CN103305656A - IF steel RH vacuum decarburization process control method - Google Patents
IF steel RH vacuum decarburization process control method Download PDFInfo
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Abstract
The invention discloses an IF steel RH vacuum decarburization process control method. The method comprises the steps of: creating a decarburization control model in the vacuum decarburization process, performing actual operation according to parameters output by the decarburization control model to control the vacuum decarburization process, wherein the parameters of the decarburization control model comprise initial condition of molten steel, oxygen blowing quantity, addition amount of tempering steel scrap, addition amount of deoxidized carbon powder and addition amount of aluminum particles; the decarburization control model can automatically calculate the necessary oxygen blowing quantity, the addition amount of tempering steel scrap and the addition amount of deoxidized carbon powder in the decarburization process according to the initial condition of molten steel, predict the content of active oxygen at the decarburization termination and calculate the necessary addition amount of aluminum particles for deoxidization and alloying. The IF steel RH vacuum decarburization process control model provided by the invention well meets the production demands, and an operator controls the production process according to the calculation values of the model, thereby improving the hit rate of IF steel oxygen blowing, effectively reducing the content of active oxygen at the IF steel decarburization termination and reducing the consumption of the aluminum particles.
Description
Technical field
The invention belongs to a kind of ultra low-carbon steel production process control manufacturing technology field, specifically, relate to a kind of IF steel RH vacuum decarburization course control method for use.
Background technology
At present, in the prior art, the IF steel, full name is Interstitial-Free Steel, and namely gapless atomic steel also claims ultra low-carbon steel sometimes, have extremely excellent deep drawability, elongation and r value can reach more than 50% and 2.0 now, are widely applied in automotive industry.RH refining full name is RH vacuum circulation degassing purifying method.Invented by the fritz in nineteen fifty-nine, wherein RH is that Germany adopted the first letter of two producers of RH refining techniques at that time.
The IF steel is the typical steel grade of high-level automobile in the plate, it is one of important symbol of weighing a national autobody sheet production, the serial ultra low-carbon steels such as the high Corrosion Protection deep-draw pot galvanize IF steel plate that gets up take the IF steel as base growth at present, the intensity I of leaping high F steel plate, deep-draw high strength baking hardening IF steel plate have been widely used in the production of car inner plate and panel.
At present each large steel mill can both the production carbon content less than the ultra low carbon IF steel 0.0020% below, but can in the dark decarburization of realization, can effectively control decarburization terminal point activity oxygen level and the aluminum shot consumption remains a difficult problem in smelting process.
" iron and steel alum titanium " magazine, (the 1st phase of the 30th volume in January, 2009, the 68th～72 page, IF steel carbon content labile factor is analyzed, the works such as Chen Liang) reported and climbed the steel IF steel carbon content control factors of instability, wherein the unstable of decarburization terminal point activity Control for Oxygen Content is to cause one of unsettled key factor of IF steel endpoint carbon content, needs to improve the oxygen blown hit rate of IF steel.
" China rare earth journal " magazine, in August, 2008 (the 26th volume, the 26th phase, the 608th～612 page, the RH vacuum decarburization process exploitation of extremely low carbon IF steel, works such as Zheng Jianzhong) reported that Baosteel passes through the foundation of IF steel decarburization model, realized that IF steel carbon content is less than 0.0020% production actual achievement, oxygen level when proposing to need the priority control converter tapping simultaneously avoids Molten Steel over-oxidation to cause decarburization terminal point activity oxygen level higher.
Above-mentioned two iron and steel enterprises all can the production carbon content less than 0.0020% IF steel, cause the carbon content of part heat to exceed standard but climb steel to the improper meeting of control of decarburization terminal point oxygen level; And Baosteel can be stablized the control carbon content by setting up IF steel carbon rejection process Decarburization Control model, but converter is had higher requirement, and if there is converter terminal peroxidation molten steel, its model can not take measures effectively to reduce decarburization terminal point activity oxygen level.
