CN105950815A - Recycled steel converter blowing method - Google Patents
Recycled steel converter blowing method Download PDFInfo
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- CN105950815A CN105950815A CN201610456992.8A CN201610456992A CN105950815A CN 105950815 A CN105950815 A CN 105950815A CN 201610456992 A CN201610456992 A CN 201610456992A CN 105950815 A CN105950815 A CN 105950815A
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- steel
- molten iron
- molten
- slag
- carbon content
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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
- C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
- C21C5/28—Manufacture of steel in the converter
- C21C5/30—Regulating or controlling the blowing
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Carbon Steel Or Casting Steel Manufacturing (AREA)
Abstract
The invention discloses a recycled steel converter blowing method. According to the type of recycled steel and the weight of molten recycled steel, the reasonable matching amount of molten iron and steel scraps is determined; according to the content of carbon and silicon of the molten metal obtained after the molten iron and the recycled steel are mixed, the proper adding amount and adding manner of lime and light-burned dolomite are determined; according to the content of manganese of the recycled steel and the weight of the molten recycled steel, the reasonable adding amount of raw dolomite is determined; lowering of the earlier-stage blowing gun positions and other measures are taken, the decarburization and temperature rise relation in the recycled steel blowing process is processed well, the coordination of carbon temperature in the recycled steel converter blowing process is ensured, the uniform reaction of decarburization is promoted, and splashing is avoided; and consumption of steel materials and the phenomenon of overflowing of yellow fume are reduced, and good economic benefits and environment benefits are obtained.
Description
Technical field
The present invention relates to converter steeling technology field, especially relate to one and melt down steel converter converting method.
Background technology
Owing to composition or the temperature of molten steel are defective, or casting equipment breaks down, it is impossible to it is necessary to incite somebody to action when continuing to water steel
Molten steel returns to bessemerize, and melts down steel here it is so-called.
With melting down steel steel-making, because of the situation such as the Initial Composition of initial temperature, the initial carbon content of molten metal and slag in stove
Being very different with the non-steel process for making that melts down, the blowing pattern therefore melting down steel has the biggest district with normal blowing pattern
Not, if melting down steel by the blowing of normal blowing pattern splash accident will occur in smelting process, iron and steel is not only increased
Material consumes and causes tobacco excessive, but also there is bigger safety and hidden trouble of equipment, is even forced to stop to smelt.
Therefore, how to improve the existing converting method melting down steel, be reduced or avoided and melt down steel and produce during bessemerizing
Raw splash accident, is that current those skilled in the art need badly and solve the technical problem that.
Summary of the invention
In view of this, it is an object of the invention to provide one and melt down steel converter converting method, the method can be reduced or avoided
Melt down the splash accident that steel produces during bessemerizing, reduce steel technology produced by splash accident and escape Huang
Cigarette, reduces potential safety hazard.
For solving above-mentioned technical problem, the technical scheme that the present invention provides is:
One melts down steel converter converting method, comprises the following steps:
1) slag in evacuation converter, and pour out the part refining slag melted down entrained by steel；
2) in converter add steel scrap, melt down steel and molten iron, during bessemerizing, add slag material Calx with
Light dolomite, through pneumatic steelmaking, obtains target molten steel.
Preferably, steel scrap, melt down the addition sequence of steel and molten iron for first steel scrap, then melt down steel, last molten iron.
Preferably, according to melting down the weight of molten steel, the charge weight of suitable molten iron and steel scrap, i.e. molten iron and steel scrap are determined
Proportioning need to meet molten iron: steel scrap >=10:1, and melts down steel charge weight+molten iron charge weight+steel scrap charge weight=normal heat
Charge weight.
Preferably, according to melting down the weight of steel, composition and the weight of institute's hot metal charging, composition, calculate and melt down steel and ferrum
After water mixing, the carbon content in stove inner metal liquid and silicone content, calculate the addition of slag material Calx the most again, calculates public affairs
Formula is:
R=2.0～3.2 in formula, represents the dual alkalinity of slag, and its value size depends on that the carbon of mixed molten metal contains
Amount height: carbon content 1% and following time, R is 2.0；When carbon content is more than 1%, on the basis of 2.0, carbon contains
Amount often increases by 0.3%, and R increases by 0.1.
