CN104109736B - A kind of method of 304 stainless steel of AOD converter smeltings - Google Patents
A kind of method of 304 stainless steel of AOD converter smeltings Download PDFInfo
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- CN104109736B CN104109736B CN201410280850.1A CN201410280850A CN104109736B CN 104109736 B CN104109736 B CN 104109736B CN 201410280850 A CN201410280850 A CN 201410280850A CN 104109736 B CN104109736 B CN 104109736B
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- manganese
- bannisterite
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Abstract
A kind of method of 304 stainless steel of AOD converter smeltings, including：1) sial oxidation stage；2) main decarburizing phase；3) dynamic decarburizing phase；4) reduction phase；5) desulfurized alloy；Match somebody with somebody bannisterite ball it is characterized in that being added in reduction phase, 7 should be pressed with ferrosilicon powder using the manganese mineral powder of percentage composition containing manganese 25~40% with bannisterite ball：3, which carry out mixing pressure ball, is made, its dosage is 0.01~0.02 ton/ton steel, and point 2~3 average additions, are spaced 2~3 minutes；AOD furnace decarburizing phase smelting temperature is 1560~1620 DEG C；Lime is added in the desulfurized alloy stage, lime adding amount is 0.04~0.06 ton/ton steel.The method of the present invention replaces manganese alloy with bannisterite, can effectively reduce production cost, and can ensure that Molten Steel Cleanliness, while can directly omit Manganese alloy production link, reduces environmental pollution.
Description
Technical field
The present invention relates to stainless steel smelting field, more particularly to a kind of method of 304 stainless steel of AOD converter smeltings.
Background technology
The core of stainless steel smelting technology is " decarburization and cr yield ", and the stainless steel smelting equipment of mainstream is AOD furnace.From AOD furnace
Smelting process see, be broadly divided into following five stages：
1) sial oxidation stage；2) main decarburizing phase；3) dynamic decarburizing phase (3~4 stages can be sub-divided into)；4) also
The former stage；5) desulfurized alloy.
When the prior art produces 304 type of stainless steel, in the AOD furnace smelting reducing stage, to make AOD tapping molten steel Mn elements
Reach certain component requirements, it is necessary to a certain amount of manganese alloy is added in reduction phase, and manganese alloy price is high so that production
Cost is very high, simultaneously because it is existing manganese alloy complex manufacturing technology, expensive, but environmental pollution is serious, therefore in certain journey
The scale application of the type manganese alloy is constrained on degree, is especially unsuitable in the minimum market ring of stainless steel smelting profit margin
Used under border.
The content of the invention
It is an object of the invention to provide a kind of method of 304 stainless steel of AOD converter smeltings, replaces manganese to close with bannisterite
Gold, can effectively reduce production cost, and can ensure that Molten Steel Cleanliness, while can directly omit Manganese alloy production link, reduce
Environmental pollution.
To reach above-mentioned purpose, the technical scheme is that：
A kind of method of 304 stainless steel of AOD converter smeltings, including：1) sial oxidation stage；2) main decarburizing phase；3) move
State decarburizing phase；4) reduction phase；5) desulfurized alloy；Match somebody with somebody bannisterite ball it is characterized in that being added in reduction phase, silicomanganese should be matched somebody with somebody
Ore deposit ball presses 7 using the manganese mineral powder of percentage composition containing manganese 25~40% with ferrosilicon powder：3, which carry out mixing pressure ball, is made, its dosage is
0.01~0.02 ton/ton steel, point 2~3 average additions, is spaced 2~3 minutes；AOD furnace smelting temperature is 1560~1620 DEG C；
Lime is added in the desulfurized alloy stage, lime adding amount is 0.04~0.06 ton/ton steel.
Preferential, the present invention is with bannisterite ball component content percentage：Mn 25~40%, Fe 25~40%, Si 17
~25%, Al2O30~8%, P 0~0.1%, SiO20~10%, H2O 0~2%.
[Mn] content requirement is 1.1wt% in 304 stainless steels, AOD tappings [Mn] require control 1.05%~1.2% it
Between, to make AOD tapping molten steel Mn elements reach the area requirement, it is necessary to add expensive manganese alloy in reduction phase, use
Price relative reduction can effectively reduce cost with bannisterite.But in the material, manganese element is present in manganese in the form of manganese oxide
In ore deposit, therefore also need to add substantial amounts of reducing agent in reduction phase and reduced.Aluminium and silicon are one in terms of reduction effect
Good reducing agent, it is of high cost due to aluminium, generally reduced using the silicon in ferrosilicon.And what is used in the present invention matches somebody with somebody
Bannisterite ball is that to be incorporated ferrosilicon powder in advance (be manganese mineral powder and ferrosilicon powder by 7 to manganese mineral powder：3, which carry out mixing pressure ball, is made), manganese will be reduced
Mining ferrosilicon is incorporated in advance, without extra computation and adds reduction silicon.Silicon in the material ferrosilicon powder can be by the Mn in manganese mineral powder
Element effectively reduces, and is allowed to alloying, so as to meet the Mn contents in molten steel, while effectively reduces production cost.
