CN102363828A - Method for preventing longitudinal cracks of steel ingots by performing complex deoxidation by adding titanium and calcium into carbon structural steel and alloy structural steel - Google Patents
Method for preventing longitudinal cracks of steel ingots by performing complex deoxidation by adding titanium and calcium into carbon structural steel and alloy structural steel Download PDFInfo
- Publication number
- CN102363828A CN102363828A CN2011103437651A CN201110343765A CN102363828A CN 102363828 A CN102363828 A CN 102363828A CN 2011103437651 A CN2011103437651 A CN 2011103437651A CN 201110343765 A CN201110343765 A CN 201110343765A CN 102363828 A CN102363828 A CN 102363828A
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- China
- Prior art keywords
- steel
- calcium
- deoxidation
- structural steel
- total mass
- 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.)
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Links
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 36
- 239000010959 steel Substances 0.000 title claims abstract description 36
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 title claims abstract description 17
- 239000011575 calcium Substances 0.000 title claims abstract description 17
- 229910052791 calcium Inorganic materials 0.000 title claims abstract description 17
- 238000000034 method Methods 0.000 title claims abstract description 16
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 title claims abstract description 12
- 229910052719 titanium Inorganic materials 0.000 title claims abstract description 12
- 239000010936 titanium Substances 0.000 title claims abstract description 12
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 title abstract description 3
- 229910052799 carbon Inorganic materials 0.000 title abstract description 3
- 229910000746 Structural steel Inorganic materials 0.000 title abstract 4
- 229910045601 alloy Inorganic materials 0.000 title abstract 2
- 239000000956 alloy Substances 0.000 title abstract 2
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 12
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims abstract description 12
- 239000004411 aluminium Substances 0.000 claims description 9
- 229910000851 Alloy steel Inorganic materials 0.000 claims description 4
- 229910000975 Carbon steel Inorganic materials 0.000 claims description 3
- 239000010962 carbon steel Substances 0.000 claims description 3
- 238000003723 Smelting Methods 0.000 abstract description 8
- 238000004519 manufacturing process Methods 0.000 abstract description 3
- 239000013078 crystal Substances 0.000 abstract description 2
- 239000011159 matrix material Substances 0.000 abstract description 2
- 239000012535 impurity Substances 0.000 abstract 3
- 229910052751 metal Inorganic materials 0.000 abstract 1
- 239000002184 metal Substances 0.000 abstract 1
- 238000000137 annealing Methods 0.000 description 4
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 238000006392 deoxygenation reaction Methods 0.000 description 2
- 238000010583 slow cooling Methods 0.000 description 2
- 238000001816 cooling Methods 0.000 description 1
- 235000019628 coolness Nutrition 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Landscapes
- Treatment Of Steel In Its Molten State (AREA)
Abstract
The invention discloses a method for preventing longitudinal cracks of steel ingots by performing complex deoxidation by adding titanium and calcium into carbon structural steel and alloy structural steel. The method is characterized in that aluminum in an amount which is 0.02 to 0.04 percent of the total mass of molten steel, titanium in an amount which is 0.03 to 0.06 percent of the total mass of the molten steel and calcium in an amount which is 0.04 to 0.05 percent of the total mass of the molten steel are added during deoxidation to perform the complex deoxidation. Due to the addition of the calcium during the deoxidation, high-pressure calcium steam is formed; and the calcium steam is combined with multangular impurities and graphitized tissue which are formed during the deoxidation, so that free enthalpy of the multangular impurities such as the aluminum and the graphitized tissue which cause the longitudinal cracks of the steel ingots is reduced and is spherified, and thus, stress concentration of the multangular impurities such as the aluminum and the graphitized tissue on metal matrix crystal boundaries is eliminated, and the problem of the longitudinal cracks of the steel ingots is solved effectively. When the method is used, a smelting process for steel is simplified greatly, the production cost is reduced, and the smelting period is shortened.
