For engineers designing heat shields for aero-engines, high-pressure valves, or internal components of industrial furnaces, a major challenge lies in the mismatch of their coefficients of thermal expansion. When different materials expand at different rates during rapid heating (up to 700°C), the following problems can occur:
Component seizure: Moving parts may seize due to unexpected expansion.
Loss of structural integrity: Extremely high internal stresses can lead to localized buckling or "warping."
Fatigue cracking: Repeated thermal cycling can cause premature fracture at joints.
Understanding the properties of GH4169 sheet metal is crucial to overcoming these challenges. GH4169 (comparable in performance to Inconel 718) is favored for its balanced coefficient of expansion and high thermal stability, ensuring structural stability and zero deformation even in the most demanding high-temperature environments.
Guide to the physical and thermal properties of GH4169 (Inconel 718) sheet
Guide to the physical and thermal properties of GH4169 (Inconel 718) sheet
GH4169 (equivalent to Inconel 718) is a precipitation-hardening nickel-chromium-iron-based superalloy sheet material with excellent strength, oxidation resistance, and corrosion resistance, making it particularly suitable for high-temperature environments. Due to its excellent weldability and machinability, GH4169 is often used in sheet form for aerospace components such as housings, gaskets, and molded heat shields.
What are the properties of Inconel 718?
Properties of Inconel 718
Inconel 718 is a nickel-based superalloy ideal for applications requiring high strength over a temperature range from low temperatures to 1400°F (760°C). Inconel 718 also exhibits excellent tensile and impact strength.
1.Physical Properties of GH4169 Sheet
| Physical Property | Value |
|---|---|
| Density | Approximately 8.24 g/cm³ (0.297 lb/in³) |
| Melting Range | 1260°C – 1336°C (2300°F – 2437°F) |
| Magnetic Permeability | Non-magnetic |
| Elastic Modulus | 200 GPa (29.0 × 10³ ksi) |
| Structure | Austenitic structure, strengthened by precipitating γ' and γ'' phases |
2. Thermal Properties of GH4169 Sheet
GH4169 maintains high performance at temperatures up to 650°C (1200°F) and can operate stably for a long time; its short-term temperature resistance is up to 800°C and its oxidation resistance is up to 1000°C.
| Thermal Property | Value |
|---|---|
| Specific Heat Capacity | Approximately 435 J/(kg·K) at 20°C (0.104 BTU/lb·°F) |
| Thermal Conductivity | 11.4 W/(m·K) at 70°F (increases with temperature) |
Mean Coefficient of Thermal Expansion (CTE):
| Temperature Range | CTE (μm/m·K) |
|---|---|
| 20°C to 100°C | ~ 13.0 |
| 20°C to 600°C | ~ 15.0 |
3. Mechanical Properties of GH4169 Sheet
| Mechanical Property | Solution Treated | Aged |
|---|---|---|
| Ultimate Tensile Strength (Room Temp) | ≥ 965 MPa | ≥ 1275 MPa |
| Yield Strength (Room Temp) | ≥ 550 MPa | ≥ 1034 MPa |
| Elongation | ≥ 30% | ≥ 12% |
Click to download the GH4169 alloy PDF file now
Why Source GH4169 Plates from Gnee Steel?
✅️Wholesale Pricing: Secure Direct Factory Pricing on high-purity aerospace-grade materials.
✅️Precision Tolerances: We provide cold-rolled sheets with thickness tolerances as tight as ±0.02mm, ensuring your thermal calculations match the actual part weight.
✅️MTC 3.1 Traceability: Every order includes a full EN 10204 3.1 Certificate documenting physical and mechanical properties.
✅️Custom Cutting: We offer precision laser and waterjet Cut-to-Size services to deliver ready-to-install thermal baffles and liners.
Contact us now to get the latest export price for GH4169 in 2026
FAQ
Q1: How do I prevent my GH4169 parts from seizing against 316L parts?
A: Since GH4169 has a lower thermal expansion coefficient than 316L (approx. 16 vs 18), you must design clearances based on the higher expansion rate of the 316L side to prevent jamming at 600°C.
Q2: Does the aging process change the physical properties?
A: The change in density and expansion is negligible (less than 0.1%). However, the mechanical strength increases drastically after aging, which is the key to maintaining Structural Integrity under load.
Q3: Can GH4169 handle rapid "Thermal Shock"?
A: Yes. GH4169 is specifically engineered for aerospace turbine environments where rapid heating and cooling are common. Its refined grain structure (ASTM E112 Level 8 or finer) provides superior resistance to thermal fatigue.
Q4: Do you offer trial samples for laboratory thermal expansion testing?
A: Absolutely. We support R&D projects and can provide precision-cut material coupons for your internal verification.