Summary of the invention
Technical problem to be solved by this invention is owing to lacking special IF steel RH vacuum decarburization process control in the prior art, to cause causing the carbon content of part heat to exceed standard to the improper meeting of control of decarburization terminal point oxygen level; Or only can stablize the control carbon content by setting up IF steel carbon rejection process Decarburization Control model, but converter is had higher requirement, if there is converter terminal peroxidation molten steel, its model can not take measures effectively to reduce the technical problems such as decarburization terminal point activity oxygen level, and a kind of IF steel RH vacuum decarburization course control method for use is provided.
Design of the present invention is, technical problem to be solved by this invention is to develop the automatic calculating Decarburization Control model of IF steel RH vacuum refinement process carbon rejection process, model can automatically calculate the required blowing oxygen quantity of carbon rejection process, cooling adding amount of scrap steel, deoxidation carbon dust add-on, dope decarburization terminal point activity oxygen level and calculate the required aluminum shot add-on of deoxidation and alloying according to the molten steel starting condition, having changed in the past, above-mentioned important parameter leans on the artificial mode of production of calculating of operator, the defective stove number that minimizing brings because of mishandle is realized standardized work.
By standardized work, improve IF steel oxygen blast hit rate, reduce IF steel decarburization terminal point activity oxygen level and reduce the aluminum shot consumption, reach and improve the purpose that steel quality reduces production costs.
Technical scheme provided by the present invention is that a kind of IF steel RH vacuum decarburization course control method for use is set up the Decarburization Control model in the vacuum decarburization process, carry out actually operating according to the parameter of described Decarburization Control model output, control vacuum decarburization process; The parameter of described Decarburization Control model comprises molten steel starting condition, blowing oxygen quantity, temperature adjustment adding amount of scrap steel, deoxidation carbon dust add-on and aluminum shot add-on etc.; Described Decarburization Control model can calculate the required blowing oxygen quantity of carbon rejection process, cooling adding amount of scrap steel, deoxidation carbon dust add-on automatically according to described molten steel starting condition, dopes decarburization terminal point activity oxygen level and calculates the required aluminum shot add-on of deoxidation and alloying.
The foundation of described Decarburization Control model is according to being:
Carbon content of molten steel Changing Pattern before process to RH at statistical study Argon station, described Decarburization Control model calculates RH and processes front molten steel initial carbon content;
Statistical study RH treating processes liquid steel temperature Changing Pattern, described Decarburization Control model calculate as guaranteeing to process the blowing oxygen quantity that the endpoint molten steel temperature needs chemical heating;
Statistical study RH treating processes temperature changing regularity, described model calculate as guaranteeing to process the cooling steel scrap consumption that the endpoint molten steel temperature need add;
The anti-material of statistical study RH vacuum tank passes oxygen, molten steel initial temperature, initial activity oxygen and initial carbon content in molten steel, described Decarburization Control model calculates as guaranteeing that the endpoint molten steel carbon content meets the requirements and needs to force required blowing oxygen quantity or the deoxidation carbon dust add-on of decarburization.
When molten steel RH initial temperature is 1624 when spending, the initial carbon content 0.051% of the molten steel that described Decarburization Control model calculates, blowing oxygen quantity 335Nm3, cooling adding amount of scrap steel 1275Kg, decarburization terminal point activity oxygen level 320%, deoxidation C powder add-on 0 Kg.
When molten steel RH initial temperature is 1610 when spending, the initial carbon content 0.04% of the molten steel that described Decarburization Control model calculates, blowing oxygen quantity 170Nm3, cooling adding amount of scrap steel 0Kg, decarburization terminal point activity oxygen level 320%, deoxidation C powder add-on 0 Kg.
When molten steel RH initial temperature is 1626 when spending, the initial carbon content 0.039% of the molten steel that described Decarburization Control model calculates, blowing oxygen quantity 200Nm3, cooling adding amount of scrap steel 1275Kg, decarburization terminal point activity oxygen level 320%, deoxidation C powder add-on 0 Kg.
When molten steel RH initial temperature is 1609 when spending, the initial carbon content 0.039% of the molten steel that described Decarburization Control model calculates, blowing oxygen quantity 185Nm3, cooling adding amount of scrap steel 0Kg, decarburization terminal point activity oxygen level 320%, deoxidation C powder add-on 0 Kg.
When molten steel RH initial temperature is 1619 when spending, the initial carbon content 0.03% of the molten steel that described Decarburization Control model calculates, blowing oxygen quantity 80Nm3, cooling adding amount of scrap steel 0Kg, decarburization terminal point activity oxygen level 320%, deoxidation C powder add-on 0 Kg.
