CN103642979A - Using method of silicon-aluminum alloy - Google Patents
Using method of silicon-aluminum alloy Download PDFInfo
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- CN103642979A CN103642979A CN201310678084.XA CN201310678084A CN103642979A CN 103642979 A CN103642979 A CN 103642979A CN 201310678084 A CN201310678084 A CN 201310678084A CN 103642979 A CN103642979 A CN 103642979A
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Abstract
The invention relates to a using method of a silicon-aluminum alloy, particularly relates to smelting of low-carbon steel by a converter and belongs to the technical field of converter steel-making in metallurgical industry. The technical scheme is as follows: the silicon-aluminum alloy comprises the following chemical element components in percentage by weight: 25-30% of Si, 30-35% of Al, not more than 0.20% of C, not more than 0.03% of P, not more than 0.03% of S and the balance of iron and inevitable inclusions, and the particle size is 20-100mm; and in the tapping process, the silicon-aluminum alloy is added to perform deoxidization when the tapping process is performed till 1/4-1/3, and then a silicon-manganese alloy and a silicon-iron alloy are sequentially added when the tapping process is performed till 1/2; and as for the chemical components of the silicon-aluminum alloy, the content of silicon element is reasonably controlled on the basis of ensuring the content of aluminum content, then the silicon-aluminum element ratio in the silicon-aluminum alloy can better meet the deoxidization and the using quantity of alloyed material, which are required for production of the low-carbon steel, the process flow of process operation is simplified, the using efficiency of the alloy is improved, and the cost of production materials is reduced.
Description
Technical field
The present invention relates to a kind of silumin using method, especially converter smelting soft steel, belongs to metallurgy industry converter steeling technology field.
Background technology
At present, converter steelmaking, in smelting low carbon steel production process, adopts metallic aluminium or ferroaluminium deoxidation mostly, uses ferro-silicon to increase silicone content in molten steel, reaches the deoxidation object of alloying simultaneously.But in iron alloy, each element deoxidation efficiency or specific absorption are subject to the impacts such as molten steel oxidation, composition, temperature and iron alloy kind used, lumpiness, alloy joining day order.Therefore, different steel grades adopt different alloy proportions and using method very large to molten steel composition and steel product quality influence.The iron alloy forming for silicon, aluminium two elements, ferroaluminium deoxidizing capacity is strong, ferro-silicon deoxidizing capacity relatively a little less than.Rear strong a little less than deoxidation first in tapping process, can guarantee that deoxidation degree reaches steel grade requirement, can make again deoxidation products fully float, ensure the quality of products; A little less than after first strong, can greatly improve the specific absorption of the elements such as silicon, manganese, simultaneously also can corresponding minimizing deoxygenated alloy consumption, but deoxidation products floating difficulty relatively.Various iron alloy addition sequences and reasonably proportioning are to guarantee molten steel composition, up-to-standard important factor in order.Therefore, the iron alloy that manufacture contains two or more deoxidant elements had both facilitated production and application, was conducive to again the absorption of element, to improving dry steel quality, played a positive role.
Summary of the invention
The object of this invention is to provide a kind of silumin using method, for converter smelting soft steel, reach the object of alloy deoxidizer, improve Absorbing Alloy Element Rate, solve the problems referred to above that background technology exists.
Technical scheme of the present invention is:
A silumin using method, for converter smelting soft steel, comprises following processing step:
(1) converter smelting: molten iron packs after pretreatment top and bottom combined blown converter oxygen blast into and smelts;
(2) terminal is controlled: the converter terminal sampling of falling stove, and terminal composition and terminal temperature are tapped after meeting processing requirement;
(3) deoxidation alloying: tapping process adds silumin, silicomanganese and ferro-silicon;
(4) Argon and adjustment: the even molten steel composition of Argon station Argon, and adjust molten steel composition and oxygen level until meet smelt steel grade requirement;
Described silumin, the weight percent of its chemical element moiety is: Si=25-30%, Al=30-35%, C≤0.20%, P≤0.03%, S≤0.03%, all the other are iron and being inevitably mingled with, granularity is 20-100mm;
Described deoxidation alloying, tapping process adds silumin, silicomanganese and ferro-silicon, and in tapping, adding silumin, silumin add-on at 1/4 to 1/3 o'clock is 0.3-1.0 Kg/ ton steel; Tap and add successively silicomanganese and ferro-silicon at 1/2 o'clock;
Described Argon and adjustment, tapping process whole process is taked steel ladle bottom argon blowing operation, assurance adds silumin and molten steel fully to melt to react even, use aluminum steel to adjust ladle oxygen level, until meet smelted steel grade oxygen level, switch argon flow amount 80-120 NL/min, soft blow argon 3-5 minute, completes soft steel and smelts.
Silicomanganese and ferro-silicon add-on are adjusted according to smelted steel grades, until meet smelt steel grades, require.
