CN102676742A - Process method for reducing RH vacuum decarbonization end-point oxygen content of ultra-low-carbon steel - Google Patents
Process method for reducing RH vacuum decarbonization end-point oxygen content of ultra-low-carbon steel Download PDFInfo
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- CN102676742A CN102676742A CN201210085132XA CN201210085132A CN102676742A CN 102676742 A CN102676742 A CN 102676742A CN 201210085132X A CN201210085132X A CN 201210085132XA CN 201210085132 A CN201210085132 A CN 201210085132A CN 102676742 A CN102676742 A CN 102676742A
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Abstract
The invention provides a process method for reducing RH vacuum decarbonization end-point oxygen content of ultra-low-carbon steel and belongs to the technical field of production and processing of ultra-low-carbon steel. The process method comprises the following steps: 1) in an early period of RH vacuum decarbonization, adding a pollution-free deoxidant from a feed bin to a vacuum chamber, and removing partial oxygen from the steel; 2) further reducing vacuum degree for deep carbonization; and 3) after the RH vacuum decarbonization treatment is finished, using aluminum particles as a final deoxidant, and deoxidizing and alloying other alloy elements according to steel grade requirements. By the process method, the RH decarbonization end-point oxygen content can be reduced, and the active oxygen content of molten steel is controlled to be 250-400ppm when the RH decarbonization is finished, so that the consumption of final deoxidizing aluminum particles is reduced, the inclusion content in the molten steel is reduced, the cleanness of the molten steel is improved, the production cost is reduced and the quality of the ultra-low-carbon steel is obviously improved.
Description
Technical field
The invention belongs to ultra low-carbon steel process for processing technical field, more particularly, relate to a kind of process method that reduces ultra low-carbon steel RH decarburization terminal point oxygen level.
Background technology
At present, ultra low carbon IF steel has become the deep-draw of third generation automobile and has used steel.Owing to adopt the RH vacuum refinement can the carbon in the molten steel [C], nitrogen [N] content be controlled at respectively below the 25ppm, carbon [C] content even can reduce to lower wherein.Simultaneously, owing to added the titanium [Ti] or [Nb] microalloy element of etc.ing in the ultra low-carbon steel, combine the formation carbonitride with carbon [C], nitrogen [N] interstitial atom in the steel; Become gapless atomic steel, thereby make material not have aging phenomenon, in addition; Because adopt the design of ultralow-carbon composition, the tissue of Finished Steel all is a ferritic, therefore; Ultra low-carbon steel has better drawing performance, is widely used in the component that high formabilities such as the complicated stamping in the automobile, outer wrapper plate can require.In view of the special significance of ultra low-carbon steel steel auto sheet, it has become one of principal item of automotive sheet.
See that from the material design point of view carbon in the ultra low-carbon steel, nitrogen interstitial atom and inclusion content should be controlled in the extremely low scope, prolong plasticity, deep drawing quality, non-ageing and favorable surface quality with what guarantee material.Adopt " converter-alloy fine setting station-RH-continuous casting " when operational path is produced ultra low-carbon steel in the prior art; Because converter terminal C, T and [0] are difficult to coordinate control, the ladle top slag oxidisability is higher, molten steel activity oxygen shows two characteristics when the RH vacuum decarburization finishes: instability between (1) stove and the stove; (2) the activity oxygen level is high, between 300ppm-800ppm.This had both increased the consumption of the deoxidation aluminum shot of RH vacuum refinement operation, thereby caused cost to rise, and the inclusion that has produced in the molten steel when having increased deoxidation again influences the molten steel cleanliness factor.
Summary of the invention
Technical problem to be solved by this invention is: to the deficiency of prior art; Provide a kind of and can reduce RH vacuum decarburization terminal point oxygen level; Reduce the molten steel inclusion content; Improve the molten steel cleanliness factor, the process method of the reduction ultra low-carbon steel RH vacuum decarburization terminal point oxygen level that can reduce production costs again.
Solve above-described technical problem, the technical scheme that the present invention takes is:
The present invention is a kind of process method that reduces ultra low-carbon steel RH vacuum decarburization terminal point oxygen level, comprises first steel-making water is carried out RH vacuum decarburization treatment step, and the step of described process method is:
1) handles early stage at the RH vacuum decarburization, in Vakuumkammer, add the pollution-free deoxidizing agent, remove partial oxygen in the steel by feed bin; 2) further reduce the vacuum tightness of Vakuumkammer, carry out dark decarburization; 3) after the processing of RH vacuum decarburization finishes, with aluminum shot as end-deoxidizer.
Described RH vacuum decarburization is handled early stage, by feed bin adds the pollution-free deoxidizing agent in Vakuumkammer time, is controlled at the RH vacuum decarburization and handles after the beginning in 3-8 minute.
Before described molten steel carried out the processing of RH vacuum decarburization, the initial carbon content of molten steel was controlled between the 0.02%-0.06%, and initial oxygen content is controlled between the 400-1000ppm, and the initial temperature of molten steel is controlled between 1580-1630 ℃.
After adding the completion of aluminum shot reductor in the molten steel in described steel melting furnace, in molten steel, add Ti or Nb alloy again.
