CN102747269A - Low-silicon aluminum-containing steel and production method thereof - Google Patents
Low-silicon aluminum-containing steel and production method thereof Download PDFInfo
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Abstract
The invention relates to a production method of low-silicon aluminum-containing steel. The method is characterized in that: in converter terminal-point molten steel, the content of C is no lower than 0.05at%, the content of P is no lower than 0.020at%, and a tapping temperature is 1630-1670 DEG C. High-carbon ferromanganese and aluminum-manganese-titanium deoxidizing agents are added, and a refining target is that [Al]=0.060-0.080at%. In the LF refining furnace, component fine tuning is carried out, wherein addition amounts of medium-carbon ferromanganese and aluminum wires are determined according to alloy elements of the converter molten steel. Wire feeding treatment is carried out by using Ca-Fe wires, wherein a requirement on molten steel before calcium treatment is that [Al]=0.045-0.060at%. The Ca-Fe wires are vertically fed, wherein a feeding speed is no lower than 2.1m/s, and a [Ca]/[Al] mass ratio is 0.08-0.12. During continuous casting production, a superheat degree is controlled at 25-35 DEG C, and a casting speed is controlled within a range of 2.2-2.6m/min. When casting is started, 10 Ca-Fe wires are added in a middle-ladle T-port. When a large ladle begins casting, 3-5 Ca-Fe wires are added into the middle-ladle at the 1 and 6 flow stoppers. The method provided by the invention is advantaged in that: under a premise that a technical route is not changed, outlet flocculation blocking during continuous casting of the steel is avoided with a specific technology, and a control target of low silicon content is satisfied.
Description
Technical field
The present invention relates to the working method that a kind of low silicon contains aluminum steel, belong to metallurgy and metal material field.
Background technology
SWRCH22A belongs to low silicon and contains the aluminium cold heading steel, and the wire rod of this steel grade production is the raw material commonly used that the fastening piece production is used for producing screw, nut, and its chemical ingredients is seen table 1.
Table 1 chemical ingredients (mass percent)
When most domestic steel mill produces SWRCH22A at present; All adopt converter smelting-LF ladle furnace refining-continuous small-billet casting operational path; But often nozzle clogging takes place and the stagnant water mouth of wadding a quilt with cotton during continuous casting; Cause and can't the company of realization water production, had a strong impact on the smooth production of this steel grade, part steel mill receives it to influence the production of having abandoned this steel grade.
Tracing it to its cause is to contain the aluminium cold heading steel because SWRCH22A belongs to low silicon, and this steel grade requires Al in the steel
Entirely>=0.025% (mass percent), because the Al reductibility is very strong, so it is in a large number with Al
2O
3Form is present in the steel, numerous Al
2O
3Existence caused billet caster to connect the wadding plug at the mouth of a river when watering.Therefore how both to have guaranteed Al in the steel
Entirely>=0.025% (mass percent), mouth of a river wadding is dead when avoiding billet caster even to water again, and what the company of assurance watered is that difficult point belongs to smoothly, and its silicone content is low simultaneously also is a difficult point of producing.
Summary of the invention
The purpose of this invention is to provide a kind ofly under the prerequisite that does not change operational path, can avoid the low silicon of SWRCH22A to contain the aluminum steel steel grade and connect that the wadding at the mouth of a river when watering is dead to contain the working method of aluminum steel with the low silicon that satisfies the controlled target of low silicon content.
Concrete solution of the present invention is following:
1, converter production
The carbon content of converter terminal molten steel, phosphorus content and tapping temperature are following: carbon content C>=0.05at%, P≤0.020at%, tapping temperature 1630-1670 ℃;
Avoid the use of high-carbon, the used ladle of high silicon steel, ladle must not have residue, residual steel, guarantees the clean degree of ladle.Require to add high carbon ferromanganese and aluminium base multi-functional composite deoxidant deoxidation alloying, aluminium base multi-functional composite deoxidant add-on 4.0～5.5kg/t, target refining [Al]=0.060～0.080at% in place according to the SWRCH22A composition.Tapping 3/4～4/5 adds floating plug and carries out pushing off the slag, requires that slag thickness is not more than 55mm under the converter.Tapping process adds slag supplying agent (lime+fluorite) 200kg/ stove after adding reductor immediately, and the tapping process ladle will carry out the BOTTOM ARGON BLOWING operation, adopts atm number to stir during Argon.
