With the development of the foundry industry, the use of electric furnaces is becoming more and more widespread. Let's take a look at how the manufacturers of dry punching materials are introduced!

Coreless induction furnace is widely used because of its strong heating power, intermittent operation, energy saving and environmental protection, flexible and convenient use. In recent years, in newly installed induction furnaces, the proportion of intermediate frequency and frequency conversion furnaces is increasing, and high efficiency, fast melting and large scale have become the development direction of induction furnaces. The development of induction furnace is closely related to the technological progress of furnace lining refractories, and the quality of furnace lining refractories is an important factor that determines the life of induction furnace, casting quality and operation safety and reliability. At present, the production situation of furnace lining refractory materials is not optimistic, there are few research units, few professional manufacturers, low level, few varieties, single materials, most of them still stay in the traditional acid, medium and alkali levels, far behind the development of new forms, so furnace lining materials have been a big problem plaguing the majority of users. In the 1990s, our factory successively launched intermediate frequency charges such as acid lining materials and neutral dry punching materials, which solved the problem of short furnace life in the process of smelting high-manganese steel, alloy steel, stainless steel and nickel-chromium alloy in small-capacity intermediate frequency furnace. However, in recent years, there is still no ideal lining material for the newly installed medium and large frequency furnaces in China. According to the investigation, a special steel factory bought an intermediate frequency furnace, the use of domestic acidic quartz dry ramming material, ironmaking can only be used about 30 times. When smelting special steel, the furnace lining erosion is serious, can only melt a few furnaces, more than a dozen furnaces, but also have to organize the furnace team dedicated to constantly play the furnace, wasting manpower, material resources, and consuming a lot of funds. In response to the above problems, under the guidance of Luoyang Refractory Research Institute, our scientific researchers have reviewed a large number of relevant information at home and abroad, and developed a neutral dry ramming material for smelting special steel to solve the current problems of furnace lining materials.

       The lining material used in induction furnace can be divided into dry ramming material and wet ramming material according to the construction method. In recent years, most manufacturers have adopted integral construction and dry ramming. Only the small volume furnace melting low melting point metal is wet rammed, adding appropriate amount of water and bonding agent to the charge as a whole ramming construction. Compared with wet ramming materials, dry ramming materials have obvious advantages.

       Characteristics and advantages of dry ramming lining

The above pictures are provided by the manufacturer of dry beating materials

       In recent years, due to the high energy saving of medium-frequency frequency induction furnaces, frequency conversion furnaces and medium-frequency furnaces have accounted for a considerable proportion in newly installed induction furnaces. The selection of lining materials is particularly important, and the lining materials used in special steel must have excellent high temperature resistance, corrosion resistance, no cracks on the hot surface, no leakage and other characteristics to avoid accidents. We consult a lot of data at home and abroad, under the guidance of scientific research, choose fused corundum as the main raw material, the particle material adopts multi-stage gradation, the appropriate addition of fused spinel powder and high-performance anhydrous binder, the dry material preparation, and stir evenly, special double-layer packaging. Users can directly build the furnace without stirring to meet the current market demand. The performance comparison of several dry ramming materials is now a comprehensive analysis and comparison of several dry ramming materials used in the market for cast steel and special steel and our dry ramming materials, as shown in Table +.

The above information is provided by Hubei Anaijie dry punching material manufacturer

       As can be seen from the comprehensive analysis table:

1, acid quartz lining material, its refractoriness is low, can only melt cast iron and ordinary carbon steel.

2. Magnesia lining material has high melting point, high softening temperature under load and strong corrosion resistance to alkaline melt. However, its thermal expansion series number is large, sintering temperature is high, due to its expansion and contraction in the operation, the lining is easy to produce cracking and spalling, there are defects such as hanging slag, material moisture failure, etc., can only be used for low-capacity furnaces below 3 tons.

3, magnesia spinel lining material is electric fused magnesia as the main raw material, with the advantages of magnesium oxide, high melting point, high refractoriness and load softening temperature, strong corrosion resistance, hot surface is not easy to crack, leakage, only suitable for about 10 furnace use.

4, alumina spinel lining material, mainly fused corundum, with an appropriate amount of spinel. Compared with brucite and spinel, corundum has a small coefficient of thermal expansion, and the volume expansion generated by secondary spinel during use can effectively inhibit the cracking of the furnace lining, reduce micro-cracks, and have a long service life. Most manufacturers use imported materials, which are expensive and difficult to popularize. Anai Jie furnace lining material, has obvious advantages, it is mainly fused fused corundum, plus an appropriate amount of fused spinel, small impurities, high purity, has excellent slag resistance and corrosion resistance, fused corundum thermal expansion coefficient is small, hot volume stability is good, furnace lining hot surface cracking is significantly suppressed, micro-cracking is significantly reduced, high temperature, long furnace age, anti-seepage crack, and so on. At present, it is being promoted and applied in medium-sized induction furnaces for smelting special steels such as stainless steel with high melting point in large and medium-sized furnaces.

       Specifically, the effect of using) dry ramming materials is mainly reflected in the following aspects:

1, reduce the mixing process of ingredients; Compared with dry quartz lining material, no phase change occurs in the process of oven sintering, which can save baking and sintering time.

2, low burning loss, less slag, less loss of alloy elements in the melting process, stable quality of liquid metal; Overcome the shortcomings of lining such as cracks, hanging slag, moisture failure, low operating temperature, short life of lining and so on, and obviously improve the service life of lining;

3, anti-seepage crack, improve safety; Can replace expensive imported materials, whose price is only imported materials; Reduce the construction times, significantly reduce manpower, materials, energy, capital consumption and direct production costs, and significantly improve economic benefits.

In short, Anaijie dry ramming material is the current large and medium-sized coreless induction furnace smelting special steel more ideal lining material, its promotion and application will open up a new way for the large capacity medium frequency, frequency conversion furnace smelting high melting point stainless steel, special steel vigorously application and promotion.

The above information is provided by the manufacturer of dry punching materials! Welcome to telephone consultation!