CN107828938B - A method of preventing the cold steel bonding of RH vacuum circulation degassing process vacuum tank - Google Patents
A method of preventing the cold steel bonding of RH vacuum circulation degassing process vacuum tank Download PDFInfo
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- CN107828938B CN107828938B CN201610823684.4A CN201610823684A CN107828938B CN 107828938 B CN107828938 B CN 107828938B CN 201610823684 A CN201610823684 A CN 201610823684A CN 107828938 B CN107828938 B CN 107828938B
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- decarburization
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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
- C21C7/10—Handling in a vacuum
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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
- C21C7/0006—Adding metallic additives
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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
- C21C7/04—Removing impurities by adding a treating agent
- C21C7/06—Deoxidising, e.g. killing
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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
- C21C7/04—Removing impurities by adding a treating agent
- C21C7/064—Dephosphorising; Desulfurising
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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
- C21C7/04—Removing impurities by adding a treating agent
- C21C7/068—Decarburising
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Treatment Of Steel In Its Molten State (AREA)
Abstract
The present invention provides a kind of method for preventing the cold steel bonding of RH vacuum circulation degassing process vacuum tank.The method comprise the steps that (1) ladle is using subcontracting in normal week, the turnaround time was less than 60 minutes；(2) molten steel is greater than 1600 DEG C greater than 1620 DEG C, the control of unskilled steel coolant-temperature gage into the control of RH furnace deoxidation liquid steel temperature；(3) RH refining furnace OB heating or OB force vacuum degree 5-15kpa, recycle stream stream 1400NL/min in decarburization time slot；(4) 5min circulation gas flow controls 1600 NL/min, 5min to 2000 NL/min of decarburization closure ring flow gas flow control before the decarburization of RH refining furnace；(5) after aluminium deoxidation 3min being added into molten steel, other alloys are added；(6) desulfurizing agent 200kg is added after molten steel alloying；(7) upper slot, hot-bending pipe temperature, top gun gun bit 8.5m, gas flow 200Nm are improved using top gun heating3/ h, 220 Nm of oxygen flow 3/h；(8) molten steel pure degassing circulation time is greater than 8min, and processing terminate.The present invention can effectively prevent cold steel bonding in vacuum tank, improve RH furnace operating rate.
Description
Technical field:
The present invention relates to a kind of methods for preventing the cold steel bonding of RH vacuum circulation degassing process vacuum tank, belong to steel-smelting technology
Field.
Background technique:
RH vacuum deaeration refining method be Rule company (Ruhrstahl) as belonging to Thyssen company (Tyssen) and
Extra large Lars company (Heraeus) has succeeded in developing vacuum molten steel circulation degassing method jointly, two companies with the name of its company by this
Kind of molten steel refining method is named as RH vacuum deaeration refining method, and this method can be such that in molten steel [O], [N] further decreases, for pair
The smelting of the high steel grade of molten steel composition cleanliness.RH vacuum degassing furnace has become the indispensable technique of high-end product, especially ultralow
Carbon steel kind is smelted.
In existing production technology, molten steel in Vacuum Degassing Process molten steel it is a large amount of splashing and cause cold steel to be largely adhered to
Cell wall glues cold steel situation in slot, can generally be observed by being set to the itv camera machine in groove top portion, in operating clearance, operation
Work directly can also directly confirm from camera hole.Multi-functional blowing top gun is utilized when gathering cold steel amount and reaching 1/3 slot inner cavity,
Production gap carries out the baking of coal oxygen and releases.The cold steel technique major defect of this removing has: during necessary blowing out, influencing normally to produce
Operation, baking must arrange molten steel washing trough operation after releasing, washing trough liquid steel temperature, ingredient are difficult to control after long-time is toasted
System.
The discovery of patent searching file, Chinese Patent Application No.: cold steel after a kind of RH vacuum refining of CN201520078044.6
Automatic processing device is to utilize cold steel in the mandatory mechanical removal vacuum tank of hydraulic push rod using manipulator；This method exists
Following problems:
This method is mainly used for removing the cold steel formed in vacuum tank, not can effectively prevent the formation of cold steel.
This method goes the cold steel time to be in blowing out state in RH vacuum refining furnace, is blown into purity oxygen and cold steel using top gun
Iron oxide, which carries out exothermic reaction, influences the operating rate of RH vacuum refining furnace to remove cold steel in vacuum tank.
In slot after cold steel removal, since dip pipe and exterior space contact, removes cold steel rear portion remnants and be adsorbed on leaching
Stain inside pipe wall, it is necessary to just can be carried out normal process production after molten steel washing trough.
Chinese Patent Application No.: a kind of 201110403471.3 patents of method for controlling slag bonding of vacuum chamber are disclosed in life
When producing IF steel, the pressure control of the stokehold RH 3min and medium carbon steel require to improve Tapping Temperature of Bof when smelting, and reduce RH furnace OB oxygen
Amount is to control slag bonding of vacuum chamber.This method reduces the formation of cold steel to a certain extent, but still has the following problems:
The aluminum oxide slag inclusion that RH furnace OB heating and decarburization terminal aluminium deoxidation generate will necessarily some attachment dipping
Inside pipe wall influences molten steel reflux ladle, dipping bore is caused to become smaller, and in pipe and slot bottom gathers cold steel.
