PMI STEEL Inconel Alloy X-750 is a precipitation-hardenable nickel-chromium alloy used for its corrosion and oxidation resistance and high strength at temperatures to 1300°F. Although much of the effect of precipitation hardening is lost with increasing temperature over 1300°F, heat-treated material has useful strength up to 1800°F. Inconel X-750 also has excellent properties down to cryogenic temperatures.

Inconel X-750 is used extensively in rocket-engine thrust chambers.Airframe applications include thrust eversers and hot-air ducting systems. Large pressure vessels are formed from Inconel X-750. Other applications are heat-treating fixtures, forming tools, extrusion dies, and test machine grips.

Product Description

Inconel X-750 (USA), NiCr15Fe7TiAl (Germany), NC15FeTNbA (France), NCF750 (Japan)

Inconel alloy X-750 is a precipitation-hardening nickel-chromium alloy. It exhibits good corrosion resistance and oxidation resistance below 980°C, high strength below 800°C, and excellent relaxation resistance below 540°C. Additionally, it has good forming and welding properties. This alloy is primarily used for manufacturing flat springs and helical springs that operate below 800°C and require high strength and relaxation resistance in aircraft engines. It is also suitable for producing turbine blades, bolts, and other components for gas turbines.

Material Properties

Inconel alloy X-750 is a nickel-based superalloy known for its remarkable oxidation resistance, corrosion resistance, and high strength characteristics. The alloy performs excellently in high-temperature environments, showing good corrosion and oxidation resistance below 980°C, high strength below 800°C, and good relaxation resistance below 540°C. Its material properties make it widely applicable in aerospace, nuclear energy, chemical processing, and oil and gas industries. For instance, it is used to manufacture flat springs and helical springs that operate below 800°C and require high strength and relaxation resistance, as well as for turbine blades, bolts, and other components.

Key Chemical Composition

The chemical composition of Inconel X-750 is as follows (by weight percentage):

- Nickel (Ni): ≥70.0%

- Chromium (Cr): 14.0% - 17.0%

- Iron (Fe): 5.0% - 9.0%

- Aluminum (Al): 0.4% - 1.0%

- Titanium (Ti): 2.25% - 2.75%

- Silicon (Si): ≤0.5%

- Manganese (Mn): ≤1.0%

This unique chemical composition ensures that Inconel X-750 retains good corrosion resistance and tensile strength at elevated temperatures.

Mechanical Properties

The mechanical properties of Inconel X-750 at various temperatures are as follows:

- Room Temperature Yield Strength: ≥380 MPa

- Room Temperature Tensile Strength: ≥620 MPa

- Elongation (Fracture): ≥30%

- High-Temperature Tensile Strength: Up to 700 MPa (at 800°C)

High-Temperature Performance Monitoring

According to standardized testing, the yield strength and tensile strength of this alloy maintain ideal levels in the temperature range of 700°C to 1000°C, ensuring safety and reliability under extreme working conditions.

Physical Properties

- Density: Approximately 8.28 g/cm³

- Melting Point: 1260°C - 1320°C

- Thermal Conductivity: 12.5 W/(m·K) (at room temperature)

- Specific Heat Capacity: 0.42 J/(g·K)

- Electrical Resistivity: 0.85 µΩ·m (at room temperature)

These physical properties provide the alloy with good thermal conductance and electrical performance under high-temperature conditions.

Key Features

Thermal Stability: Maintains mechanical performance and oxidation resistance during prolonged high-temperature operations.

Corrosion Resistance: Excellent resistance to acids and chlorides, suitable for a variety of corrosive environments.

Weldability: Compatible with multiple welding methods, ensuring strong and durable weld joints.

Function, Appearance, Dimensions, and Color

- Function: This product is mainly used to manufacture components for aircraft engines, gas turbine systems, and components within nuclear power facilities, capable of withstanding high temperatures, high pressures, and corrosive media.

- Appearance: The product is a silver-gray metallic bar with a smooth surface and no visible defects.

- Dimensions: Standard diameter ranges from 5 mm to 300 mm, with lengths customizable from 1 meter to 6 meters, meeting various application needs.

- Color: This product exhibits a metallic color, featuring good corrosion resistance and wear resistance.

Packaging Description

- Internal Packaging: High-quality moisture-proof materials are used to ensure that the product is protected from humidity during transportation and storage.

- External Packaging: Each alloy rod is packaged in reinforced wooden crates for easy storage and transportation.

- Labeling: Each package clearly indicates the product type, specifications, production batch number, and inspection certification to ensure traceability.

Product Applications

- Aerospace: Components for gas turbines, rocket engines, and related systems.

- Nuclear Energy: Pipelines and components for nuclear reactors.

- Chemical Processing: Reactors, pipelines, and heat exchangers, involving extreme corrosive environments.

- Oil and Gas: Wellhead equipment, valves, and other high-temperature devices.

Best-Selling Specifications and Market Demand

Our X-750 alloy bars with diameters of 25 mm, 55 mm, and 120 mm are very popular in the market. These sizes have broad applicability, particularly in the aerospace and petrochemical industries, making them common choices for our customers.

Advantages and Disadvantages

Advantages:

- Superior High-Temperature Strength: Compared to Inconel 600 and other common nickel-based alloys, X-750 has higher yield strength and tensile strength at elevated temperatures.

- Oxidation Resistance: Performs better in high-temperature oxidation environments, reducing the formation of oxide layers and extending service life.

- Formability and Weldability: Can be formed using various methods and exhibits good weldability.

Disadvantages:

- Higher Cost: The manufacturing process and raw material costs are higher, making it less economical for budget-constrained projects.

- Processing Difficulty: Requires specialized equipment and techniques for processing, increasing complexity.

User Experiences

Sophia K., R&D Director, Advanced Materials Group (Germany)***

"The performance of the PMI Inconel X-750 Bars from PMI in our sulfuric acid environments has been outstanding, with a pitting resistance equivalent to 40. Their durability has minimized our replacement frequency."