Adopt technical scheme provided by the present invention, can effectively solve owing to lacking special IF steel RH vacuum decarburization process control in the prior art, cause causing the carbon content of part heat to exceed standard to the improper meeting of control of decarburization terminal point oxygen level; Or only can stablize the control carbon content by setting up IF steel carbon rejection process Decarburization Control model, but converter is had higher requirement, if there is converter terminal peroxidation molten steel, its model can not take measures effectively to reduce the technical problems such as decarburization terminal point activity oxygen level; Simultaneously, the IF steel RH carbon rejection process Decarburization Control model that the present invention develops, through repeatedly revising, satisfied well Production requirement, the operator carries out production process control according to the model calculated value, improve IF steel oxygen blast hit rate, effectively reduced IF steel decarburization terminal point activity oxygen level, reduced the aluminum shot consumption.
Embodiment
Technical scheme provided by the present invention is that a kind of IF steel RH vacuum decarburization course control method for use is set up the Decarburization Control model in the vacuum decarburization process, carry out actually operating according to the parameter of described Decarburization Control model output, control vacuum decarburization process; The parameter of described Decarburization Control model comprises molten steel starting condition, blowing oxygen quantity, temperature adjustment adding amount of scrap steel, deoxidation carbon dust add-on and aluminum shot add-on etc.; Described Decarburization Control model can calculate the required blowing oxygen quantity of carbon rejection process, cooling adding amount of scrap steel, deoxidation carbon dust add-on automatically according to described molten steel starting condition, dopes decarburization terminal point activity oxygen level and calculates the required aluminum shot add-on of deoxidation and alloying.
The foundation of described Decarburization Control model is according to being:
Carbon content of molten steel Changing Pattern before process to RH at statistical study Argon station, described Decarburization Control model calculates RH and processes front molten steel initial carbon content;
Statistical study RH treating processes liquid steel temperature Changing Pattern, described Decarburization Control model calculate as guaranteeing to process the blowing oxygen quantity that the endpoint molten steel temperature needs chemical heating;
Statistical study RH treating processes temperature changing regularity, described model calculate as guaranteeing to process the cooling steel scrap consumption that the endpoint molten steel temperature need add;
The anti-material of statistical study RH vacuum tank passes oxygen, molten steel initial temperature, initial activity oxygen and initial carbon content in molten steel, described Decarburization Control model calculates as guaranteeing that the endpoint molten steel carbon content meets the requirements and needs to force required blowing oxygen quantity or the deoxidation carbon dust add-on of decarburization.
When molten steel RH initial temperature is 1624 when spending, the initial carbon content 0.051% of the molten steel that described Decarburization Control model calculates, blowing oxygen quantity 335Nm3, cooling adding amount of scrap steel 1275Kg, decarburization terminal point activity oxygen level 320%, deoxidation C powder add-on 0 Kg.
When molten steel RH initial temperature is 1610 when spending, the initial carbon content 0.04% of the molten steel that described Decarburization Control model calculates, blowing oxygen quantity 170Nm3, cooling adding amount of scrap steel 0Kg, decarburization terminal point activity oxygen level 320%, deoxidation C powder add-on 0 Kg.
When molten steel RH initial temperature is 1626 when spending, the initial carbon content 0.039% of the molten steel that described Decarburization Control model calculates, blowing oxygen quantity 200Nm3, cooling adding amount of scrap steel 1275Kg, decarburization terminal point activity oxygen level 320%, deoxidation C powder add-on 0 Kg.
When molten steel RH initial temperature is 1609 when spending, the initial carbon content 0.039% of the molten steel that described Decarburization Control model calculates, blowing oxygen quantity 185Nm3, cooling adding amount of scrap steel 0Kg, decarburization terminal point activity oxygen level 320%, deoxidation C powder add-on 0 Kg.
When molten steel RH initial temperature is 1619 when spending, the initial carbon content 0.03% of the molten steel that described Decarburization Control model calculates, blowing oxygen quantity 80Nm3, cooling adding amount of scrap steel 0Kg, decarburization terminal point activity oxygen level 320%, deoxidation C powder add-on 0 Kg.
