Cupola molten iron material: carbon 3 0 silicon 1 8 manganese 0 8 how to ingredient

Determine the ingredients. According to the 2 items, it is easy to set a general stable addition material in the plant (the amount of pig iron added in some plants is unchanged, some are scrap steel, and some are return material), that is, one of the pig iron, scrap steel, and return material is invariant, and it is easy to calculate the carbon content of the other 2 variables. Then calculate the silicon content and manganese content in this case, and make up the deficiency with silicon-manganese alloy.

Note that each material is a certain content, not 100%); When calculating the amount of silicon, pay attention to reserving the incubation space in front of the furnace.

High carbon and low silicon. Increase the amount of scrap and ferrosilicon. Reason: Pig iron is of different batches and grades. The amount of carbon and silicon is also different, so it leads to the phenomenon you said. The answer is as simple as that. Workaround:

Calculated according to 100 kg batch: return material; Z15 pig iron 70%; 40fesi；55femn；Silicon burning loss rate 20%; Manganese burn rate 20%. The carburization is calculated by 10%, which should be estimated and adjusted according to the melting rate, if it is a fast melting by high wind, the carburization rate will be small, which is the carburization rate can be calculated at 5%.

If the return material is other high-carbon equivalent casting scrap or a gating system, the resulting elemental changes are calculated. First of all, according to the element burning rate, calculate the chemical composition of the ingredients: such as SI (batching) = SI (silicon required) (matching) = MN (requirements) (matching) = C (requirements) (1+, etc.)

Then, according to the amount of return material to be consumed (customized), the weight of the return material is subtracted by 100 kg. Finally, the system of equations is used to solve the amount of pig iron, ferrosilicon and ferromanganese.

According to the chemical composition, the closest is GH3128 superalloy GH3128 characteristics and application field overview: The alloy is a nickel-based alloy with tungsten and molybdenum solution strengthened and strengthened with boron, cerium and zirconium at grain boundaries, which has high plasticity, high lasting creep strength and good oxidation and stamping and welding properties.

This is a professional chemical testing and analysis organization, and you only need to provide samples to analyze the formula of ferrosilicon alloy charge.

Demonstrate how to quickly calculate ingredients:

Demonstration of recycled aluminum alloy ADC12 ingredients.

Is this an ingredient for a cupola or an electric furnace?

The working process of the cupola: a certain amount of coal is first loaded into the furnace as the bottom coke, and its height is generally more than one meter. After ignition, the bottom coke is added to the specified height, and the top surface from the tuyere to the bottom coke is the bottom coke height.

Then, according to the melting rate of the furnace, the prepared limestone, metal charge and layer coke are added from the charging port in batches in order. Keep the top surface of the charge on the lower edge of the charging port throughout the furnace opening process. The air that is blown into the furnace through the tuyere reacts with the bottom coke, and the generated high-temperature furnace gas flows upward, heats the charge, and melts the first batch of metal charge on the top surface of the bottom coke.

The molten iron droplets are further heated by high-temperature furnace gas and red-hot coke as they fall to the furnace cylinder, a process known as superheating. With the burning loss of the bottom coke and the melting of the metal charge, the material layer gradually decreases. After each batch of charge is melted, the fuel is supplemented by the external layer coke, so that the height of the bottom coke remains basically the same, and the whole melting process is carried out continuously.

Application field: Cupola furnace is mainly used in steel, metallurgy, mining and other industries.

The limestone in the charge is decomposed into lime and carbon dioxide under the action of high-temperature furnace gas. Lime is an alkaline oxide, which can be combined with the ash in the coke and the impurities in the charge, metal oxides and other acidic substances to form a slag with a low melting point. The molten slag also falls onto the furnace and floats on the molten iron.

In the cupola, three important processes are carried out at the same time: the combustion of bottom coke, the transfer of heat and the metallurgical reaction. According to the different physical and chemical reactions, the cupola furnace takes the combustion zone as the core, and is divided into five areas from top to bottom: pre-tropical zone, melting zone, reduction zone, oxidation zone and furnace cylinder.

Due to the action of furnace gas, coke and slag, the composition of the melted metal also undergoes certain changes. Of the five major elements of cast iron, carbon and sulfur generally increase, silicon and manganese generally burn out, and phosphorus does not change much. The final chemical composition of molten iron is the combined result of the original composition of the metal charge and the changes in composition during the melting process.

Process measures: 1. Increase the height of the superheating zone (i.e., the height of the bottom coke), so that the molten iron can be fully contacted with the coke during the superheating process and increase the carbon.

2. The controlled addition of toner powder in the bellows to control its entry into the furnace chamber with the wind can also play a significant role in carbon increase, and the world's No. 1 German Kutnner has leading technology in this regard.

3. Revise the ingredients, and predict the molten iron situation that should be reached when feeding.

4. When tapping iron, add the carburizer appropriately and stir it thoroughly.

It is appropriate to increase the height of the bottom coke, and the retention of the molten iron furnace cylinder is more intermittent to increase the amount of layer coke.

This is not easy to answer, first of all, you have to test the composition of your raw material pig iron and coke: the proportion of each element in it! Then, according to the test report, to adapt to the HT250 material to batch, not blind!

Generally, inoculants are added! Scrap is used to reduce costs!

I don't know what type of cupola furnace it is, generally according to 40% scrap steel, 40% pig iron, 20% reused iron, according to the furnace carburization effect to adjust the ratio of pig iron to scrap steel. The main thing is to control the white mouth and temperature in front of the furnace.

I haven't practiced this before, but I hope it can give you some reference. Circuit smelting gray iron is the most suitable smelting method today, the only disadvantage is that its smelting quality is not as high as the quality of the cupola electric furnace duplex, but it is very environmentally friendly. Circuit smelting is mainly to pay attention to the proportion of scrap steel in the batching, more than 60% of the scrap steel has no benefit to the molten iron, thinking that the steel is not like the pig iron innate good flake graphite structure, if only the use of the inoculation process before the furnace to improve the flake graphite is very difficult.

Therefore, the amount of scrap steel used in general electric furnace smelting should not exceed 60%. As for the ingredients, the main raw materials should be scrap steel, carburizers, and return materials. But quite a few companies are also trying to attach silicon carbide.

The function of silicon carbide is not to increase carbon and silicon, but to increase the nucleation particles in the molten iron, which is conducive to the nucleation of flake graphite. Generally, the carbon content of the carburizer is between 95% and 98%, and the absorption is natural, which has to be actually measured, and the absorption rate is naturally different according to the different equipment. 80%-90%, FYI.

The carbon content in scrap steel is generally (A3 steel), and the carbon content of HT250 return material is carbon as the first element ingredient, and other supplements, such as the lack of silicon, the ferrosilicon, and the lack of ferromanganese. The amount is just a matter of electron**, it's not too difficult. In addition, the lining of the general electric furnace has the effect of increasing silicon, and the ablation of carbon is also very small, and the actual data also varies from furnace to furnace.

The ingredients need to be calculated according to the composition and rate of the materials selected to be added, and the standard of the grade to be produced

The furnace temperature is too low, and the coke combustion is not sufficient. It can be considered to increase the air temperature and increase the height of the bottom coke to form a reducing atmosphere.

The main reason for the high iron oxide is that your wind speed is too high, and the tap hole freezes because your front bag is not drying in place, and the tap hole is damp.