For engineers in aerospace propulsion and precision stamping, rapid work hardening is a major pain point. The cold forming difficulty of GH4169 alloy is well-known. Without the right process, you'll face the following problems:
Edge cracking: Premature failure during deep drawing due to excessive strain.
Adhesion: Material tears and adheres to expensive dies.
Springback: Inconsistent dimensional accuracy after forming.
At Gnee Steel, we solve these problems at their source. Our GH4169 alloy sheets combine exceptional strength and ductility, ensuring success in deep drawing and spinning for your most complex aerospace components.
Contact our professionals to recommend the right alloy for your project
Performance Guidelines for Cold-Rolled GH4169 Alloy Sheets
Performance Guidelines for Cold-Rolled GH4169 Alloy Sheets
Cold-rolled GH4169 alloy sheet (modified IN718) is a high-strength nickel-based superalloy designed for demanding applications such as aerospace and nuclear engineering, exhibiting excellent performance over a temperature range from low temperatures to 650°C. Cold rolling (followed by solution treatment) enhances strength by refining the grain size and controlling α-phase precipitation.
What is the composition of GH4169 alloy?
The chemical composition of GH4169 alloy was as follows: Ni 53.44, Cr 18.56, Mo 3.02, Nb 5.3, Al 0.44, Ti 1.04, C 0.026, P 0.005, S 0.001, B 0.002 and Fe bal (wt. %).
1. Chemical composition of GH4169 plate
|
ERAUM |
% |
Ni |
Cr |
Fe |
Mo |
Nb |
Co |
C |
Mn |
Si |
S |
Cu |
Al |
Ti |
P |
B |
|
GH4169 |
MIN |
50 |
17 |
balance |
2.8 |
4.75 |
- |
- |
- |
- |
- |
- |
0.2 |
0.65 |
- |
- |
|
MAX |
55 |
21 |
balance |
3.3 |
5.5 |
1 |
0.08 |
0.35 |
0.35 |
0.015 |
0.3 |
0.8 |
1.15 |
0.015 |
0.06 |
2. Mechanical properties of GH4169 sheet for forming (solution treated state)
| Property | Value (Typical) | Benefit for Fabrication |
| Tensile Strength (σb) | 850 - 950 MPa | Predictable press force requirements. |
| Yield Strength (σp0.2) | 400 - 500 MPa | Allows for initial deformation without high stress. |
| Elongation (δ5) | ≥ 35% (up to 45%) | Prevents cracking during high draw ratios. |
| Hardness (HB) | ≤ 200 | Minimizes tool wear and die damage. |
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3. Performance Guidelines for Cold-Rolled GH4169 Alloy Sheets
Strength Evolution (Cold Rolled Condition):
Yield strength (YS) and ultimate tensile strength (UTS) increase consistently with higher cold rolling reductions, driven by dislocation density, work hardening, and the formation of deformation bands.
Optimal performance (after solution treatment):
Solution treatment after cold rolling (e.g., 980°C/1h) brings the material to its optimal performance. Yield strength (YS) and tensile strength (UTS) typically improve with reductions of up to 30% in reduction, but as reduction increases to higher levels (e.g., >50%-70%), yield strength and tensile strength may begin to decline due to excessive α-phase precipitation and softening effects.
Effect of Reduction Ratio (after 980°C/1h Solution):
30% Reduction:
Produces needle-shaped &-phase that provides pinning atgrain boundaries, yielding optimal tensile expansion and high strength.
50%-70% Reduction:
Promotes massive &-phase precipitation and substantialstatic recrystallization (grain refinement).
Overview of Mechanical Properties of GH4169 Sheet Metal (Typical Range):
Yield Strength (0.2%):
Increases from approximately 379 MPa (undeformed) to over 620 MPa (30% compression + solution treatment).
Tensive Strength (UTS):
Increases from approximately 858 MPa (undeformed) to over 1130 MPa (30% compression + solution treatment).
Influence of β Phase:
The volume fraction of the α phase (ideally approximately 3-4% after processing) can be adjusted to balance strength and ductility. Excessive precipitation (>7%) will lead to a decrease in strength.
Optimal heat treatment parameters for GH4169 high-temperature alloy plates:
Solution treatment:
970℃-1030℃, holding for 1 hour. A temperature of approximately 990℃-1030℃ is typically preferred for optimal ductility.
Aging treatment:
Typically 720℃/8 hours + 620℃/8 hours (furnace cooling) to maximize precipitation strengthening.
Contact us to customize the GH4169 alloy to your project needs
3. Why choose Gnee Steel as a reliable supplier of high-temperature alloys?
As a Tier-1 Manufacturer, we understand that for the Russian and CIS markets (UEC, Rosatom compliance), traceability and consistency are non-negotiable.
✅️VIM + VAR Purity: Ensures no "freckles" or inclusions that could act as crack initiators during spinning.
✅️Global Fast Shipping: Optimized logistics to major industrial hubs, including specialized export documentation.
✅️MTC 3.1 Traceability: Every sheet is delivered with heat numbers and grain-size verification (ASTM E112 Level 8 or finer).
✅️Wholesale Pricing: Competitive rates for bulk procurement in the energy and aviation sectors.
Gnee Steel GH4169(inconel 718) Certificate
Contact us for the latest export price quote for GH4169 Alloy
FAQ
Q1: Why are my sheets cracking at the edges during power spinning?
A: This is usually due to "strain saturation." If the material exceeds its work-hardening limit without an intermediate anneal, micro-cracks form at the high-stress edges. Ensure you are using material with ≥35% elongation and check your reduction ratios.
Q2: Can I weld GH4169 after cold forming?
A: Yes, but we recommend a solution anneal before welding to eliminate the residual stresses from the forming process. This prevents "strain-age cracking" during the welding thermal cycle.
Q3: Is GH4169 equivalent to Inconel 718 for deep drawing?
A: Absolutely. GH4169 is chemically and mechanically identical to Inconel 718. Our material is globally interchangeable and meets AMS 5596 standards.
Q4: Do you offer custom cut-to-size blanks for stamping?
A: Yes. We offer precision laser and waterjet cutting to provide ready-to-form blanks, saving you material waste and pre-processing time.
