CN105483314A - Control method for increasing left manganese content of converter end point - Google Patents
Control method for increasing left manganese content of converter end point Download PDFInfo
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- CN105483314A CN105483314A CN201610006870.9A CN201610006870A CN105483314A CN 105483314 A CN105483314 A CN 105483314A CN 201610006870 A CN201610006870 A CN 201610006870A CN 105483314 A CN105483314 A CN 105483314A
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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
- C21C5/32—Blowing from above
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Abstract
The invention belongs to the technical field of top-blown converter steel making, and relates to a control method for increasing the left manganese content of a converter end point. Adopted molten iron is medium-high phosphor molten iron, and steel for HRB400 steel bars is produced. Smelting is carried out in an LD converter through the single-slag technology. The converter smelting technology paths include waste steel and molten iron adding, phosphor and carbon removing and converter tapping. The smelting gun position, the slag amount, the final slag total-iron content, the end point component and the temperature are controlled, and on the premise that the phosphor removing effect is guaranteed, the yield of left manganese is 50-58%. The control method has the advantages that the gun position is lowered, stirring is strengthened, reduction of MnO in slag is facilitated, the left manganese is improved, and the phosphor content meets the steel grade requirement.
Description
Technical field
The invention belongs to top-blown converter steelmaking technical field, particularly a kind of control method improving the residual Fe content of converter terminal.The molten iron adopted is middle high phosphorus hot metal (0.13 ~ 0.15%), and the steel grade of production is HRB400.Improve the residual Fe content of converter terminal by improving technique measure, reduce and add manganeseirom.
Background technology
Improve the residual manganese massfraction of converter terminal molten steel, can reduce the consumption of alloying process manganeseirom used, this is the important means reducing STEELMAKING PRODUCTION cost.Manganese in converter is mainly from the manganese in molten iron, bessemerize in process, in metal pool, the oxidation and induction reaction that manganese occurs between slag and oxygen, the residual manganese of final residue in converter terminal molten steel is by the impact of the factors such as the quantity of slag, converter terminal carbon, slag beneficiation, converter terminal temperature.
Because our factory adopts high phosphorus hot metal (0.13 ~ 0.15%) in low cost to produce, the influence factor of dephosphorization to be considered in the technique improving residual manganese.And some operation thinkings improving residual manganese have negative impact to dephosphorization, such as basicity, the quantity of slag, terminal temperature, endpoint carbon content, the impact etc. of endpoint molten steel oxidisability, bring very large difficulty therefore to the residual manganese work of raising, to consider in process implementing process and improve the condition that residual manganese considers dephosphorization again, meet the needs of dephosphorization.
Improve the residual manganese of converter terminal from document and have following several mode:
1, temperature raises can increase (MnO) from the reduction rate slag, when temperature and (MnO) one regularly, in slag, w (FeO) is higher, residual manganese is then lower, when w (FeO) and temperature one timing, then w (MnO) is higher, and residual manganese is higher.Document (chief editor Bao Yanping, " Ferrous metallurgy study course ", metallurgical industry press, in July, 2008, P208).
2, converter terminal carbon is higher, and manganese yield is also higher; Molten iron initial silicon content is lower, and the converter quantity of slag is less, is also more conducive to the reduction of manganese and improves the recovery rate of manganese.High temperature is conducive to the reduction of manganese in slag, but under catch carbon practice condition, the reduction of carbon content to manganese plays a leading role, and the impact of converter terminal temperature becomes very unimportant.Converter is taked to reduce the quantity of slag, guarantees that end point carbon is after the Optimizing operation measure of main contents, raises at molten iron silicon content, under the condition that molten iron Fe content is suitable, and the residual Fe content of converter terminal and receive significantly improve.Document (Xue Zhengliang, Wu Lijia, Wang Wei. the analysis of Influential Factors [J] of the residual Fe content of converter terminal molten steel and manganese yield. China is metallurgical, and 2011,27 (6): 40 ~ 43.).
