CN102399929A - Method for reducing cracks on surface of aluminum-deoxidized high-carbon steel casting blank - Google Patents
Method for reducing cracks on surface of aluminum-deoxidized high-carbon steel casting blank Download PDFInfo
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- CN102399929A CN102399929A CN2010102751469A CN201010275146A CN102399929A CN 102399929 A CN102399929 A CN 102399929A CN 2010102751469 A CN2010102751469 A CN 2010102751469A CN 201010275146 A CN201010275146 A CN 201010275146A CN 102399929 A CN102399929 A CN 102399929A
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Abstract
The invention relates to a method for reducing cracks on the surface of an aluminum-deoxidized high-carbon steel casting blank. The method is characterized in that: AlS and N in molten steel are respectively controlled in operations of converter melting, steel tapping deoxidization, slagging, refinement, and continuous casting to inhibit the generation of AlN, so the cracks on the surface of the high-carbon steel casting blank are reduced. The method comprises the following steps: 1, reducing the content of N in molten steel; 2, deoxidizing; 3, keeping the CaO/SiO2 ratio in top slag at 1.5-2.5; 4, keeping the alkalinity CaO/SiO2 ratio in top slag of the refining terminal at 2.0-5.0; and 5, keeping the AlS/N ratio before rolling at 2.32-6.68. Compared with the prior art, the method of the invention has the following beneficial effects: AlS and N in molten steel are controlled to inhibit the generation of AlN, so the cracks on the surface of the high-carbon steel casting blank is effectively reduced, the total oxygen content and the crystal grain refinement effect of the high-carbon steel are reduced through the aluminum deoxidization, and the cracks on the high-carbon steel casting blank, which are caused by the aluminum addition, are reduced.
Description
Technical field
The present invention relates to the process for making technical field, relate in particular to a kind of method that reduces aluminium deoxidation high carbon steel slab surface crack.
Background technology
The high carbon steel and the high-carbon alloy steel of carbon content 0.60～1.00% generally all adopt al-free deoxidation at present; But also adopt aluminium deoxidation sometimes for reducing interior total oxygen content of molten steel and crystal grain thinning, high carbon steel is after carrying out aluminium deoxidation, and casting billet surface is prone to crackle; Its reason is: high carbon steel is owing to need to add a large amount of carburelants; Carburelant itself all can increase nitrogen in steel content with the carburelant adition process, so the nitrogen content of high carbon steel surpasses 40 * 10 generally all than higher
-6, nitrogen content can further increase after adopting aluminium deoxidation, can form AlN simultaneously, in the casting blank solidification process, separates out the formation crackle from crystal boundary.
Summary of the invention
The purpose of this invention is to provide a kind of method that reduces aluminium deoxidation high carbon steel slab surface crack, promptly keep the advantage of high carbon steel aluminium deoxidation, can effectively reduce the high carbon steel slab surface crack again.
For realizing above-mentioned purpose, the present invention realizes through following technical scheme:
A kind of method that reduces aluminium deoxidation high carbon steel slab surface crack; In converter melting, tapping deoxidization, slag making, refining, each operation of continuous casting respectively to molten steel in Als and N control; Suppress the generation of AlN, thereby reduce the surface crack of high carbon steel strand, its operation steps is following:
1) converter tapping carbon is controlled at 0.40～0.60%, and the once tapping of falling the stove is adopted in converter; If secondary falls stove and falls stove for the first time and need require to add the high specific gravity carburelant by finished product carbon content target behind the stove at carbon content of molten steel more than 1.0%, reduce the N content in the molten steel, the N content after the converter in the molten steel is controlled at 20 * 10
-6～30 * 10
-6%;
2) in tapping process, adopt aluminium matter reductor to carry out deoxidation, aluminium matter reductor add-on is by 0.25～0.45kg/t steel, and sampling Als content is controlled at 0.030～0.080% behind the molten steel stove;
3) add quickened lime behind the converter stove, add-on guarantees refining furnace molten steel top basicity of slag in early stage, CaO/SiO in the slag of top by 1.2～3.5kg/t steel
2Value is controlled at 1.5～2.5;
4) molten steel no longer adds any aluminium matter reductor after arriving refining, and liquid steel refining terminal point Als content is controlled at 0.005～0.025%, refining terminal point top basicity of slag CaO/SiO
2Value is controlled at 2.0～5.0;
5) the secondary cooling water specific water is controlled to be 0.15～0.35l/kg during continuous casting, reduces the responsive intensity of strand crackle;
6) when Als/N in the strand is 2.32～6.68 directly the dress process furnace be rolled, otherwise be rolled refilling process furnace behind strand slow cooling to 30 at room temperature～400 ℃.
