CN105331764A - Direct-supply RH refining method for smelting SS400 steel grade through 210t converter - Google Patents

Direct-supply RH refining method for smelting SS400 steel grade through 210t converter Download PDF

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Publication number
CN105331764A
CN105331764A CN201510724011.9A CN201510724011A CN105331764A CN 105331764 A CN105331764 A CN 105331764A CN 201510724011 A CN201510724011 A CN 201510724011A CN 105331764 A CN105331764 A CN 105331764A
Authority
CN
China
Prior art keywords
steel
slag
ferro
converter
aluminum powder
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN201510724011.9A
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Chinese (zh)
Inventor
王建林
王宏盛
武晓晶
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Baotou Iron and Steel Group Co Ltd
Inner Mongolia Baotou Steel Union Co Ltd
Original Assignee
Baotou Iron and Steel Group Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Baotou Iron and Steel Group Co Ltd filed Critical Baotou Iron and Steel Group Co Ltd
Priority to CN201510724011.9A priority Critical patent/CN105331764A/en
Publication of CN105331764A publication Critical patent/CN105331764A/en
Pending legal-status Critical Current

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Classifications

    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21CPROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C5/00Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
    • C21C5/28Manufacture of steel in the converter
    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21CPROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C7/00Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
    • C21C7/0006Adding metallic additives
    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21CPROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C7/00Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
    • C21C7/0037Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00 by injecting powdered material
    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21CPROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C7/00Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
    • C21C7/0056Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00 using cored wires
    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21CPROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C7/00Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
    • C21C7/04Removing impurities by adding a treating agent
    • C21C7/06Deoxidising, e.g. killing
    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21CPROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C7/00Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
    • C21C7/10Handling in a vacuum

Abstract

The invention discloses a direct-supply RH refining method for smelting the SS400 steel grade through a 210t converter. Through converter carbon catching, the carbon is controlled to range from 0.05% to 0.10%, the temperature inside a tank is controlled to range from 1620 DEG C to 1630 DEG C, and in the tapping process, deoxygenation and top slag improvement are carried out; RH vacuum degassing, alloying and degassing are carried out on molten steel, and aluminum and iron powder with the diameter ranging from 3mm to 5mm is automatically and evenly scattered on a steel ladle slag liquid face from a feeding position aluminum and iron powder storage hopper; the adding amount of steel is 0.5/t, and after the aluminum and iron power is added, a calcium-silicon alloy with 0.536kg/t steel is fed into a steel ladle; and the aluminum and iron powder is fully dissolved into slag to achieve the aim that free oxygen in the slag is prevented from entering the molten steel. Converter molten steel is directly treated at the RH refining position without passing through LF refining, and electric energy and non-metallic material consumption are greatly saved.

