CN106011384A - Method for smelting non-sedating molten steel - Google Patents
Method for smelting non-sedating molten steel Download PDFInfo
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- CN106011384A CN106011384A CN201610450518.4A CN201610450518A CN106011384A CN 106011384 A CN106011384 A CN 106011384A CN 201610450518 A CN201610450518 A CN 201610450518A CN 106011384 A CN106011384 A CN 106011384A
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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
-
- 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
-
- 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
- C21C7/0025—Adding carbon material
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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
-
- 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 invention provides a method for smelting non-sedating molten steel. The method is characterized by comprising the following steps that a converter outputs steel in a non-sedating mode; the non-sedating molten steel enters a ladle furnace (LF) so that the temperature can rise; the heated molten steel enters in an RH working procedure for carrying out a decarburizing reaction; oxygen probing is conducted, and a deoxidizing agent is added for terminating the decarburizing reaction; and deoxidation alloying is carried out. By the adoption of the method, the mode of combining LF physical heating with RH carbon deoxidization is adopted for solving the contradiction between low oxygen site control and temperatures, oxygen blowing or reserved high oxygen site heating operation caused by insufficient temperatures in the RH treatment process is removed, and therefore the low oxygen site before deoxidation can be stably controlled in the RH working procedure, deoxidation products are reduced fundamentally, and the purity degree of the molten steel is improved.
Description
Technical field
The present invention relates to metallurgy industry Refining Technology field, particularly to a kind of side smelting non-sedating molten steel
Method.
Background technology
RH (molten steel vacuum circulation degassing) system equipment is a kind of steel secondary refining for producing high-quality steel
Technological equipment, before steel treatment, first immerses dip pipe in pending ladle molten steel.When vacuum tank evacuation
Time, the atmospheric pressure of molten steel surface forces molten steel to flow in vacuum tank from dip pipe (in vacuum tank about
Molten steel can be made during 0.67mbar to rise 1.48m height).Two dip pipes connected with vacuum tank, one is
Tedge, one is down-comer.Owing to tedge is constantly blown into argon to molten steel, it is relatively free of the decline of Argon
Pipe creates a higher differential static pressure, makes molten steel enter into and through vacuum tank bottom from tedge and flows to decline
Pipe, the most constantly circulation is repeatedly.Under vacuum conditions, the argon in vacuum tank molten steel, hydrogen, an oxygen are flowed through
Change the gases such as carbon to be pumped in molten steel cyclic process.Meanwhile, the molten steel entered in vacuum tank also carries out a series of
Metallurgical reaction, such as vacuum decarburization, it carries out decarburization etc. in a vacuum chamber mainly by the oxygen in molten steel；So
Circulating degasification refine makes molten steel be purified.
The mode of smelting molten steel is converter tapping at present, and when refine is entered the station, molten steel is boiling steel, containing higher oxygen
Activity, first carries out decarburizing reaction in RH processing procedure, carries out molten steel by addition deoxidizer the most again
Calm process, so consumes more deoxidizer, produces substantial amounts of deoxidation products, and deoxidation products is most
It is present in molten steel with the form of field trash, Molten Steel Cleanliness and subsequent product quality are produced large effect；
For controlling the deoxidation products of lower content, reduce converter tapping oxygen activity, converter tapping oxygen activity from Sources controlling
Control to control in certain proportional relation with temperature, reduce converter tapping oxygen activity and certainly will cause the fall of tapping temperature
Low, thus cause carrying out heating by O2 blowing operation at refining procedure and produce a large amount of deoxidation products in turn；And improve and turn
Stove tapping temperature, refine enters the station acquisition higher oxygen activity and temperature, and refining procedure carries out carbon deoxidation operation and can obtain
Obtain oxygen activity before relatively low deoxidation, but it is too big to Converter condition and cost impact to improve liquid steel temperature simply, because of
Certain contradiction point is there is in this current smelting molten steel for controlling relatively low deoxidation products.
Carbon is as optimum deoxidant element, and deoxidation products will not pollute molten steel, how to utilize carbon
Deoxidation work may be completed greatly, challenge is how to balance the relation between molten steel oxygen activity and temperature, and current
This type of processing mode is difficult to both relation of balance in big production.
