Applied to the performance of the plastic furnace in the heating furnace top furnace is a thermal equipment to heat the billet to the required rolling temperature, the temperature of the heating is not the same, the heating furnace can generally be divided into preheating sections, heating In the section and soaking section, the temperature in the soaking section is the highest, the temperature in the preheating section is the lowest, the temperature in the preheating section is generally 700-900e, the temperature in the soaking section is 1200-1400e, and the heating furnace is not a continuous thermal equipment. It is an auxiliary equipment for the rolling mill service. Its working cycle is restricted by the steel rolling equipment, and the furnace temperature changes greatly. This requires the refractory material to have a high refractoriness and a good resistance to temperature changes. In the preheating section and heating section of the heating furnace, since the temperature of the furnace is not very high, especially in the preheating section, the feeding furnace door is often opened, cold air and cold billets will cause great fluctuations in the furnace temperature at the location, so this place The performance of plastics can not be used for refractoriness, but it can be used for plastics that are resistant to sudden cooling and rapid heating. Therefore, clays should be used for plastics. Taking the heating furnace as an example, if the preheating section is used until the middle of heating, clay-based fire-resistant plastics can be used. The plastics can be used at a temperature of 1300-1400e, which can fully meet the temperature requirements, and the price is high. Plastics 2/3-1/2. Take the heating furnace as an example. The FAB-type fire-resistant plastics produced by Dalian Paige are used here. The plastic 1 is mixed with high-aluminum aggregates and clay admixtures. Made of, the most important feature of this material is that it can withstand the direct impact of the flame and strong heat radiation, has a high degree of refractoriness, refractoriness up to 1770e, is not afraid of severe changes in temperature, good peeling resistance. In addition, fire-resistant plastic is a pneumatic tool. The malleable plastic material must have good plastic properties, and must have a certain degree of primary attachment strength, that is, the strength of demoulding. Application of fire-resistant plastics to the top of the heating furnace should be noted that different types of plastic can be used in different areas of the furnace top As mentioned earlier, the temperature gradient of the heating furnace from the preheating section to the heating section and soaking section is large. The function of each function is not the same. When selecting plastics, it is necessary to consider the use of performance, but also consider the price factor, but also consider the construction of the material. The fire-resistant plastics should pay attention to the problems in the construction of the heating furnace roof. (1) The storage and storage of the fire-resistant plastics on the site The fire-resistant plastics are a kind of gas-hard material, which means that the fire-resistant plastics can't destroy the packaging before the construction (usually Plastic bag packaging). Once the package is broken, the plastic will harden by air and lose its plasticity. Therefore, during the storage and storage of plastic, special attention should be paid to the integrity of the plastic outer package. (2) The bond between fire-resistant plastic and anchor brick must be tight. The top plastic can be attached around the anchor bricks and anchored on the top of the furnace. The close contact between the plastic and the anchor bricks directly affects the construction quality of the plastic roof, so it can be beaten in the plastic anchoring area. It is very important, in order to ensure the close contact between the anchor brick and the plastic, a certain number of wood molds must be made in advance in the shape of the anchor brick. When the plastic is applied, the mold can be stamped with a wood mold at the position of the anchor brick. After printing, the anchor bricks are set in the stampings, and the anchoring bricks are lightly pressed with a pneumatic hammer to make them in close contact with the plastic. It is necessary to allow the plastics to be in close contact with the anchoring bricks and not to damage the anchoring bricks when they are beaten. (3) to do a good plastic expansion joints and surface treatment plastics is a more shrinkable refractory material, in order to make it in the shrinkage can occur in accordance with the artificial way of cracking, plastic can be in the surface after removing the mold About 1.5m, a 3050mm deep-expanding suture is opened with a slitting knife, and the thickness is 1.52mm. That is to say, a square block of 1.5m square is cut in advance on the plastic surface. When the plastic shrinks, it will be opened in advance. The expansion joint cracks without irregular cracks. In a sense, the use of plastics for thermal equipment can eliminate the firing process of refractory bricks, save energy for society, and have great social benefits. With the constant improvement of the performance of plastics, more and more thermal equipment will use this new material. Stainless Steel Flanges ,Steel Flange,Ss Flange,Stainless Flange WENZHOU DIYE VALVE&FITTINGS CO.,LTD , https://www.diye-valve.com