1. Definition and chemical composition of Inconel 686 alloy
Inconel 686 alloy is a nickel-based superalloy with extremely high corrosion resistance and high temperature resistance. It is an alloy containing up to 60% nickel, and other main elements include chromium, molybdenum, iron, cobalt, copper, titanium, aluminum, etc. The specific chemical composition is shown in the table below:
Element | Chemical composition (mass fraction/%)
—|—
Nickel | 58.0-63.0
Chrome | 19.0-23.0
Molybdenum | 8.0-10.0
Iron | 1.0-5.0
Cobalt | 1.0-5.0
Copper | 0.5-1.5
Titanium | 0.15-0.65
Aluminum | 0.05-0.5
2. Production standard of Inconel 686 alloy
The production standards of Inconel 686 alloy include ASTM B564, ASTM B564M, ASTM B462, ASTM B462M, etc. These standards stipulate the chemical composition, mechanical properties, corrosion resistance and other indicators of the alloy to ensure the quality and performance of the alloy.
3. Corrosion resistance of Inconel 686 alloy
Inconel 686 alloy has excellent corrosion resistance and can operate stably for a long time in harsh environments such as strong acid, strong alkali and salt water. It can resist the corrosion of sulfuric acid, nitric acid, hydrochloric acid, hydrofluoric acid, chloride and other corrosive media, especially in high temperature seawater containing chloride ions. The corrosion resistance of Inconel 686 alloy is formed by the synergistic effect of its high content of nickel and molybdenum elements and other alloying elements.
4. High temperature resistance of Inconel 686 alloy
Inconel 686 alloy has excellent high temperature resistance. It can run stably for a long time at high temperature, and has high strength, high toughness, good oxidation resistance and thermal fatigue resistance. In the high temperature environment below 1000 ℃, the mechanical properties and corrosion resistance of Inconel 686 alloy are very good.
5. Typical application range of Inconel 686 alloy
Inconel 686 alloy is widely used in chemical industry, petroleum, electric power, aerospace and other fields, especially in chemical industry. Due to its excellent corrosion resistance and high temperature resistance, Inconel 686 alloy is used in the manufacture of high temperature and high pressure equipment such as chemical equipment, petrochemical equipment, nuclear power equipment, aero engines, and gas turbines.
6. Thermal processing of Inconel 686 alloy
The hot working temperature range of Inconel 686 alloy is 1100℃～900℃. During thermal processing, attention should be paid to controlling the deformation amount and deformation speed to avoid grain coarsening and accumulation of deformation stress caused by excessive processing. Commonly used thermal processing methods include forging, rolling, extrusion, etc.
7. Cold working of Inconel 686 alloy
The cold working performance of Inconel 686 alloy is relatively poor, and the commonly used cold working methods include cold drawing, cold rolling and cold extrusion. During the cold working process, attention should be paid to the deformation amount and deformation speed of the material to avoid cracking and deformation of the material caused by excessive processing.
8. Heat treatment of Inconel 686 alloy
The heat treatment temperature range of Inconel 686 alloy is 1050 ° C to 1150 ° C, and the commonly used heat treatment methods include solution treatment and aging treatment. The solution treatment temperature is 1050°C-1150°C, the holding time is 1-4 hours, and then rapidly cooled to room temperature; the aging treatment temperature is 700°C-800°C, the holding time is 8-24 hours, and then air-cooled to room temperature. Heat treatment can improve the grain structure and mechanical properties of the alloy, and improve its creep resistance.
9. Machining of Inconel 686 alloy
The machinability of Inconel 686 alloy is average, because its material has high hardness and low plasticity, and it is easy to generate cutting heat and cutting force. Commonly used machining methods include turning, milling, drilling and cutting. During the machining process, appropriate cutting tools and cutting parameters should be selected to avoid deformation and cracking of the material caused by over-processing.
10. Welding of Inconel 686 alloy
Inconel 686 alloy has good welding performance, and commonly used welding methods include arc welding, TIG welding and MIG welding. During the welding process, care should be taken to select the appropriate welding material and welding process, control the welding temperature and welding speed, and avoid welding defects and cracks. Recommended welding materials include ERNiCrMo-10, ERNiCrMo-6, etc.
11. Material specific gravity and available product range of Inconel 686 alloy
The material specific gravity of Inconel 686 alloy is 8.94g/cm³, which is a high-density material. The Inconel 686 alloy products produced by Hunter Nickel Alloy Company include plates, pipes, bars, wires, forgings, castings, etc. The specifications and dimensions can be customized according to customer requirements.
In conclusion, Inconel 686 alloy is an excellent high-temperature, high-corrosion performance alloy material, which has broad application prospects. During use and processing, it is necessary to pay attention to control the processing parameters and heat treatment process to ensure the performance and quality of the material.
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Post time: Aug-26-2023
