CN108998733A - A kind of LF furnace roof slag method for modifying of conductive steel - Google Patents
A kind of LF furnace roof slag method for modifying of conductive steel Download PDFInfo
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- CN108998733A CN108998733A CN201810898686.9A CN201810898686A CN108998733A CN 108998733 A CN108998733 A CN 108998733A CN 201810898686 A CN201810898686 A CN 201810898686A CN 108998733 A CN108998733 A CN 108998733A
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/0087—Treatment of slags covering the steel bath, e.g. for separating slag from the molten metal
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/04—Removing impurities by adding a treating agent
- C21C7/06—Deoxidising, e.g. killing
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
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- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Mechanical Engineering (AREA)
- Analytical Chemistry (AREA)
- Treatment Of Steel In Its Molten State (AREA)
Abstract
The present invention relates to a kind of LF furnace roof slag method for modifying of conductive steel, the conductive steel uses the furnace outer refining process of LF furnace+VD furnace, and wherein LF furnace refining process is divided into following 3 steps, i.e. step 1: heating slugging；Step 2: stopping heating, aluminum steel section is added according to the oxygen content of molten steel and carries out deoxidation of molten steel operation, steel water oxygen level is 0.01%~0.02% at the end of control is smelted；Step 3: lime, fluorite and top slag modifier adjustment top slag is added, guarantees the content of FeO in the slag of top 3%~5%, can guarantee that pushing up slag and the oxygen content of molten steel balances at this time, without transmitting oxygen mutually；The present invention goes back the oxygen content in priority control molten steel and top slag and the oxygen content in middle cinder inclusion other than controlling steel oxygen content in water, guarantees molten steel and pushes up the oxygen content of slag in the reasonable scope, and then direct motion when guaranteeing molten steel continuous casting.
Description
Technical field
The present invention relates to the LF furnace roof slag method for modifying of steelmaking technical field more particularly to a kind of conductive steel.
Background technique
The chemical component for producing the conductive steel of conductive steel wire, conductive steel disc or conductive rod iron etc. is similar to ingot iron,
In process of production, usually use aluminum shot as deoxidier in steel making working procedure and refining procedure, aluminum shot occurs with the oxygen in molten steel
Reaction generates Al2O3It is mingled with, causes that wadding flow problem occurs when continuous casting, become the main bugbear of variety steel production.
By carrying out assay to wadding apoblema, main wadding stream object is Al2O3, there are mainly two types of Producing reasons: first is that
Molten steel is in smelting process, the Al of generation2O3Have little time to float in molten steel etc. dystectic non-metallic inclusion, bonding invests
Mouth of a river inner wall forms dross；Second is that the Al generated by secondary oxidation due to molten steel2O3Contour melting point inclusions are adhered to mouth of a river inner wall
Form dross.
Summary of the invention
The present invention provides a kind of LF furnace roof slag method for modifying of conductive steel, also heavy other than controlling steel oxygen content in water
Point controls the oxygen content in molten steel and top slag and the oxygen content in middle cinder inclusion, guarantees molten steel and pushes up the oxygen content of slag in reasonable model
In enclosing, and then direct motion when guarantee molten steel continuous casting.
In order to achieve the above object, the present invention is implemented with the following technical solutions:
A kind of LF furnace roof slag method for modifying of conductive steel, the chemical component of the conductive steel is by mass percentage are as follows: and C≤
0.010%；Si≤0.010%；Mn≤0.06%；P≤0.015%；S≤0.010%；N≤0.0040%；Remaining is for iron and not
Evitable impurity；
The conductive steel uses the furnace outer refining process of LF furnace+VD furnace, and wherein LF furnace refining process is divided into following 3 steps
It is rapid:
Step 1: heating slugging；Put into 0.8~1.2kg/ tons of 3.5~4.5kg/ of lime tons of steel, fluorite steel, using electrode plus
Heat 10 minutes or more, while adjusting argon flow is that 150~200NL/min melts top slag；
Step 2: stopping heating, adjustment argon flow is 200~250NL/min, while 1.3~1.5kg/ tons of steel aluminium are added
Line segment stirs 3~5 minutes, measures molten steel oxygen value using apparatus for determination of oxygen；Aluminum steel section, which is continuously added, according to the oxygen content of molten steel carries out steel
Water deoxygenation operation, steel oxygen content in water is 0.01%~0.02% at the end of control is smelted；
Step 3: lime, fluorite and top slag modifier adjustment top slag is added, fluorite additional amount is 0.7~1.3kg/ tons of steel,
The additional amount of lime is 3~4 times of fluorite, and top slag modifier is added according to 1.3~1.7kg/ tons of steel；Adjusting argon flow is
150~200NL/min, weak stirring 3~5 minutes are sampled chemical examination, and the content of FeO is 3%~5% in the slag of guarantee top, at this time
It can guarantee that pushing up slag and the oxygen content of molten steel balances, without transmitting oxygen mutually；Heated by electrodes heating, reaches LF after tapping temperature
Furnace smelting process terminates, and molten steel turns VD furnace and carries out next step vacuum metling.
