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What is the correct choice of the amount of creeping agent?

2019-10-10

There are certain conditions for how to choose and use the amount of creeping agent. Only when the amount of additives exceeds a certain critical point can vermicular graphite cast iron with excellent comprehensive properties be obtained and can only be stabilized in a narrow range. This modifier is called a creeping agent. The correct selection and control of the amount of creeping agent is the first condition for the stable production of vermicular graphite iron. Everything will have characteristics, including the creeping agent will also have physical characteristics. There are also some practical problems in the manufacturing process, which need to be solved by relevant researchers. There are many types of creeping agents, and enterprises choose appropriate creeping agent products according to their needs. Although the creeping agent has excellent performance, its wide application still faces some challenges. Colleagues or friends in this industry may be very clear, but most people still do not understand this industry well. The amount of creeping agent should be determined according to its chemical composition, molten iron state and cooling conditions.


The melting point of magnesium is 650c, the boiling point of zinc is 419c, and the boiling point of zinc is 907c. The creeping agent contains magnesium and zinc, which can make the alloy boil. Its steam can penetrate the coating on the surface of the creeping agent particles, instead of artificial stirring, and improve the absorption rate of the creeping agent. In addition, magnesium and zinc can also reduce the melting point of the creeping agent: zinc can also appropriately increase the density of the alloy (magnesium density is 1.74, zinc density is 7.14), thereby increasing the absorption rate of the alloy.


The main components of the rare earth magnesium-zinc alloy (20xtznm94-4) currently supplied are re: 18-22%, ca: 3-5%, mg: 3-5%, ti: 1-2%, si< 45%.="" the="" method="" of="" adding="" alloy="" is="" to="" punch="" holes="" in="" the="" pits="" at="" the="" bottom="" of="" the="" cladding="" layer.="" for="" inoculation,="" large="" ferrosilicon="" (0.2-0.3%="" by="" weight="" of="" molten="" iron)="" is="" used="" for="" instant="" inoculation="" before="" pouring.="" a="" ferrosilicon="" "relay"="" is="" added="" when="" all="" melting="" is="" imminent.="" the="" processing="" temperature="" is="">


The rare earth magnesium-zinc alloy treatment has less molten iron scum and whiteness tendency, but the range of worm-like graphite obtained is relatively narrow. It is suitable for producing vermicular graphite cast iron with thickness above one level. The vermicular graphite cast iron can only obtain vermicular graphite cast iron with excellent comprehensive performance after adding modifier to exceed a certain critical point, and can only be stable in a narrow range. This modifier is called a creeping agent. The correct selection and control of the amount of creeping agent is the first condition for the stable production of vermicular graphite iron. The amount of creeping agent should be determined according to its chemical composition, molten iron state and cooling conditions.


The above is the introduction of the creeping agent. Due to the composition of the creeping agent and the suitable addition range of molten iron under different conditions, it is necessary to clarify the role of the main metamorphic elements and some trace elements in cast iron. On this basis, the creeping agents that can be used in production were evaluated, and a possible way to develop new creeping agents was proposed. If you want to know more, please pay attention to the official website of Fangyuan Rare Earth, we will provide you with quality service wholeheartedly!


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