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Introduction
GH4090 (NIMONIC90) is a nickel-based high-temperature alloy, originally developed as the British brand Nimonic90. This precipitation hardening superalloy offers high tensile strength, excellent creep resistance, good oxidation resistance, and strong reverse fatigue strength. GH4090 round bar, sheet, strip, wire, forging, and seamless tube are widely used in turbine discs, turbine blades, high-temperature turbines, sealing rings, and fasteners for aerospace engines. GH4090 alloy spring wire is a cold-processed high-strength product specifically used for manufacturing springs in aviation components. As a Chinese superalloy (GB/T standard), GH4090 is a reliable alternative to Waspaloy for demanding high-temperature applications.
Chemical components（%）
Composition | C | Si | Mn | P | S | Cr | Ni | Co | Al | Cu | Fe |
Min | \ | \ | \ | \ | \ | 18.00 | 6.5 | 15.00 | 1.00 | \ | \ |
Max | 0.13 | 0.80 | 0.40 | 0.02 | 0.015 | 21.00 | 7.75 | 21.00 | 2.00 | 0.20 | 1.50 |
Mechanical properties
Rigidity | Tensile strength | Yield strength | Elongation |
280HBS | ≥820MPa | ≥590MPa | ≥8% |
Physical properties
Density | Melting points | Specific heat | Magnetism | Resistivity | Thermal conductivity | Linear expansivity |
8.18g/cm3 | 1310-13700℃ | 543J/(Kg.℃） | \ | 1.34Ω·mm²/m(20℃) | 21.76W/(m.k)(100℃) | 12.71×10-6/K(20-100℃) |
GH4090 Nickel-Based Alloy Available Products and Standard
1. GB/T 14992 Superalloys – (Classification and Specifications)
Type: Round Bar / Sheet / Strip / Wire / Tube / Forgings
Size Range:
Wire: 0.1 – 15.0 mm dia
Strip: 0.05 – 5.0 mm thick × 5 – 500 mm wide
Round Bar: 8 – 355 mm dia
Sheet: 0.5 – 180 mm thick
Tube: Custom sizes available
Surface: Annealed, Bright, Pickled, Ground
Testing: Chemical analysis, mechanical test (tensile strength, yield strength, elongation), hardness test, high-temperature stress rupture test, dimensional inspection
2. ASTM B637 (Standard Specification for Precipitation Hardening Nickel Alloy Bar, Rod, and Forging)
Grade: GH4090 / Nimonic90 / Precipitation Hardening Nickel Alloy
Type: Round Bar / Rod / Forging
Size Range:
Round Bar: 8 – 355 mm dia (hot rolled or cold drawn)
Forging: Custom sizes available
Surface: Annealed, Pickled, Ground, Turned
Testing: Chemical analysis, mechanical test (tensile, yield, elongation), hardness test, stress rupture test, ultrasonic test, dimensional inspection
3. ASTM B906 (Standard Specification for General Requirements for Nickel Alloy Plate, Sheet, and Strip)
Grade: GH4090 / Nimonic90
Type: Sheet / Plate / Strip
Size Range:
Sheet / Plate: 0.5 – 180 mm thick (hot rolled or cold rolled)
Strip: 0.05 – 5.0 mm thick × up to 500 mm wide (coils)
Surface: Annealed, Pickled, Bright, Polished
Testing: Chemical analysis, mechanical test (tensile, yield, elongation), hardness test, dimensional inspection
4. AMS 5829 (Nickel Alloy, Corrosion and Heat Resistant, Spring Wire)
Grade: GH4090 / Nimonic90
Type: Spring Wire / Cold Processed Wire
Size Range: Spring Wire: 0.1 – 8.0 mm dia (coils)
Surface: Annealed, Bright, Cold Drawn
Testing: Chemical analysis, mechanical test (tensile, yield, elongation), hardness test, spring test, dimensional inspection
Advantages
(1)High temperature strength: GH4090 round bar and forging maintain high tensile strength and creep resistance up to 950°C, ideal for turbine discs and blades.
(2)Excellent oxidation resistance: GH4090 sheet and strip resist oxidation and thermal fatigue in high-temperature turbine environments.
(3)Strong reverse fatigue strength: GH4090 spring wire is cold-processed to deliver high fatigue resistance, specifically for aviation spring components.
(4)Age-hardenable: As a precipitation hardening superalloy, GH4090 achieves enhanced mechanical properties through heat treatment, comparable to Waspaloy.
(5)Versatile product forms: GH4090 seamless tube, wire, fasteners, and rings are available for various aerospace and industrial gas turbine applications.
Applications
(1)Aerospace turbine components: GH4090 round bar and forging are used for turbine discs, turbine blades, and sealing rings in jet engines.
(2)Aviation springs: GH4090 spring wire is specially designed for high-strength springs in aircraft engine controls and landing gear systems.
(3)High-temperature turbines: GH4090 sheet and strip are applied in turbine casings, combustor liners, and afterburner parts.
(4)Fasteners and rings: GH4090 bolts, nuts, and rings serve in critical high-stress, high-temperature assemblies.
(5)Industrial gas turbines: GH4090 seamless tube and wire are used in power generation turbine components requiring creep and oxidation resistance.
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