1. Definition of Incoloy 825 alloy
Incoloy 825 alloy is a nickel-chromium-iron alloy with excellent corrosion resistance and high temperature strength. Its main components are nickel, chromium, iron, molybdenum and copper, and it also contains a certain amount of titanium, aluminum and other elements.
Second, the chemical composition of Incoloy 825 alloy
The chemical composition of Incoloy 825 alloy is shown in the table below:
| Composition | Content (%) |
| ——— | ——– |
| Nickel | 38.0-46.0 |
| Chromium | 19.5-23.5 |
| Iron | 22.0-26.0 |
| Copper | 1.5-3.0 |
| Molybdenum | 2.5-3.5 |
| Titanium | 0.6-1.2 |
| Aluminum | 0.2-0.8 |
| Carbon | ≤0.05 |
| Manganese | ≤1.0 |
| phosphorus | ≤0.02 |
| sulfur | ≤0.03 |
3. Production standard of Incoloy 825 alloy
There are many production standards for Incoloy 825 alloy, the common ones are ASTM B423, ASTM B424, ASTM B163, ASTM B704, ASTM B705, etc. These standards specify the chemical composition, mechanical properties, corrosion resistance, heat treatment and other requirements of Incoloy 825 alloy.
4. Corrosion resistance of Incoloy 825 alloy
Incoloy 825 alloy has excellent corrosion resistance and can be used in a variety of corrosive media for a long time. Its corrosion resistance at high temperature is particularly outstanding, and it can withstand the corrosion of various acids, alkalis, salts and other media. Specifically, Incoloy 825 alloy has good corrosion resistance in the following media:
1. Oxidizing acid corrosion medium: such as nitric acid, sulfuric acid, phosphoric acid, etc.
2. Reducing acid corrosion medium: such as hydrochloric acid, hydrofluoric acid, etc.
3. Alkaline corrosion medium: such as potassium hydroxide, sodium hydroxide, etc.
4. Chloride medium: such as sodium chloride, ammonium chloride, etc.
5. Nitrate medium: such as potassium nitrate, ammonium nitrate, etc.
5. High temperature resistance of Incoloy 825 alloy
Incoloy 825 alloy has good high temperature resistance and can maintain high strength and toughness at high temperatures. Its high temperature performance is mainly manifested in the following aspects
1. High temperature strength: Incoloy 825 alloy has high tensile strength and yield strength at high temperature, and can withstand the load at high temperature.
2. Creep resistance: Incoloy 825 alloy can also maintain good creep resistance at high temperatures, and is not prone to deformation and fracture.
3. Oxidation resistance: Incoloy 825 alloy is not easy to oxidize at high temperature, and can maintain good surface state and performance.
4. Thermal fatigue performance: Incoloy 825 alloy can maintain good thermal fatigue performance at high temperature, and fatigue cracks and fractures are not easy to appear.
6. Typical application range of Incoloy 825 alloy
Incoloy 825 alloy is widely used in chemical industry, marine engineering, petrochemical industry, nuclear industry, aerospace and other fields. Specifically, it can be used to manufacture chemical reactors, heat exchangers, pipes, valves, pump bodies, shipbuilding, offshore platform equipment, nuclear power plant equipment, aero-engine parts, etc.
7. Hot working, cold working, heat treatment, machining and welding of Incoloy 825 alloy
1. Thermal processing: The thermal processing temperature of Incoloy 825 alloy is generally between 980°C and 1180°C, and thermal processing methods such as forging, extrusion, and rolling can be used.
2. Cold working: The cold working of Incoloy 825 alloy is relatively difficult, and it is generally carried out by cold drawing, cold drawing, cold rolling and other methods.
3. Heat treatment: Incoloy 825 alloy can be subjected to various heat treatments, such as solution treatment, aging treatment, annealing treatment, etc., to adjust the properties of the alloy.
4. Machining: Machining of Incoloy 825 alloy is relatively difficult, and tools such as high-speed cutting and carbide tools are required, and attention should be paid to the cooling and lubrication of the tools.
5. Welding: Incoloy 825 alloy can adopt various welding methods, such as TIG welding, MIG welding, arc welding, plasma welding, etc. At the same time, it is necessary to pay attention to the selection of appropriate welding materials and welding parameters to ensure welding quality.
8. Recommended welding materials
Tungsten argon arc welding (TIG) is one of the commonly used welding methods for Incoloy 825 alloy. It is recommended to use ERNiCrMo-3 welding wire for TIG welding. In addition, when used at high temperature, it is also necessary to select a suitable filling material and cladding layer material.
9. Material specific gravity of Incoloy 825 alloy
The material specific gravity of Incoloy 825 alloy is about 8.14.
10. Incoloy 825 alloy product range available
Hunter Nickel Alloy Co., Ltd. can produce Incoloy 825 alloy products in various specifications and shapes, including plates, pipes, bars, wires, special-shaped parts, etc. The common specifications are as follows:
1. Incoloy 825 sheet: thickness 0.5mm-50mm, width 1000mm-2000mm, length 2000mm-6000mm.
2. Incoloy 825 pipe: outer diameter 6mm-219mm, wall thickness 0.5mm-20mm, length 1000mm-10000mm.
3. Incoloy 825 bar: diameter 5mm-500mm, length 1000mm-6000mm.
4. Incoloy 825 wire: diameter 0.5mm-10mm, length 1000mm-2000mm.
5. Incoloy 825 special-shaped parts: customized production according to customer needs.
In short, Incoloy 825 alloy has excellent corrosion resistance and high temperature strength, and can be widely used in chemical industry, marine engineering, petrochemical industry, nuclear industry, aerospace and other fields. When using Incoloy 825 alloy, it is necessary to pay attention to its characteristics of hot working, cold working, heat treatment, machining, welding, etc., so as to ensure the processing quality and product performance.
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Post time: Aug-26-2023