The top slag modifier is spherical Al slag.
Compared with prior art, the beneficial effects of the present invention are:
After the method for the invention, it is big nonmetal inclusion content in steel has been prevented when billet production conductive steel substantially
Problem, when producing such steel grade, the castability of molten steel is significantly improved, and cc billet surface quality is also greatly improved, and is not dropped
Speed, disconnected situations such as pouring.
Specific embodiment
The chemical component of a kind of LF furnace roof slag method for modifying of conductive steel of the present invention, the conductive steel presses quality percentage
Than are as follows: C≤0.010%；Si≤0.010%；Mn≤0.06%；P≤0.015%；S≤0.010%；N≤0.0040%；Remaining
For iron and inevitable impurity；
The conductive steel uses the furnace outer refining process of LF furnace+VD furnace, and wherein LF furnace refining process is divided into following 3 steps
It is rapid:
Step 1: heating slugging；Put into 0.8~1.2kg/ tons of 3.5~4.5kg/ of lime tons of steel, fluorite steel, using electrode plus
Heat 10 minutes or more, while adjusting argon flow is that 150~200NL/min melts top slag；
Step 2: stopping heating, adjustment argon flow is 200~250NL/min, while 1.3~1.5kg/ tons of steel aluminium are added
Line segment stirs 3~5 minutes, measures molten steel oxygen value using apparatus for determination of oxygen；Aluminum steel section, which is continuously added, according to the oxygen content of molten steel carries out steel
Water deoxygenation operation, steel oxygen content in water is 0.01%~0.02% at the end of control is smelted；
Step 3: lime, fluorite and top slag modifier adjustment top slag is added, fluorite additional amount is 0.7~1.3kg/ tons of steel,
The additional amount of lime is 3~4 times of fluorite, and top slag modifier is added according to 1.3~1.7kg/ tons of steel；Adjusting argon flow is
150~200NL/min, weak stirring 3~5 minutes are sampled chemical examination, and the content of FeO is 3%~5% in the slag of guarantee top, at this time
It can guarantee that pushing up slag and the oxygen content of molten steel balances, without transmitting oxygen mutually；Heated by electrodes heating, reaches LF after tapping temperature
Furnace smelting process terminates, and molten steel turns VD furnace and carries out next step vacuum metling.
The top slag modifier is spherical Al slag.
In the smelting process of conventional steel grade, the oxygen content in molten steel is usually controlled, and conductive steel of the present invention is
A kind of more special steel grade is limited by its molten steel characteristic, and in continuous casting, molten steel needs to keep certain oxygen content
(0.002%~0.004%), therefore the present invention is in LF refining furnace process, in addition to controlling the oxygen content in molten steel,
Reasonable control also has been carried out to the oxygen content of top slag.
Because oxygen content of the molten steel in smelting process is relatively high, so top slag can also contain higher oxygen before not modifying
Content, oxygen can be transmitted into molten steel by pushing up slag during molten steel subsequent smelting and continuous casting, can make steel oxygen content in water can not
Control, to react to form wadding stream object Al with the residual Al in molten steel2O3, eventually lead to continuous casting process wadding stream.It is comprehensive
The above reason, the present invention, which is used, modifies top slag in LF refining furnace
Argon gas is cooperated to control in the slag upgrading processes of top, that is, the heating thawing top slag stage that is powered wants suitable control argon gas stream
Amount is medium flow less than normal, and specific flow is 150~200NL/min；Argon gas is transferred to moderate strength after slugging, carries out addition aluminium
Line segment carries out deoxidation to molten steel, and specific flow is 200~250NL/min；The top slag modification stage turns argon gas down, and specific flow is
150~200NL/min promotes inclusion floating while guaranteeing top slag modification effect.
Following embodiment is implemented under the premise of the technical scheme of the present invention, gives detailed embodiment and tool
The operating process of body, but protection scope of the present invention is not limited to following embodiments.Method therefor is such as without spy in following embodiments
Not mentionleting alone bright is conventional method.