2, the LF stove is produced
Add lime, fluorite and bauxitic clay according to the converter molten steel composition, the calcium carbide add-on is controlled at 50-100kg.Confirm that according to the converter molten steel alloying element content add-on of mid-carbon fe-mn, aluminum steel carries out trimming.For preventing to increase silicon, carry out not using the Si-Ca-Fe alloy when Ca handles at molten steel, handle and adopt the Ca-Fe line to feed silk.Molten steel required before calcium was handled: [Al]=0.045-0.060at%.Ca-Fe line feeding speed >=2.1m/s requires vertically feeding.Ca-Fe line feed quantity 450-600m, the average yield of Ca is 10.01%.Make HMP Al2O3 be converted into low-melting calcium aluminate, watering property of improvement prevents nozzle clogging effectively.But the erosion that [Ca] increases the mouth of a river, stopper also increases, and influenced the life-span of the mouth of a river, stopper, so the feed quantity of Ca-Fe line will be considered terminal point [Al] content.Grope through production practice, [Ca]/[Al] mass ratio is controlled at 0.08-0.12.
3, continuous casting production
Superheating temperature is controlled at 30 ± 5 ℃, and pulling rate is controlled in the 2.2-2.6m/min scope.
Open when watering, in the process of calling a taxi, in tundish T type mouth, add 10 calcium iron wires; Unwrap greatly water after, in tundish, respectively add 3 to 5 calcium iron wires at the 1st, 6 stream stopper places.
Advantage of the present invention is: under the prerequisite that does not change operational path, adopt specific process means avoided this steel grade connect the wadding at the mouth of a river when watering dead with the controlled target that satisfies low silicon content.
Embodiment
The commerical test production technique is summarized as follows:
Converter smelting-LF ladle furnace refining-continuous small-billet casting
THE INDUSTRIAL TRIAL 15 stove steel, the control of concrete processing parameter as follows:
1) converter production
Add lime 3500-5000kg according to practical situation during converter smelting, rhombspar 900-1000kg, fluorite 200-450kg adds high carbon ferromanganese 1000kg, aluminium manganese titanium 400-550kg in the tapping process.
The carbon content of converter terminal molten steel, phosphorus content (mass percent) and tapping temperature are as shown in table 2.
The composition of table 2 converter tapping and temperature
2) the LF stove is produced
The refining of LF stove adds the auxiliary material slag making according to molten steel composition and temperature variation, adds that alloy is finely tuned and warming temperature.Add lime 400-500kg, fluorite 200kg, bauxitic clay 150-200kg, calcium carbide 50kg, alloy is finely tuned ferromanganese 50-100kg according to refining composition in place, adds aluminum steel 200m, feeding Ca-Fe line feed quantity 450-600m after the refining.
Table 3 refining station chemical composition change and Al, Ca content (at%)
3) continuous casting production
Superheating temperature is controlled at 26-33 ℃, and pulling rate is between 2.2-2.6m/min.Open when watering, in the process of calling a taxi, in tundish T type mouth, add 10 calcium iron wires; Unwrap greatly water after, in tundish, respectively add 3 to 5 calcium iron wires at the 1st, 6 stream stopper places;
The composition of molten steel (mass percent) control is as shown in table 4.
Table 4 finished product composition (at%)
Test-results shows through the control to production links such as converter, LF refining, continuous castings, does not occur even watering wadding dead phenomenon in the mouth of a river during production.