Description
Technical field
The present invention relates to the smelting technology of steel, relate in particular to the method for the anti-lobe of steel ingot when deoxidation.
Background technology
The production technique of carbon element and structural alloy steel is through smelting into molten steel at present; Add behind the aluminium of molten steel total mass 0.06～0.08% deoxidation at last or add little amount of titanium again; Be poured into ingot mould, carry out long-time slow cooling after the molten steel solidification demoulding and go out the hole, but often occur that ingot slow cool is improper to be caused the steel ingot lobe and scrap; For this reason, have to adopt water and steel ingot is heat-treated annealing after the ingot demoulding and prevent the steel ingot lobe.Prevent ingot crack with this method, not only consuming time, power consumption, cost improve, and the floor space of workpiece and frock is big, and nonetheless, have slightly not at that time still and the quality problems that the steel ingot lobe is scrapped appear in regular meeting in slow cooling and annealing.Therefore, in smelting process, if can search out and a kind ofly can after watering the ingot demoulding, no longer heat-treat annealing, and can prevent the method for steel ingot lobe effectively, will be a kind of great contribution to whole smelting iron and steel technology then.
Summary of the invention
The purpose of this invention is to provide that a kind of method is simple, effect is obvious, no longer need annealing after the demoulding, make the steel ingot of structural carbon steel and structural alloy steel that the method for lobe can not take place after cast.
In order to reach above-mentioned requirements, the technical characterictic of this method is: when deoxidation, except that the aluminium that adds molten steel total mass 0.02～0.04%, it is characterized in that also adding 0.03～0.06% titanium of molten steel total mass and 0.04～0.05% calcium carries out complex deoxidization.
During according to complex deoxidization that aforesaid method carried out; Owing to when deoxidation, added calcium; Formed and had highly compressed calcium steam; The inclusion of the multi-angular shape that produces and greying tissue bond when calcium steam and deoxidation; Make the inclusion such as aluminium of the multi-angular shape that causes the steel ingot lobe after these and the free enthalpy of greying tissue reduce to form nodularization, inclusion such as aluminium and the greying tissue of having eliminated multi-angular shape be to the stress concentration between the metallic matrix crystal boundary, thereby prevent the problem of steel ingot longitudinal cracking effectively.The smelting technology of steel has been simplified in this invention greatly, has reduced production cost, has shortened smelting cycle.
Practical implementation
Through embodiment the present invention is done further description below.
1590 ℃～1650 ℃ of temperature when final deoxygenation, the aluminium of adding molten steel total mass 0.02～0.04%, 0.03～0.06% titanium and 0.04～0.05% calcium carry out complex deoxidization; Calm 5～7 minutes time before the cast; Pouring speed: 400～500mm/ minute; Demould time: according to ingot shape diameter of section size 0.35～0.9 hour/inch.
Instance 1:
10 inch 45
#22 on steel ingot adopts the titanium 0.045%, the aluminium 0.025% that add the molten steel total mass, and back 3.5 hours demoulding air coolings are poured into a mould in calcium 0.045% deoxidation, do not find any lobe phenomenon.
Instance 2:
5 steel ingots of 20 inches P20 adopt the titanium 0.045%, the aluminium 0.03% that add the molten steel total mass, behind calcium 0.05% final deoxygenation, and the mould demoulding in cold 18 hours, all qualified through check.
Instance 3:
28 inch 55
#3 on steel ingot adopts the titanium 0.04%, aluminium 0.02%, the calcium 0.045% that add the molten steel total mass, and the mould demoulding in cold 24 hours is all qualified through check.