Main innovate point of the present invention is: at tapping process, select tapping to add silumin to carry out deoxidation at 1/4 to 1/3 o'clock, then, tap and add successively silicomanganese and ferro-silicon at 1/2 o'clock, requirement simultaneously must first add silumin, after add silicomanganese and ferro-silicon, not only improve deoxidation efficiency, and can improve the specific absorption of alloying element.Under alloy deoxidation efficiency ratio the same terms of the present invention, use ferro-aluminum to improve 7ppm/10Kg; The specific absorption of element improves 1.3% than background technology.
Silicon, the action principle of aluminium in iron alloy deoxidation: utilize two or more reductors to add deoxidation of molten steel simultaneously, if there is complex deoxidization reaction, cause deoxidation constant to reduce, thereby strengthened the deoxidizing capacity of single-element, simultaneously some complex deoxidization product fusing point is lower, is easy to aggregate into large drop and floats, and the clarity of steel is improved, not only save aluminium successful, and simplified deoxidization technique operation.
Positively effect of the present invention is: silumin chemical composition is guaranteeing on the basis of aluminium element content, rationally control silicon content, make in iron alloy sial element ratio meet preferably soft steel and produce required deoxidation and alloying material usage, simplify technological operation flow process, improve alloy service efficiency, reduce production material cost.
Embodiment
Below by embodiment, the present invention will be further described.
A silumin using method, for converter smelting soft steel, comprises following processing step:
(1) converter smelting: molten iron packs after pretreatment top and bottom combined blown converter oxygen blast into and smelts;
(2) terminal is controlled: the converter terminal sampling of falling stove, and terminal composition and terminal temperature are tapped after meeting processing requirement;
(3) deoxidation alloying: add silumin at 1/4 to 1/3 o'clock in tapping, tap and add successively silicomanganese and ferro-silicon at 1/2 o'clock, described silumin add-on is 0.3-1.0 Kg/ ton steel, silicomanganese and ferrosilicon add-on are adjusted according to smelted steel grades, until meet smelt steel grades; Tapping process adds alloy;
(4) Argon and adjustment: tapping process whole process is taked steel ladle bottom argon blowing operation, assurance adds silumin and molten steel fully to melt to react even, use aluminum steel to adjust ladle oxygen level, until meet smelted steel grade oxygen level, switch argon flow amount 80-120 NL/min, soft blow argon 3-5 minute, completes soft steel and smelts.
Described silumin, the weight percent of its chemical element moiety is: Si=25-30%, Al=30-35%, C≤0.20%, P≤0.03%, S≤0.03%, all the other are iron and being inevitably mingled with, granularity is 20-100mm;
embodiment 1: use silumin smelting low carbon steel Q195L
Silumin, the weight percent of its chemical element moiety is: Si=26.3%, Al=33.8%, C=0.10%, P=0.02%, S=0.02%; Be packaged as 10 ± 0.3Kg; Granularity 20-100mm.
(1) converter smelting: steel melting furnace employing capacity is the top and bottom combined blown converter of 80 tons, Smelting number 13Y2-7577, pack 82.5 tons of molten iron, 1.84 tons of steel scraps into, smelting process adds 2.94 tons of limes, 3.2 tons, ore, 1.13 tons, magnesium ball, and the later stage is measured 78.8 tons of actual taps;
(2) terminal is controlled: a catch carbon terminal of converter [C] 0.056%, [Mn] 0.06%, [P] 0.020%, [S] 0.028%, [Si] are residual vestige, and 1651 ℃ of liquid steel temperatures, meet processing requirement;
(3) deoxidation alloying: connect ladle argon flow amount 120NL/min, start tapping, tap and start to add silumin 30Kg at 1/3 o'clock, tapping adds silicomanganese 350Kg to 1/2 o'clock from alloy feed bin;
(4) Argon and adjustment: alloy continues steel ladle bottom argon blowing after adding end; After tapping finishes, drive buggy ladle and to Argon station, continue Argon, adjust argon flow amount to 80 NL/min, after Argon 2min, determine oxygen 47ppm, meet this steel grade processing requirement; Continue Argon 3min, finish this stove smelting molten steel, close continuous caster cast on ladle argon gas, bull ladle, middle bag smelting component: [C] 0.07%, [Si] 0.06%, [Mn] 0.32%, [P] 0.022%, [S] 0.027%.Meet this steel grade chemical composition standard-required.
Use silumin and use the contrast of ferro-aluminum deoxidation efficiency: (identical or close converter smelting endpoint condition is rejected silicomanganese deoxidation impact according to unified calculation)
In the present embodiment, using as calculated the every 10Kg efficiency of silumin deoxidation is 52.6ppm; Add up the identical smelting endpoint condition data same period, using ferro-aluminum to carry out the every 10Kg efficiency of deoxidation is 44.2ppm; Use silumin than using many deoxidations of the every 10Kg of ferro-aluminum 8.4ppm.
