CN105483314B - A kind of control method for improving the residual manganese content of converter terminal - Google Patents
A kind of control method for improving the residual manganese content of converter terminal Download PDFInfo
- Publication number
- CN105483314B CN105483314B CN201610006870.9A CN201610006870A CN105483314B CN 105483314 B CN105483314 B CN 105483314B CN 201610006870 A CN201610006870 A CN 201610006870A CN 105483314 B CN105483314 B CN 105483314B
- Authority
- CN
- China
- Prior art keywords
- converter
- percentage composition
- steel
- terminal
- residual manganese
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Classifications
-
- 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
- C21C5/32—Blowing from above
Abstract
A kind of control method for improving the residual manganese content of converter terminal, belongs to top-blown converter steelmaking technical field.The molten iron used produces HRB400 reinforcing bar steel for middle high phosphorus hot metal.Smelted in oxygen top-blown converter using single slag technique.Converter smelting process route is：Add steel scrap, molten iron-dephosphorization decarburization-converter tapping.Rifle position, the quantity of slag, finishing slag all iron content and terminal component and temperature are smelted by controlling.On the premise of dephosphorization effect is ensured, the recovery rate of residual manganese is 50~58%.Advantage is, by reducing rifle position, strengthens stirring, is conducive to the reduction of MnO in clinker, while residual manganese is improved, phosphorus content is met steel grade requirement.
Description
Technical field
The invention belongs to top-blown converter steelmaking technical field, more particularly to a kind of control for improving the residual manganese content of converter terminal
Method.Used molten iron is middle high phosphorus hot metal (0.13~0.15%), and the steel grade of production is HRB400.Arranged by modified technique
Apply and improve the residual manganese content of converter terminal, to reduce addition manganeisen.
Background technology
Improve the residual manganese mass fraction of converter terminal molten steel, it is possible to reduce the consumption of manganeisen used in alloying process, this
It is the important means for reducing STEELMAKING PRODUCTION cost.Manganese of the manganese in molten iron in converter, during bessemerizing, in gold
Belong to oxidation and the reduction reaction that manganese occurs between molten bath, slag and oxygen, residual manganese of the final residue in converter terminal molten steel by
The influence of the factors such as the quantity of slag, converter terminal carbon, slag beneficiation, converter terminal temperature.
, will in the technique for improving residual manganese since our factory is using middle high phosphorus hot metal (0.13~0.15%) production of low cost
Consider the influence factor of dephosphorization.And some operation thinkings for improving residual manganese have dephosphorization negative effect, such as basicity, the quantity of slag, end
Point temperature, endpoint carbon content, the influence of endpoint molten steel oxidisability etc., therefore very big difficulty is brought to residual manganese work is improved,
The condition that residual manganese considers dephosphorization again that improves is considered during process implementing, meets the needs of dephosphorization.
The residual manganese of converter terminal is improved from the point of view of document following several ways：
1st, temperature rise can increase (MnO) from the reduction rate in slag, as w (FeO) in temperature and (MnO) one timing, slag
Higher, residual manganese is then lower, and as w (FeO) and the timing of temperature one, then w (MnO) is higher, and residual manganese is higher.Document (chief editor Bao Yanping,
《Metallurgy of iron and steel study course》, metallurgical industry publishing house, in July, 2008, P208)
2nd, converter terminal carbon is higher, and manganese yield is also higher；Molten iron initial silicon content is lower, the converter quantity of slag with regard to smaller,
Also be more conducive to the reduction of manganese and improve the recovery rate of manganese.High temperature is conducive to the reduction of manganese in slag, but in catch carbon practice bar
Under part, reduction of the carbon content to manganese plays a leading role, and the influence of converter terminal temperature becomes not particularly significant.Converter, which is taken, to be subtracted
Few quantity of slag, it is ensured that after aim carbon is the optimization operation measure of main contents, raised in molten iron silicon content, molten iron manganese content is suitable
Under the conditions of, the residual manganese content of converter terminal and its receive and must significantly improve.Document (Xue Zhengliang, Wu Lijia, Wang Wei converter terminal molten steel
Analysis of Influential Factors [J] China of residual manganese content and manganese yield is metallurgical, 2011,27 (6)：40~43.).
3rd, to obtain more than 30% manganese yield, molten iron w (Si) should be less than 0.35%；Converter terminal w (C) should not be low
In 0.10%；The initial manganese of molten iron is higher, and the recovery rate of manganese is on a declining curve；Finishing slag w (FeO) is raised, and the recovery rate of manganese is in decline
Trend；Raised with converter finishing slag basicity, manganese yield is on a declining curve；Manganese is received in outlet temperature change after converter catch carbon practice
The influence of yield becomes not particularly significant.Document (the residual manganese mass fraction of Yang Chuanxin, Li Pengchao, Lu Zhao army converter terminal molten steel
And its analysis of Influential Factors [J] China is metallurgical, 2012,22 (11)：42~46.).