Molten steel, since molten steel splashes, necessarily has part molten steel and is attached to hot-bending pipe and top during deoxidation alloying
In groove groove wall, ladle can not be flowed back into, may eventually form cold steel, influences normally to produce.
A kind of Chinese Patent Application No.: 201110180578.6 patent disclosures of the method for the online removal cold steel of RH vacuum chamber
Cold steel is removed using top gun oxygen blowing method online during RH handles molten steel, this method makes full use of processing boiling steel process not
The second-time burning of completely burned product CO acts on, and heats to vacuum tank inner wall, while can also handle molten steel knot using RH
Cold steel is removed using top gun injecting oxygen method online at once after beam.This method can reduce middle and upper part to a certain extent
The formation of the cold steel of slot, but still have the following problems:
This method is equally used for the cold steel formed in removal vacuum tank, not can effectively prevent the formation of cold steel.
It, will necessarily shadow using carbon period imperfect combustion product CO and the oxygen second-time burning heating, vacuum slot inner wall being blown into
The rapid decrease of vacuum degree is rung, this affects decarbonization rate and depth to a certain extent.
It does not control effectively, will necessarily lead to cold steel formation influence factor recycle stream flow, alloy addition opportunity
The formation of refrigeration steel.
Summary of the invention
The purpose of the present invention is provide one kind in view of the above problems to prevent RH vacuum circulation degassing process vacuum tank
The method of cold steel bonding can effectively prevent cold steel bonding in vacuum tank, improve RH furnace operating rate, prevent molten steel after cold steel fusing
Temperature, ingredient are difficult to control problem.
Above-mentioned purpose is achieved through the following technical solutions:
A method of the cold steel bonding of RH vacuum circulation degassing process vacuum tank is prevented, method includes the following steps:
(1) ladle is using subcontracting in normal week, and the turnaround time was less than 60 minutes；
(2) molten steel is greater than 1600 DEG C greater than 1620 DEG C, the control of unskilled steel coolant-temperature gage into the control of RH furnace deoxidation liquid steel temperature；
(3) RH refining furnace OB heating or OB force vacuum degree 5-15kpa, recycle stream stream 1400NL/ in decarburization time slot
min；
(4) 5min circulation gas flow controls 1600 NL/min before the decarburization of RH refining furnace, and 5min to decarburization terminates circulation
It measures gas flow and controls 2000 NL/min；
(5) after aluminium deoxidation 3min being added into molten steel, other alloys are added；
(6) desulfurizing agent 200kg is added after molten steel alloying；
(7) upper slot, hot-bending pipe temperature, top gun gun bit 8.5m, 200 Nm of gas flow are improved using top gun heating 3/h、
220 Nm of oxygen flow 3/h；
(8) molten steel pure degassing circulation time is greater than 8min, and processing terminate.
The method for preventing the cold steel bonding of RH vacuum circulation degassing process vacuum tank, molten steel described in step (2)
Oxygen content is 550ppm.
The utility model has the advantages that
The present invention from control ladle state, subcontracted using normal week, guarantee red packet tapping and molten steel primary condition molten steel into
The control of RH furnace deoxidation liquid steel temperature is greater than 1600 DEG C greater than 1620 DEG C, the control of unskilled steel coolant-temperature gage, Oxygen Content in Liquid Steel 450ppm-
650ppm sets about, and reduces RH vacuum drying oven OB oxygen amount, reduces alchlor attachment blocking dip pipe.
Control OB heating forces vacuum degree, recycle stream flow when decarburization that splash can be effectively prevented, and reduces cold steel
It is formed.
Decarburization Circulation of Preceding gas flow is controlled, the splash of carbon oxygen vigorous reaction can be slowed down.
It using top gun heating function, heats up after deoxidation to hot-bending pipe and upper slot, promotes molten steel reflux ladle.
Using the present invention, cold steel attachment is not had in entire treatment process vacuum tank, simultaneously because adding after deoxidation alloying
The desulfurizing agent entered effectively adsorbs deoxidation products, guarantees to carry out dip pipe caliber, while improving Molten Steel Cleanliness.
Specific embodiment
With reference to embodiment, the present invention is furture elucidated, it should be understood that following specific embodiments are only used for
It is bright the present invention rather than limit the scope of the invention.