The mechanism of smelting process of the present invention be with in-furnace temperature, the proportioning of mixture and the granularity during raw material shove charge and he
Between chemical reaction it is related.
Main component of the present invention with bannisterite is manganese oxide, silicon.Manganese oxide produces manganese after being chemically reacted with silicon,
Manganese element, which enters back into, forms alloying in molten steel.Its reaction is：
Si+2MnO=2Mn+SiO2
According to calculation of thermodynamics surface, silicon can just chemically react more than certain temperature with manganese oxide, but chemical
Reaction depends not only on thermodynamics, related with kinetics when prior.The reduction rate of manganese oxide first with reduction
Agent species is related, secondly depends on response area.Response area is bigger, then reaction speed is faster, and the reduction process of manganese oxide is again
The reduction reaction of solid oxide manganese and solid state reduction agent silicon under low temperature can be divided into, between the manganese oxide and molten steel under high temperature in clinker
Reduction.When the lumpiness of manganese oxide is larger, the chemical reaction under low temperature is not reflected since contact area is too small,
Therefore reaction will be based on high temperature reduction, that is, reacts the later of progress.The granularity of manganese oxide is smaller in mixture of the present invention
(only between 5-70mm), it is mixed with reducing agent, will greatly improve response area, so that manganese oxide is compared with low temperature
The lower reaction of degree, you can realize and complete reduction reaction in smelting early stage.Manganese oxide is smelting early stage reduction with smelting later stage reduction
Compare, clinker boiling intensity can be reduced, shortened the heat, improve the recovery rate of manganese.
In the methods of the invention：
With in terms of bannisterite ball proportioning components, according to bannisterite ball physical and chemical index, according to above-mentioned content and Si reduction manganese
The chemical equation of ore deposit can calculate, and the manganese mineral powder that the present invention uses is with ferrosilicon powder by 7：3 carry out matching somebody with somebody silicon made of mixing pressure ball
Manganese ore ball, is proportionally to be incorporated the ferrosilicon for reducing manganese ore according to atomic weight and component content, without extra computation and throwing
Add reduction silicon.Therefore only manganese alloy need to be replaced with bannisterite with year-on-year according to the ratio of manganese content.
In terms of the time is added with bannisterite ball, present invention selection adds in the smelting reducing stage of AOD furnace.Such as in early period
Decarburizing phase is added it will cause manganese oxidation is serious, also results in duration of blast extension, and can cause in molten steel manganese oxide without
Method removes.In addition it can also cause sharp temperature drop in AOD furnace, cause later stage desulfurization difficult, while the oxidation manganese content in slag
Increase, destroys original slag structure.
Added in reduction phase and match somebody with somebody bannisterite ball, can prevent manganese element from aoxidizing.And the material is reacted according to silicon and manganese oxide
Ratio direct matching form, the silica flour in the material can directly be reduced manganese oxide in manganese ore, and (silica flour directly reduces
With), to meet the Mn constituent contents in molten steel.
Put into reduction phase and replace metal manganese alloy with bannisterite, because manganese content is up to 40% in the material, and manganese closes
Manganese content in gold is up to more than 99%, therefore after replacing in proportion, addition is about that manganese alloy is thrown with bannisterite dosage
3 times or so of dosage.Such big material moment is added in stove, and desulfurization stage in-furnace temperature can be caused to decline, and (temperature drop is about 15
~20 DEG C/t), therefore temperature control is improved 40~50 DEG C (i.e. original 1520 DEG C~1570 by the present invention in advance in decarburizing phase
Lifting is to 1560~1620 DEG C on the basis of DEG C), with the temperature drop for the reduction phase that makes corrections.While temperature is maked corrections, it is also noted that
It is added portionwise, since reduction phase, every 2~3 minutes plus once, add every time with 0.01~0.02 ton of bannisterite ball/
Ton steel.
In addition, after reduction phase adds and matches somebody with somebody bannisterite ball, substantial amounts of titanium dioxide will be produced after silica flour reduction-oxidation manganese
Silicon, can be caused necessarily to negatively affect to the basicity of clinker, therefore in desulfurization stage by adding lime, the AOD quantity of slag is tied
Structure optimizes, so that basicity is maintained at normal level, ensures the degree of purity of molten steel.
Beneficial effects of the present invention：
Compared with prior art, it is of the invention to replace expensive manganese alloy with bannisterite, according to certain with frequently
Example is added in reduction phase, is fully achieved the requirement of stainless steel smelting, be can guarantee that the requirement of Molten Steel Cleanliness.Due to silicon
Manganese ore ball silicone content and manganese content are higher, at present using pressure ball method just can obtain stable content and it is higher match somebody with somebody bannisterite ball,
The size and intensity of granularity can be met the requirements, therefore be had on production cost is reduced and in raising production efficiency obvious excellent
Gesture.
