Introduction of electric heating wire:
The heating wire must have a suitable resistivity to achieve the purpose of heating. If the resistivity is too large or too small, a very short or very long, very thin or very thick heating wire is needed, so that it is difficult to manufacture and use electric heaters of large and small power; the melting point should be relatively high, and it will not melt if it heats up. When the temperature is high, the chemical stability is relatively high, and it cannot be oxidized quickly and has a short life.
When the voltage is constant, as the temperature increases, the resistance of the heating wire will increase, and the power will drop somewhat. When heat generation and heat dissipation reach a balance, the temperature is fixed. The power of the heating wire is determined by the material, the thickness and length of the heating wire. If it is the same material, the longer and thinner the heating wire, the greater the resistance and the lower the power. The working temperature of the heating wire is determined during the design of the electric heating product (the power of the heating wire is selected according to the area required by the product and the heat dissipation condition). If the use conditions are changed during use, it will cause problems with the heating wire or its products, so safe use must be followed.
The best choice for heating wire products:
Commonly used new energy electric heating materials can be divided into iron-chromium-aluminum alloy products, nickel-chromium alloy products and pure nickel wire products according to the material. These three products are widely used in its supporting equipment in the market. In recent years, customer requirements have become more and more stringent. It has become a trend to select advanced foreign heating wires to replace domestic heating wires and use them in equipment or products. Sweden imported heating wires (Kangtaiers) have been in the international market. Welcome, in our country, small and medium-sized enterprises are also beginning to replace the Swedish Kantell wire, and it is gradually accepted. The price is slightly higher than that of domestic heating wires, but in the long run, it is still a good choice.
Here to share with you: a comparison between domestic heating wire and imported heating wire in the application of high temperature resistance furnace:
1. Domestic heating wire: When the furnace temperature is 500-900 degrees, it is recommended to use 0cr25al5; when the furnace temperature is 900-1000 degrees, it is recommended to use 0cr21al6nb, nickel-chromium wire; when the furnace temperature is 1100-1200 degrees , It is recommended to use Ocr27al7mo2. For example, when the domestic wire is processed into an electric furnace bar, and its working temperature is lower than or equal to the suitable working temperature of the material, the surface load of the furnace wire can generally be 1.5-1.8W/cm2, which can extend the service life of the furnace wire. Give full play to the role of materials. When the working temperature is higher than the suitable working temperature of the material, it is recommended that the surface load of the furnace wire be 1.0-1.2W/cm2, which can slow down the aging of the furnace wire.
2. Sweden imported Kanthal heating wire: Since Kanthal alloy can be operated at a higher temperature, the higher surface load will not damage the life. For example, the ceramic tube Kanthal electric furnace wire, the wire diameter is about 3mm, when the working temperature is 1200 degrees, the surface load can be 2.5W/cm2; when the working temperature is 1150 degrees, the surface load can be 3W/cm2; when The lower the working temperature, the greater the surface load can be achieved.
It can be seen that the use of Kanthal electric stove bars saves materials and space more than domestic electric stove bars. When used for a long time, the cost is also lower.
The advantages of Swedish Kanthal heating wire:
1. The energy conversion efficiency of KANTHAL heating wire is higher than that of domestic heating wire. The maximum temperature is 1425℃2600 F, which is higher than the nickel-chromium alloy 1250℃2280 F.
2. KANTHAL heating wire and domestic heating wire are used under the same specifications, and the service life of imported heating wire is 4-8 times that of domestic heating wire.
3. KANTHAL heating wire has a high surface load.
4. KANTHAL heating wire has high resistivity.
5. Kanthal KANTHAL heating wire has a lower density and saves material costs.
6. No oxide debris will be produced. Oxides can contaminate goods and electric furnaces, and may cause short circuits or failures of electric heating elements and gas burners. For the use of electric furnaces, the use of NIKROTHAL (NIKROTHAL) results in lower operating costs, less material consumption, and longer life.
