For designers of aero-engine discs, high-pressure steam valves, and reactor structural supports, the biggest challenge lies in time-related deformation. At temperatures exceeding 600°C, components don't fail immediately but instead "creep."
Challenges include: Dimensional failure: After thousands of hours of operation, components gradually stretch, leading to assembly interference and mechanical jamming.
Structural sagging: Load-bearing beams and bushings begin to warp, compromising the structural integrity of the entire system.
Premature stress fracture: Hidden microstructural changes can cause components to fracture suddenly and without warning.
Our high-performance GH4169 superalloy, designed for industrial durability, ensures your components maintain precise geometry even as standard alloys soften and fail.
Click to get Gnee Alloy's GH4169 performance information
GH4169 Industrial Durability Guide at 650°C
GH4169 Industrial Durability Guide at 650°C
GH4169 (equivalent to Inconel 718) is a precipitation-hardening nickel-based superalloy designed to maintain stability at temperatures up to 650°C (1200°F). Due to its high tensile strength, fatigue strength, and creep strength at this operating temperature, it is a standard material for aerospace turbine disks and engine structural components.
What is GH4169 equivalent to?
Inconel 718
GH4169 is a high-strength nickel-based superalloy primarily used in aerospace and high-temperature applications. It is equivalent to: Inconel 718 (USA) Alloy 718 (UNS N07718).
Stress fracture properties of GH4169
The secret to GH4169's superior performance lies in its stable γ′′ (γ bipolar) strengthening phase. This phase effectively pins grain boundaries, preventing atomic-level slip at high temperatures.
Typical stress fracture performance data of GH4169 (aerospace grade):
| Test Temperature (℃/°F) | Applied Stress (MPa) | Minimum Rupture Life (h) | Elongation at Rupture (%) |
| 650°C (1200°F) | 690 MPa | ≥ 100 Hours | ≥ 12% |
| 700°C (1292°F) | 450 MPa | ≥ 100 Hours | ≥ 15% |
| 760°C (1400°F) | 200 MPa | ≥ 25 Hours | ≥ 20% |
Click to download the GH4169 alloy PDF file now
Key Performance Indicators at 650°C
Yield Strength (0.2%): Maintains >850 MPa at 650°C, exhibiting superior resistance to deformation.
Operating Temperature Limits: Maximum continuous operating temperature is 650°C. Use above 700°C will lead to over-aging (strength decreases to <700 MPa) as the strengthening phase transforms into the δ(α) phase.
Creep Resistance: Ideal for long-term high-load applications due to niobium-based precipitates pinning grain boundaries.
Toughness: Maintains high toughness at low temperatures down to -253°C, demonstrating excellent versatility.
Fatigue Behavior at 650°C
Fatigue Life Optimization: Optimal fatigue life balance is achieved at 650°C when the surface microhardness is approximately 510 HV. At this temperature, higher hardness (> 530 HV) may accelerate crack propagation due to increased brittleness.
Failure Modes: In low-cycle fatigue (LCF), cracks form on or below the surface (40-80 μm) due to high strain. With proper surface hardening, failure sites in high-cycle fatigue (HCF) tend to extend deeper into the material (> 200 μm).
Creep-Fatigue Interaction: Creep-fatigue interaction studies indicate that high-temperature oxidation at 650°C induces surface cracks, thereby accelerating fatigue damage. Ensuring good surface finish (Ra S ≤ 0.4 μm) is crucial for achieving maximum fatigue life.
GH4169 Industrial Applications
As a Reliable Supplier to the global aerospace and nuclear sectors, we provide materials for:
Turbine Discs: Resisting massive centrifugal stress at 650°C.
High-Strength Springs: Maintaining tension over decades of thermal service.
Nuclear Structural Supports: Stable performance under radiation and heat.
Aero-engine Bolts: Preventing stress relaxation in safety-critical fasteners.
GH4169 Alloy 650°C Durability Summary Guide
| Factor | Recommendation |
|---|---|
| Max Continuous Use | 650°C (1200°F) |
| Short-term Max | 700°C (with significantly lower load) |
| Surface Treatment | Shot peening (enhances surface residual stress) |
| Failure Mechanism | δ Phase precipitation, oxidation + creep-fatigue |
| Key Property | High yield strength and creep resistance |
Why choose Tier 1 manufacturer Gnee Alloy?
✅️MTC 3.1 Traceability: Full heat analysis and stress-rupture logs provided for every batch.
✅️Data Stability: Our double-vacuum process ensures that batch #1 performs exactly like batch #100, crucial for FEA Simulation accuracy.
✅️Wholesale Pricing: Benefit from Direct Factory Price on both small-batch specimens and large-scale infrastructure orders.
✅️Global Fast Shipping: Optimized logistics to Europe, USA, and Southeast Asia.
Gnee Steel GH4169 Certificate
📦 Packaging and Shipping
All Nickel Based Alloy products are packaged using the following methods:
Wooden pallets or crates
Moisture-proof packaging
Labels with furnace number, standard, and size labels
Shipped worldwide by sea, air, or express
Gnee Steel GH4169 Product Packing
Contact us for the latest export price quote for GH4169 Alloy
FAQ
Q1: What happens to the stress-rupture life above 700°C?
A: Above 700°C, the strengthening γ′′ phase begins to dissolve into the stable but weaker δ phase. This is called "Over-aging," and it leads to a rapid drop in creep resistance. For environments above 700°C, we recommend considering GH4141 (Rene 41).
Q2: Does your material meet NACE MR0175 for sour gas creep service?
A: Yes. When heat-treated to specific hardness levels, our GH4169 is fully compliant with NACE MR0175, offering the high yield strength and corrosion stability required for downhole energy tools.
Q3: Is the elongation value important for creep?
A: Yes. High elongation at rupture (≥12%) indicates a "tough" failure mode. This means the material will deform slightly before snapping, giving your sensors time to detect the issue and prevent catastrophic system collapse.
Q4: Do you offer customized long-term creep testing (1000+ hours)?
A: For critical long-term projects, we can partner with independent labs to perform customized creep-rupture tests at your specific project parameters.