The present invention relates to the liquid steel refining field, particularly the control mode of the oxygen blast operation of IF steel RH vacuum refinement carbon rejection process and decarburization terminal point activity oxygen.
RH is according to the difference of molten steel initial carbon content, oxygen level and liquid steel temperature, and processing mode is also different, and the temperature height need add the cooling of temperature adjustment steel scrap; Carbon content is high, the low oxygen decarburization that needs of oxygen level; And the carbon content low oxygen content then need add the carbon dust deoxidation when high.
According to IF steel RH knowhow in recent years, this purpose target is to develop the automatic computation model of RH carbon rejection process, model can be according to the molten steel starting condition, calculate blowing oxygen quantity, temperature adjustment adding amount of scrap steel, deoxidation carbon dust add-on and aluminum shot add-on etc., Effective Raise the hit rate of RH treating processes all technical.
Decarburization model is set up according to as follows:
(1) carbon content of molten steel Changing Pattern before process to RH at statistical study Argon station, molten steel initial carbon content before model prediction RH processes;
(2) statistical study RH treating processes liquid steel temperature Changing Pattern, model prediction is for guaranteeing to process the blowing oxygen quantity that the endpoint molten steel temperature needs chemical heating;
(3) statistical study RH treating processes temperature changing regularity, model prediction is for guaranteeing to process the cooling steel scrap consumption that the endpoint molten steel temperature need add;
(4) the anti-material of statistical study RH vacuum tank passes oxygen, molten steel initial temperature, initial activity oxygen and initial carbon content in molten steel, and model prediction needs by force for guaranteeing that the endpoint molten steel carbon content meets the requirements
The IF steel RH carbon rejection process Decarburization Control model that the present invention develops, through repeatedly revising, satisfied well Production requirement, formally came into operation in 2010, the operator carries out production process control according to the model calculated value, improve IF steel oxygen blast hit rate, effectively reduced IF steel decarburization terminal point activity oxygen level, reduced the aluminum shot consumption.
In implementation, IF steel production process is after having used process Decarburization Control model, RH produces IF steel oxygen blast qualification rate rate, decarburization terminal point activity oxygen qualification rate improves constantly, and has reached respectively 95.1% and 92.5% to oxygen blast in November, 2010 qualification rate and decarburization terminal point activity oxygen qualification rate.
IF steel ton steel aluminum shot consumption is also by average 2Kg in 2009, be reduced to 1.15Kg, produce 40000 tons of IF steel monthly outputs with RH, the aluminum shot production cost is 14.96 yuan/Kg, and calculate per month and reduce because the aluminum shot consumption reduces the production cost that produces: (2-1.15) * 40000 * 14.96 ÷ 10000=50.864(is ten thousand yuan).
The reduction of IF steel decarburization terminal point activity oxygen level has improved steel quality and production cost has been saved in the reduction of aluminum shot consumption.
The RH that the present invention's invention is developed produces IF steel process Decarburization Control model, can be according to the molten steel starting condition, calculate blowing oxygen quantity, add the aluminium amount, carbon dust add-on, cooling steel scrap amount and dope decarburization terminal point activity oxygen level etc., RH operator carry out production operation in strict accordance with the model calculated value, have realized standardized work.
Adopt the calculated value of the IF steel RH vacuum refinement carbon rejection process Decarburization Control model that this patent develops to instruct production at the RH vacuum refining furnace, model calculated value and actual production measured value are very approaching, the RH decarburization model can adapt to the actual production requirement fully, and model calculated value and measured value degree of conformity are higher, and actual production is had stronger guiding value.For example:
Magnitude value 1:
Measured value: 1624 ℃ of molten steel RH initial temperatures, the initial C 0.049% of molten steel, blowing oxygen quantity 310Nm3, cooling adding amount of scrap steel 1000Kg, deoxidation C powder add-on 0Kg, decarburization terminal point activity oxygen level 280%
Decarburization Control model numerical value: 1624 ℃ of molten steel RH initial temperatures draw the initial carbon content 0.051% of molten steel, blowing oxygen quantity 335Nm3, cooling adding amount of scrap steel 1275Kg, deoxidation C powder add-on 0 Kg, decarburization terminal point activity oxygen level 320%.
