Smelting method for complete-flow low-oxygen-level producing of IF steel
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A smelting method and technology of the whole process, applied in the field of iron and steel smelting, can solve the problems of unfavorable continuous casting, control of oxygen content, unfavorable molten steel quality, etc., and achieve the effect of improving the cleanliness level of molten steel, reducing the degree of peroxidation, and achieving significant economic benefits.
Active Publication Date: 2019-09-06
MAANSHAN IRON & STEEL CO LTD
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Problems solved by technology
At present, the smelting of IF steel is mainly produced by the technological process of "converter → alloy fine-tuning station → RH refining furnace → slab continuous casting". In the above-mentioned processes, on the one hand, the two operation sub-units of converter dephosphorization and RH decarburization require molten steel There is a certain amount of oxygen content, and the oxygen content at the end of the converter is too high, which will lead to strong oxidation of the final slag of the converter that inevitably enters the ladle, affecting the castability of molten steel in the continuous casting process; during the RH decarburization period, the oxygen content of molten steel is high, and the slag will be poured into the ladle. Transfer, thereby improving the oxidation of ladle slag, which is also not conducive to continuous casting; RH decarburization end point has high oxygen content, and the deoxidation product Al 2 o 3 The large amount of production will seriously affect the quality of IF steel. The Chinese patent "Smelting method of high-strength IF steel" has the following disadvantages: ① The oxygen content at the end of the converter is as high as 800-1000ppm. The oxygen content at the end point is still as high as 400-750ppm, such a high oxygen needs to be oxidized by adding aluminum, resulting in a large amount of deoxidized product Al 2 o 3 , which is not conducive to the quality of molten steel, and also increases the production cost; ②Adding slow-release deoxidizer multiple times, the amount of slow-release deoxidizer added needs to be adjusted according to specific smelting parameters, which increases the workload of on-site operators and is not conducive to on-site standardized operations. The Chinese patent "a method for composite deoxidation of ultra-low carbon IF steel" has the following disadvantages: ① The oxygen content is not controlled from the source
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Embodiment 1
[0027] from figure 1 It can be seen that the smelting method for producing IF steel in a whole process low-oxygen position of the present embodiment, the steps are:
[0028] Step 1: After the smelting of the converter steel, the slag is poured, and 10-15 tons of slag is left in the converter, and 50-100 kg of coke powder is added to remove the oxygen in the slag, and then the slag splashing operation is carried out to protect the furnace;
[0029] The chemical composition requirements of IF steel are: C≤0.0050%, Si≤0.01%, Mn: 0.08~0.25%, P≤0.015%, S≤0.008%, Als: 0.030~0.050%, Ti: 0.030~0.070%;
[0030] The slag composition range of converter slag is: TFe: 12-25%, CaO: 40-60%, SiO 2 : 10~18%, MnO: 2~3%, MgO: 3~6%;
[0031] Composition of coke powder is C≤94%, H2O≤0.020%, S≤0.022%, volatile + ash≤5%, particle size 5-15mm;
[0032] Step 2: Converter charging; the molten iron-scrap linkage ratio mode is adopted, and the amount of molten iron and scrap added is based on the prin...
Embodiment 2
[0064] A kind of smelting method of producing IF steel in the low oxygen position of the whole process of the present embodiment, its steps are:
[0065] Step 1: After the smelting of the last furnace of steel in the converter, the slag is dumped, leaving 13 tons of slag in the converter, adding 75 kg of coke powder to remove the oxygen in the slag, and then performing slag splashing to protect the furnace;
[0066] Step 2: Converter charging: adopt the molten iron-scrap linkage ratio mode, add 298t of molten iron and 33t of scrap steel, of which molten iron Si: 0.28%;
[0067] Step 3: Converter main blowing: Calculated according to “lime addition = 2.14×W[Si]×R×1000 / A”, the total lime addition is 27.1kg / t steel, where W[Si]: 0.28 %, R: 4, W(CaO): 90%, W(SiO 2): 0.35%: tapping amount: 297t, you need to add 8.0t of lime: 4 minutes before blowing: add lime to the converter in 3 batches, keep the lance position at 2.7m, and the oxygen flow rate of the top lance is 63000m 3 / h, ...
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Abstract
The invention discloses a smelting method for complete-flow low-oxygen-level producing of IF steel, and belongs to the technical field of steel smelting. The method comprises the steps that firstly, after converter steel smelting is finished, deslagging is carried out, 10 to 15 tons of slag is left in a converter, 50 to 100 kg of coke powder is added for removing oxygen in the slag, and the slag-splashing furnace protection operation is carried out; secondly, converter charging is carried out; thirdly, converter main blowing is carried out; fourthly, after converter main blowing is finished, through an auxiliary gun, the molten steel temperature and the carton content are measured, and according to the measuring value, auxiliary oxygen blowing amount is controlled; fifthly, after auxiliaryblowing is finished, before tapping, strong bottom blowing is carried out for 30 seconds; sixthly, converter tapping is carried out; seventhly, molten steel enters in the RH procedure; and eighthly,after a steel ladle is jacked, a vacuum pump is started for vacuum pumping decarburization. The converter tapping molten steel peroxidation degree is reduced, the steel ladle slag oxidation is reduced, the generation amount of deoxidation type inclusions Al2O3 can be reduced, the molten steel cleanliness level is improved, the cost is reduced, and the obvious economic benefits are achieved.
Description
technical field [0001] The invention relates to the technical field of iron and steel smelting, and more specifically, relates to a smelting method for producing IF steel with low oxygen level in the whole process. Background technique [0002] IF steel has excellent stamping and forming properties. At present, the smelting of IF steel is mainly produced by the technological process of "converter → alloy fine-tuning station → RH refining furnace → slab continuous casting". In the above-mentioned processes, on the one hand, the two operation sub-units of converter dephosphorization and RH decarburization require molten steel There is a certain amount of oxygen content, and the oxygen content at the end of the converter is too high, which will lead to strong oxidation of the final slag of the converter that inevitably enters the ladle, affecting the castability of molten steel in the continuous casting process; during the RH decarburization period, the oxygen content of molten...
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