Riser heating and insulating agent

Abstract

The invention discloses a riser heating and insulating agent, which comprises the following components in percentage by weight: 5 to 35 percent of Al, 10 to 25 percent of AlN, 3 to 20 percent of low-carbon graphite, 5 to 25 percent of magnesia-alumina spinel, 5 to 15 percent of quartz, 10 to 30 percent of ferric oxide powder, 5 to 20 percent of corundum, 5 to 10 percent of organosilicon phlogopite, and 1 to 10 percent of MgO; and the riser heating and insulating agent is prepared by the following processes: crushing, pulverizing, mixing, pelletizing, drying, and the like. The riser heating and insulating agent has double effects of heating and insulating, and has good insulating effect. Because the riser heating and insulating agent has a granular appearance, dust and smoke are not generated in the using process, and the environment is not polluted. Due to the adoption of the low-carbon graphite, castings do not have carburizing phenomenon, and the molten steel is not polluted. The riser heating and insulating agent is particularly applied to open risers of low carbon steel large-scale steel castings and stainless steel castings with the weight of over 80 tons.

Description

technical field [0001] The invention relates to the technical field of metal casting production, in particular to a riser heat-preserving agent used in casting production of stainless steel castings and large low-carbon steel castings weighing more than 80 tons. Background technique [0002] Low-carbon steel large-scale steel castings are widely used in power stations, petrochemicals, metallurgy, ships and equipment manufacturing industries, such as pump bodies and steam turbine cylinders in nuclear power equipment, runners and blades in hydropower units, and cylinder parts in thermal power units , Rolling mill stands, rolls, large bearing housings, etc. in large metallurgical equipment. So far, steel castings weighing less than 50 tons have already had mature production theory and production experience, and the quality of steel castings below 50 tons can be controlled, but for steel castings weighing more than 50 tons, domestic and foreign There is no mature theory and exp...

AI Technical Summary

Problems solved by technology

However, plant ash and fly ash are troublesome to store, seriously pollute the working environment during use, and have poor heat preservation effect; the melting point of carbonized rice husk exceeds the temperature of molten steel, which acts as a carbon skeleton, but the spreadability is poor, and the heat preservation effect is unstable. Carbon or ultra-low carbon steel tends to increase carbon, and is prone to crusting, which is also more polluting to the environment

[0004] In addition, the chemical composition of stainless steel castings requires low carbon content. During the casting process, the use of traditional riser covering agents often causes the castings to increase carbon and pollute the castings.