CN100457949C - Method of controlling carbon content in ultralow carbon high strength high toughness steel - Google Patents
Method of controlling carbon content in ultralow carbon high strength high toughness steel Download PDFInfo
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- CN100457949C CN100457949C CNB2007100487277A CN200710048727A CN100457949C CN 100457949 C CN100457949 C CN 100457949C CN B2007100487277 A CNB2007100487277 A CN B2007100487277A CN 200710048727 A CN200710048727 A CN 200710048727A CN 100457949 C CN100457949 C CN 100457949C
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Abstract
The present invention provides method of controlling carbon content in ultralow carbon high strength and high toughness steel. The method includes the following steps: 1. adopting semi-killed steel with molten steel oxygen activity before vacuum treatment of 0.0080- 0.0150 % and carbon content below 0.10 %, or alloying medium carbon ferromanganese with oxygen content before vacuum treatment over 1.30 %; and 2. vacuum treatment at vacuum degree below 300 Pa to decarbonize through carbon-oxygen reaction. The technological process of the present invention is simple, low in cost and easy in operation, and may control the carbon content in steel product in 0.02-0.06 %.
Description
Technical field
The present invention relates to metallurgical technology field, particularly relate to a kind of control method of carbon content in ultralow carbon high strength high toughness steel.
Background technology
High-strength and high-toughness steel has characteristics such as the obdurability coupling is splendid, welding property is good, use extremely extensive, this class steel typical case representative has ultra-low-carbon bainite steel and acicular ferrite steel, its chemical composition design characteristics are that carbon drop increases manganese, and add Nb, B, Cu, Mo, Cr, Ni, microalloy elements such as V, Ti, carbon content generally is not more than 0.08% in the steel, but because Ultra-low carbon high-strength and high-toughness steel alloying element kind is many and content is high, produce [C]≤0.08%th, be difficult to realize by traditional revolving furnace continuous casting smelting technology.
Along with the development and the large-scale application of ladle metallurgy technology, make the scale operation of Ultra-low carbon high-strength and high-toughness steel become possibility, the degree of cleaning of steel improve greatly simultaneously, have improved the over-all properties of steel.Adopt converter → vacuum → continuous casting process route as Japan and Wuhan Iron and Steel Plant, Wuhan Iron and Steel Plant also adopts electric furnace → vacuum → electrically heated → continuous casting process route, and visible vacuum-treat is a committed step of smelting this class steel.
Utilize vacuum decarburization to mainly contain two kinds of methods at present, a kind of is the decarburization (pre-deoxidation steel) of vacuum nature; Another kind is vacuum-oxygen decarbonizing (killed steel).First method adopts carbon content in nature decarburization and the carburetion method control steel, and its key is carbon content and an oxygen activity before control is handled, but exist the vacuum alloy addition big, require the problem that the alloy carbon content is low, cost is high; Second method adopts carbon content in the oxygen decarburization method control steel, and its key is a control oxygen blast system, but problem such as splash and alloy oxidation when having oxygen blast.
Summary of the invention
Technical problem to be solved by this invention provides a kind of control method of carbon content in ultralow carbon high strength high toughness steel, and this method technology is simple, be 0.02～0.06% without the carbon content of oxygen blast, high-strength and high-toughness steel.
The technical scheme that technical solution problem of the present invention is adopted is: the control method of carbon content in ultralow carbon high strength high toughness steel, this method may further comprise the steps: 1) adopt semikilled steel, the molten steel oxygen activity remains on 0.0080～0.0150% before the vacuum-treat, carbon content remains on below 0.10%; Adopt the mid-carbon fe-mn alloying, manganese content is more than 1.30% before the vacuum-treat; 2) during vacuum-treat, vacuum tightness remains on below the 300Pa, utilizes the reaction between carbon and oxygen decarburization.
The invention has the beneficial effects as follows: adopt the carbon content of method of the present invention control high-strength and high-toughness steel, technology is simple, cost is low, easy to operate, carbon content is easy to control, the Finished Steel carbon content is 0.02～0.06%.
Embodiment
The present invention adopts semikilled steel, by carbon content, oxygen activity, manganese content and the vacuum technology before the control vacuum-treat, reaches the purpose of control carbon content.Smelting process roughly step is: hot metal pretreatment → converter → electrically heated → vacuum → continuous casting.
Concrete control method of the present invention is: oxygen activity remains on 0.0080～0.0150% before the vacuum-treat; Adopt the mid-carbon fe-mn alloying, the preceding manganese content of vacuum-treat is remained on more than 1.30%, but be no more than the desired manganese content of Finished Steel; Carbon content remains on below 0.10% before the vacuum-treat; During vacuum-treat, reduce vacuum chamber pressure, vacuum tightness is remained on below the 300Pa, utilize the reaction between carbon and oxygen decarburization, need not add aluminium oxygen blast heating; During vacuum-treat, vacuum tubular stinger depth of penetration preferably remains on more than the 650mm; The omnidistance lift gas flow of vacuum preferably remains on 1000～1200NL/min, and the vacuum decarburization time is preferably 5min.
