CN101358280A - Method for improving carbon steel solidification structure using high voltage electropulse - Google Patents
Method for improving carbon steel solidification structure using high voltage electropulse Download PDFInfo
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- CN101358280A CN101358280A CNA200810151116XA CN200810151116A CN101358280A CN 101358280 A CN101358280 A CN 101358280A CN A200810151116X A CNA200810151116X A CN A200810151116XA CN 200810151116 A CN200810151116 A CN 200810151116A CN 101358280 A CN101358280 A CN 101358280A
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Abstract
The invention discloses a method for improving the carbon steel solidification structure by adopting high voltage electrical pulse. The method is that in a continuous casting tundish and a continuous casting mould or a moulded casting mould, a selected high voltage electrical pulse is applied to the carbon steel solidification process or before carbon steel solidifying; the high voltage electrical pulse has the following parameters: the pulsed voltage is from 1000V to 3900V, the pulse rate is from 0.50Hz to 1.5Hz, and the pulse capacitor is from 100 microfarad to 500 microfarad. The method is especially suitable for steel grades to improve large coarse grains in the solidification structure, developed dendrite and easy generation of composition segregation, can increase the nucleation rate of metal solidification, reduce dendrite, increase equiaxed grains, reduce the internal cracks, the shrinkage holes and the loose of the solidification structure, and improve the composition segregation; and the mechanical properties of the processed steel are improved.
Description
Technical field
The present invention relates to the method that a kind of high electric field pulse improves carbon steel solidification tissue and performance, it is thick especially to be adapted to improve in the solidified structure crystal grain, and the dentrite prosperity easily produces the steel grade of component segregation.
Background technology
Last century end has proposed the notion of ferrous materials of new generation (super-steel), has obtained showing great attention to of countries in the world, and its way mainly is that chemical ingredients (microalloying), microstructure morphology, solid-state deformation and the grain refining by the control steel waits and realize.Wherein core technology is grain refining, promptly ultra-fine crystal technique, and by with order of magnitude of current steel grain-size refinement, the intensity of ferrous materials can double, and keeps good plasticity and toughness simultaneously.And apply a selected high electric field pulse solidified structure is effectively improved in the molten steel solidification process or before solidifying, the branch crystalline region dwindles, one para-crystal arm obtains refinement, two para-crystal arms reduce, the equiax crystal district enlarges, and refinement is even, and can make internal fissure, shrinkage cavity and the loose elimination basically of steel, the composition segregation improves, and the mechanical property of steel obtains certain raising after handling.
According to existing document record, in 1985, it was 30～40mAcm that India scholar Misra has studied electric current
-2, voltage is about the influence of the galvanic current of 30V to Pb-Sb15%-Sn7% alloy graining tissue, finds that alloy graining is organized after treatment not only to have obtained refinement, and becomes more even.People such as Masayuki NAKADA have studied the influence to Sn-15%Pb alloy graining tissue of each parameter of electricimpulse and speed of cooling, the result shows the increase with voltage on capacitor, capacitance and speed of cooling, dentrite is less, and changes to globular crystal gradually; The various countries scholar has launched experimental study in low-melting pure metal and alloy subsequently.Research for refractory metals such as ferrous materials is less, and it is less that selected electricimpulse is handled electrical parameter, and pulsed voltage is generally about 1000V, and almost not to the research that experimentizes of electric pulses affect carbon steel microcosmic solidified structure and mechanical property.
Summary of the invention
The objective of the invention is to, a kind of method that adopts high electric field pulse to improve carbon steel solidification tissue and performance is provided, it is thick particularly to provide a kind of high electric field pulse to improve in the solidified structure crystal grain, the dentrite prosperity, easily produce the solidifying fine crystal method of the steel grade of component segregation, to obtain the effect that ideal comparatively improves the carbon steel solidification tissue.