Summary of the invention
For the problems referred to above of the prior art, the invention provides a kind of method smelting non-sedating molten steel, logical
Cross and LF stove (ladle refining furnace) be combined smelting molten steel with RH technique, utilize LF stove physics heat up and
The mode that the carbon deoxidation mode of RH combines solves to control the contradiction point between hypoxia position and temperature, thus can be
The relatively low molten steel oxygen activity of acquisition stable during smelting molten steel and oxygen blast ratio, and then obtain the steel of high cleanliness
Water.
In order to achieve the above object, the present invention adopts the following technical scheme that a kind of method smelting non-sedating molten steel,
Converter non-sedating is tapped；
Non-sedating molten steel enters LF stove and heats up；
Non-sedating molten steel after intensification enters in RH operation and carries out decarburizing reaction；
Determine oxygen, add deoxidizer and terminate decarburizing reaction；
Deoxidation alloying.
As further preferably, when heating up in LF stove, it is warming up to temperature and meets the process of RH operation and want
Ask.
As the most preferably, heating up after terminating in described LF stove, described non-sedating molten steel is in LF stove
Carry out slag modification operation.
As the most preferably, described slag modification operating procedure is: use aluminum shot or aluminum slag carries out slag
Upgrading operation.
As the most preferably, when described non-sedating molten steel enters RH operation, carry out thermometric and determine oxygen operation.
As the most preferably, after described thermometric determines oxygen operation, if molten steel carbon hyperoxia is low, evacuation takes off
Carbon reacts；If molten steel oxygen high-carbon is low, pre-add carbon dust is to carry out decarburizing reaction after pre-deoxidation.
As the most preferably, during described entrance RH operation, also include oxygen blast step, sentence according to carbon-to-oxygen ratio
Disconnected whether oxygen blast operates, and decarburization oxygen consumption is 1:1.33, it is considered to vacuum chamber oxygen supplement, reserved oxygen activity
200-300ppm level.
As the most preferably, described pre-add carbon dust step is as follows: jacking ladle to dip pipe inserts molten steel face
In, carry out vacuumizing in described carbon dust is added vacuum tank.
As the most preferably, judge RH work according to the CO numerical value in decarburization time or gas analysis meter
In sequence, whether decarburizing reaction arrives smooth trend, if to decarburizing reaction smooth trend, carries out determining oxygen operation.
As the most preferably, according to the change of oxygen position, calculate the consumption carbon amounts of decarburizing reaction, then according to mesh
Scale value calls in carbon dust and ferroalloy.
As the most preferred, the molten steel that described deoxidation alloying processed, complete the pure circulation of steel grade requirement
After time and temperature control, broken sky, casting machine cast on bull ladle.
As the most preferably, liquid steel temperature during described converter tapping is 1620 DEG C-1650 DEG C, described
The liquid steel temperature entering RH operation is 1610-1630 DEG C, oxygen activity 300-600ppm.
As the most preferably, the liquid steel temperature of described entrance LF stove is 1550-1580 DEG C, described decarburization
Response time is 5-30min.
As the most preferably, at the end of decarburization, oxygen activity is 180-280ppm.
Beneficial effects of the present invention is as follows:
1, the present invention uses the non-sedating tapping of steel-making hypothermia and hypoxia position, hangs molten steel and carry out to LF stove after having tapped
Hyperthermic treatment, it is ensured that after the intensification of LF stove, temperature meets the process requirement of RH, and then molten steel winches to RH work
Sequence gently processes deoxidation operation, utilizes the carbon in molten steel to complete the early stage deoxidation work of molten steel, by molten steel
Oxygen activity controls to low spot (IF steel can be controlled between 250-300ppm), completes to take off according to process oxygen consumption
The calculating of carbon amounts, thus on the basis of not increasing the RH process time, complete the smelting work of this heat, so
The molten steel obtaining low deoxidation products stable on the basis of ensureing big production.
2, the present invention is in RH stove carries out light processing procedure, calculates the mode of decarburized amount according to process oxygen consumption
Smelt and gently process molten steel, be totally different from the current side determining carbon content scope by controlling oxygen activity scope
Formula.
3, the present invention solves to control by the mode combining the carbon deoxidation mode of the intensification of LF stove physics and RH
Contradiction point between hypoxia position and temperature, eliminate the oxygen blast caused due to temperature deficiency in RH processing procedure or
The operation heated up in reserved hyperoxia position, such that it is able to the hypoxia position before the control deoxidation that RH operation is relatively stable,
Fundamentally reduce the generation of deoxidation products, improve Molten Steel Cleanliness.