Table 1 is 16 embodiment of the present invention, and table 2 is carbon contents of 16 resulting Finished Steels of embodiment of table 1, and as can be seen, the Finished Steel carbon content is 0.02～0.06%.
| 8 | 0.04 | 1.31 | 0.0133 | 650 | 1200 | 5 | 70 | 0.02 |
| 9 | 0.06 | 1.43 | 0.0099 | 650 | 1200 | 5 | 160 | 0.04 |
| 10 | 0.07 | 1.42 | 0.0133 | 660 | 1200 | 5 | 70 | 0.03 |
| 11 | 0.07 | 1.30 | 0.0125 | 650 | 1200 | 5 | 130 | 0.04 |
| 12 | 0.08 | 1.33 | 0.0119 | 660 | 1200 | 5 | 130 | 0.05 |
| 13 | 0.06 | 1.35 | 0.0130 | 650 | 1200 | 5 | 30 | 0.03 |
| 14 | 0.05 | 1.37 | 0.0130 | 650 | 1200 | 5 | 140 | 0.02 |
| 15 | 0.08 | 1.40 | 0.0096 | 650 | 1200 | 5 | 170 | 0.06 |
| 16 | 0.07 | 1.34 | 0.0148 | 650 | 1200 | 5 | 150 | 0.05 |
Table 1
| Embodiment | Carbon content % | Embodiment | Carbon content % | Embodiment | Carbon content % | Embodiment | Carbon content % |
| 1 | 0.04 | 5 | 0.04 | 9 | 0.04 | 13 | 0.04 |
| 2 | 0.06 | 6 | 0.04 | 10 | 0.03 | 14 | 0.02 |
| 3 | 0.04 | 7 | 0.04 | 11 | 0.04 | 15 | 0.06 |
| 4 | 0.05 | 8 | 0.02 | 12 | 0.04 | 16 | 0.05 |
Table 2
Claims (4)
1, the control method of carbon content in ultralow carbon high strength high toughness steel is characterized in that, this method may further comprise the steps:
1) adopt semikilled steel, the molten steel oxygen activity remains on 0.0080～0.0150% before the vacuum-treat, carbon content remains on below 0.10%; Adopt the mid-carbon fe-mn alloying, manganese content is more than 1.30% before the vacuum-treat;
2) during vacuum-treat, vacuum tightness remains on below the 300Pa, utilizes the reaction between carbon and oxygen decarburization.
2, the control method of carbon content in ultralow carbon high strength high toughness steel as claimed in claim 1 is characterized in that, during the described vacuum-treat of step 2, vacuum tubular stinger depth of penetration is more than 650mm.
3, the control method of carbon content in ultralow carbon high strength high toughness steel as claimed in claim 1 is characterized in that, during the described vacuum-treat of step 2, the omnidistance lift gas flow of vacuum remains on 1000～1200NL/min.
4, the control method of carbon content in ultralow carbon high strength high toughness steel as claimed in claim 1 is characterized in that, during the described vacuum-treat of step 2, the vacuum decarburization time is 5min.
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| CNB2007100487277A CN100457949C (en) | 2007-03-26 | 2007-03-26 | Method of controlling carbon content in ultralow carbon high strength high toughness steel |
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| CNB2007100487277A CN100457949C (en) | 2007-03-26 | 2007-03-26 | Method of controlling carbon content in ultralow carbon high strength high toughness steel |
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| CN101020984A CN101020984A (en) | 2007-08-22 |
| CN100457949C true CN100457949C (en) | 2009-02-04 |
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| CN105463316B (en) * | 2014-09-09 | 2017-04-12 | 河北钢铁股份有限公司唐山分公司 | Method for producing ultra-low carbon steel on basis of flexible thin slab casting (FTSC) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63143216A (en) * | 1986-12-05 | 1988-06-15 | Nippon Steel Corp | Melting method for extremely low carbon and low nitrogen steel |
| JPH08283824A (en) * | 1995-04-17 | 1996-10-29 | Nippon Steel Corp | Production of dead soft steel excellent in surface property |
| JPH09170013A (en) * | 1995-12-18 | 1997-06-30 | Nkk Corp | Method for melting extra-low carbon and high manganese steel |
| CN1410559A (en) * | 2002-11-25 | 2003-04-16 | 武汉钢铁(集团)公司 | Method of producing super low carbon steel using vacuum degassing |
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2007
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63143216A (en) * | 1986-12-05 | 1988-06-15 | Nippon Steel Corp | Melting method for extremely low carbon and low nitrogen steel |
| JPH08283824A (en) * | 1995-04-17 | 1996-10-29 | Nippon Steel Corp | Production of dead soft steel excellent in surface property |
| JPH09170013A (en) * | 1995-12-18 | 1997-06-30 | Nkk Corp | Method for melting extra-low carbon and high manganese steel |
| CN1410559A (en) * | 2002-11-25 | 2003-04-16 | 武汉钢铁(集团)公司 | Method of producing super low carbon steel using vacuum degassing |
Non-Patent Citations (6)
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| RH钢水二次精炼法的发展. 耿文范.钢铁研究学报，第3卷第1期. 1991 |
| RH钢水二次精炼法的发展. 耿文范.钢铁研究学报，第3卷第1期. 1991 * |
| 半镇静易切削钢中氧活度的测定与控制. 封顺怀等.钢铁，第31卷第2期. 1996 |
| 半镇静易切削钢中氧活度的测定与控制. 封顺怀等.钢铁，第31卷第2期. 1996 * |
| 攀钢生产半镇静钢的可行性探讨. 杨素波，韦世通.钢铁钒钛，第12卷第4期. 1991 |
| 攀钢生产半镇静钢的可行性探讨. 杨素波，韦世通.钢铁钒钛，第12卷第4期. 1991 * |
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