4th, as molten iron silicon content increases, the residual manganese content of converter terminal is decreased obviously.The residual manganese content of converter is with aim carbon
Content is raised and significantly raised.The residual manganese content of converter terminal is in increase trend with the rise of molten iron manganese content.The residual manganese of terminal is with end
Put the raising of temperature and rise, (FeO) is higher in slag, and residual manganese is then lower.(Fan Shulu, Zhou Pifu, leaf fly here converter smeltings document
It is scientific and technological to refine residual manganese analysis of Influential Factors [J] the Laigangs of endpoint molten steel, 2013,10：63~65.).
From the studies above as can be seen that carry high-temperature ﹑ improve endpoint carbon content and reduce slag in (FeO) be conducive to improve it is residual
Manganese.But with more than unlike each factory, our factory is higher it is also contemplated that dephosphorization, temperature is excessive to be unfavorable for taking off due to molten iron phosphorus content
Phosphorus, CaO content is excessive in slag can influence slugging, reduce in slag (FeO) and be unfavorable for dephosphorization.Therefore it should integrate and examine in actual production
Consider these factors.
The content of the invention
It is an object of the invention to provide a kind of control method for improving the residual manganese content of converter terminal.Solves reduction alloy
Used part manganeisen dosage during change, the problem of reducing cost.
Steel grade produced by the invention is HRB400 steel, and chemical analysis is by mass percentage：C：0.18-0.25%, Si：
0.35-0.60%, Mn：1.25-1.55%, P≤0.035, S≤0.035, V：0.030-0.045%, remaining is Fe and can not keep away
The impurity exempted from.
Specific steps and parameter are as follows：
1) percentage of the percentage composition 0.4~0.6wt%, Mn of the percentage composition 4.2~4.5wt%, Si of molten iron C used in contain
Measure 0.2~0.60wt%, 0.015~0.025wt% of percentage composition of the percentage composition 0.13~0.15wt%, S of P, temperature
1310±10℃；
2) steel scrap, hot metal charging are loaded in converter, charge weight is 63~67 tons of molten iron, and 6~8 tons of steel scraps, shake straight converter；
3) situation is supplied oxygen in converter steelmaking process is：For the oxygen lance nozzle exit Mach number used for 2.0, orifice number is 4 holes,
Angle is 12 degree 40 and divides between hole；Oxygen supply by lance intensity is 3.5~3.8Nm3/ mint, oxygen is voltage-controlled to be made in 0.85~0.90MPa,
Using low rifle position operate, early period 1.1~1.3 meters of rifle position, 1.4~2.0 meters of mid-term rifle position, 0.9 meter of terminal rifle position, terminal drop rifle when
Between be 2 minutes.
4) lime adding amount is controlled according to 50~70kg/t steel, and ore addition is controlled according to 10~20kg/t steel；
5) bessemerizing outlet temperature is：1650~1670 DEG C, the full weight of iron percentage composition of clinker is 9~13%, control
Clinker target dual alkalinity processed is 3.0~3.5；
6) control of aim carbon percentage composition is 0.08~0.10%, and the recovery rate of residual manganese is 50~58%.
Compared with the currently used ferrophosphorus water for bessemerizing lower content improves residual manganese technology, the present invention has following excellent
Point：
1) by reducing rifle position, strengthen stirring, be conducive in clinker the reduction of (MnO).
2) by controlling the suitable quantity of slag, temperature, basicity, w (TFe) and carbon content to realize.
3) consider the factor of dephosphorization, while residual manganese is improved, phosphorus content is met steel grade requirement.
Embodiment
The present invention smelts the work that high phosphorus hot metal production concrete-steel (HRB400) improves residual manganese on 70 tons of oxygen top-blown converters
Skill key parameter example, but protection scope of the present invention is not limited in following embodiments.
Embodiment 1
The percentage composition 0.55wt% of the percentage composition 0.44wt%, Mn of the percentage composition 4.3wt%, Si of molten iron C used,
The percentage composition 0.019wt% of the percentage composition 0.139wt%, S of P, 1312 DEG C of temperature；Charge weight is 63 tons of molten iron, and 8.2 tons useless
Steel；Add lime 54.02kg/t steel, ore addition 22.0kg/t steel.Early period 1.2 meters of rifle position, 1.4~2.0 meters of mid-term rifle position,
0.9 meter of terminal rifle position, terminal drop rifle time are 2 minutes.The percentage composition of the percentage composition 0.09wt%, Mn of terminal C
0.28wt%, 1680 DEG C of temperature；The full weight of iron percentage composition of clinker is 11.5%, clinker dual alkalinity 3.1；Residual manganese is received
Rate is 51.3%.