Numerical value 2:
Measured value: 1610 ℃ of molten steel RH initial temperatures, the initial C 0.039% of molten steel, blowing oxygen quantity 277Nm3, cooling adding amount of scrap steel 0Kg, deoxidation C powder add-on 0Kg, decarburization terminal point activity oxygen level 310%.
When molten steel RH initial temperature is 1610 when spending, the initial carbon content 0.04% of the molten steel that described Decarburization Control model calculates, blowing oxygen quantity 170Nm3, cooling adding amount of scrap steel 0Kg, decarburization terminal point activity oxygen level 320%, deoxidation C powder add-on 0 Kg.
Numerical value 3:
Measured value: 1626 ℃ of molten steel RH initial temperatures, the initial C 0.043% of molten steel, blowing oxygen quantity 257Nm3, cooling adding amount of scrap steel 1700Kg, deoxidation C powder add-on 0Kg, decarburization terminal point activity oxygen level 272%;
When molten steel RH initial temperature is 1626 when spending, the initial carbon content 0.039% of the molten steel that described Decarburization Control model calculates, blowing oxygen quantity 200Nm3, cooling adding amount of scrap steel 1275Kg, decarburization terminal point activity oxygen level 320%, deoxidation C powder add-on 0 Kg.
Numerical value 4:
Measured value: 1609 ℃ of molten steel RH initial temperatures, the initial C 0.042% of molten steel, blowing oxygen quantity 200Nm3, cooling adding amount of scrap steel 0Kg, deoxidation C powder add-on 0Kg, decarburization terminal point activity oxygen level 313%;
When molten steel RH initial temperature is 1609 when spending, the initial carbon content 0.039% of the molten steel that described Decarburization Control model calculates, blowing oxygen quantity 185Nm3, cooling adding amount of scrap steel 0Kg, decarburization terminal point activity oxygen level 320%, deoxidation C powder add-on 0 Kg.
Numerical value 5:
Measured value: 1619 ℃ of molten steel RH initial temperatures, the initial C 0.032% of molten steel, blowing oxygen quantity 60Nm3, cooling adding amount of scrap steel 0Kg, deoxidation C powder add-on 0Kg, decarburization terminal point activity oxygen level 334%;
When molten steel RH initial temperature is 1619 when spending, the initial carbon content 0.03% of the molten steel that described Decarburization Control model calculates, blowing oxygen quantity 80Nm3, cooling adding amount of scrap steel 0Kg, decarburization terminal point activity oxygen level 320%, deoxidation C powder add-on 0 Kg.
Claims (7)
1. an IF steel RH vacuum decarburization course control method for use is characterized in that, sets up the Decarburization Control model in the vacuum decarburization process, carries out actually operating according to the parameter of described Decarburization Control model output, control vacuum decarburization process;
The parameter of described Decarburization Control model comprises molten steel starting condition, blowing oxygen quantity, temperature adjustment adding amount of scrap steel, deoxidation carbon dust add-on and aluminum shot add-on etc.;
Described Decarburization Control model can calculate the required blowing oxygen quantity of carbon rejection process, cooling adding amount of scrap steel, deoxidation carbon dust add-on automatically according to described molten steel starting condition, dopes decarburization terminal point activity oxygen level and calculates the required aluminum shot add-on of deoxidation and alloying.
2. a kind of IF steel RH vacuum decarburization course control method for use according to claim 1 is characterized in that, the foundation of described Decarburization Control model is according to being:
Carbon content of molten steel Changing Pattern before process to RH at statistical study Argon station, described Decarburization Control model calculates RH and processes front molten steel initial carbon content;
Statistical study RH treating processes liquid steel temperature Changing Pattern, described Decarburization Control model calculate as guaranteeing to process the blowing oxygen quantity that the endpoint molten steel temperature needs chemical heating;
Statistical study RH treating processes temperature changing regularity, described model calculate as guaranteeing to process the cooling steel scrap consumption that the endpoint molten steel temperature need add;
The anti-material of statistical study RH vacuum tank passes oxygen, molten steel initial temperature, initial activity oxygen and initial carbon content in molten steel, described Decarburization Control model calculates as guaranteeing that the endpoint molten steel carbon content meets the requirements and needs to force required blowing oxygen quantity or the deoxidation carbon dust add-on of decarburization.