In order to realize above-mentioned task, the present invention takes following technical solution:
A kind of method that adopts high electric field pulse to improve the carbon steel solidification tissue, it is characterized in that, in the casting mold of this method in the crystallizer of the tundish of continuous casting steel machine and continuous casting steel machine or in die casting, apply a selected high electric field pulse to the carbon steel solidification process or before solidifying, the parameter of described high-voltage pulse is: pulsed voltage 1000V～3900V, pulse-repetition 0.50Hz～1.5Hz, pulsed capacitance 100 μ F～500 μ F.And, under the condition of the different curing conditions and the steel grade of handling, after selecting the appropriate electrical pulse parameter to handle, macroscopical solidified structure generation considerable change of carbon steel, originally thick dentrite can be refined as tiny and uniform equiax crystal, and considerable change has also taken place in the microcosmic solidified structure, the Wei Shi ferritic structure obviously reduces, and obtains refinement, and content of pearlite in alloy increases, sheet interlayer spacing attenuation, and appearance granular and globular pearlite in various degree.Carbon steel carried out after electricimpulse handles solidifying preceding or solidify the back, the coagulation defect of carbon steel strand or ingot casting can necessarily be improved, and C, Si, S, P etc. the easily degree of segregation of segregation element also have certain reduction; Electricimpulse has some improvement to the mechanical property of carbon steel solidification tissue, and the intensity of carbon steel, hardness are improved, and plasticity and toughness improve.
The present invention is solidified the crystal grain thinning technology with existing other and is compared the advantage with following uniqueness:
(1) parameters such as selected voltage, electric capacity are relatively large, can realize that comparatively ideal improves carbon steel solidification tissue effect;
(2) can accurately regulate the electrical parameter of electricimpulse according to handling steel grade and curing condition, realize accurate control the carbon steel solidification tissue;
(3) do not need to add alloying element, pollution-free to molten steel and equipment, be the solidifying fine crystal new technology of an environmental protection;
(4) technical process is simple, and is easy to operate, helps realizing serialization production;
(5) equipment is simple, and floor space is little, less investment, save energy.
Description of drawings
Fig. 1 is that electricimpulse wherein, is not handle 45 steel macroscopic view solidified structure picture through electricimpulse (a) to the influence of 45 steel solidified structures in the process of setting, (b) is the 45 steel macroscopic view solidified structure picture of handling through the 2600V electricimpulse in process of setting;
Fig. 2 be in the process of setting different pulsed voltages in 45 steel easily segregation element C, Si, P, S content in the influence of the distribution of sample profile, wherein, (a) distribution of C element, (b) distribution of S element, (c) distribution of P element, (d) distribution of Si element;
Fig. 3 is that electricimpulse wherein, (a) is the 45 steel macroscopic view solidified structure picture of not handling through electricimpulse to the influence of 45 steel solidified structures before solidifying, and (b) is the 45 steel macroscopic view solidified structure picture of handling through the 2600V electricimpulse before solidifying.
Fig. 4 is that electricimpulse wherein, is that the 30Mn steel is not handled macroscopical solidified structure picture through electricimpulse (a) to the influence of 30Mn steel solidified structure in the process of setting, (b) is the 30Mn steel macroscopic view solidified structure picture of handling through the 3670V electricimpulse in process of setting;
The present invention is described in further detail below in conjunction with embodiment that accompanying drawing and contriver provide.
Embodiment
Below be the embodiment that the contriver provides, need to prove, the invention is not restricted to these embodiment, method of the present invention is applicable to improves soft steel (ω [C]＜0.25%), medium carbon steel (0.25%≤ω [C]≤0.60%) or high carbon steel (ω [C]＞0.60%), to increase the nucleation rate of molten steel solidification, reduces dentrite, increase equiax crystal, reduce internal fissure, the shrinkage cavity and loose of solidified structure, improve the composition segregation, and the mechanical property of the steel after handling obtains certain raising.