Compared with prior art; The invention has the beneficial effects as follows: 1) through Als in the molten steel and N are controlled; Suppress the generation of AlN; Thereby effectively reduce the surface crack of high carbon steel strand, realized promptly reducing the effect of high carbon steel total oxygen content and crystal grain thinning, reduced again because the adding of aluminium causes the high carbon steel slab surface crack through aluminium deoxidation; 2) postorder that has reduced strand is cleared up and reconditioning, has reduced labour intensity, has improved production efficiency.
Embodiment
Following specific embodiments of the invention is described further:
A kind of method that reduces aluminium deoxidation high carbon steel slab surface crack of the present invention; In converter melting, tapping deoxidization, slag making, refining, each operation of continuous casting respectively to molten steel in Als and N control; Suppress the generation of AlN, thereby reduce the surface crack of high carbon steel strand, its operation steps is following:
1) converter tapping carbon is controlled at 0.40～0.60%, and the once tapping of falling the stove is adopted in converter; If secondary falls stove and falls stove for the first time and need require to add the high specific gravity carburelant by finished product carbon content target behind the stove at carbon content of molten steel more than 1.0%, reduce the N content in the molten steel, the N content after the converter in the molten steel is controlled at 20 * 10
-6～30 * 10
-6%;
2) in tapping process, adopt aluminium matter reductor to carry out deoxidation, aluminium matter reductor add-on is by 0.25～0.45kg/t steel, and sampling Als content is controlled at 0.030～0.080% behind the molten steel stove; Guarantee the disposable deoxidation of converter, prevent that the refining secondary from adding aluminium matter reductor, control refining nitrogen increased amount; Said aluminium matter deoxidant ingredient % by weight does; Al:45～55%, CaO:15～25%, SiO
2: 8～12%, MgO:8～10%, H
2O＜1.0%, other is a unavoidable impurities, the weight summation is 100%;
3) add quickened lime behind the converter stove, add-on guarantees refining furnace molten steel top basicity of slag in early stage, CaO/SiO in the slag of top by 1.2～3.5kg/t steel
2Value is controlled at 1.5～2.5, quickened lime effective constituent CaO＞90%;
4) molten steel no longer adds any aluminium matter reductor after arriving refining, and liquid steel refining terminal point Als content is controlled at 0.005～0.025%, refining terminal point top basicity of slag CaO/SiO
2Value is controlled at 2.0～5.0;
5) the secondary cooling water specific water is controlled to be 0.15～0.35l/kg during continuous casting, and cold control reduces the responsive intensity of strand crackle a little less than the employing;
6) when Als/N in the strand is 2.32～6.68 directly the dress process furnace be rolled, otherwise be rolled refilling process furnace behind strand slow cooling to 30 at room temperature～400 ℃, be beneficial to crystal grain thinning.