3, want the manganese yield of acquisition more than 30%, molten iron w (Si) should lower than 0.35%; Converter terminal w (C) should be not less than 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) raises, and the recovery rate of manganese is on a declining curve; Raise with converter finishing slag basicity, manganese yield is on a declining curve; After converter catch carbon practice, terminal temperature change becomes very unimportant to the impact of manganese yield.Document (Yang Chuanxin, Li Pengchao, Lu Zhaojun. the residual manganese massfraction of converter terminal molten steel and analysis of Influential Factors [J] thereof. China is metallurgical, and 2012,22 (11): 42 ~ 46.).
4, along with molten iron silicon content increases, the residual Fe content of converter terminal obviously declines.The residual Fe content of converter raises along with endpoint carbon content and significantly raises.The residual Fe content of converter terminal is increase trend with the rising of molten iron Fe content.The residual manganese of terminal rises with the raising of terminal temperature, and in slag, (FeO) is higher, and residual manganese is then lower.Document (Fan Shulu, Zhou Pifu, leaf flies here. the residual manganese analysis of Influential Factors [J] of converter smelting endpoint molten steel. and Laigang science and technology, 2013,10:63 ~ 65.).
As can be seen from above-mentioned research, carry (FeO) in high-temperature ﹑ raising endpoint carbon content and reduction slag and be conducive to improving residual manganese.But and above each factory unlike, our factory also will consider dephosphorization because molten iron phosphorus content is higher, and temperature is too high is unfavorable for dephosphorization, and in slag, CaO too high levels can impact slag, reduces (FeO) in slag and is unfavorable for dephosphorization.Therefore these factors should be considered in actual production.
Summary of the invention
The object of the present invention is to provide a kind of control method improving the residual Fe content of converter terminal.Solve the part manganeseirom consumption reducing and use in alloying process, the problem reduced costs.
The steel grade that the present invention produces is HRB400 steel, and Chemical Composition 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%, and all the other are Fe and inevitable impurity.
Concrete steps and parameter as follows:
1) the percentage composition 0.015 ~ 0.025wt% of the percentage composition 0.13 ~ 0.15wt% of the percentage composition 0.2 ~ 0.60wt% of the percentage composition 0.4 ~ 0.6wt% of the percentage composition 4.2 ~ 4.5wt% of molten iron C used, Si, Mn, P, S, temperature 1310 ± 10 DEG C;
2) load steel scrap, hot metal charging in converter, Intake Quantity is 63 ~ 67 tons of molten iron, and 6 ~ 8 tons of steel scraps, shake straight converter;
3) in converter steelmaking process, oxygen supply situation is: the oxygen lance blow head exit Mach number of employing is 2.0, and orifice number is 4 holes, and between hole, angle is 12 degree 40 points; Oxygen supply by lance intensity is 3.5 ~ 3.8Nm
3/ mint, oxygen pressure-controlled, at 0.85 ~ 0.90MPa, adopts low rifle bit manipulation, in earlier stage 1.1 ~ 1.3 meters, rifle position, and 1.4 ~ 2.0 meters, rifle in mid-term position, 0.9 meter, terminal rifle position, it is 2 minutes that the rifle time falls in terminal.
4) lime adding amount controls according to 50 ~ 70kg/t steel, and ore add-on controls according to 10 ~ 20kg/t steel;
5) bessemerizing terminal temperature is: 1650 ~ 1670 DEG C, and the full weight of iron percentage composition of slag is 9 ~ 13%, and controlling slag target dual alkalinity is 3.0 ~ 3.5;
6) end point carbon percentage composition controls is 0.08 ~ 0.10%, and the recovery rate of residual manganese is 50 ~ 58%.
Compared with the high residual manganese technology of the ferrophosphorus water extraction of bessemerizing lower aq conventional at present, tool of the present invention has the following advantages:
1) by reducing rifle position, adding strong mixing, being conducive to the reduction of (MnO) in slag.
2) realize by controlling the suitable quantity of slag, temperature, basicity, w (TFe) and carbon content.
3) consider the factor of dephosphorization, while the residual manganese of raising, make phosphorus content meet steel grade requirement.