Embodiment 2
The percentage composition 0.53wt% of the percentage composition 0.48wt%, Mn of the percentage composition 4.3wt%, Si of molten iron C used,
The percentage composition 0.018wt% of the percentage composition 0.138wt%, S of P, 1310 DEG C of temperature；Charge weight is 64 tons of molten iron, and 8.7 tons useless
Steel；Add lime 60.88kg/t steel, ore addition 15.0kg/t steel.Early period 1.2 meters of rifle position, 1.4~2.0 meters of mid-term rifle position,
0.9 meter of terminal rifle position, terminal drop rifle time are 2 minutes.The percentage composition of the percentage composition 0.08wt%, Mn of terminal C
0.27wt%, 1683 DEG C of temperature；The full weight of iron percentage composition of clinker is 12.1%, clinker dual alkalinity 3.2；Residual manganese is received
Rate is 50.3%.
Embodiment 3
The percentage composition 0.55wt% of the percentage composition 0.54wt%, Mn of the percentage composition 4.4wt%, Si of molten iron C used,
The percentage composition 0.020wt% of the percentage composition 0.146wt%, S of P, 1311 DEG C of temperature；Charge weight is 64 tons of molten iron, and 8.2 tons useless
Steel；Add lime 65.35kg/t steel, ore addition 20.7kg/t steel.Early period 1.2 meters of rifle position, 1.4~2.0 meters of mid-term rifle position,
0.9 meter of terminal rifle position, terminal drop rifle time are 2 minutes.The percentage composition of the percentage composition 0.10wt%, Mn of terminal C
0.31wt%, 1679 DEG C of temperature；The full weight of iron percentage composition of clinker is 11.3%, clinker dual alkalinity 3.1；Residual manganese is received
Rate is 56.1%.
Claims (1)
1. a kind of control method for improving the residual manganese content of converter terminal, it is characterised in that specific steps and parameter are as follows：
1) percentage composition of the percentage composition 0.4~0.6wt%, Mn of the percentage composition 4.2~4.5wt%, Si of molten iron C used in
0.015~0.025wt% of percentage composition of the percentage composition 0.13~0.15wt%, S of 0.2~0.60wt%, P, temperature 1310
±10℃；
2) steel scrap, hot metal charging are loaded in converter, charge weight is 63~67 tons of molten iron, and 6~8 tons of steel scraps, shake straight converter；
3) converter steelmaking process, for the oxygen lance nozzle exit Mach number used for 2.0, orifice number is 4 holes, and angle is 12 degree 40 between hole
Point；Oxygen supply by lance intensity is 3.5~3.8Nm3/ mint, oxygen is voltage-controlled to be made in 0.85~0.90MPa, is operated using low rifle position, preceding
1.1~1.3 meters of phase rifle position, 1.4~2.0 meters of mid-term rifle position, 0.9 meter of terminal rifle position, terminal drop rifle time are 2 minutes；
4) lime adding amount is controlled according to 50~70kg/t steel, and ore addition is controlled according to 10~20kg/t steel；
5) outlet temperature is bessemerized as 1650~1670 DEG C, and the full weight of iron percentage composition of clinker is 9~13%, controls clinker
Target dual alkalinity is 3.0~3.5；
6) control of aim carbon percentage composition is 0.08~0.10%, and the recovery rate of residual manganese is 50~58%；
The steel grade produced is HRB400 steel, and chemical analysis is by mass percentage：C：0.18-0.25%, Si：0.35-
0.60%, Mn：1.25-1.55%, P≤0.035, S≤0.035, V：0.030-0.045%, remaining is for Fe and inevitably
Impurity.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610006870.9A CN105483314B (en) | 2016-01-04 | 2016-01-04 | A kind of control method for improving the residual manganese content of converter terminal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610006870.9A CN105483314B (en) | 2016-01-04 | 2016-01-04 | A kind of control method for improving the residual manganese content of converter terminal |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105483314A CN105483314A (en) | 2016-04-13 |
| CN105483314B true CN105483314B (en) | 2018-04-24 |
Family
ID=55670585
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610006870.9A Active CN105483314B (en) | 2016-01-04 | 2016-01-04 | A kind of control method for improving the residual manganese content of converter terminal |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105483314B (en) |
Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108396093A (en) * | 2017-02-05 | 2018-08-14 | 鞍钢股份有限公司 | A method of improving the residual manganese content of converter terminal molten steel |
| CN110621793A (en) * | 2017-05-25 | 2019-12-27 | 杰富意钢铁株式会社 | Smelting method of high manganese steel |
| CN109161633B (en) * | 2018-09-30 | 2020-03-20 | 武钢集团昆明钢铁股份有限公司 | Preparation method for extracting carbon from medium-manganese high-phosphorus iron water and protecting manganese in converter smelting |
