tensile Strength | ≥ 1240 MPa |
| Yield Strength | ≥ 1030 MPa |
| Elongation | ≥ 12% |
| Hardness | ~35 – 45 HRC |
Alloy 718 Round Bar Physical Properties
| Property | Value |
|---|---|
| Density | 8.19 g/cm³ |
| Melting Range | 1260 – 1336°C |
| Thermal Conductivity | ~11.4 W/m·K |
| Electrical Resistivity | ~1.25 µΩ·m |
Types of Inconel 718 Round Bar
- Hot Rolled Round Bar
- Forged Round Bar
- Solution Treated Round Bar
- Age Hardened Round Bar
- Bright / Precision Ground Round Bar
Applications
- Aerospace engine components and fasteners
- Gas turbines and power generation equipment
- Oil & gas downhole and subsea components
- Nuclear and high-pressure systems
- High-strength bolts, shafts, and rings
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