Embodiment 1:
The material of present embodiment is 45 steel (its main chemical compositions is: 0.43%C, 0.58%Mn, 0.22%Si, 0.003%S, 0.02%P), melt through medium-frequency induction furnace, liquid steel temperature is reached about 1540 ℃, and insulation 5min makes molten steel composition and temperature even, after carrying out deoxidation with aluminium wire, be cast in advance and (be of a size of 75 * 75 * 75mm in the square casting mold with the heat-insulating shield combination
3), the starting impulse signal generator carries out electricimpulse and handles, and till molten steel all solidified, main electric parameters was: voltage 2600V, frequency 0.86Hz (duration of charging 0.73s, discharge time 0.43s), condenser capacity 200 μ F.The figure (a) and (b) are respectively to handle 45 steel macroscopic view solidified structure through the electricimpulse processing with through the 2600V electricimpulse.Can find out clearly that by figure after handling through electricimpulse, thick dentrite is refined as tiny and uniform equiax crystal.Same electricimpulse also has certain influence to component segregation, and Fig. 2 is easy segregation element C, S, P, the Si variation relation with pulsed voltage.
Embodiment 2:
The material of present embodiment is that (its main chemical compositions is 45 steel: 0.43%C-0.58%Mn-0.22%Si-0.003%S-0.02%P), 45 steel that weigh up are in advance added medium-frequency induction furnace, heat fused is carried out in energising, liquid steel temperature is reached about 1540 ℃, and insulation 5min makes molten steel composition and temperature even, after carrying out deoxidation with aluminium wire, directly electrode is inserted in the molten steel of induction furnace, close the induction furnace power switch, the restart pulse signal generator, main electric parameters is: voltage 2900V frequency 0.96Hz (duration of charging 0.73s, discharge time 0.43s), condenser capacity 300 μ F, electricimpulse is handled before solidifying, treatment time is 60s, and the molten steel casting after will handling is to (being of a size of 75 * 75 * 75mm in the square casting mold with the heat-insulating shield combination in advance
3).Fig. 3 (a) and (b) are respectively not through the electricimpulse processing with through the macroscopical solidified structure of 45 steel of 2600V electricimpulse processing.Can find out clearly that by figure after handling through electricimpulse, thick dentrite all is refined as tiny and uniform equiax crystal.
Embodiment 3:
The material of present embodiment is that (its main chemical compositions is the 30Mn steel: 0.28%C-0.84%Mn-0.32%Si-0.028%S-0.032%P), with medium-frequency induction furnace (CW-1JJ) the 30Mn steel is melted earlier, liquid steel temperature is reached about 1560 ℃, and insulation 5min, carry out being cast in the good heat insulation effect heat-insulating shield casting mold after the deoxidation with aluminium wire, insert electrode rapidly, the unbalanced pulse signal generator carries out electricimpulse to be handled, till molten steel all solidifies.The parameter of pulse signal generator is: pulsed voltage is 3670V, and frequency is 1.14Hz (duration of charging 0.58s, discharge time 0.30s), and condenser capactiance is 500 μ F.
Fig. 4 (a) and (b) are respectively not through the electricimpulse processing with through the macroscopical solidified structure of the 30Mn steel of 3670V electricimpulse processing.Can find out clearly that by figure after handling through electricimpulse, thick dentrite all is refined as tiny and uniform equiax crystal.
Claims (2)
1, a kind of method that adopts high electric field pulse to improve the carbon steel solidification tissue, it is characterized in that, in the casting mold of this method in the crystallizer of the tundish of continuous casting steel machine and continuous casting steel machine or in die casting, apply a selected high electric field pulse to the carbon steel solidification process or before solidifying, the parameter of described high-voltage pulse is: pulsed voltage 1000V～3900V, pulse-repetition 0.50Hz～1.5z, pulsed capacitance 100 μ F～500 μ F.
2, the method for claim 1 is characterized in that, said carbon steel is the soft steel of ω [C]＜0.25%, or the medium carbon steel of 0.25%≤ω [C]≤0.60%, or the high carbon steel of ω [C]＞0.60%.