Claims (1)
1. method that reduces aluminium deoxidation high carbon steel slab surface crack; It is characterized in that; In converter melting, tapping deoxidization, slag making, refining, each operation of continuous casting respectively to molten steel in Als and N control; Suppress the generation of AlN, thereby reduce the surface crack of high carbon steel strand, its operation steps is following:
1) converter tapping carbon is controlled at 0.40～0.60%, and the once tapping of falling the stove is adopted in converter; If secondary falls stove and falls stove for the first time and need require to add the high specific gravity carburelant by finished product carbon content target behind the stove at carbon content of molten steel more than 1.0%, reduce the N content in the molten steel, the N content after the converter in the molten steel is controlled at 20 * 10
-6～30 * 10
-6%;
2) in tapping process, adopt aluminium matter reductor to carry out deoxidation, aluminium matter reductor add-on is by 0.25～0.45kg/t steel, and sampling Als content is controlled at 0.030～0.080% behind the molten steel stove;
3) add quickened lime behind the converter stove, add-on guarantees refining furnace molten steel top basicity of slag in early stage, CaO/SiO in the slag of top by 1.2～3.5kg/t steel
2Value is controlled at 1.5～2.5;
4) molten steel no longer adds any aluminium matter reductor after arriving refining, and liquid steel refining terminal point Als content is controlled at 0.005～0.025%, refining terminal point top basicity of slag CaO/SiO
2Value is controlled at 2.0～5.0;
5) the secondary cooling water specific water is controlled to be 0.15～0.35l/kg during continuous casting, reduces the responsive intensity of strand crackle;
6) when Als/N in the strand is 2.32～6.68 directly the dress process furnace be rolled, otherwise be rolled refilling process furnace behind strand slow cooling to 30 at room temperature～400 ℃.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010275146 CN102399929B (en) | 2010-09-08 | 2010-09-08 | Method for reducing cracks on surface of aluminum-deoxidized high-carbon steel casting blank |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010275146 CN102399929B (en) | 2010-09-08 | 2010-09-08 | Method for reducing cracks on surface of aluminum-deoxidized high-carbon steel casting blank |
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| CN102399929A true CN102399929A (en) | 2012-04-04 |
| CN102399929B CN102399929B (en) | 2013-07-31 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106541099A (en) * | 2016-11-26 | 2017-03-29 | 湖南华菱湘潭钢铁有限公司 | It is a kind of to avoid the red method for sending straight dress crackle of surface of steel plate |
| CN107790654A (en) * | 2016-09-06 | 2018-03-13 | 鞍钢股份有限公司 | A kind of control method of low-carbon Al killed cold heading steel continuous casting square billet pattern cracking |
Citations (4)
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|---|---|---|---|---|
| CN1974062A (en) * | 2006-12-22 | 2007-06-06 | 重庆大学 | Crystallizer protecting cinder for continuous casting of crack sensitive steel and its prepn process |
| CN101053893A (en) * | 2006-04-14 | 2007-10-17 | 马鞍山钢铁股份有限公司 | Protective cinder for special-shaped blank continuous casting |
| CN101648263A (en) * | 2009-09-15 | 2010-02-17 | 邢台钢铁有限责任公司 | Bloom continuous casting dynamic soft reduction process for high-quality tire cord steel |
| CN101683685A (en) * | 2008-09-28 | 2010-03-31 | 鞍钢股份有限公司 | Production technology of microalloying wide and thick continous casting slab |
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2010
- 2010-09-08 CN CN 201010275146 patent/CN102399929B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101053893A (en) * | 2006-04-14 | 2007-10-17 | 马鞍山钢铁股份有限公司 | Protective cinder for special-shaped blank continuous casting |
| CN1974062A (en) * | 2006-12-22 | 2007-06-06 | 重庆大学 | Crystallizer protecting cinder for continuous casting of crack sensitive steel and its prepn process |
| CN101683685A (en) * | 2008-09-28 | 2010-03-31 | 鞍钢股份有限公司 | Production technology of microalloying wide and thick continous casting slab |
| CN101648263A (en) * | 2009-09-15 | 2010-02-17 | 邢台钢铁有限责任公司 | Bloom continuous casting dynamic soft reduction process for high-quality tire cord steel |
Non-Patent Citations (1)
| Title |
|---|
| 魏军等: "炼钢-精炼-连铸工艺生产高碳钢的质量控制", 《炼钢》 * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107790654A (en) * | 2016-09-06 | 2018-03-13 | 鞍钢股份有限公司 | A kind of control method of low-carbon Al killed cold heading steel continuous casting square billet pattern cracking |
| CN107790654B (en) * | 2016-09-06 | 2019-08-06 | 鞍钢股份有限公司 | A kind of control method of low-carbon Al killed cold heading steel continuous casting square billet pattern cracking |
| CN106541099A (en) * | 2016-11-26 | 2017-03-29 | 湖南华菱湘潭钢铁有限公司 | It is a kind of to avoid the red method for sending straight dress crackle of surface of steel plate |
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| CN102399929B (en) | 2013-07-31 |
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Inventor after: Cang Shaoshuang Inventor after: Zhang Yong Inventor after: Chang Hongwei Inventor after: Wang Ning Inventor after: Yang Hui Inventor after: Bai Hai Inventor before: Cang Shaoshuang Inventor before: Wang Ning Inventor before: Yang Hui Inventor before: Chang Hongwei Inventor before: Bai Hai |
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