Described RH vacuum decarburization is handled early stage, and the add-on of pollution-free deoxidizing agent is between 0.05kg/ ton steel-0.4kg/ ton steel, and concrete add-on is confirmed by computation model.
Described RH vacuum decarburization is handled early stage, and the granularity requirements of the pollution-free deoxidizing agent of in molten steel, adding is controlled at 1-6mm, and the volatile quantity of pollution-free deoxidizing agent requires less than 2.5%.
When reducing in the RH stove vacuum tightness and carrying out dark decarburization, described vacuum degree control remains to the processing of RH vacuum decarburization and finishes below 1.5mbar.
Adopt technical scheme of the present invention, can obtain following beneficial effect:
The process method of reduction ultra low-carbon steel RH vacuum decarburization terminal point oxygen level of the present invention; Can significantly reduce the activity oxygen level of ultra low-carbon steel when the RH decarburization finishes, and can stablize and be controlled between the 250-400ppm, reduce inclusion content; Improve the molten steel cleanliness factor, can reduce production costs again.After process method of the present invention was implemented aborning, the molten steel oxygen level when the RH vacuum decarburization finishes was reduced to 341ppm (MV) by original 517ppm (MV).Wherein, less than the heat ratio of 400ppm, bring up to 87.3% by original 27.2%.Reduce ton steel aluminium consumption, improved the quality of production of ultra low-carbon steel.
Description of drawings
The mark of facing down among expressed content of each accompanying drawing of this specification sheets and the figure is made briefly bright:
Fig. 1 is the schematic flow sheet of the process method of reduction ultra low-carbon steel RH vacuum decarburization terminal point oxygen level of the present invention;
Embodiment
Contrast accompanying drawing below; Through the description to embodiment, the effect of mutual alignment between the shape of specific embodiments of the invention such as related each member, structure, the each several part and annexation, each several part and principle of work etc. are done further to specify:
Shown in accompanying drawing 1; The present invention is a kind of process method that reduces ultra low-carbon steel RH vacuum decarburization terminal point oxygen level; Comprise first steel-making water is carried out RH vacuum decarburization treatment step, it is characterized in that: the step of the process method of described reduction ultra low-carbon steel RH vacuum decarburization terminal point oxygen level is:
1) handles early stage at the RH vacuum decarburization, in Vakuumkammer, add the pollution-free deoxidizing agent, remove partial oxygen in the steel by feed bin; 2) vacuum tightness that further reduces Vakuumkammer is carried out dark decarburization; 3) after the processing of RH vacuum decarburization finishes, with aluminum shot as end-deoxidizer.
Described RH vacuum decarburization is handled early stage, by feed bin adds the pollution-free deoxidizing agent in Vakuumkammer time, is controlled at the RH vacuum decarburization and handles after the beginning in 3-8 minute.
Before described molten steel carried out the processing of RH vacuum decarburization, the initial carbon content of molten steel was controlled between the 0.02%-0.06%, and initial oxygen content is controlled between the 400-1000ppm, and the initial temperature of molten steel is controlled between 1580-1630 ℃.
Process method of the present invention span of control to the initial carbon content of molten steel, initial oxygen content, initial temperature before carrying out the RH vacuum-treat is more wide in range; Its reason is; Adopt process method of the present invention; Can solve the deficiency that converter terminal C, T and [0] are difficult to coordinate the control aspect preferably, take into account the Financial cost of converter smelting, starting condition is being controlled at molten steel in above-mentioned scope best results when handling.
Described RH vacuum decarburization is handled the add-on of pollution-free deoxidizing agent in early stage between 0.05kg/ ton steel-0.4kg/ ton steel, and concrete add-on is confirmed by computation model.
When reducing the vacuum tightness in the RH stove of described molten steel, described vacuum degree control below 1.5mbar, reduce vacuum tightness after, remain to the processing of RH vacuum decarburization and finish.
Before described molten steel carried out the RH vacuum-treat, the initial carbon content of molten steel was between 0.028%-0.04%, and initial oxygen content is between 600-900ppm, and the initial temperature of molten steel is between 1600-1650 ℃.
Adopt process method of the present invention, behind the dark carbonization treatment 12-15min of completion RH vacuum, the activity oxygen in the molten steel will be reduced to below the 400ppm.
The process method of reduction ultra low-carbon steel RH vacuum decarburization terminal point oxygen level of the present invention; Activity oxygen level when finishing through adopting free of contamination reductor to control the RH vacuum decarburization is between 250～400ppm; Thereby reduce the usage quantity of deoxidation aluminum shot, reduce the consumption of deoxidation aluminum shot, reduce the inclusion content in the molten steel; Improve the molten steel cleanliness factor, reduce production costs.After process method of the present invention is implemented, can after the RH vacuum decarburization finishes, the oxygen level in the molten steel be reduced to 341ppm by initial 517ppm in actual production,, bring up to 87.3% by initial 27.2% wherein less than the heat ratio of 400ppm.Thereby obviously improved the quality of production of ultra low-carbon steel.