Description

A kind of 210t converter smelting SS400 steel grade direct-furnish RH purifying method
Technical field
The present invention relates to RH refining field of steel-making, particularly relate to the method for a kind of converter direct-furnish RH refining.
Background technology
It is arrive the casting of CSP casting machine after molten steel being hung LF refining by crane again that converter has gone out the former technical process of steel.Carbon is controlled temperature in 0.05-0.10%, tank and controls to carry out deoxidation alloying more than 1550 DEG C, in tapping process and carry out top slag upgrading by converter catch carbon.Because converter top slag upgrading is all carry out in the tapping later stage, easily causes modification agent to melt insufficient, go out the ready-made phenomenon that sticks together, and gone out steel and do not allow large argon gas to stir otherwise cross the temperature of RH to ensure, do not reach the ideal effect of top slag upgrading.
Arrive casting machine again after the siliceous steel grades such as current domestic most steel mill converter smelting SS400 are all through LF refining to cast, the method of the molten steel and top slag upgrading of deoxidation be nearly all before RH process or process terminate after add spherical top slag modifier, its effect is undesirable and cost is higher.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of 210t converter smelting SS400 steel grade direct-furnish RH purifying method, reduces production cost, improves Molten Steel Cleanliness and economic benefit.
For reaching above-mentioned purpose, a kind of 210t converter smelting of the present invention SS400 steel grade direct-furnish RH purifying method, comprises the following steps:
The first step, converter catch carbon, by carbon content control at 0.05-0.10%, in tank, temperature controls at 1620-1630 DEG C, carries out deoxidation and carry out top slag upgrading in tapping process;
Second step, molten steel is in RH vacuum outgas and after carrying out alloying, degassed end, by diameter 3-5mm ferro-aluminum powder from feed silk position ferro-aluminum powder storage hopper automatic uniform be sprinkling upon ladle slag liquid level, add-on is 0.5/t. steel, described ferro-aluminum powder storage hopper is an automatic weighing hopper being positioned at that square shape on dust excluding hood is back taper, add ferro-aluminum powder again to the silico-calcium cored-wire of ladle feeding 0.536kg/t steel, impel ferro-aluminum powder fully to dissolve in slag to reach the Al avoiding free oxygen in slag to enter minute quantity in molten steel and sex change steel 2o 3the object be mingled with.
The composition of wherein said ferro-aluminum powder is aluminium content 47, and rest part is iron powder.
The invention difference from existing technology is that the present invention achieves following technique effect:
Converter molten steel of the present invention directly arrives RH refining without LF refining and processes, and greatly saves the consumption of electric energy and nonmetal material; Ferro-aluminum Powder Particle Size little Yi disperses, and comparatively top slag modifier light specific gravity, cost are low, is sprinkling upon ladle slag liquid level from feeding silk position ferro-aluminum powder storage hopper automatic uniform, makes ferro-aluminum powder catch rapidly the Al of minute quantity in free oxygen and sex change steel in slag by Calcium treatment 2o 3be mingled with.Get slag ocean assay, ladle top slag dual alkalinity CaO/SiO 2all about 3.0, entire oxygen content in the steel and nitrogen are all at below 20ppm.
Embodiment
Below in conjunction with embodiment, to above-mentioned being described in more detail with other technical characteristic and advantage of the present invention.
Embodiment 1: technical process is after converter tapping, arrives the casting of CSP casting machine again after molten steel being hung LF refining by crane.Carbon is controlled temperature in 0.05-0.10%, tank and controls to carry out deoxidation alloying more than 1550 DEG C, in tapping process and carry out top slag upgrading by converter catch carbon.Because converter top slag upgrading is all carry out in the tapping later stage, easily causes modification agent to melt insufficient, go out the ready-made phenomenon that sticks together, and gone out steel and do not allow large argon gas to stir otherwise cross the temperature of RH to ensure, do not reach the ideal effect of top slag upgrading.
Embodiment 2: the first step, converter catch carbon carbon is controlled temperature in 0.05-0.10%, tank control 1620-1630 DEG C, carry out deoxidation alloying in tapping process and carry out top slag upgrading.Second step, molten steel is in RH vacuum outgas and after carrying out alloying, degassed end, and be sprinkling upon ladle slag liquid level by diameter 3-5mm ferro-aluminum powder from what feed silk position ferro-aluminum powder storage hopper automatic uniform, add-on is 0.5/t. steel.The composition of described ferro-aluminum powder is aluminium content 47, and rest part is iron powder.Described ferro-aluminum powder storage hopper is an automatic weighing hopper being positioned at that square shape on dust excluding hood is back taper.Add ferro-aluminum powder again to the silico-calcium cored-wire of ladle feeding 0.536kg/t steel, impel ferro-aluminum powder fully to dissolve in slag to reach the Al avoiding free oxygen in slag to enter minute quantity in molten steel and sex change steel 2o 3the object be mingled with.
For 210 tons of LF stoves and RH stove:
Table 1 is through LF refining treatment oxygen nitrogen sample and direct-furnish RH refining treatment oxygen nitrogen sample of offing normal of offing normal and contrasts:
Table 1
Table 2 is slag composition situations after direct-furnish RH liquid steel refining:
Direct-furnish RH refining slag specimen assay of offing normal is as follows:
Table 2
Note:
1, as can be seen from Table 1, after converter direct-furnish RH refining treatment, oxygen and nitrogen content is all low than the oxygen and nitrogen content after LF refining treatment.
2, as can be seen from Table 2, after the slag upgrading of converter direct-furnish RH refining top, full iron (TFe) content on average reduces 7.551%.
3, owing to can save the 9.6 yuan/t. such as electric energy, nonmetal material steel without LF refining, as calculated this method.
Above-described embodiment is only be described the preferred embodiment of the present invention; not scope of the present invention is limited; under not departing from the present invention and designing the prerequisite of spirit; the various distortion that those of ordinary skill in the art make technical scheme of the present invention and improvement, all should fall in protection domain that claims of the present invention determines.