| CN109136452B (en) * | 2018-09-30 | 2020-04-10 | 武钢集团昆明钢铁股份有限公司 | Converter smelting method for molten steel residual manganese at high-manganese high-silicon iron water extraction and improvement end point |
| CN109112249B (en) * | 2018-09-30 | 2020-02-07 | 武钢集团昆明钢铁股份有限公司 | Converter smelting method for molten steel residual manganese at medium-high manganese iron water increase end point |
| CN109385503B (en) * | 2018-12-06 | 2021-01-05 | 云南玉溪仙福钢铁（集团）有限公司 | Carbon-manganese-protecting converter steelmaking process |
| CN114622054B (en) * | 2022-03-04 | 2022-10-04 | 山东钢铁集团永锋临港有限公司 | Method for improving converter end-point manganese ratio |
| CN115125352A (en) * | 2022-06-20 | 2022-09-30 | 邯郸钢铁集团有限责任公司 | Method for improving later dephosphorization efficiency during smelting IF steel by adopting high-manganese molten iron |
| CN115354110A (en) * | 2022-08-08 | 2022-11-18 | 山东莱钢永锋钢铁有限公司 | Terminal gun pressing method for improving recovery rate of converter alloy |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101899604B (en) * | 2010-08-03 | 2012-04-04 | 武汉科技大学 | Direct alloying steelmaking process for manganese oxide composite briquettes used for re-blowing revolving furnace |
-
2016
- 2016-01-04 CN CN201610006870.9A patent/CN105483314B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN105483314A (en) | 2016-04-13 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN105483314B (en) | A kind of control method for improving the residual manganese content of converter terminal | |
| CN102776313B (en) | Method for smelting high-phosphorus steel by low-temperature low-silicon molten iron in converter | |
| CN100507022C (en) | Method for AOD whole melted iron directly smelting austenitic stainless steel | |
| CN102559985B (en) | Method of smelting low-phosphorus steel through converter | |
| CN100453657C (en) | Mono-slag converter process for producing high carbon low-phosphorus molten steel | |
| CN102199682A (en) | Semisteel steelmaking method | |
| CN109097522B (en) | Converter smelting method for molten steel residual manganese at medium-high manganese, high phosphorus and low silicon iron water extraction and improvement end point | |
| CN106148631B (en) | A kind of method of the ultralow nitrogen molten steel of converter smelting low-sulfur | |
| CN103627842A (en) | Method for enhancing end point carbon content in smelting medium-carbon steel from semisteel and semisteel steelmaking method | |
| CN103352101A (en) | Low-cost smelting technology of converter | |
| CN103642971A (en) | Method for improving steelmaking end-point carbon content of semisteel and semisteel steelmaking method | |
| CN110117689A (en) | A method of based on high-silicon molten iron converter double slag process low phosphorus steel by smelting | |
| CN103627839A (en) | Semisteel steelmaking carbon content control method and semisteel steelmaking method | |
| CN103421923B (en) | A kind of smelting process of vanadium-bearing hot metal | |
| CN103642966B (en) | Method for improving high-carbon high-manganese steel converter smelting endpoint carbon content and steelmaking method | |
| CN104946845B (en) | Method for producing high-carbon-chrome bearing steel from vanadium-titanium-containing molten iron | |
| CN107034421A (en) | Highly corrosion resistant high tensile reinforcement and its converter manufacture method | |
| CN103627851A (en) | Semisteel steelmaking temperature control method and semisteel steelmaking method | |
| CN104263875B (en) | A kind of top blown converter adopts high phosphorus hot metal to produce the dephosphorizing method of alloy bonding wire steel | |
| CN103409595A (en) | Dephosphorization and steel-making method of vanadium-containing molten iron | |
| CN103205522B (en) | Method for smelting plain carbon steel from semi-steel | |
| CN104109727A (en) | Method for smelting low-phosphorous steel by using semisteel through converter | |
| CN101864508B (en) | Steel making method of convertor with small slag quantity | |
| CN110699511A (en) | Method for smelting high-silicon molten iron | |
| CN107746906A (en) | A kind of technique for carrying out pneumatic steelmaking deoxidation alloying using high-manganese pig iron |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CP01 | Change in the name or title of a patent holder |
Address after: 100041 Shijingshan Road, Shijingshan District, Shijingshan District, Beijing Patentee after: Shougang Group Co. Ltd. Address before: 100041 Shijingshan Road, Shijingshan District, Shijingshan District, Beijing Patentee before: Capital Iron & Steel General Company |
|
| CP01 | Change in the name or title of a patent holder |