Preferably, light dolomite adds total amount is 35%～45% of lime adding amount under equal conditions.
Preferably, the feed way of slag material is determined according to the carbon content of mixed molten metal:
1) when carbon content≤1.0% melted down in steel and the mixed molten metal of molten iron, Calx and light dolomite are being opened
Disposably add after blowing；
2) as the carbon content ＞ 1.0% melted down in steel and the mixed molten metal of molten iron, Calx and light dolomite are in batches
Adding, the addition of first Calx and light dolomite is the 2/3～4/5 of respective total addition；
Capping when carbon content is low in molten metal, removes the limit during carbon content height；
Second batch Calx and light dolomite compared with normal are smelted pattern and are shifted to an earlier date 1min～1.5min addition.
Preferably, slag material also includes unprocessed dolomite, to dilute manganese oxide in slag, is thickened slag, the addition of unprocessed dolomite
Measuring=melt down steel weight × melt down Fe content × 2 in steel, described unprocessed dolomite adds in stove with first slag material.
Preferably, early stage blowing rifle position is 1650mm～1750mm, carries rifle extremely when blowing is to 1.5min～2min
1750mm～1850mm.
The present invention takes, according to melting down steel steel grade and melting down Metal Weight, to determine that rational molten iron, steel scrap are with addition of amount；According to
Molten iron and melt down the carbon content of molten metal and silicone content after steel reinforced concrete closes, determine suitable Calx, light dolomite addition and
Feed postition；According to melting down in steel Fe content and melting down Metal Weight, determine rational unprocessed dolomite addition；Before reduction
The measures such as phase blowing rifle position, handle the relation of decarburization and the intensification melting down steel converting process well, it is ensured that bessemerizing
When melting down steel, carbon temperature is coordinated, and promotes decarburizing reaction and uniformly carries out, it is to avoid the generation of splash, reduces steel technology
With decrease the excessive phenomenon of tobacco, achieve preferable economic benefit and environmental benefit.
Detailed description of the invention
In order to be further appreciated by the present invention, below in conjunction with embodiment, the preferred embodiment of the invention is described, but should
Working as understanding, these descriptions simply further illustrate inventive feature and advantage rather than the limit to the claims in the present invention
System.
The invention provides one and melt down steel converter converting method, comprise the following steps:
1) slag in evacuation converter, and pour out the part refining slag melted down entrained by steel；
2) in converter add steel scrap, melt down steel and molten iron, during bessemerizing, add slag material Calx with
Light dolomite, through pneumatic steelmaking, obtains target molten steel.
In one embodiment of the invention, steel scrap, melt down the addition sequence of steel and molten iron for first steel scrap, then melt down steel,
Last molten iron.
In one embodiment of the invention, according to melting down the weight of molten steel, determine the charge weight of suitable molten iron and steel scrap,
The i.e. proportioning of molten iron and steel scrap need to meet molten iron: steel scrap >=10:1, and melt down steel charge weight+molten iron charge weight+steel scrap and load
The charge weight of amount=normal heat.
In one embodiment of the invention, according to melting down the weight of steel, composition and the weight of institute's hot metal charging, composition,
Calculate the carbon content and silicone content melted down after steel mixes with molten iron in stove inner metal liquid, calculate slag material Calx the most again
Addition, computing formula is:
R=2.0～3.2 in formula, represents the dual alkalinity of slag, and its value size depends on that the carbon of mixed molten metal contains
Amount height: carbon content 1% and following time, R is 2.0；When carbon content is more than 1%, on the basis of 2.0, carbon contains
Amount often increases by 0.3%, and R increases by 0.1.
In one embodiment of the invention, light dolomite add total amount be lime adding amount under equal conditions 35%～
45%.Preferably, light dolomite adds total amount is under equal conditions the 40% of lime adding amount.