Embodiment
The present invention smelts high phosphorus hot metal and produces the technology key examples of parameters that reinforced bar steel (HRB400) improves residual manganese on 70 tons of top-blown oxygen converters, but protection scope of the present invention is not limited in following examples.
Embodiment 1
The percentage composition 0.019wt% of the percentage composition 0.139wt% of the percentage composition 0.55wt% of the percentage composition 0.44wt% of the percentage composition 4.3wt% of molten iron C used, Si, Mn, P, S, temperature 1312 DEG C; Intake Quantity is 63 tons of molten iron, 8.2 tons of steel scraps; Add lime 54.02kg/t steel, ore add-on 22.0kg/t steel.In earlier stage 1.2 meters, rifle position, 1.4 ~ 2.0 meters, rifle in mid-term position, 0.9 meter, terminal rifle position, it is 2 minutes that the rifle time falls in terminal.The percentage composition 0.28wt% of the percentage composition 0.09wt% of terminal C, Mn, temperature 1680 DEG C; The full weight of iron percentage composition of slag is 11.5%, slag dual alkalinity 3.1; The recovery rate of residual manganese is 51.3%.
Embodiment 2
The percentage composition 0.018wt% of the percentage composition 0.138wt% of the percentage composition 0.53wt% of the percentage composition 0.48wt% of the percentage composition 4.3wt% of molten iron C used, Si, Mn, P, S, temperature 1310 DEG C; Intake Quantity is 64 tons of molten iron, 8.7 tons of steel scraps; Add lime 60.88kg/t steel, ore add-on 15.0kg/t steel.In earlier stage 1.2 meters, rifle position, 1.4 ~ 2.0 meters, rifle in mid-term position, 0.9 meter, terminal rifle position, it is 2 minutes that the rifle time falls in terminal.The percentage composition 0.27wt% of the percentage composition 0.08wt% of terminal C, Mn, temperature 1683 DEG C; The full weight of iron percentage composition of slag is 12.1%, slag dual alkalinity 3.2; The recovery rate of residual manganese is 50.3%.
Embodiment 3
The percentage composition 0.020wt% of the percentage composition 0.146wt% of the percentage composition 0.55wt% of the percentage composition 0.54wt% of the percentage composition 4.4wt% of molten iron C used, Si, Mn, P, S, temperature 1311 DEG C; Intake Quantity is 64 tons of molten iron, 8.2 tons of steel scraps; Add lime 65.35kg/t steel, ore add-on 20.7kg/t steel.In earlier stage 1.2 meters, rifle position, 1.4 ~ 2.0 meters, rifle in mid-term position, 0.9 meter, terminal rifle position, it is 2 minutes that the rifle time falls in terminal.The percentage composition 0.31wt% of the percentage composition 0.10wt% of terminal C, Mn, temperature 1679 DEG C; The full weight of iron percentage composition of slag is 11.3%, slag dual alkalinity 3.1; The recovery rate of residual manganese is 56.1%.
Claims (2)
1. improve a control method for the residual Fe content of converter terminal, it is characterized in that, concrete steps and parameter as follows:
1) the percentage composition 0.015 ~ 0.025wt% of the percentage composition 0.13 ~ 0.15wt% of the percentage composition 0.2 ~ 0.60wt% of the percentage composition 0.4 ~ 0.6wt% of the percentage composition 4.2 ~ 4.5wt% of molten iron C used, Si, Mn, P, S, temperature 1310 ± 10 DEG C;
2) load steel scrap, hot metal charging in converter, Intake Quantity is 63 ~ 67 tons of molten iron, and 6 ~ 8 tons of steel scraps, shake straight converter;
3) converter steelmaking process, the oxygen lance blow head exit Mach number of employing is 2.0, and orifice number is 4 holes, and between hole, angle is 12 degree 40 points; Oxygen supply by lance intensity is 3.5 ~ 3.8Nm
3/ mint, oxygen pressure-controlled, at 0.85 ~ 0.90MPa, adopts low rifle bit manipulation, in earlier stage 1.1 ~ 1.3 meters, rifle position, 1.4 ~ 2.0 meters, rifle in mid-term position, 0.9 meter, terminal rifle position, and it is 2 minutes that the rifle time falls in terminal;
4) lime adding amount controls according to 50 ~ 70kg/t steel, and ore add-on controls according to 10 ~ 20kg/t steel;
5) bessemerizing terminal temperature is 1650 ~ 1670 DEG C, and the full weight of iron percentage composition of slag is 9 ~ 13%, and controlling slag target dual alkalinity is 3.0 ~ 3.5;
6) end point carbon percentage composition controls is 0.08 ~ 0.10%, and the recovery rate of residual manganese is 50 ~ 58%.
