GH4169高温合金

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Product information

Grade: GH4169
Steel Manufacturer: Haynes; SMC; ATI; VDM; Outokumpu; NYK; Jinri Tiefu, Fushun / Northeast Special Steel
GH4169 is a precipitation-hardened nickel-based high-temperature alloy that exhibits excellent comprehensive properties such as high strength, corrosion resistance, and fatigue resistance within the temperature range of -253°C to 650°C.
Core Performance Characteristics:
Temperature Range of Applicability. Long-term operating temperature range: -253°C to 650°C, can withstand short-term temperatures up to 800°C. 
Mechanical Properties:
Room Temperature Tensile Strength ≥ 1100 MPa, remains 800 MPa at 650°C. 
Yield Strength ranks first among deformation high-temperature alloys below 650°C. 
Special Properties:
Antioxidation: Optimizes the alloy's antioxidant properties through the addition of aluminum. 
Radiation Resistance: Suitable for radiation environments such as nuclear reactors. 
Fatigue Resistance: High-cycle fatigue strength at 650°C reaches 450 MPa. 
Physical and Chemical Properties:
Density 8.24 g/cm³, Thermal Expansion Coefficient (20-700°C) 13.2×10⁻⁶/°C to 14.5×10⁻⁶/°C. 
Chemical Composition: Based on nickel (50%-55%), contains chromium (17%-21%), niobium (4.75%-5.5%), etc. 
Processing Technology Characteristics:
Uses vacuum dual-melting process (VIM + VAR) to reduce impurity content. 
Standard Heat Treatment Process: 980°C solution treatment for 1 hour.
720°C aging for 8 hours.
620°C secondary aging for 8 hours. 
Supports additive manufacturing technology for the preparation of 10 μm grain structure components.

Product parameter

Chemical composition 
GH4169 is a nickel-based superalloy. Its standard chemical composition mainly includes nickel (50-55%), chromium (17-21%), iron (in excess), niobium (4.75-5.5%), molybdenum (2.8-3.3%), titanium (0.65-1.15%), and aluminum (0.2-0.8%) among other elements.
‌Main Chemical Components and Functions‌
As a precipitation hardening type nickel-chromium-iron alloy, the core components and functions of GH4169 are as follows:
‌Nickel (Ni): 50-55% - The base element, providing excellent mechanical properties and corrosion resistance foundation.‌
‌Chromium (Cr): 17-21% - Forms an oxide film, enhancing high-temperature oxidation resistance and corrosion resistance.‌
‌Niobium (Nb): 4.75-5.5% - Forms γ'' phase (Ni3Nb), the main strengthening phase, significantly enhancing fatigue resistance and creep resistance.‌
‌Molybdenum (Mo): 2.8-3.3% - Improves high-temperature strength and creep resistance, and strengthens corrosion resistance.‌
‌Titanium (Ti): 0.65-1.15% and Aluminum (Al): 0.2-0.8% - Together form γ' and γ'' precipitation phases, enhancing alloy strength through precipitation strengthening.‌
‌Iron (Fe): in excess - Adjusts alloy density and cost, improving processing performance.‌
‌Trace Additive Elements‌
Cobalt (Co) ≤ 1.0%, Boron (B) ≤ 0.006%, Manganese (Mn) ≤ 0.35%, Silicon (Si) ≤ 0.35%, etc., are used to optimize high-temperature performance or control impurity content.‌
‌Component Variants‌
According to application requirements, GH4169 may be divided into standard composition, high-quality composition (reducing carbon and increasing niobium to reduce fatigue sources), and high-purity composition to enhance comprehensive performance.

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