In one embodiment of the invention, the feed way of slag material is determined according to the carbon content of mixed molten metal:
1) when carbon content≤1.0% melted down in steel and the mixed molten metal of molten iron, Calx and light dolomite are being opened
Disposably add after blowing；Because during stove inner metal liquid initial carbon content≤1.0%, along with slowly carrying out of early stage decarburizing reaction
The carbon content of stove inner metal liquid is gradually lowered, when reaching the temperature of carbon oxygen generation intense reaction, and the carbon content in molten metal
Having been lowered to less than 0.6%, reaction between carbon and oxygen speed will be gradually lowered, and be not result in that splash occurs, it is not necessary to Calx or light-burned
Dolomite compacting splash；Furthermore because carbon content is low, duration of blast is shorter, if adding slag charge in batches, two batch of materials may come
Complete not as good as being completely melt already to blow, cause the waste of slag material；
2) as the carbon content ＞ 1.0% melted down in steel and the mixed molten metal of molten iron, Calx and light dolomite are in batches
Adding, the addition of first Calx and light dolomite is the 2/3～4/5 of respective total addition；
Capping when carbon content is low in molten metal, removes the limit during carbon content height；
Because in stove, initial temperature compared with normal smelts pattern height, so reaction between carbon and oxygen is in advance, for preventing splash, second batch Calx
Smelt pattern with light dolomite compared with normal and shift to an earlier date 1min～1.5min addition.
In one embodiment of the invention, the steel that melts down of different steel grades contains the manganese that quantity differs, and generates oxygen after manganese oxidation
Changing manganese and enter slag, reduce the fusing point of slag, for manganese oxide in dilution slag, be thickened slag, slag material also includes raw white
Marble, the addition of unprocessed dolomite=melt down steel weight × melt down Fe content × 2 in steel, described unprocessed dolomite is made with first
Slag charge adds in stove.
Open piping and druming fire and early stage blowing use low rifle position, until reaction between carbon and oxygen from the beginning of time again properly increase blowing rifle position.Early stage
Blowing rifle position is 1650mm～1750mm, carries rifle when blowing is to 1.5min～2min to 1750mm～1850mm.
Raw material that the present invention does not elaborates, method and device etc. are prior art.
In order to be further appreciated by the present invention, below in conjunction with embodiment, the one that the present invention provides is melted down steel converter converting method
Being described in detail, protection scope of the present invention is not limited by the following examples.
By nominal capacity 120 tons, standard charge weight 150 tons, tap 140 tons converter as a example by carry out the method should
With explanation.
Such converter common process early stage blowing rifle position be 2000mm, second batch slag material open blow 3min～4min time
Add.
Embodiment 1
1. melting down steel weight is 125.6 tons, and steel grade is Q235BH, and composition is as follows: [C]: 0.159%, [Si]: 0.186%,
[Mn]: 0.563% and other micro constitutents.
2. with addition of 22.4 tons of molten iron and 2 tons of steel scraps.Hot metal composition is as follows: [C]: 4.81%, [Si]: 0.54%, [Mn]:
0.25%, [P]: 0.105%, [S]: 0.026%.
3. the mean carbon content calculating inner metal liquid of coming out of the stove is 0.863%, and silicone content is 0.24%.Carbon content ＜ 1%, takes
Basicity R=2.0, the addition calculating Calx according to formula is 1785kg, further, the addition of light dolomite
For 714kg.
4. the slag in evacuation converter pour out the part refining slag melted down entrained by steel.
5. add steel scrap in first backward converter, melt down steel and molten iron.
6. carbon content ＜ 1% of hybrid metal liquid in this stove stove, opens the whole Calx of disposable addition and light dolomite after blowing.
7. according to formula calculate unprocessed dolomite addition be 1414kg, open blow after with Calx and light dolomite
Add in stove.
8. early stage blowing rifle position is 1800mm, is gradually lowered rifle position to finishing blowing.
In converting process, blowing is stable, splash accident does not occurs.
Embodiment 2
1. melting down steel weight is 80.2 tons, and steel grade is Q390B, and composition is as follows: [C]: 0.167%, [Si]: 0.312%,
[Mn]: 1.473% and other micro constitutents.
2., with addition of 64 tons of molten iron and 5.8 tons of steel scraps, hot metal composition is as follows: [C]: 4.56%, [Si]: 0.48%, [Mn]:
0.28%, [P]: 0.116%, [S]: 0.031%.
