What material is Inconel 718 high temperature alloy in China?
Inconel 718 high temperature alloy introduction:
Inconel 718 superalloy is a precipitation-reinforced nickel-based high-temperature and high-strength alloy
Inconel 718 has good comprehensive properties in the temperature range of -253~700℃, its yield strength below 650℃ ranks first among deformed high-temperature alloys, and it has good fatigue resistance, radiation resistance, and oxidation resistance. Corrosion resistance, good processability, welding performance and long-term structural stability can manufacture various parts with complex shapes. It has been widely used in the aerospace, nuclear and petroleum industries in the above temperature ranges.
Another feature of the alloy is that the structure of the alloy is particularly sensitive to the thermal processing process. The relationship between the precipitation and dissolution of phases in the alloy, as well as the relationship between structure, process and performance, can be grasped, and reasonable and feasible process flows can be tailored to different conditions. Formulations are required for use. A variety of parts are available that meet different strength levels and usage requirements.
Corresponding brands of Inconel 718 high temperature alloy at home and abroad:
China GB United States UNS Germany SEW VDIUV United Kingdom BS France AFNOR
Inconel 718 GH4169 N07718 W.Nr.2.4668NiCr19Fe19Nb5Mo3 NA 51 NC19FeNb
Inconel 718 high temperature alloy supply specifications:
Negotiated and supplied round steel, strips, strips, tubes, valve seats, balls, flanges and forgings
Inconel 718 high temperature alloy chemical composition:
Alloy C Mn Si P S Cr Ni Mo Cu Ti Al Fe Others
Inconel 718≤0.08≤0.35≤0.015≤0.35≤0.01517~21 50~55 2.8~3.3≤0.30.65~1.15 0.2~0.8 Margin Nb 4.75~5.5B≤0.006Co≤1
Physical properties of Inconel 718 high temperature alloy:
Density 8.2g/cm3
Melting point 1260-1340℃
Minimum mechanical properties of the alloy at room temperature:
Alloy Tensile Strength Rm N/mm2 Yield Strength RP0.2N/mm2 Elongation A5% Brinell Hardness HB
Solid solution treatment 965550 30≤363
Inconel 718 superalloy has the following characteristics:
1.Easy to process
2. High tensile strength, fatigue strength, creep strength and fracture strength at 700℃
3. High oxidation resistance at 1000℃
4. Has stable chemical properties at low temperatures
5.Good welding performance
Inconel 718 high temperature alloy metallographic structure:
Alloy 718 has an austenitic structure and the γ" phase formed after precipitation hardening has excellent mechanical properties. The δ phase formed at the grain boundaries during heat treatment gives it optimal plasticity.
Inconel 718 high temperature alloy corrosion resistance:
Alloy 718 has excellent resistance to stress corrosion cracking and pitting corrosion in high or low temperature environments. Alloy 718 has particularly excellent oxidation resistance at high temperatures.
Inconel 718 high temperature alloy process performance and requirements:
Thermal processing
The suitable heat treatment temperature is 1120-900℃, and the cooling method can be water quenching or other rapid cooling methods. After heat treatment, annealing should be carried out in time to ensure optimal performance. During thermal processing, the material should be heated to the upper limit of the processing temperature. In order to ensure plasticity during processing, the final processing temperature when deformation reaches 20% should not be lower than 960°C.
Cold working
Cold working should be carried out after solution treatment. The work hardening rate is greater than austenitic stainless steel, so the processing equipment should be adjusted accordingly, and an intermediate annealing process should be carried out during the cold working process.
Inconel 718 high temperature alloy welding process
The alloy has satisfactory welding properties and can be welded by argon arc welding, electron beam welding, seam welding, spot welding and other methods.
Heat treatment process of Inconel 718 high temperature alloy high temperature alloy parts
Heat treatment of aerospace parts is usually carried out according to standard heat treatment systems and direct aging heat treatment systems.
The application areas of Inconel 718 high temperature alloy are:
718 has high temperature strength of 700℃, excellent corrosion resistance and easy processing, so it can be widely used in various high-demand situations.
1.Steam turbine
2. Liquid fuel rocket
3.Cryogenic engineering
4.Acidic environment
5. Nuclear Engineering