Accompanying drawing explanation
Fig. 1 is the schematic flow sheet that the embodiment of the present application smelts the method for non-sedating molten steel.
Detailed description of the invention
The application is by a kind of method smelting non-sedating molten steel of offer, employing LF stove physics intensification and RH
The mode that carbon deoxidation mode combines solves to control the contradiction point between hypoxia position and temperature, eliminates due to RH
Oxygen blast that in processing procedure, temperature deficiency causes or the operation heated up in reserved hyperoxia position, such that it is able in RH operation
The relatively stable hypoxia position before control deoxidation, fundamentally reduces the generation of deoxidation products, improves molten steel pure
Degree.
In order to be better understood from technical scheme, below in conjunction with Figure of description and concrete embodiment party
Technique scheme is described in detail by formula.
As it is shown in figure 1, the method that the embodiment of the present application smelts non-sedating molten steel, comprise the steps:
A, converter non-sedating are tapped；
B, non-sedating molten steel enter LF stove and heat up；
C, the rear molten steel that heated up enter in RH operation and carry out decarburizing reaction, to consume the oxygen activity in molten steel,
Thus oxygen activity is in lower value before controlling deoxidation；
D, determine oxygen, add deoxidizer and terminate decarburizing reaction；
E, deoxidation alloying.
In step A, the molten steel of converter non-sedating tapping, take hypothermia and hypoxia position to tap, it is not necessary to consider follow-up
Temperature is not enough, it is not necessary to because temperature low generation after-blow operates.In the described i.e. converter tapping process of non-sedating molten steel not
Carry out deoxidation treatment or the incomplete molten steel of deoxidation, it is ensured that in converter tapping terminates rear ladle, molten steel contains necessarily
Oxygen activity.
In step B, rise temperature control termination condition and be to ensure that temperature meets the process requirement of RH operation, make RH
It is not required to heat up.
In step B, non-sedating molten steel can carry out suitable slag modification operation in LF stove, it is ensured that slag oxygen
Changing sexual satisfaction RH steel grade demand, the operation of described slag modification is carried out after a liter temperature control terminates.Described slag changes
Matter operating procedure is: use aluminum shot or aluminum slag carries out slag upgrading operation, controls argon and do not turn over greatly during modification,
Ensure that the top of the slag springs up slightly, it is to avoid molten steel is stirred vigorously with the top of the slag.
In step C, when RH molten steel enters the station, first carry out thermometric, determine oxygen operation, according to enter the station oxygen activity with
Furnace rear carbometer is the most no can be controlled molten steel oxygen activity in target zone.
If entering the station, carbon hyperoxia is low, and direct evacuation carries out decarburizing reaction；
If entering the station, oxygen high-carbon is low, it is impossible to control within desired value by the oxygen activity in molten steel, and pre-add carbon dust is with in advance
Decarburizing reaction is carried out after deoxidation.
Pre-add carbon dust step is as follows: jacking ladle to dip pipe inserts in molten steel face, is then added by the carbon dust of calculating
Vacuumizing is carried out in entering vacuum tank；Vacuum carries out before starting adding carbon dust operation；The calculating adding carbon dust amount is lived with oxygen
Degree exceeds value and is correlated with, can design calculation formula, calculate the carbon dust amount that adds according to desired value, then setting minimum adds
Enter scope to judge whether to add.
In step C, also including oxygen blast step, judge whether that oxygen blast operates according to carbon-to-oxygen ratio, decarburization oxygen consumption is
1:1.33, it is considered to vacuum chamber oxygen supplement, reserved oxygen position 200-300ppm level.
Judge in step C, whether decarburizing reaction arrives flat according to the CO numerical value in decarburization time or gas analysis meter
Slow trend, i.e. guarantees that the oxygen activity variation tendency in molten steel tends to tranquil, if to decarburizing reaction smooth trend, entering
Row determines oxygen operation.
In step E, according to the change of oxygen position, calculate the consumption carbon amounts that decarburization (carbon oxygen) is reacted, then according to mesh
Scale value calls in carbon dust and ferroalloy, such as ferrosilicon or ferromanganese.