3. the mean carbon content calculating inner metal liquid of coming out of the stove is 2.12%, and silicone content is 0.387%.According to its carbon content,
Taking basicity R=2.35, the addition calculating Calx according to formula is 3298kg, further, and adding of light dolomite
Entering amount is 1319kg.
4. the slag in evacuation converter pour out the part refining slag melted down entrained by steel.
5. add steel scrap in first backward converter, melt down steel and molten iron.
6. according to the carbon content of hybrid metal liquid in this stove stove, use the mode that adds in batches of slag material, open after blowing the
A collection of Calx and light dolomite account for the 3/4 of the most total addition respectively, i.e. add Calx 2473kg, light dolomite
989kg。
7. the addition according to formula calculating unprocessed dolomite is 2362kg, adds in stove with first slag material.
8. early stage blowing rifle position is 1700mm, carries rifle when blowing is to 1.8min to 1800mm.
9. open blow 2min time, add residue Calx 825kg, light dolomite 330kg.
In converting process, blowing is stable, splash accident does not occurs.
Embodiment 3
1. melting down steel weight is 18.9 tons, and steel grade is Q345B, and composition is as follows: [C]: 0.172%, [Si]: 0.346%,
[Mn]: 1.358% and other micro constitutents.
2., with addition of 120 tons of molten iron and 11.1 tons of steel scraps, hot metal composition is as follows: [C]: 4.93%, [Si]: 0.61%,
[Mn]: 0.31%, [P]: 0.109%, [S]: 0.023%.
3. the mean carbon content calculating inner metal liquid of coming out of the stove is 4.28%, and silicone content is 0.574%.According to its carbon content,
Taking basicity R=3.1, the addition calculating Calx according to formula is 6223kg, further, and the addition of light dolomite
Amount is 2489kg.
4. the slag in evacuation converter pour out the part refining slag melted down entrained by steel.
5. add steel scrap in first backward converter, melt down steel and molten iron.
6. according to the carbon content of hybrid metal liquid in this stove stove, use the mode that adds in batches of slag material, open after blowing the
A collection of Calx and light dolomite account for the 2/3 of the most total addition respectively, i.e. add Calx 4149kg, light dolomite
1659kg。
7. calculating unprocessed dolomite addition according to formula is 513kg, adds in stove with first slag material.
8. early stage blowing rifle position is 1650mm, carries rifle when blowing is to 2min to 1770mm.
9. open blow 2.5min time, add residue Calx 2074kg, light dolomite 830kg.
In converting process, blowing is stable, splash accident does not occurs.
The explanation of above example is only intended to help to understand method and the core concept thereof of the present invention.It should be pointed out that, for
For those skilled in the art, under the premise without departing from the principles of the invention, it is also possible to the present invention is carried out
Some improvement and modification, these improve and modify in the protection domain also falling into the claims in the present invention.
Described above to the disclosed embodiments, makes professional and technical personnel in the field be capable of or uses the present invention.Right
Multiple amendment in these embodiments is apparent from for those skilled in the art, defined herein one
As principle can realize in other embodiments without departing from the spirit or scope of the present invention.Therefore, this
The bright the embodiments shown herein that is not intended to be limited to, and be to fit to and principles disclosed herein and features of novelty
Consistent widest range.
Claims (8)
1. one kind melts down steel converter converting method, it is characterised in that comprise the following steps:
1) slag in evacuation converter, and pour out the part refining slag melted down entrained by steel；
2) in converter add steel scrap, melt down steel and molten iron, during bessemerizing, add slag material Calx with
Light dolomite, through pneumatic steelmaking, obtains target molten steel.
The most according to claim 1 melt down steel converter converting method, it is characterised in that steel scrap, melt down steel and
The addition sequence of molten iron is first steel scrap, then melts down steel, last molten iron.
The most according to claim 1 melt down steel converter converting method, it is characterised in that according to the weight melting down molten steel
Amount, determines that the proportioning of the charge weight of suitable molten iron and steel scrap, i.e. molten iron and steel scrap need to meet molten iron: steel scrap >=10:1,
And melt down the charge weight of steel charge weight+molten iron charge weight+steel scrap charge weight=normal heat.
