GH4199高温合金

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Product information

Grade: GH4199
Steel Manufacturer: Haynes; SMC; ATI; VDM; Outokumpu; NYK; Jinri Railway, Fushun / Northeast Special Steel
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 main matrix 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'' precipitated 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., 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. 
GH4199 is a nickel-chromium based precipitation hardening type deformation high-temperature alloy, with a maximum operating temperature of up to 950℃. Its key performance characteristics are as follows: Mechanical properties
High-temperature strength: It can maintain a high strength even at 950℃, for example, the tensile strength is > 490 MPa (at 900℃). 
Creep resistance: It has a small deformation amount under long-term high-temperature conditions and is suitable for components subjected to complex stresses. 
Yield strength: Through aging treatment in the 600-800℃ range, the creep resistance can be significantly improved. 
Antioxidation and corrosion resistance
Antioxidation film: The high chromium content (19%-21%) forms a dense Cr₂O₃ protective film, effectively resisting high-temperature oxidation. 
Corrosion resistance: Suitable for environments with corrosive media such as petrochemical equipment. 
Processing and welding properties
Processing characteristics: Good plasticity in both cold and hot processing, but the number of forging and cold deformation times need to be controlled to avoid cracks. 
Welding properties: Supports welding assembly and is suitable for manufacturing complex structural components. 
Composition and strengthening mechanisms
Solid solution strengthening: Elements such as Cr, Mo, W enhance the matrix strength; 
Ageing strengthening: Al, Ti, Nb form γ' phase (Ni₃(Al,Ti)) and carbides, pinning dislocations; 
Grain boundary strengthening: Elements such as B, Mg, Ce purify grain boundaries and enhance creep resistance. 
This alloy is widely used in key components of aircraft engine combustion chambers, adjustable nozzle sleeves, etc.

Product parameter

Chemical composition 
GH4199 is a precipitation-hardening type nickel-chromium based deformation-resistant superalloy. Its chemical composition (mass fraction) is as follows:
‌Carbon (C): ≤ 0.10%, controlling the amount of carbides to balance the ductility of the matrix ‌
‌Silicon (Si): ≤ 0.55%, acting as a deoxidizer to improve the melting purity ‌
‌Manganese (Mn): ≤ 0.50%, assisting in desulfurization and deoxidation and refining the grains ‌
‌Phosphorus (P): ≤ 0.015%, avoiding embrittlement and maintaining high-temperature ductility ‌
‌Sulfur (S): ≤ 0.015%, reducing the tendency of hot brittleness and improving the welding performance ‌
‌Chromium (Cr): 19 - 21%, forming Cr₂O₃ protective film to resist oxidation ‌
‌Nickel (Ni): excess amount, stabilizing the austenite matrix and providing high-temperature toughness ‌
‌Molybdenum (Mo): 4 - 6%, solid solution strengthening and enhancing creep resistance ‌
‌Aluminum (Al): 2.1 - 2.6%, alloying with titanium to form γ' phase to strengthen the high-temperature properties ‌
‌Titanium (Ti): 1.1 - 1.6%, promoting the formation of γ' phase to enhance high-temperature endurance strength ‌
‌Titanium (Nb): 1.15 - 1.65%, forming NbC to strengthen the grain boundaries and prevent creep cracking ‌
‌Boron (B): ≤ 0.008%,微量 strengthening the grain boundaries and enhancing creep resistance ‌
‌Magnesium (Mg), Cerium (Ce): trace amounts, purifying inclusions to improve high-temperature fatigue performance ‌
Other elements such as Copper (Cu), Iron (Fe) also have specific content ranges

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