Claims (2)
1. a low silicon contains the working method of aluminum steel, and it is characterized in that: the carbon content of converter terminal molten steel, phosphorus content and tapping temperature are following: carbon content C>=0.05at%, P≤0.020at%, tapping temperature 1630-1670 ℃; Require to add high carbon ferromanganese and aluminium base multi-functional composite deoxidant deoxidation alloying, aluminium base multi-functional composite deoxidant add-on 4.0～5.5kg/t, target refining [Al]=0.060～0.080at% in place according to the SWRCH22A composition; The LF refining furnace confirms that according to the converter molten steel alloying element content add-on of mid-carbon fe-mn, aluminum steel carries out trimming; Adopt the Ca-Fe line to feed silk and handle, molten steel required before calcium was handled: [Al]=0.045-0.060at%.Ca-Fe line feeding speed >=2.1m/s requires vertically feeding, Ca-Fe line feed quantity 450-600m, and [Ca]/[Al] mass ratio is controlled at 0.08-0.12; Superheating temperature was controlled at 30 ± 5 ℃ when continuous casting was produced, and pulling rate is controlled in the 2.2-2.6m/min scope; Open when watering, in the process of calling a taxi, in tundish T type mouth, add 10 calcium iron wires; Unwrap greatly water after, in tundish, respectively add 3 to 5 calcium iron wires at the 1st, 6 stream stopper places.
2. low silicon according to claim 1 contains the working method of aluminum steel, it is characterized in that: aluminium base multi-functional composite deoxidant is an aluminium manganese titanium reductor.
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Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103820601A (en) * | 2014-02-17 | 2014-05-28 | 河北钢铁股份有限公司邯郸分公司 | Method for improving casting success rate of low-carbon low-silicon aluminum killed steel |
| CN105478502A (en) * | 2015-12-29 | 2016-04-13 | 东莞市科力钢铁线材有限公司 | Production process of non-annealed wire material for pulling rivet pull rod |
| CN105543665A (en) * | 2015-12-29 | 2016-05-04 | 东莞市科力钢铁线材有限公司 | Production technology of anti-extrusion cold-heading steel material for pointed-tail products |
| CN106957942A (en) * | 2017-03-06 | 2017-07-18 | 河钢股份有限公司邯郸分公司 | A kind of low carbon low silicon aluminium killed steel that improves directly starts to walk to open the method for pouring success rate |
| CN107447070A (en) * | 2017-07-30 | 2017-12-08 | 湖南华菱湘潭钢铁有限公司 | A kind of Aluminum steel converter smelting method |
| CN107447157A (en) * | 2017-08-02 | 2017-12-08 | 首钢水城钢铁（集团）有限责任公司 | A kind of cold-forging steel and its manufacturing process |
| CN107475484A (en) * | 2017-07-28 | 2017-12-15 | 江苏省沙钢钢铁研究院有限公司 | Al reduction during aluminum casting killed cold heading steel2O3Erosion method of-C stopper rod |
| CN108220796A (en) * | 2017-12-28 | 2018-06-29 | 东莞科力线材技术有限公司 | A kind of sports equipment connecting shaft wire rod and preparation method thereof |
| CN109943683A (en) * | 2019-03-06 | 2019-06-28 | 鞍钢股份有限公司 | Refining and continuous casting method for producing alloy cold forging steel by using small square billets |
| CN111254340A (en) * | 2020-01-21 | 2020-06-09 | 鞍钢股份有限公司 | Smelting method of ultra-low silicon high titanium aluminum-containing welding wire steel |
| CN112899553A (en) * | 2021-01-21 | 2021-06-04 | 包头钢铁（集团）有限责任公司 | Production method for reducing corner cracks of low-silicon aluminum-containing steel billet |
| CN113817893A (en) * | 2021-09-22 | 2021-12-21 | 中天钢铁集团有限公司 | Continuous casting production method of low-silicon high-aluminum sulfur-containing steel |