Claims (2)

1. a 210t converter smelting SS400 steel grade direct-furnish RH purifying method, is characterized in that comprising the following steps:
The first step, converter catch carbon, by carbon content control at 0.05-0.10%, in tank, temperature controls at 1620-1630 DEG C, carries out deoxidation and carry out top slag upgrading in tapping process;
Second step, molten steel is in RH vacuum outgas and after carrying out alloying, degassed end, by diameter 3-5mm ferro-aluminum powder from feed silk position ferro-aluminum powder storage hopper automatic uniform be sprinkling upon ladle slag liquid level, add-on is 0.5/t. steel, described ferro-aluminum powder storage hopper is an automatic weighing hopper being positioned at that square shape on dust excluding hood is back taper, add ferro-aluminum powder again to the silico-calcium cored-wire of ladle feeding 0.536kg/t steel, impel ferro-aluminum powder fully to dissolve in slag to reach the Al avoiding free oxygen in slag to enter minute quantity in molten steel and sex change steel 2o 3the object be mingled with.
2. 210t converter smelting SS400 steel grade direct-furnish RH purifying method according to claim 1, is characterized in that: the composition of described ferro-aluminum powder is aluminium content 47, and rest part is iron powder.
CN201510724011.9A 2015-10-29 2015-10-29 Direct-supply RH refining method for smelting SS400 steel grade through 210t converter Pending CN105331764A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201510724011.9A CN105331764A (en) 2015-10-29 2015-10-29 Direct-supply RH refining method for smelting SS400 steel grade through 210t converter

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Application Number Priority Date Filing Date Title
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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20200075651A (en) * 2018-12-18 2020-06-26 주식회사 포스코 Refining method of high-purity molten steel

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102212747A (en) * 2011-06-03 2011-10-12 首钢总公司 Low-cost steel for automobile beam and manufacturing method thereof
CN102776329A (en) * 2012-07-13 2012-11-14 河北钢铁股份有限公司唐山分公司 Method for refining SS400 steel sheet with reduced aluminium consumption in ladle furnace
CN103937926A (en) * 2014-03-26 2014-07-23 江苏省沙钢钢铁研究院有限公司 Production method for ultralow-oxygen-content molten steel of ultralow-low-carbon steel
CN104805252A (en) * 2015-05-14 2015-07-29 内蒙古包钢钢联股份有限公司 Method for modifying silicon steel top slags

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102212747A (en) * 2011-06-03 2011-10-12 首钢总公司 Low-cost steel for automobile beam and manufacturing method thereof
CN102776329A (en) * 2012-07-13 2012-11-14 河北钢铁股份有限公司唐山分公司 Method for refining SS400 steel sheet with reduced aluminium consumption in ladle furnace
CN103937926A (en) * 2014-03-26 2014-07-23 江苏省沙钢钢铁研究院有限公司 Production method for ultralow-oxygen-content molten steel of ultralow-low-carbon steel
CN104805252A (en) * 2015-05-14 2015-07-29 内蒙古包钢钢联股份有限公司 Method for modifying silicon steel top slags

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20200075651A (en) * 2018-12-18 2020-06-26 주식회사 포스코 Refining method of high-purity molten steel
KR102168836B1 (en) 2018-12-18 2020-10-22 주식회사 포스코 Refining method of high-purity molten steel

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Application publication date: 20160217

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