[embodiment]
When producing conductive steel, Metal Weight is 100 tons in tank；LF furnace refining process is divided into three phases: first stage liter
Warm slugging, put into lime 400kg, fluorite 100kg, electrode electrified regulation 10 minutes；Adjusting argon flow simultaneously is 180NL/min
Melt top slag；Second stage stops heating, adjustment argon gas to 250NL/min, while 147kg aluminum steel section is added, and stirs 3 minutes,
Measuring molten steel oxygen value using apparatus for determination of oxygen when observation top slag color becomes black is 0.018%；Phase III addition 280kg lime,
70kg fluorite and 150kg top slag modifier are adjusted top slag, and adjustment argon flow is 170NL/min, and weak stirring 3 minutes is seen
It examines and chemical examination is sampled to top slag when top slag color is black gray expandable, FeO content is 4.3% in the slag of result of laboratory test display top；According to
Liquid steel temperature situation was heated up by heated by electrodes 10 minutes, liquid steel temperature is made to reach tapping temperature, and LF furnace smelting process terminates,
Molten steel is transferred to the vacuum metling that VD furnace carries out next step.
Conductive steel after above-mentioned external refining process, in continuous casting, entire casting process is very smooth；By repeatedly real
Shi Hou illustrates that technical solution of the present invention is feasible without generation wadding flow problem, can be in the process of billet production conductive steel
Middle application.
The foregoing is only a preferred embodiment of the present invention, but scope of protection of the present invention is not limited thereto,
Anyone skilled in the art in the technical scope disclosed by the present invention, according to the technique and scheme of the present invention and its
Inventive concept is subject to equivalent substitution or change, should be covered by the protection scope of the present invention.
Claims (2)
1. a kind of LF furnace roof slag method for modifying of conductive steel, which is characterized in that the chemical component of the conductive steel presses quality percentage
Than are as follows: C≤0.010%；Si≤0.010%；Mn≤0.06%；P≤0.015%；S≤0.010%；N≤0.0040%；Remaining
For iron and inevitable impurity；
The conductive steel uses the furnace outer refining process of LF furnace+VD furnace, and wherein LF furnace refining process is divided into following 3 steps:
Step 1: heating slugging；0.8~1.2kg/ tons of 3.5~4.5kg/ of lime tons of steel, fluorite steel are put into, heated by electrodes 10 is utilized
Minute or more, while adjusting argon flow is that 150~200NL/min melts top slag；
Step 2: stopping heating, adjustment argon flow is 200~250NL/min, while 1.3~1.5kg/ tons of steel-aluminium conductors are added
Section stirs 3~5 minutes, measures molten steel oxygen value using apparatus for determination of oxygen；Aluminum steel section, which is continuously added, according to the oxygen content of molten steel carries out molten steel
Deoxidation operation, steel oxygen content in water is 0.01%~0.02% at the end of control is smelted；
Step 3: lime, fluorite and top slag modifier adjustment top slag is added, fluorite additional amount is 0.7~1.3kg/ tons of steel, lime
Additional amount be 3~4 times of fluorite, top slag modifier is added according to 1.3~1.7kg/ tons of steel；Adjust argon flow be 150~
200NL/min, weak stirring 3~5 minutes, is sampled chemical examination, guarantees that the content of FeO in the slag of top 3%~5%, at this time can
Guarantee that the oxygen content of top slag and molten steel balances, without transmitting oxygen mutually；Heated by electrodes heating, reaches LF furnace smelting after tapping temperature
Refining process terminates, and molten steel turns VD furnace and carries out next step vacuum metling.
2. a kind of LF furnace roof slag method for modifying of conductive steel according to claim 1, which is characterized in that the top slag modification
Agent is spherical Al slag.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810898686.9A CN108998733B (en) | 2018-08-08 | 2018-08-08 | LF furnace top slag modification method of conductive steel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810898686.9A CN108998733B (en) | 2018-08-08 | 2018-08-08 | LF furnace top slag modification method of conductive steel |
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| CN108998733A true CN108998733A (en) | 2018-12-14 |
| CN108998733B CN108998733B (en) | 2020-06-23 |
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| CN201810898686.9A Active CN108998733B (en) | 2018-08-08 | 2018-08-08 | LF furnace top slag modification method of conductive steel |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111505235A (en) * | 2020-04-30 | 2020-08-07 | 辽宁科技大学 | Method for measuring interface oxygen transfer rate in process of smelting high-temperature alloy |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107794345A (en) * | 2016-09-06 | 2018-03-13 | 鞍钢股份有限公司 | A kind of LF stoves produce the secondary slag practice of low silicon aluminium killed steel |
-
2018
- 2018-08-08 CN CN201810898686.9A patent/CN108998733B/en active Active
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107794345A (en) * | 2016-09-06 | 2018-03-13 | 鞍钢股份有限公司 | A kind of LF stoves produce the secondary slag practice of low silicon aluminium killed steel |
Non-Patent Citations (1)
| Title |
|---|
| 苏小利等: "连铸水口堵塞、絮流原因分析及预防措施", 《第十届中国钢铁年会暨第六届宝钢学术年会论文集》 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111505235A (en) * | 2020-04-30 | 2020-08-07 | 辽宁科技大学 | Method for measuring interface oxygen transfer rate in process of smelting high-temperature alloy |
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