Embodiment
With reference to embodiment, the present invention will be further described.
Using the method for the present invention, with bannisterite ball is matched somebody with somebody during 304 stainless steels are smelted, specific component is shown in Table 1, recovery rate
Data are referring to table 2.
Component of the experiment of table 1 with bannisterite ball
Remarks：Granularity with bannisterite ball is 42mm.
Table 2 tests recovery rate data (unit：t)
As above the three stove steel that data are shown, after reduction phase starts, were separately added into bannisterite ball every 3 minutes
2.06 tons, 2.20 tons, 1.98 tons, amount of lime is separately added into as 6 tons, 5.8 tons, 7 tons in desulfurization stage, while in order to prevent also
Former stage, which is added after furnace charge, reduces in-furnace temperature, decarburizing phase temperature maked corrections in advance respectively to 1575 DEG C, 1580 DEG C,
1602 DEG C (improving 40 DEG C on the basis of original).By calculating, the manganese yield of the three stoves steel can reach substantially
94% level, substantially close to the recovery rate of manganese metal (recovery rate of manganese metal is 95.6%).
MnO and other component content (units in 3 slag of table：Wt%)
As above slag assay situation is as it can be seen that MnO contents are very low in slag, within 0.60%, illustrates to match somebody with somebody in bannisterite ball
Manganese can be reduced sufficiently.And the same period adds the heat of manganese alloy in reduction phase, clinker MnO% average values are after it is reduced
0.36%；Both are substantially close to therefore Reduction of manganese ore is more abundant.
In addition, in terms of the Quality Feedback of 304 stainless-steel cold-rolling processes, slab quality is preferable, does not find similar squama folding, is mingled with
Class defect, has certain application value.
Claims (2)
1. a kind of method of 304 stainless steel of AOD converter smeltings, including：1) sial oxidation stage；2) main decarburizing phase；3) dynamic
Decarburizing phase；4) reduction phase；5) desulfurized alloy；Match somebody with somebody bannisterite ball it is characterized in that being added in reduction phase, bannisterite should be matched somebody with somebody
Ball presses 7 using the manganese mineral powder of percentage composition containing manganese 25~40% with ferrosilicon powder：3, which carry out mixing pressure ball, is made, its dosage is
0.01~0.02 ton/ton steel, point 2~3 average additions, adds interval 2~3 minutes every time；AOD furnace decarburizing phase smelting temperature
For 1560~1620 DEG C；In the desulfurized alloy stage to adjust basicity, add lime, lime adding amount for 0.04~0.06 ton/
Ton steel.
2. the method for 304 stainless steel of AOD converter smeltings as claimed in claim 1, it is characterized in that, it is described with bannisterite ball into
Point percentage by weight is：Mn 25~40%, Fe 25~40%, Si 17~25%, Al2O30~8%, P 0~0.1%,
SiO20~10%, H2O 0~2%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410280850.1A CN104109736B (en) | 2014-06-20 | 2014-06-20 | A kind of method of 304 stainless steel of AOD converter smeltings |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410280850.1A CN104109736B (en) | 2014-06-20 | 2014-06-20 | A kind of method of 304 stainless steel of AOD converter smeltings |
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| Publication Number | Publication Date |
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| CN104109736A CN104109736A (en) | 2014-10-22 |
| CN104109736B true CN104109736B (en) | 2018-05-04 |
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| CN201410280850.1A Expired - Fee Related CN104109736B (en) | 2014-06-20 | 2014-06-20 | A kind of method of 304 stainless steel of AOD converter smeltings |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107236842A (en) * | 2017-05-22 | 2017-10-10 | 山西太钢不锈钢股份有限公司 | A kind of method of electric furnace alloying of manganese during smelting stainless steel |
| EP3633051B1 (en) * | 2017-05-25 | 2021-11-17 | JFE Steel Corporation | Method for manufacturing high manganese steel ingot |
| CN112853042B (en) * | 2021-01-06 | 2022-10-18 | 鞍钢股份有限公司 | Method for increasing manganese in high manganese steel smelting process |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1415766A (en) * | 2002-10-10 | 2003-05-07 | 吴光亮 | Composite ball rolls of manganese and its preparation method |
| CN103074551A (en) * | 2013-01-14 | 2013-05-01 | 浙江大学 | Two-phase stainless steel alloy and preparation method thereof |
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2014
- 2014-06-20 CN CN201410280850.1A patent/CN104109736B/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1415766A (en) * | 2002-10-10 | 2003-05-07 | 吴光亮 | Composite ball rolls of manganese and its preparation method |
| CN103074551A (en) * | 2013-01-14 | 2013-05-01 | 浙江大学 | Two-phase stainless steel alloy and preparation method thereof |
Non-Patent Citations (1)
| Title |
|---|
| "AOD全铁水冶炼不锈钢的配料模拟";胡汉涛 等;《钢铁研究学报》;20081031;第20卷(第10期);第6-8、12页 * |
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