Meanwhile, in silumin, element silicon is except deoxidation, and partial melting increases molten steel silicone content, improves element silicon specific absorption 3%.
embodiment 2: the soft steel GF08 that uses silumin to produce.
Silumin, the weight percent of its chemical element moiety is: Si=25%, Al=32%, C=0.11%, P=0.022%, S=0.022%; Be packaged as 10 ± 0.3Kg; Granularity 20-100mm.
(1) converter smelting: steel melting furnace employing capacity is the top and bottom combined blown converter of 80 tons.Smelting number 13Y1-6248, packs 77 tons of molten iron, 7.07 tons of steel scraps into, and smelting process adds 4.3 tons of limes, 2.5 tons, ore, 0.9 ton, magnesium ball, and the later stage is measured 78.2 tons of actual taps;
(2) terminal is controlled: a catch carbon terminal of converter [C] 0.058%, [Mn] 0.10%, [P] 0.038%, [S] 0.018%, [Si] they are residual vestige, 1704 ℃ of liquid steel temperatures, and wherein [P] do not meet processing requirement.Secondary charging falls and after rifle is re-blow, samples composition and be: [C] 0.043%, [Mn] 0.05%, [P] 0.023%, [S] 0.018%, [Si] are residual vestige, and 1675 ℃ of liquid steel temperatures, meet processing requirement;
(3) deoxidation alloying: connect ladle argon flow amount 120NL/min, start tapping, tap and start to add silumin 50Kg at 1/4 o'clock, tapping adds silicomanganese 420Kg and ferrosilicon 120Kg to 1/2 o'clock from alloy feed bin;
(4) Argon and adjustment: alloy continues steel ladle bottom argon blowing after adding end; After tapping finishes, drive buggy ladle and to Argon station, continue Argon, adjust argon flow amount to 80 NL/min.After Argon 2min, determine oxygen 73ppm, higher than meeting this steel grade processing requirement, be not more than 60ppm; At Argon station feeding aluminum steel 10m, silicon-calcium wire 150m, Argon 2min, ladle sampling chemical examination, result is [C] 0.06%, [Si] 0.14%, [Mn] 0.37%, [P] 0.023%, [S] 0.020%.Continue Argon 2min, finish this stove smelting molten steel, close continuous caster cast on ladle argon gas, bull ladle, middle bag smelting component: [C] 0.06%, [Si] 0.13%, [Mn] 0.34%, [P] 0.021%, [S] 0.025%.Meet this steel grade chemical composition standard-required.
Use silumin and use the contrast of ferro-aluminum deoxidation efficiency: (identical or close converter smelting endpoint condition is rejected silicomanganese deoxidation impact according to unified calculation)
In the present embodiment, using as calculated the every 10Kg efficiency of silumin deoxidation is 56.6ppm; Add up the identical smelting endpoint condition data same period, using ferro-aluminum to carry out the every 10Kg efficiency of deoxidation is 45 ppm; Use silumin than using many deoxidations of the every 10Kg of ferro-aluminum 11.6ppm.
Meanwhile, in silumin, element silicon is except deoxidation, and partial melting increases molten steel silicone content, improves element silicon specific absorption 0.7%.
embodiment 3: the peritectic steel Q235B that uses silumin to produce.
Silumin, the weight percent of its chemical element moiety is: Si=29%, Al=34%, C=0.11%, P=0.022%, S=0.022%; Be packaged as 10 ± 0.3Kg; Granularity 20-100mm.
(1) converter smelting: steel melting furnace employing capacity is the top and bottom combined blown converter of 80 tons.Smelting number 13Y2-6926, packs 81.3 tons of molten iron, 0.82 ton of steel scrap into, and smelting process adds 2.7 tons of limes, 2.8 tons, ore, 0.8 ton, magnesium ball, and the later stage is measured 76.8 tons of actual taps;
(2) terminal is controlled: a catch carbon terminal of converter [C] 0.08%, [Mn] 0.11%, [P] 0.023%, [S] 0.024%, [Si] are residual vestige, and 1650 ℃ of liquid steel temperatures, meet tapping condition;
(3) deoxidation alloying: connect ladle argon flow amount 120NL/min, start tapping.Tap and start to add silumin 30Kg at 1/3 o'clock, tapping adds silicomanganese 360Kg and ferrosilicon 120Kg to 1/2 o'clock from alloy feed bin;
(4) Argon and adjustment: alloy continues steel ladle bottom argon blowing after adding end; After tapping finishes, drive buggy ladle and to Argon station, continue Argon, adjust argon flow amount to 80 NL/min.Ladle sampling chemical examination after Argon 2min, result is [C] 0.16%, [Si] 0.17%, [Mn] 0.38%, [P] 0.021%, [S] 0.022%.Continue Argon 3min, finish this stove smelting molten steel, close continuous caster cast on ladle argon gas, bull ladle.Middle bag smelting component: [C] 0.18%, [Si] 0.14%, [Mn] 0.36%, [P] 0.024%, [S] 0.022%.Meet this steel grade chemical composition standard-required.
