GH4169 round steel solid solution aging Inconel718 nickel-based
high temperature alloy forging ring customization
Inconel 718 alloy is a precipitation-hardened nickel-chromium-iron
alloy containing niobium and molybdenum. It has high strength at
700°C, good toughness and corrosion resistance in both high and low
temperature environments. It can be supplied in solution treated or
precipitation hardened state.
Chemical composition
alloy | % | Ni | Cr | Fe | Mo | Nb | C | Mn | Si | S | Cu | Al | Ti | B |
GH4169 | Minimum | 50 | 17 | margin | 2.8 | 4.75 | - | 0.20 | 0.65 | - |
maximum | 55 | 21 | 3.3 | 5.50 | 0.08 | 0.35 | 0.35 | 0.015 | 0.30 | 0.80 | 1.15 | 0.006 |
Physical properties of Inconel718 alloy
density | 8.24 g/cm3 |
Melting point | 1260-1320 ℃ |
Minimum mechanical properties of Inconel718 alloy at room
temperature:
alloy | Tensile strength Rm N/mm² | Yield strength Rp0.2 N/mm² | Elongation A5% | Brinell hardness HB |
Solution treatment | 965 | 550 | 30 | ≥363 |
Features and Benefits
High temperature strength: Inconel 718 can maintain good strength
and toughness at temperatures up to about 700°C, mainly due to its
internal stable γ' and γ'' phase structures.
Low temperature stability: The alloy can maintain its excellent
physical and mechanical properties even at very low temperatures.
Excellent welding and processing: It has good weldability and
processing, and can be welded and machined in various forms,
whether in the annealed or aged state.
Excellent corrosion resistance: It has good tolerance to a variety
of corrosive environments, including oxidizing, reducing and salt
spray environments.
Microstructure
Inconel 718 alloy is mainly composed of γ (austenite) matrix and
precipitated phases such as γ' (Ni₃(Al,Ti)), γ'' (Ni₃Nb) and δ
(Ni₃Nb). These precipitated phases play a strengthening role in the
alloy, giving it higher strength and hardness.
Manufacturing process
The manufacturing process of Inconel 718 alloy involves multiple
links such as smelting, forging, rolling, and heat treatment.
During smelting, the quality of raw materials and alloy composition
must be strictly controlled to ensure the purity and uniformity of
the alloy. During forging and rolling, the microstructure and
mechanical properties of the alloy can be optimized through
reasonable temperature and deformation. Heat treatment is a key
link in the manufacturing process. Through solution treatment and
aging treatment, the strength and hardness of the alloy can be
improved.
Application field
Inconel 718 alloy is widely used in the following fields due to its
excellent performance:
Aerospace: As a key component of aircraft engines and gas turbines,
such as turbine blades, turbine disks and rotors.
Energy: Various elastic elements used in reactor pressure vessels,
control rod drive mechanisms and nuclear fuel cycle systems in
nuclear power plants.
Chemical industry: In the petroleum and chemical industries, it is
used to manufacture various high-temperature and
corrosion-resistant equipment and pipelines.
Cryogenic engineering: Used in the manufacture of cryogenic storage
containers such as liquid nitrogen and liquid hydrogen.
Mold manufacturing: Used to manufacture high-temperature molds and
withstand high-temperature and high-pressure working environments.