The molten steel that step E processed, after completing pure circulation time and the temperature control of steel grade requirement, broken sky, hangs
Wrap casting machine cast.
In the embodiment of the present application, unkilled steel coolant-temperature gage during described converter tapping is 1620 DEG C-1650 DEG C,
The unkilled steel coolant-temperature gage of described entrance LF stove is 1550-1580 DEG C, the non-sedating of described entrance RH operation
Liquid steel temperature is 1610-1630 DEG C, and oxygen activity is 300-600ppm；The described decarburizing reaction time is
5-30min, at the end of decarburization, oxygen activity is 180-280ppm.
Embodiment 1:
The method of a kind of Novel smelting molten steel that the embodiment of the present application 1 provides, the method is by different refine works
The integration of skill, stably and effectively controls the low oxygen activity before deoxidation, and control room considers essence when rhythm arranges
LF stove+RH the process route of refining, prepares arrangement to overall rhythm matching and subsequent production and carries out production standard
Standby work；Specifically include following step:
Step S1: control room, when setting refining cycle, sets according to follow-up LF stove+RH process route
Reasonably in station cycle and subsequent production preparation；
Step S2: converter hypothermia and hypoxia position non-sedating is tapped, for different steel grade requirements, converter tapping temperature
Spending 1620 DEG C-1650 DEG C, control carbon content of molten steel more than 3%, molten steel enters not deoxidation in ladle, is not added with
Alloy；Molten steel hangs and carries out warming temperature toward LF stove；
After step S3:LF furnaceman's sequence molten steel arrives at a station, carry out thermometric operation, it is contemplated that temperature of arriving at a station is about
1550-1580 DEG C, carry out warming temperature according to the temperature requirements of RH operation, it is contemplated that intensification 15-25min it
Between, temperature-rise period can add part slag charge to guarantee that slag meets intensification requirement, LF stove heats up according to self
Curve controlled electric power system carries out warming temperature, and temperature controls do not carry out warming temperature with RH and adjust steel scrap behaviour
As preferably, after LF stove heats up, require that can add slag modification agent carries out slag modification operation, takes according to steel grade
LF stove terminates sample；Intensification arranges molten steel to hang toward RH process according to rhythm after completing；
Step S4:RH enter the station carry out thermometric, determine oxygen operation, inlet temperature is about between 1610-1630 DEG C,
Oxygen position between 300-600ppm, according to carbon-to-oxygen ratio judge whether oxygen blast operation (decarburization oxygen consumption is 1:1.33,
Consider vacuum chamber oxygen supplement, reserved oxygen position 200-300ppm level)；
Step S5: carry out RH carbonization treatment: RH and take presetting carbon dust or direct vacuum according to the condition of entering the station
The mode processed carries out decarburization oxygen consumption reaction, according to the CO numerical value in reaction between carbon and oxygen time or gas analysis meter
Judge whether decarburizing reaction arrives smooth trend；Wherein,
If entering the station, oxygen high-carbon is low, carries out the operation of pre-add carbon dust deoxidation, and jacking ladle to dip pipe inserts molten steel face
In, carry out vacuum in then the carbon dust of calculating being added vacuum tank and start operation；
Judge that decarburizing reaction becomes the most gently according to the CO numerical value in decarburizing reaction time or gas analysis meter
Gesture, needs to carry out groping data according to equipment of itself, thus stablizes and hold decarburizing reaction regional stability accurately,
In molten steel no longer there is significant change in oxygen activity；
Combine with Theoretical Calculation according to real data, show that corresponding relation in reaction between carbon and oxygen is in this region
Application.
LCAK steel grade light processing controls decarburization time is that 6-8min, IF steel grade carbonization treatment is according to terminating C content
Decarburization time is implemented in requirement: when productive target carbon content is less than the steel grade of 15ppm, decarburization time controls
In 20min-25min；Productive target carbon content when the steel grade of 15ppm-60ppm, decarburization time control
System is in 15min-20min.
Step S6: after completing decarburization task, controls oxygen activity in target zone, then according to determining oxygen value
Carry out deoxidation alloying operation, according to the change of oxygen position, calculate the consumption carbon amounts of reaction between carbon and oxygen, then according to target
Value calls in carbon dust and other alloy, and this heat deoxidation alloying completes；
Step S7: after completing pure circulation time and the temperature control of steel grade requirement, broken sky, on bull ladle, casting machine waters
Note.
