Ductile iron foundry for your interpretation of the nodular cast iron smelting how to choose the nodularizer nodularizer and inoculant is important material in the process of nodulizing treatment, in addition to the stable quality, choose the appropriate spheroidizing agent also need to consider the following factors.
Spheroidizing temperature: if the spheroidizing temperature & gt;
1480 ℃, spheroidizing reaction will be more severe, causing the low magnesium absorption rate.
In order to make the spheroidizing stable reaction, can choose relatively high calcium content of nodularizer.
If the spheroidizing temperature & lt;
1480 ℃, then you can use calcium content is lower relatively, spheroidizing agent.
Handle packet size: if processing package high ratio of 1:1, the magnesium steam loss will lead to magnesium absorption rate lower, recommend the use of nodularizer calcium content is higher.
If processing package 2:1 ratio of height to diameter, the spheroidizing reaction will be more smoothly, magnesium vapor will spread to the fluid of the iron, magnesium absorption rate was improved.
Spheroidizing treatment process: if you do not use cover package method, then the ball reaction smoke will enter into the atmosphere, and creates a dazzling white light.
In order to make the spheroidizing stable reaction, can use low high calcium magnesium nodulizing agent.
If you use a cover bag method, liquid iron not splash, and smoke less, can use low magnesia calcium nodularizer, to reduce the addition amount, decrease the cost of nodulizing.
Processing weight: if the weight is less than 500 kg of iron liquid, then can use particle size smaller nodularizer, it is recommended to use size 12 mm below the spheroidizing agent.
If the weight of iron liquid in 500 ~ 1000 kg, but the nodularizer with large size, such as particle size is 3 ~ 25 mm spheroidizing agent.
If handled the weight greater than 1000 kg of iron liquid, you can use 4 ~ 32 mm spheroidizing agent.
Silica content: if the process of casting
products production rate is low or high rejection rate, want to add back to the furnace charge and scrap steel smelting in the form of die castings have strict request for the silicon content of hot metal.
On the premise of inoculation quantity was not able to further reduce, the low silicon nodularizer can be used for processing, can make back to the furnace charge more 8% ~ 15%, so can reduce the production cost of foundry.
The original iron liquid sulfur content: if the original iron liquid sulfur content is higher, if not for desulfurization process, requires the magnesia high rare earths nodularizer, and join the amount will be higher, if the original iron liquid sulfur content is low, you can use low magnesium rare-earth nodulizing agent, and can lower the dosage, low magnesium rare-earth nodulizing agent cost will be cheaper.
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