The most according to claim 1 melt down steel converter converting method, it is characterised in that
According to melting down the weight of steel, composition and the weight of institute's hot metal charging, composition, calculate and melt down after steel mixes with molten iron
Carbon content in stove inner metal liquid and silicone content, calculate the addition of slag material Calx the most again, and computing formula is:
R=2.0～3.2 in formula, represents the dual alkalinity of slag, and its value size depends on that the carbon of mixed molten metal contains
Amount height: carbon content 1% and following time, R is 2.0；When carbon content is more than 1%, on the basis of 2.0, carbon contains
Amount often increases by 0.3%, and R increases by 0.1.
The most according to claim 1 melt down steel converter converting method, it is characterised in that light dolomite adds total
Amount is under equal conditions the 35%～45% of lime adding amount.
The most according to claim 1 melt down steel converter converting method, it is characterised in that according to mixed metal
The carbon content of liquid determines the feed way of slag material:
1) when carbon content≤1.0% melted down in steel and the mixed molten metal of molten iron, Calx and light dolomite are being opened
Disposably add after blowing；
2) as the carbon content ＞ 1.0% melted down in steel and the mixed molten metal of molten iron, Calx and light dolomite are in batches
Adding, the addition of first Calx and light dolomite is the 2/3～4/5 of respective total addition；
Capping when carbon content is low in molten metal, removes the limit during carbon content height；
Second batch Calx and light dolomite compared with normal are smelted pattern and are shifted to an earlier date 1min～1.5min addition.
The most according to claim 1 melt down steel converter converting method, it is characterised in that slag material also includes raw white
Marble, to dilute manganese oxide in slag, is thickened slag, and the addition of unprocessed dolomite=melt down steel weight × melt down manganese in steel contains
Amount × 2, described unprocessed dolomite adds in stove with first slag material.
The most according to claim 1 melt down steel converter converting method, it is characterised in that early stage blowing rifle position is
1650mm～1750mm, carries rifle to 1750mm～1850mm when blowing is to 1.5min～2min.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610456992.8A CN105950815A (en) | 2016-06-22 | 2016-06-22 | Recycled steel converter blowing method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610456992.8A CN105950815A (en) | 2016-06-22 | 2016-06-22 | Recycled steel converter blowing method |
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| CN105950815A true CN105950815A (en) | 2016-09-21 |
Family
ID=56904270
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| Application Number | Title | Priority Date | Filing Date |
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| CN201610456992.8A Pending CN105950815A (en) | 2016-06-22 | 2016-06-22 | Recycled steel converter blowing method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106834592A (en) * | 2017-01-03 | 2017-06-13 | 山东钢铁股份有限公司 | A kind of method that steel treatment is melted down in converter |
| CN113789425A (en) * | 2021-09-14 | 2021-12-14 | 鞍钢股份有限公司 | Method for smelting and returning high-silicon molten steel by converter |
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| CN102080136A (en) * | 2011-01-19 | 2011-06-01 | 储鸿文 | Converter smelting technique |
| CN104911295A (en) * | 2015-06-08 | 2015-09-16 | 北京科技大学 | Converter low-slag-added smelting method |
| CN105648305A (en) * | 2016-04-18 | 2016-06-08 | 宝鸡市晨瑞鑫铸造有限责任公司 | High-strength gray cast iron material and preparation method thereof |
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2016
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| CN102080136A (en) * | 2011-01-19 | 2011-06-01 | 储鸿文 | Converter smelting technique |
| CN104911295A (en) * | 2015-06-08 | 2015-09-16 | 北京科技大学 | Converter low-slag-added smelting method |
| CN105648305A (en) * | 2016-04-18 | 2016-06-08 | 宝鸡市晨瑞鑫铸造有限责任公司 | High-strength gray cast iron material and preparation method thereof |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106834592A (en) * | 2017-01-03 | 2017-06-13 | 山东钢铁股份有限公司 | A kind of method that steel treatment is melted down in converter |
| CN106834592B (en) * | 2017-01-03 | 2019-02-12 | 山东钢铁股份有限公司 | A kind of method that steel treatment is melted down in converter |
| CN113789425A (en) * | 2021-09-14 | 2021-12-14 | 鞍钢股份有限公司 | Method for smelting and returning high-silicon molten steel by converter |
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Application publication date: 20160921 |