Parameter embodiment 1.1:
LCAK steel grade, Tapping Temperature of Bof 1630 DEG C, tapping process does not adds alloy and modification agent, furnace rear temperature
Spend 1580 DEG C.LF stove inlet temperature 1563 DEG C, oxygen activity 553ppm, LF stove processing procedure adds 1.3t
Ternary synthetic slag for pipe carries out submerged arc, intensification 18min, end temp 1630 DEG C, adds modification agent 600Kg and carries out slag
Upgrading operation.Bull ladle RH carbonization treatment, inlet temperature 1615 DEG C, oxygen activity 610ppm, enter the station C:
0.041%, add carbon dust 30Kg pre-deoxidation, natural decarburization 7min, decarburization terminates oxygen activity 217ppm.
Parameter embodiment 1.2:
IF steel, upper limit carbon require 30ppm, Tapping Temperature of Bof 1641 DEG C, tapping process do not add alloy and
Modification agent, furnace rear temperature 1593 DEG C.LF stove inlet temperature 1573 DEG C, at oxygen activity 542ppm, LF stove
Reason process adds 1.0t ternary synthetic slag for pipe and carries out submerged arc, intensification 19min, end temp 1632 DEG C, adds modification
Agent 500Kg carries out slag upgrading operation.Bull ladle RH carbonization treatment, inlet temperature 1618 DEG C, oxygen activity 589ppm,
Enter the station C:0.037%, and natural decarburization 15min, decarburization terminates oxygen activity 262ppm.
Parameter embodiment 1.3:
IF steel, upper limit carbon require 10ppm, Tapping Temperature of Bof 1645 DEG C, tapping process do not add alloy and
Modification agent, furnace rear temperature 1591 DEG C.LF stove inlet temperature 1569 DEG C, at oxygen activity 521ppm, LF stove
Reason process adds 1.0t ternary synthetic slag for pipe and carries out submerged arc, intensification 20min, end temp 1636 DEG C, adds modification
Agent 500Kg carries out slag upgrading operation.Bull ladle RH carbonization treatment, inlet temperature 1620 DEG C, oxygen activity 577ppm,
Enter the station C:0.039%, and natural decarburization 20min, decarburization terminates oxygen activity 259ppm.
Parameter embodiment 1.4:
LCAK steel grade, Tapping Temperature of Bof 1625 DEG C, tapping process does not adds alloy and modification agent, furnace rear temperature
Spend 1581 DEG C.LF stove inlet temperature 1565 DEG C, oxygen activity 483ppm, LF stove processing procedure adds 1.0t
Ternary synthetic slag for pipe carries out submerged arc, intensification 17min, end temp 1631 DEG C, adds modification agent 450Kg and carries out slag
Upgrading operation.Bull ladle RH carbonization treatment, inlet temperature 1617 DEG C, oxygen activity 532ppm, enter the station C:
0.049%, natural decarburization 7min, decarburization terminates oxygen activity 115ppm.
Technical scheme in above-mentioned the embodiment of the present application, at least has the following technical effect that or advantage:
1, the present invention is by the molten steel of non-sedating processing mode, the tapping of steel-making hypothermia and hypoxia position, hangs after having tapped
Molten steel carries out hyperthermic treatment to LF stove, it is ensured that after the intensification of LF stove, temperature meets the process requirement of RH, then will
Molten steel winches to RH operation and gently processes deoxidation operation, utilizes the carbon in molten steel to complete the early stage deoxidation work of molten steel
Make, the oxygen activity in molten steel is controlled to low spot (IF steel can be controlled between 250-300ppm), according to mistake
Journey oxygen consumption completes the calculating of decarburized amount, thus completes this heat on the basis of not increasing the RH process time
Smelt work, so stable on the basis of the ensureing big production molten steel obtaining low deoxidation products.
2, the present invention is in RH stove carries out light processing procedure, calculates the mode of decarburized amount according to process oxygen consumption
Smelt and gently process molten steel, be totally different from the current side determining carbon content scope by controlling oxygen activity scope
Formula.
