Inconel 718 Nickel-Chromium-Iron Precipitation-Hardening Superalloy Seamless Tube

I. Performance Characteristics

1. High-Temperature Performance

1.1 Maintains stable mechanical properties from -253°C to 700°C, with a short-term service life limit of 982°C

1.2 Excellent creep resistance, due to the precipitation strengthening effect of the γ’ phase (Ni3Nb)

1.3 Ranks among the highest yield strength alloys below 650°C

2. Corrosion Resistance

2.1 Resists attack by acids, alkalis, salts, and media containing hydrogen sulfide and chlorides

2.2 Forms a dense Cr₂O₃ oxide film on the surface, with an oxidation resistance temperature of up to 800°C

3. Mechanical Properties

3.1 Tensile strength ≥1300 MPa, yield strength >1000 MPa

3.2 Combines high ductility (elongation ≥12%) with fatigue resistance

4. Processing Advantages

4.1 Excellent weldability, no tendency to crack after welding

4.2 Highly sensitive to heat treatment, requiring precise control of process parameters.

II. Main Applications

1. Aerospace

1.1 High-temperature components such as engine turbine discs, combustion chambers, and nozzles

1.2 Rocket engine casings and fuel delivery pipelines

2. Energy and Chemicals

2.1 Nuclear reactor structural materials and fuel element cladding

2.2 Oil well casing and corrosion-resistant valves in oil and gas production

3. Special Industrial Applications

3.1 High-temperature automotive turbocharger piping

3.2 Seawater-resistant hydraulic system piping for ships