3. a kind of IF steel RH vacuum decarburization course control method for use according to claim 1 and 2, it is characterized in that, when molten steel RH initial temperature is 1624 when spending, the initial carbon content 0.051% of the molten steel that described Decarburization Control model calculates, blowing oxygen quantity 335Nm3, cooling adding amount of scrap steel 1275Kg, decarburization terminal point activity oxygen level 320%, deoxidation C powder add-on 0 Kg.
4. a kind of IF steel RH vacuum decarburization course control method for use according to claim 1 and 2, it is characterized in that, when molten steel RH initial temperature is 1610 when spending, the initial carbon content 0.04% of the molten steel that described Decarburization Control model calculates, blowing oxygen quantity 170Nm3, cooling adding amount of scrap steel 0Kg, decarburization terminal point activity oxygen level 320%, deoxidation C powder add-on 0 Kg.
5. a kind of IF steel RH vacuum decarburization course control method for use according to claim 1 and 2, it is characterized in that, when molten steel RH initial temperature is 1626 when spending, the initial carbon content 0.039% of the molten steel that described Decarburization Control model calculates, blowing oxygen quantity 200Nm3, cooling adding amount of scrap steel 1275Kg, decarburization terminal point activity oxygen level 320%, deoxidation C powder add-on 0 Kg.
6. a kind of IF steel RH vacuum decarburization course control method for use according to claim 1 and 2, it is characterized in that, when molten steel RH initial temperature is 1609 when spending, the initial carbon content 0.039% of the molten steel that described Decarburization Control model calculates, blowing oxygen quantity 185Nm3, cooling adding amount of scrap steel 0Kg, decarburization terminal point activity oxygen level 320%, deoxidation C powder add-on 0 Kg.
7. a kind of IF steel RH vacuum decarburization course control method for use according to claim 1 and 2, it is characterized in that, when molten steel RH initial temperature is 1619 when spending, the initial carbon content 0.03% of the molten steel that described Decarburization Control model calculates, blowing oxygen quantity 80Nm3, cooling adding amount of scrap steel 0Kg, decarburization terminal point activity oxygen level 320%, deoxidation C powder add-on 0 Kg.
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| CN105603158A (en) * | 2016-03-10 | 2016-05-25 | 河北钢铁股份有限公司邯郸分公司 | Method for controlling dissolved carbon content in ultralow-carbon bake-hardening steel |
| CN108060289A (en) * | 2017-12-12 | 2018-05-22 | 马鞍山钢铁股份有限公司 | A kind of temperature-compensating refinery practice of RH refining furnaces production IF steel |
| CN110684883A (en) * | 2019-11-18 | 2020-01-14 | 马鞍山钢铁股份有限公司 | Steelmaking method for reducing tapping temperature of vacuum decarburization steel converter |
| CN114085955A (en) * | 2021-10-19 | 2022-02-25 | 首钢集团有限公司 | Method, device, equipment and medium for monitoring carbon content in vacuum decarburization process |
| CN115572793A (en) * | 2022-11-09 | 2023-01-06 | 马鞍山钢铁股份有限公司 | RH smelting method and system for low-carbon aluminum killed steel |
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| CN108060289A (en) * | 2017-12-12 | 2018-05-22 | 马鞍山钢铁股份有限公司 | A kind of temperature-compensating refinery practice of RH refining furnaces production IF steel |
| CN110684883A (en) * | 2019-11-18 | 2020-01-14 | 马鞍山钢铁股份有限公司 | Steelmaking method for reducing tapping temperature of vacuum decarburization steel converter |
| CN114085955A (en) * | 2021-10-19 | 2022-02-25 | 首钢集团有限公司 | Method, device, equipment and medium for monitoring carbon content in vacuum decarburization process |
| CN115572793A (en) * | 2022-11-09 | 2023-01-06 | 马鞍山钢铁股份有限公司 | RH smelting method and system for low-carbon aluminum killed steel |
| CN115572793B (en) * | 2022-11-09 | 2024-01-26 | 马鞍山钢铁股份有限公司 | RH smelting method and system for low-carbon aluminum killed steel |
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