3, the present invention solves to control by the mode combining the carbon deoxidation mode of the intensification of LF stove physics and RH
Contradiction point between hypoxia position and temperature, eliminate the oxygen blast caused due to temperature deficiency in RH processing procedure or
The operation heated up in reserved hyperoxia position, such that it is able to the hypoxia position before the control deoxidation that RH operation is relatively stable,
Fundamentally reduce the generation of deoxidation products, improve Molten Steel Cleanliness.
Although preferred embodiments of the present invention have been described, but those skilled in the art once know substantially
Creative concept, then can make other change and amendment to these embodiments.So, claims are anticipated
It is intended to be construed to include preferred embodiment and fall into all changes and the amendment of the scope of the invention.Obviously, this area
Technical staff the present invention can be carried out various change and modification without departing from the spirit and scope of the present invention.This
Sample, if the present invention these amendment and modification belong to the claims in the present invention and equivalent technologies thereof scope it
In, then the present invention is also intended to comprise these change and modification.
Claims (10)
1. the method smelting non-sedating molten steel, it is characterised in that: described method includes the following:
Converter non-sedating is tapped；
Non-sedating molten steel enters LF stove and heats up；
Non-sedating molten steel after intensification enters in RH operation and carries out decarburizing reaction；
Determine oxygen, add deoxidizer and terminate decarburizing reaction；
Deoxidation alloying.
The method of smelting molten steel the most according to claim 1, it is characterised in that: heat up in LF stove
Time, it is warming up to temperature and meets the process requirement of RH operation.
The method of smelting molten steel the most according to claim 1, it is characterised in that: in described LF stove
After intensification terminates, described non-sedating molten steel carries out slag modification operation in LF stove.
The method of smelting molten steel the most according to claim 3, it is characterised in that: described slag modification is grasped
As step it is: use aluminum shot or aluminum slag carries out slag modification operation.
The method of smelting molten steel the most according to claim 1, it is characterised in that: described non-sedating molten steel
When entering RH operation, carry out thermometric and determine oxygen operation.
The method of smelting molten steel the most according to claim 5, it is characterised in that: described thermometric determines oxygen behaviour
After work, if molten steel carbon hyperoxia is low, evacuation carries out decarburizing reaction；If molten steel oxygen high-carbon is low, pre-add carbon dust is with in advance
Decarburizing reaction is carried out after deoxidation.
The method of smelting molten steel the most according to claim 6, it is characterised in that: described pre-add carbon dust walks
Rapid as follows: jacking ladle to dip pipe inserts in molten steel face, carries out vacuum behaviour in described carbon dust is added vacuum tank
Make.
The method of smelting molten steel the most according to claim 1, it is characterised in that: according to decarburization time or
It is that the CO numerical value in gas analysis meter judges in RH operation, whether decarburizing reaction arrives smooth trend, anti-to decarburization
Smooth trend is answered then to carry out determining oxygen operation.
The method of smelting molten steel the most according to claim 1, it is characterised in that: described deoxidation alloying
For: according to the change of oxygen position, calculate the consumption carbon amounts of decarburizing reaction, call in carbon dust and ferroalloy.
The method of smelting molten steel the most according to claim 1, it is characterised in that: the non-town of described converter
Liquid steel temperature during quiet tapping is 1620 DEG C-1650 DEG C, and the liquid steel temperature of described entrance RH operation is
1610-1630 DEG C, oxygen activity 300-600ppm.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106893800A (en) * | 2017-04-06 | 2017-06-27 | 首钢总公司 | A kind of method of deoxidation |
| CN108660287A (en) * | 2018-07-02 | 2018-10-16 | 邯郸钢铁集团有限责任公司 | A kind of LF stoves steel scrap adding set and adding method |
| CN112680557A (en) * | 2020-12-25 | 2021-04-20 | 唐山燕山钢铁有限公司 | Dephosphorization method for smelting ultra-low phosphorus steel |
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| CN106893800A (en) * | 2017-04-06 | 2017-06-27 | 首钢总公司 | A kind of method of deoxidation |
| CN108660287A (en) * | 2018-07-02 | 2018-10-16 | 邯郸钢铁集团有限责任公司 | A kind of LF stoves steel scrap adding set and adding method |
| CN112680557A (en) * | 2020-12-25 | 2021-04-20 | 唐山燕山钢铁有限公司 | Dephosphorization method for smelting ultra-low phosphorus steel |
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