A common nickel-chromium alloy used in high-temperature applications like gas turbines, aircraft engines, and nuclear reactors is Inconel 718. The alloy has remarkable strength, resilience to corrosion, and durability at elevated temperatures. Owing to their superior mechanical and physical qualities, Inconel 718 bars are utilized extensively in the production of vital components, among other forms of the alloy. We’ll look closely at the composition, characteristics, applications, heat treatment, and corrosion resistance of Inconel 718 bars in this blog.
- 718 Composition of Inconel Alloy
Nickel Alloy 718 Bar is made up of a complex mixture of alloys, comprising titanium, nickel, chromium, iron, molybdenum, niobium, and tantalum. The exact makeup of the alloy may differ based on the producer, although it normally consists of 50–55% nickel, 17–21% chromium, 4.75–5.5% niobium, and trace amounts of other metals. While titanium is added to the alloy to aid improve its corrosion resistance, niobium is primarily used to strengthen the alloy at high temperatures.
| Grade | Ni | Cr | Cu | C | Mn | S | Mo | Si | Co |
| Inconel 718 | 50 – 55 | 17 – 21 | 0.3 max | 0.08 max | 0.35 max | 0.015 max | 2.8 – 3.3 | 0.35 max | 1.0 max |
- Inconel 718 Bars Physical characteristics:
Alloy 718 bars are very flexible, strong, and fatigue resistant. The alloy melts at 1,293°C and has a density of 8.19 g/cm3. At 100°C, Inconel 718 bars exhibit a thermal conductivity of around 10.1 W/m·K and a thermal expansion coefficient of 13.1 µm/m·K.
- Inconel 718 Bars Mechanical characteristics:
The manufacturing procedure and the heat treatment have an impact on the mechanical characteristics of Inconel 718 bars. At room temperature, the bars typically show a yield strength of 70 ksi and a tensile strength of 130 ksi. They also exhibit good creep-rupture strength at temperatures as high as 650–980°C.
| Density | Melting Point | Tensile Strength | Yield Strength (0.2%Offset) | Elongation |
| 8.2 g/cm3 | 1350 °C (2460 °F) | Psi – 135,000 , MPa – 930 | Psi – 70,000 , MPa – 482 | 45 % |
- Utilization of Inconel 718 Bars:
Werkstoff Nr. 2.4668 In the aerospace sector, hex bars are commonly utilized in vital components like compressor discs, gas turbine blades, rocket engines, and aircraft structural elements. The bars are also used in the medical sector for the production of prosthetics and surgical equipment. Due to its exceptional qualities, the alloy is a good fit for equipment used in chemical processing and nuclear reactors.
- Inconel 718 Bars Heat treatment:
The mechanical properties of Inconel 718 Hex Bar are greatly influenced by heat treatment. Typically, solution annealing is carried out at temperatures between 980 and 1,050 °C, and is followed by air cooling. Through the aid of this procedure, any potential secondary phases are dispersed uniformly, resulting in the precipitates of niobium carbide. The age-hardening process is also used to boost the mechanical strength of the bars.
- Resistance to corrosion in Inconel 718 Bars:
Because of their great resistance to corrosion, Inconel Alloy 718 Square Bar are appropriate for use in challenging settings. Because of its superior resistance to pitting and crevice corrosion, the alloy is a good fit for applications involving seawater and chloride-based materials. Moreover, the alloy is well-suited for usage in high-temperature applications due to its resistance to oxidation and sulfidation.
- In summary:
Because of their outstanding mechanical and physical qualities, remarkable resistance to corrosion, and ability to withstand high temperatures, Inconel 718 Square Bar are essential to many industries. Because of the alloy’s intricate composition and exacting manufacturing procedures, bars have extraordinary strength, flexibility, and fatigue resistance. The mechanical qualities of the bars are improved by precise heat treatment procedures, which makes them perfect for demanding applications. Although the bars have a wide range of applications, their high temperature and corrosion resistance make them a highly sought-after material.