2. method according to claim 1, it is characterized in that, the steel grade produced is HRB400 steel, Chemical Composition 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%, all the other are Fe and inevitable impurity.
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Cited By (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 | Method for improving residual manganese content of molten steel at converter end point |
| CN109112249A (en) * | 2018-09-30 | 2019-01-01 | 武钢集团昆明钢铁股份有限公司 | A kind of middle high manganese molten iron improves the converter smelting method of the residual manganese of endpoint molten steel |
| CN109136452A (en) * | 2018-09-30 | 2019-01-04 | 武钢集团昆明钢铁股份有限公司 | A kind of high manganese high-silicon molten iron improves the converter smelting method of the residual manganese of endpoint molten steel |
| CN109161633A (en) * | 2018-09-30 | 2019-01-08 | 武钢集团昆明钢铁股份有限公司 | Manganese high phosphorus hot metal proposes the preparation method that carbon protects manganese in a kind of converter smelting |
| CN109385503A (en) * | 2018-12-06 | 2019-02-26 | 云南玉溪仙福钢铁（集团）有限公司 | It protects carbon and protects manganese converter steelmaking process |
| CN110621793A (en) * | 2017-05-25 | 2019-12-27 | 杰富意钢铁株式会社 | Smelting method of high manganese steel |
| CN114622054A (en) * | 2022-03-04 | 2022-06-14 | 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 |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101899604A (en) * | 2010-08-03 | 2010-12-01 | 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
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101899604A (en) * | 2010-08-03 | 2010-12-01 | 武汉科技大学 | Direct alloying steelmaking process for manganese oxide composite briquettes used for re-blowing revolving furnace |
Non-Patent Citations (2)
| Title |
|---|
| 范树璐等: "转炉冶炼终点钢水残锰影响因素分析", 《莱钢科技》 * |
| 郑毅等: "提高转炉终点残锰含量的生产实践", 《第十八届全国炼钢学术会议论文集》 * |
Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108396093A (en) * | 2017-02-05 | 2018-08-14 | 鞍钢股份有限公司 | Method for improving residual manganese content of molten steel at converter end point |
| CN110621793A (en) * | 2017-05-25 | 2019-12-27 | 杰富意钢铁株式会社 | Smelting method of high manganese steel |
| 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 |
| CN109161633A (en) * | 2018-09-30 | 2019-01-08 | 武钢集团昆明钢铁股份有限公司 | Manganese high phosphorus hot metal proposes the preparation method that carbon protects manganese in a kind of converter smelting |
| CN109136452A (en) * | 2018-09-30 | 2019-01-04 | 武钢集团昆明钢铁股份有限公司 | A kind of high manganese high-silicon molten iron improves the converter smelting method of the residual manganese of endpoint molten steel |
| CN109112249A (en) * | 2018-09-30 | 2019-01-01 | 武钢集团昆明钢铁股份有限公司 | A kind of middle high manganese molten iron improves the converter smelting method of the residual manganese of endpoint molten 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 |
| CN109385503A (en) * | 2018-12-06 | 2019-02-26 | 云南玉溪仙福钢铁（集团）有限公司 | It protects carbon and protects manganese converter steelmaking process |
| 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 |
| CN114622054A (en) * | 2022-03-04 | 2022-06-14 | 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 |
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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 |