Our commonly used material introduction: InconelX-750 nickel-chromium based superalloy physical properties overview

Gas turbine and other high temperature, high pressure environment. This alloy exhibits excellent oxidation resistance, corrosion resistance and high temperature strength under extreme conditions, making it an ideal material for many high-performance applications. In this paper, we will introduce the physical properties of Inconel X-750 nickel-chromium based superalloy in detail to help you better understand its advantages and application prospects.

1. Main components of Inconel X-750

Inconel X-750 is a nickel-containing alloy consisting mainly of nickel (Ni), chromium (Cr), iron (Fe), aluminum (Al), molybdenum (Mo) and titanium (Ti). Its chemical composition is as follows:

• Nickel (Ni): 70%-75%
• Chromium (Cr): 15%-17%
• Iron (Fe): 6%-10%
• Molybdenum (Mo): 0.5%-1.5%
• Aluminum (Al): 1%-2%
• Titanium (Ti): 0.5%-1%

This combination gives Inconel X-750 excellent high temperature performance and corrosion resistance, allowing it to maintain stable mechanical properties in high temperature environments.

2.High temperature strength and creep resistance

An important advantage of the Inconel X-750 is its excellent high temperature strength and creep resistance. In high temperature environments, metal materials often lose strength due to material expansion and deformation caused by high temperature. The Inconel X-750 maintains high strength and creep resistance at temperatures from 1500°F (approximately 815°C) to 1800°F (approximately 982°C) through a special aluminization treatment. This makes it ideal for critical components used for long-term operation under high temperature conditions.

Specifically, the Inconel X-750 typically has a creep strength of approximately 20,000 psi (138 MPa) or more, which means that it can withstand high temperatures and prolonged use without deformation.

3. Oxidation resistance and corrosion resistance

At high temperature, metal alloys often face oxidation problems, resulting in the formation of an oxide layer on the surface of the alloy, which affects its performance. The high chromium content of Inconel X-750 makes it extremely resistant to oxidation and can be exposed to oxygen for a long time at high temperatures above 1000°C without easily oxidizing. This characteristic makes the Inconel X-750 widely used in the aviation, aerospace and gas turbine industries.

In corrosive environments, the Inconel X-750 is also resistant to attack by a variety of chemicals, especially acids, chlorides and sulfides. This makes it ideal for use in the chemical industry and in highly corrosive environments.

4. Thermal expansion coefficient

Thermal expansion coefficient is an important index to evaluate the volume change of materials when heated. The Inconel X-750 has a relatively low coefficient of thermal expansion, which means that its size changes less at high temperatures, effectively avoiding the accumulation of thermal stress caused by high temperatures and reducing the risk of cracks and damage. The coefficient of linear expansion of the Inconel X-750 is approximately 13.4×10⁻⁶/°C between room temperature and 1000°C.

5. Melting point and density

Inconel X-750 has a melting point of about 1300°C to 1370°C, meaning that it is able to operate stably in high-temperature environments until it reaches very high temperatures. Inconel X-750 has a density of approximately 8.3 g/cm³, which allows it to maintain good mechanical properties under high loads and high temperatures.

6. Mechanical properties

At room temperature, Inconel X-750 exhibits excellent mechanical properties, especially at high temperatures, with strength, tensile strength and fatigue life far exceeding those of ordinary alloy materials. Its tensile strength can reach more than 1000 MPa, yield strength can reach more than 600 MPa. At higher temperatures, these properties decline, but it can still maintain high strength even at up to 1000°C.

7. Summary: Advantages of the Inconel X-750

In summary, Inconel X-750 nickel-chromium based superalloy has several significant physical properties:

• High temperature strength: It can maintain high strength and creep resistance in extremely high temperature environments.
• Oxidation resistance: Excellent oxidation resistance, suitable for high temperature oxidation environment.
• Corrosion resistance: can effectively resist a variety of chemical corrosion, widely used in corrosive environment.
• Low coefficient of thermal expansion: small size change at high temperatures, reducing thermal stress and crack generation.
• Good mechanical properties: excellent tensile strength and fatigue resistance.

Due to these superior physical properties, Inconel X-750 is widely used in aerospace, gas turbines, chemical equipment and other fields, and is an ideal alloy material in high temperature and high pressure environments.

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