Inconel 738LC（ВЖЛ738）K438
Inconel 738LC is a nickel-based casting superalloy master alloy designed for precision investment casting of high-temperature turbine components. The alloy combines excellent creep rupture strength, oxidation resistance, and hot corrosion resistance, making it suitable for long-term service in severe thermal environments.
As one of the most widely used equiaxed casting superalloys, Inconel 738LC is commonly utilized in the production of gas turbine blades, nozzle guide vanes, combustion system components, and other critical hot-section parts. Vacuum melting technology ensures stable alloy chemistry, superior cleanliness, and reliable casting performance.
| Ni | Cr | Co | W | Mo | Ti | Al | Ta | Nb | C | B | Zr |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Balance | 15.7-16.3 | 8.0-9.0 | 2.4-2.8 | 1.5-2.0 | 3.2-3.7 | 3.2-3.7 | 1.5-2.0 | 0.7-1.2 | 0.08-0.13 | 0.005-0.015 | 0.03-0.08 |
| Tensile Strength | Yield Strength | Elongation |
|---|---|---|
| ≥ 900 MPa | ≥ 700 MPa | ≥ 5% |
Typical high-temperature performance:
Inconel 738LC exhibits excellent resistance to oxidation and hot corrosion in high-temperature environments. The chromium-rich oxide layer provides effective protection against oxidation, while the alloy's optimized chemistry enhances resistance to sulfidation and combustion-related corrosion.
These properties make the alloy particularly suitable for gas turbine and aerospace applications operating under severe thermal conditions.
Typical heat treatment practices include:
Solution Treatment:
Aging Treatment:
Heat treatment parameters may vary depending on casting geometry and customer specifications.
The alloy should be heated uniformly before thermal processing to minimize thermal stresses and distortion.
Surface cleaning after casting may include:
Mechanical Cleaning
Shot Blasting
Chemical Pickling
Surface Grinding
depending on component requirements.
As a casting superalloy, Inconel 738LC is primarily intended for investment casting applications rather than conventional wrought forming operations.
Complex geometries can be produced directly through precision casting processes, minimizing the need for extensive secondary forming.
Inconel 738LC can be machined using carbide tooling and appropriate cutting parameters.
Due to its high strength and work-hardening tendency, low cutting speeds and adequate cooling are recommended for achieving optimal machining performance.
Welding is generally limited for critical high-temperature turbine components.
Where required, specialized welding procedures and filler materials should be selected to minimize cracking and maintain mechanical properties.
Post-weld heat treatment may be necessary depending on application requirements.
Ronsco can supply Inconel 738LC in:
Production Routes:
VIM
VIM + ESR
Customized Melting Solutions
25th floor, C3 Building, Wanda Plaza, Kaifu District, Changsha, Hunan Province, China
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