Graphite crucibles are known for their excellent thermal conductivity and high temperature resistance. Their low coefficient of thermal expansion allows them to withstand rapid heating and cooling. They also exhibit strong corrosion resistance to acid and alkaline solutions, exhibiting excellent chemical stability. In metallurgy, casting, machinery, chemical industry and other industrial sectors, it is widely used in the smelting of alloy tool steel, non-ferrous metals and their alloys, and has good technical and economic benefits. The following Haoyu graphite products manufacturer will introduce some precautions when using graphite crucible. Precautions: Handle with care during transportation to avoid damage to the surface coating and avoid rolling. Store in a dry environment to prevent moisture. When used in a coke oven, the bottom should be a crucible base with a diameter slightly larger than the bottom diameter of the crucible to provide proper support. When loaded into the furnace, the crucible must not be tilted, and the top opening must not be higher than the furnace mouth. If support bricks are used between the crucible top opening and the furnace wall, the bricks should be higher than the crucible opening. The weight of the furnace cover should be on the furnace wall. The size of the coke used should be smaller than the gap between the furnace wall and the crucible. They should be added by free-falling from a height of at least 5 cm and should not be tapped. Before use, the crucible should be heated from room temperature to 200°C for 1-1.5 hours (especially when heating for the first time, the crucible must be turned continuously to ensure that the inside and outside of the crucible are heated evenly, and the maximum temperature rise is 100°C). After cooling slightly and removing steam, continue heating). It was then heated to about 800°C for 1 hour. Baking time should not be too long. (If improper preheating causes peeling and cracking, it is not a quality problem, and our company is not responsible for returns.) The furnace walls should be kept intact to prevent deflection of the flame. If a burner is used for heating, the flame should not be sprayed directly on the crucible, but on the base of the crucible. Proper crucible tongs should be used for lifting and loading. When loading metal, a layer of scrap should be spread on the bottom before inserting the metal ingot. But the metal should not be placed too tight or level as this may cause the crucible to crack due to metal expansion. Continuous melting reduces the time between crucibles. If the use of the crucible is interrupted, the remaining liquid should be scooped out to avoid rupture when it is resumed. During the smelting process, the amount of refining agent must be strictly controlled. Excessive use will shorten the life of the crucible. Accumulated slag must be removed regularly to avoid altering the shape and capacity of the crucible. Excessive slag buildup can also cause the top to swell and crack. By following these precautions, you can ensure optimal function and life of your graphite crucible.
Post time: Jul-05-2023