Claims (1)
1. structural carbon steel and structural alloy steel add the method that titanium, calcium complex deoxidization prevent the steel ingot lobe; It is characterized in that: when deoxidation, except that the aluminium that adds molten steel total mass 0.02～0.04%, it is characterized in that also adding 0.03～0.06% titanium of molten steel total mass and 0.04～0.05% calcium carries out complex deoxidization.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110343765.1A CN102363828B (en) | 2011-10-25 | 2011-10-25 | Method for preventing longitudinal cracks of steel ingots by performing complex deoxidation by adding titanium and calcium into carbon structural steel and alloy structural steel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110343765.1A CN102363828B (en) | 2011-10-25 | 2011-10-25 | Method for preventing longitudinal cracks of steel ingots by performing complex deoxidation by adding titanium and calcium into carbon structural steel and alloy structural steel |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102363828A true CN102363828A (en) | 2012-02-29 |
| CN102363828B CN102363828B (en) | 2014-01-15 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201110343765.1A Active CN102363828B (en) | 2011-10-25 | 2011-10-25 | Method for preventing longitudinal cracks of steel ingots by performing complex deoxidation by adding titanium and calcium into carbon structural steel and alloy structural steel |
Country Status (1)
| Country | Link |
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| CN (1) | CN102363828B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103374643A (en) * | 2012-04-29 | 2013-10-30 | 浙江大江合金钢钢管有限公司 | Anti-longitudinal division final deoxidation method for medium-carbon and alloy structured steel ingots |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1664125A (en) * | 2005-03-28 | 2005-09-07 | 浙江大隆合金钢有限公司 | Prevention of split crack of carbon in intermediate carbon and alloy structural steel ingot by adding titanium and process for producing same |
| CN101045948A (en) * | 2007-04-29 | 2007-10-03 | 攀钢集团攀枝花钢铁研究院 | Method for producing boron steel by smelting in converter |
| CN101086028A (en) * | 2007-07-13 | 2007-12-12 | 谢应凯 | Composite deoxidizing agent aluminum-calcium-iron alloy for smelting steel |
| CN101787489A (en) * | 2010-03-11 | 2010-07-28 | 燕山大学 | Easy-welding low-carbon bainitic steel and manufacturing method thereof |
-
2011
- 2011-10-25 CN CN201110343765.1A patent/CN102363828B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1664125A (en) * | 2005-03-28 | 2005-09-07 | 浙江大隆合金钢有限公司 | Prevention of split crack of carbon in intermediate carbon and alloy structural steel ingot by adding titanium and process for producing same |
| CN101045948A (en) * | 2007-04-29 | 2007-10-03 | 攀钢集团攀枝花钢铁研究院 | Method for producing boron steel by smelting in converter |
| CN101086028A (en) * | 2007-07-13 | 2007-12-12 | 谢应凯 | Composite deoxidizing agent aluminum-calcium-iron alloy for smelting steel |
| CN101787489A (en) * | 2010-03-11 | 2010-07-28 | 燕山大学 | Easy-welding low-carbon bainitic steel and manufacturing method thereof |
Non-Patent Citations (1)
| Title |
|---|
| 栾兆亮等: "转炉优质碳素和合金结构钢质量缺陷表现形式及分析与控制", 《第十届中国科协年会论文集》 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103374643A (en) * | 2012-04-29 | 2013-10-30 | 浙江大江合金钢钢管有限公司 | Anti-longitudinal division final deoxidation method for medium-carbon and alloy structured steel ingots |
Also Published As
| Publication number | Publication date |
|---|---|
| CN102363828B (en) | 2014-01-15 |
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| C14 | Grant of patent or utility model | ||
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| CP03 | Change of name, title or address |
Address after: 314101 No. 153, FenHu South Road, Taozhuang Town, Jiashan County, Jiaxing City, Zhejiang Province Patentee after: Zhejiang Dalong New Materials Co.,Ltd. Country or region after: China Address before: 314101 Zhejiang County of Jiashan province Tao Fen Hu Town Industrial Park Zhejiang Dalong Alloy Steel Co Ltd Patentee before: ZHEJIANG DALONG ALLOY STEEL Co.,Ltd. Country or region before: China |
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