Use silumin and use the contrast of ferro-aluminum deoxidation efficiency: (identical or close converter smelting endpoint condition is rejected silicomanganese deoxidation impact according to unified calculation)
In the present embodiment, using as calculated the every 10Kg efficiency of silumin deoxidation is 44ppm; Add up the identical smelting endpoint condition data same period, using ferro-aluminum to carry out the every 10Kg efficiency of deoxidation is 42.2ppm; Use silumin than using many deoxidations of the every 10Kg of ferro-aluminum 1.8ppm.
Meanwhile, in silumin, element silicon is except deoxidation, and partial melting increases molten steel silicone content, improves element silicon specific absorption 1.2%.
Claims (2)
1. a silumin using method, for converter smelting soft steel, is characterized in that comprising following processing step:
(1) converter smelting: molten iron packs after pretreatment top and bottom combined blown converter oxygen blast into and smelts;
(2) terminal is controlled: the converter terminal sampling of falling stove, and terminal composition and terminal temperature are tapped after meeting processing requirement;
(3) deoxidation alloying: tapping process adds silumin, silicomanganese and ferro-silicon;
(4) Argon and adjustment: the even molten steel composition of Argon station Argon, and adjust molten steel composition and oxygen level until meet smelt steel grade requirement;
Described silumin, the weight percent of its chemical element moiety is: Si=25-30%, Al=30-35%, C≤0.20%, P≤0.03%, S≤0.03%, all the other are iron and being inevitably mingled with, granularity is 20-100mm;
Described deoxidation alloying, tapping process adds silumin, silicomanganese and ferro-silicon, and in tapping, adding silumin, silumin add-on at 1/4 to 1/3 o'clock is 0.3-1.0 Kg/ ton steel; Tap and add successively silicomanganese and ferro-silicon at 1/2 o'clock;
Described Argon and adjustment, tapping process whole process is taked steel ladle bottom argon blowing operation, assurance adds silumin and molten steel fully to melt to react even, use aluminum steel to adjust ladle oxygen level, until meet smelted steel grade oxygen level, switch argon flow amount 80-120 NL/min, soft blow argon 3-5 minute, completes soft steel and smelts.
2. silumin using method according to claim 1, is characterized in that: silicomanganese and ferro-silicon add-on are adjusted according to smelted steel grades, until meet smelt steel grades, requires.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104498670A (en) * | 2014-11-25 | 2015-04-08 | 上海应用技术学院 | Low aluminum compound deoxidizer |
| CN105671412A (en) * | 2016-04-01 | 2016-06-15 | 广东韶钢工程技术有限公司 | Production process for aluminum iron alloy for steelmaking deoxygenation |
| CN107545128A (en) * | 2016-06-23 | 2018-01-05 | 湖南楚钢特种合金科技有限公司 | Machine casting alloy melting dispensing general calculation method |
| CN110295311A (en) * | 2019-07-02 | 2019-10-01 | 北京首钢股份有限公司 | A kind of tune aluminium aluminium alloy and preparation method thereof and adjust aluminium method |
| CN111349755A (en) * | 2020-03-17 | 2020-06-30 | 本钢板材股份有限公司 | Direct supply silicon control process for SAE1006CrQZ steel grade |
| CN112830493A (en) * | 2019-11-23 | 2021-05-25 | 蒋维柒 | Preparation process of siliceous temperature raising agent |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104498670A (en) * | 2014-11-25 | 2015-04-08 | 上海应用技术学院 | Low aluminum compound deoxidizer |
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| CN110295311A (en) * | 2019-07-02 | 2019-10-01 | 北京首钢股份有限公司 | A kind of tune aluminium aluminium alloy and preparation method thereof and adjust aluminium method |
| CN110295311B (en) * | 2019-07-02 | 2021-01-08 | 北京首钢股份有限公司 | Aluminum alloy for aluminum blending, preparation method thereof and aluminum blending method |
| CN112830493A (en) * | 2019-11-23 | 2021-05-25 | 蒋维柒 | Preparation process of siliceous temperature raising agent |
| CN111349755A (en) * | 2020-03-17 | 2020-06-30 | 本钢板材股份有限公司 | Direct supply silicon control process for SAE1006CrQZ steel grade |
| CN111349755B (en) * | 2020-03-17 | 2022-02-08 | 本钢板材股份有限公司 | Direct supply silicon control process for SAE1006CrQZ steel grade |
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Application publication date: 20140319 |