| CN114085953A (en) * | 2021-11-11 | 2022-02-25 | 阳春新钢铁有限责任公司 | Control method for acid dissolution of aluminum in aluminum-containing cold heading steel |
| CN115961204A (en) * | 2023-01-12 | 2023-04-14 | 包头钢铁（集团）有限责任公司 | Production method of steel for 8.8-grade bolt |
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| CN102296230A (en) * | 2011-09-07 | 2011-12-28 | 柳州钢铁股份有限公司 | Hot rolled steel for vehicle wheel steel ring, and production process thereof |
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| CN101439392A (en) * | 2007-11-21 | 2009-05-27 | 首钢总公司 | Method for producing steel for self-tapping screw for continuous casting production of billet |
| JP2009248089A (en) * | 2008-04-01 | 2009-10-29 | Kobe Steel Ltd | Continuous casting method for extralow carbon steel or low carbon steel using grooved immersion nozzle |
| CN102021273A (en) * | 2010-12-30 | 2011-04-20 | 安阳钢铁股份有限公司 | Fluidness control method of molten low-silicon aluminized steel of square billet |
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Cited By (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103820601A (en) * | 2014-02-17 | 2014-05-28 | 河北钢铁股份有限公司邯郸分公司 | Method for improving casting success rate of low-carbon low-silicon aluminum killed steel |
| CN105478502A (en) * | 2015-12-29 | 2016-04-13 | 东莞市科力钢铁线材有限公司 | Production process of non-annealed wire material for pulling rivet pull rod |
| CN105543665A (en) * | 2015-12-29 | 2016-05-04 | 东莞市科力钢铁线材有限公司 | Production technology of anti-extrusion cold-heading steel material for pointed-tail products |
| CN106957942A (en) * | 2017-03-06 | 2017-07-18 | 河钢股份有限公司邯郸分公司 | A kind of low carbon low silicon aluminium killed steel that improves directly starts to walk to open the method for pouring success rate |
| CN107475484A (en) * | 2017-07-28 | 2017-12-15 | 江苏省沙钢钢铁研究院有限公司 | Al reduction during aluminum casting killed cold heading steel2O3Erosion method of-C stopper rod |
| CN107447070A (en) * | 2017-07-30 | 2017-12-08 | 湖南华菱湘潭钢铁有限公司 | A kind of Aluminum steel converter smelting method |
| CN107447157A (en) * | 2017-08-02 | 2017-12-08 | 首钢水城钢铁（集团）有限责任公司 | A kind of cold-forging steel and its manufacturing process |
| CN108220796A (en) * | 2017-12-28 | 2018-06-29 | 东莞科力线材技术有限公司 | A kind of sports equipment connecting shaft wire rod and preparation method thereof |
| CN109943683A (en) * | 2019-03-06 | 2019-06-28 | 鞍钢股份有限公司 | Refining and continuous casting method for producing alloy cold forging steel by using small square billets |
| CN111254340A (en) * | 2020-01-21 | 2020-06-09 | 鞍钢股份有限公司 | Smelting method of ultra-low silicon high titanium aluminum-containing welding wire steel |
| CN112899553A (en) * | 2021-01-21 | 2021-06-04 | 包头钢铁（集团）有限责任公司 | Production method for reducing corner cracks of low-silicon aluminum-containing steel billet |
| CN113817893A (en) * | 2021-09-22 | 2021-12-21 | 中天钢铁集团有限公司 | Continuous casting production method of low-silicon high-aluminum sulfur-containing steel |
| CN113817893B (en) * | 2021-09-22 | 2022-06-28 | 中天钢铁集团有限公司 | Continuous casting production method of low-silicon high-aluminum sulfur-containing steel |
| CN114085953A (en) * | 2021-11-11 | 2022-02-25 | 阳春新钢铁有限责任公司 | Control method for acid dissolution of aluminum in aluminum-containing cold heading steel |
| CN114085953B (en) * | 2021-11-11 | 2023-01-13 | 阳春新钢铁有限责任公司 | Control method for acid dissolution of aluminum in aluminum-containing cold heading steel |
| CN115961204A (en) * | 2023-01-12 | 2023-04-14 | 包头钢铁（集团）有限责任公司 | Production method of steel for 8.8-grade bolt |
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Application publication date: 20121024 |