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102078948A (en) * | 2011-01-28 | 2011-06-01 | 河北文丰钢铁有限公司 | Continuous casting pouring device for electrical pulse inoculation |
| CN102310174A (en) * | 2011-09-07 | 2012-01-11 | 中国科学院金属研究所 | Method and device for improving metal solidification defects and refining solidification textures |
| CN102615258A (en) * | 2012-04-13 | 2012-08-01 | 武汉钢铁(集团)公司 | Method for producing high-quality 65Mn steel mould ingot in pilot plant |
| CN102703679A (en) * | 2012-06-19 | 2012-10-03 | 安徽工业大学 | Method for improving corner flaw and heat-transfer flaw of niobium-containing steel casting blank by adopting low-voltage pulse current |
| CN106141126A (en) * | 2015-03-25 | 2016-11-23 | 宝山钢铁股份有限公司 | Improve the device and method of continuous casting billet solidified structure |
| CN107716887A (en) * | 2017-10-09 | 2018-02-23 | 中南大学 | A kind of lower steel liquid solidification simulator in continuous casting crystallizer of electric pulse effect |
| CN107790650A (en) * | 2016-09-06 | 2018-03-13 | 鞍钢股份有限公司 | A kind of micro alloyed steel directly fills the control method for rolling plate crackle |
| CN107999718A (en) * | 2017-12-07 | 2018-05-08 | 安徽工业大学 | A kind of method for improving micro-alloyed steel continuous casting process castability |
| CN111485095A (en) * | 2020-05-11 | 2020-08-04 | 北京科技大学 | Control method for promoting homogenization treatment of continuous casting slab |
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2008
- 2008-09-26 CN CN200810151116XA patent/CN101358280B/en not_active Expired - Fee Related
Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102078948A (en) * | 2011-01-28 | 2011-06-01 | 河北文丰钢铁有限公司 | Continuous casting pouring device for electrical pulse inoculation |
| CN102078948B (en) * | 2011-01-28 | 2012-10-03 | 河北文丰钢铁有限公司 | Continuous casting pouring device for electrical pulse inoculation |
| CN102310174B (en) * | 2011-09-07 | 2013-06-05 | 中国科学院金属研究所 | Method and device for improving metal solidification defects and refining solidification textures |
| CN102310174A (en) * | 2011-09-07 | 2012-01-11 | 中国科学院金属研究所 | Method and device for improving metal solidification defects and refining solidification textures |
| CN102615258A (en) * | 2012-04-13 | 2012-08-01 | 武汉钢铁(集团)公司 | Method for producing high-quality 65Mn steel mould ingot in pilot plant |
| CN102615258B (en) * | 2012-04-13 | 2014-01-22 | 武汉钢铁(集团)公司 | Method for producing high-quality 65Mn steel mould ingot in pilot plant |
| CN102703679A (en) * | 2012-06-19 | 2012-10-03 | 安徽工业大学 | Method for improving corner flaw and heat-transfer flaw of niobium-containing steel casting blank by adopting low-voltage pulse current |
| CN102703679B (en) * | 2012-06-19 | 2013-06-05 | 安徽工业大学 | Method for improving corner flaw and heat-transfer flaw of niobium-containing steel casting blank by adopting low-voltage pulse current |
| CN106141126A (en) * | 2015-03-25 | 2016-11-23 | 宝山钢铁股份有限公司 | Improve the device and method of continuous casting billet solidified structure |
| CN107790650A (en) * | 2016-09-06 | 2018-03-13 | 鞍钢股份有限公司 | A kind of micro alloyed steel directly fills the control method for rolling plate crackle |
| CN107790650B (en) * | 2016-09-06 | 2019-03-26 | 鞍钢股份有限公司 | A kind of micro alloyed steel directly fills the control method for rolling plate crackle |
| CN107716887A (en) * | 2017-10-09 | 2018-02-23 | 中南大学 | A kind of lower steel liquid solidification simulator in continuous casting crystallizer of electric pulse effect |
| CN107999718A (en) * | 2017-12-07 | 2018-05-08 | 安徽工业大学 | A kind of method for improving micro-alloyed steel continuous casting process castability |
| CN111485095A (en) * | 2020-05-11 | 2020-08-04 | 北京科技大学 | Control method for promoting homogenization treatment of continuous casting slab |
| CN111485095B (en) * | 2020-05-11 | 2021-05-04 | 北京科技大学 | Control method for promoting homogenization treatment of continuous casting slab |
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