Combine accompanying drawing that the present invention has been carried out exemplary description above; Obviously the concrete realization of the present invention does not receive the restriction of aforesaid way; As long as the various improvement of having adopted method design of the present invention and technical scheme to carry out; Or design of the present invention and technical scheme are directly applied to other occasions without improving, all in protection scope of the present invention.
Claims (7)
1. process method that reduces ultra low-carbon steel RH vacuum decarburization terminal point oxygen level; Comprise first steel-making water is carried out RH vacuum decarburization treatment step; It is characterized in that: the step of the process method of described reduction ultra low-carbon steel RH vacuum decarburization terminal point oxygen level is: 1) handle early stage at the RH vacuum decarburization; In Vakuumkammer, add the pollution-free deoxidizing agent by feed bin, remove partial oxygen in the steel; 2) vacuum tightness that further reduces Vakuumkammer is carried out dark decarburization; 3) after the processing of RH vacuum decarburization finishes, with aluminum shot as end-deoxidizer.
2. the process method of reduction ultra low-carbon steel RH vacuum decarburization terminal point oxygen level according to claim 1; It is characterized in that: described RH vacuum decarburization is handled early stage; By feed bin adds the pollution-free deoxidizing agent in Vakuumkammer time, be controlled at the processing of RH vacuum decarburization and begin in back 3-8 minute.
3. the process method of reduction ultra low-carbon steel RH vacuum decarburization terminal point oxygen level according to claim 2; It is characterized in that: before described molten steel carries out the processing of RH vacuum decarburization; The initial carbon content of molten steel is controlled between the 0.02%-0.06%; Initial oxygen content is controlled between the 400-1000ppm, and the initial temperature of molten steel is controlled between 1580-1630 ℃.
4. according to the process method of claim 1 or 2 or 3 described reduction ultra low-carbon steel RH vacuum decarburization terminal point oxygen levels, it is characterized in that: after adding the completion of aluminum shot reductor in the molten steel in described steel melting furnace, in molten steel, add Ti or Nb alloy again.
5. the process method of reduction ultra low-carbon steel RH vacuum decarburization terminal point oxygen level according to claim 4 is characterized in that: described RH vacuum decarburization is handled early stage, and the add-on of pollution-free deoxidizing agent is between 0.05kg/ ton steel-0.4kg/ ton steel.
6. the process method of reduction ultra low-carbon steel RH vacuum decarburization terminal point oxygen level according to claim 5; It is characterized in that: described RH vacuum decarburization is handled early stage; The granularity of the pollution-free deoxidizing agent of in molten steel, adding is between 1～6mm, and the volatile quantity of pollution-free deoxidizing agent is less than 2.5%.
7. the process method of reduction ultra low-carbon steel RH vacuum decarburization terminal point oxygen level according to claim 6; It is characterized in that: when reducing in the RH stove vacuum tightness and carrying out dark decarburization; Described vacuum degree control remains to the processing of RH vacuum decarburization and finishes below 1.5mbar.
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Cited By (7)
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| TWI588264B (en) * | 2016-07-28 | 2017-06-21 | 中國鋼鐵股份有限公司 | Method of decarbonizing molten steel for reducing molten steel splash |
| CN106191376B (en) * | 2016-08-24 | 2018-07-24 | 武汉钢铁有限公司 | Ultra-low carbon aluminum killed steel vacuum adds carbon pre-deoxidizing technology |
| CN111876669A (en) * | 2020-06-29 | 2020-11-03 | 阳春新钢铁有限责任公司 | Control method of process for smelting low-carbon steel by converter |
| CN112063792A (en) * | 2020-09-09 | 2020-12-11 | 鞍钢股份有限公司 | Method for stably controlling converter terminal low oxygen value |
| CN113490755A (en) * | 2019-03-13 | 2021-10-08 | 杰富意钢铁株式会社 | Method for producing ultra-low carbon steel containing Ti |
| CN115505819A (en) * | 2022-08-31 | 2022-12-23 | 马鞍山钢铁股份有限公司 | Production method of high-fracture-toughness medium-high carbon steel |
| CN115572784A (en) * | 2022-10-21 | 2023-01-06 | 重庆钢铁股份有限公司 | Method for controlling carbon content of ultra-low carbon steel and production method of ultra-low carbon steel |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| TWI588264B (en) * | 2016-07-28 | 2017-06-21 | 中國鋼鐵股份有限公司 | Method of decarbonizing molten steel for reducing molten steel splash |
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| CN112063792A (en) * | 2020-09-09 | 2020-12-11 | 鞍钢股份有限公司 | Method for stably controlling converter terminal low oxygen value |
| CN115505819A (en) * | 2022-08-31 | 2022-12-23 | 马鞍山钢铁股份有限公司 | Production method of high-fracture-toughness medium-high carbon steel |
| CN115505819B (en) * | 2022-08-31 | 2023-08-25 | 马鞍山钢铁股份有限公司 | Production method of medium-high carbon steel with high fracture toughness |
| CN115572784A (en) * | 2022-10-21 | 2023-01-06 | 重庆钢铁股份有限公司 | Method for controlling carbon content of ultra-low carbon steel and production method of ultra-low carbon steel |
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Application publication date: 20120919 |