The method that the present invention prevents the cold steel bonding of RH vacuum circulation degassing process vacuum tank, method includes the following steps:
(1) ladle is using subcontracting in normal week, and the turnaround time was less than 60 minutes；
(2) molten steel is greater than 1600 DEG C greater than 1620 DEG C, the control of unskilled steel coolant-temperature gage into the control of RH furnace deoxidation liquid steel temperature；
(3) RH refining furnace OB heating or OB force vacuum degree 5-15kpa, recycle stream stream 1400NL/ in decarburization time slot
min；
(4) 5min circulation gas flow controls 1600 NL/min before the decarburization of RH refining furnace, and 5min to decarburization terminates circulation
It measures gas flow and controls 2000 NL/min；
(5) after aluminium deoxidation 3min being added into molten steel, other alloys are added；
(6) desulfurizing agent 200kg is added after molten steel alloying；
(7) upper slot, hot-bending pipe temperature, top gun gun bit 8.5m, 200 Nm of gas flow are improved using top gun heating 3/h、
220 Nm of oxygen flow 3/h；
(8) molten steel pure degassing circulation time is greater than 8min, and processing terminate.
The method for preventing the cold steel bonding of RH vacuum circulation degassing process vacuum tank, molten steel described in step (2)
Oxygen content is 550ppm.
Those of ordinary skill in the art it should be appreciated that more than embodiment be intended merely to illustrate it is of the invention
Technical solution, and being not used as limitation of the invention, it is any based on connotation of the invention to embodiment described above
Made variation, modification will all be fallen in scope of protection of the claims of the invention.
Claims (2)
1. a kind of method for preventing the cold steel bonding of RH vacuum circulation degassing process vacuum tank, it is characterized in that: this method includes following
Step:
(1) ladle is using subcontracting in normal week, and the turnaround time was less than 60 minutes；
(2) molten steel is greater than 1600 DEG C greater than 1620 DEG C, the control of unskilled steel coolant-temperature gage into the control of RH furnace deoxidation liquid steel temperature；
(3) RH refining furnace OB heating or OB force vacuum degree 5-15kpa, recycle stream stream 1400NL/min in decarburization time slot；
(4) 5min circulation gas flow controls 1600 NL/min before the decarburization of RH refining furnace, and 5min to decarburization terminates circulation gas
2000 NL/min of body flow control；
(5) after aluminium deoxidation 3min being added into molten steel, other alloys are added；
(6) desulfurizing agent 200kg is added after molten steel alloying；
(7) upper slot, hot-bending pipe temperature, top gun gun bit 8.5m, 200 Nm of gas flow are improved using top gun heating 3/ h, oxygen
220 Nm of flow 3/h；
(8) molten steel pure degassing circulation time is greater than 8min, and processing terminate.
2. the method according to claim 1 for preventing the cold steel bonding of RH vacuum circulation degassing process vacuum tank, it is characterized in that:
Oxygen Content in Liquid Steel described in step (2) is 550ppm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610823684.4A CN107828938B (en) | 2016-09-15 | 2016-09-15 | A method of preventing the cold steel bonding of RH vacuum circulation degassing process vacuum tank |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610823684.4A CN107828938B (en) | 2016-09-15 | 2016-09-15 | A method of preventing the cold steel bonding of RH vacuum circulation degassing process vacuum tank |
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| Publication Number | Publication Date |
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| CN107828938A CN107828938A (en) | 2018-03-23 |
| CN107828938B true CN107828938B (en) | 2019-05-24 |
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| CN201610823684.4A Active CN107828938B (en) | 2016-09-15 | 2016-09-15 | A method of preventing the cold steel bonding of RH vacuum circulation degassing process vacuum tank |
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Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR102231570B1 (en) * | 2017-02-27 | 2021-03-25 | 닛폰세이테츠 가부시키가이샤 | Vacuum degassing tank diagnosis support device, diagnosis support method, diagnosis method and maintenance method |
| CN110438299B (en) * | 2019-09-02 | 2020-12-11 | 湖南华菱湘潭钢铁有限公司 | Method for removing cold steel slag in RH vacuum tank |
| CN110819768B (en) * | 2019-11-20 | 2021-11-09 | 马鞍山钢铁股份有限公司 | Method for improving RH vacuum grooving cold steel efficiency for low-carbon aluminum killed steel |
| CN111549203B (en) * | 2020-05-11 | 2021-10-26 | 首钢集团有限公司 | RH refining method for reducing temperature drop of molten steel and cold steel in vacuum chamber |
| CN111979377B (en) * | 2020-08-11 | 2022-07-12 | 大冶特殊钢有限公司 | Method for recycling RH vacuum tank cold steel by using high-temperature airflow |
| CN114703340B (en) * | 2022-03-14 | 2023-03-14 | 广东韶钢松山股份有限公司 | Method for reducing RH furnace and hot bent pipe junction cooling steel slag |
| 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 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102851456A (en) * | 2011-06-29 | 2013-01-02 | 鞍钢股份有限公司 | Method for online removing cold steel in RH vacuum chamber |
| CN103173588A (en) * | 2013-03-23 | 2013-06-26 | 鞍钢股份有限公司 | RH treatment method of low-silicon aluminum killed steel |
| CN104775007A (en) * | 2014-01-09 | 2015-07-15 | 宝山钢铁股份有限公司 | RH cold steel removing method |
| CN105861785B (en) * | 2015-01-23 | 2018-02-27 | 鞍钢股份有限公司 | Method for removing cold steel in middle groove and bottom groove of RH vacuum chamber |
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