CN102398007A - Soft reduction process for continuous casting of large square billet of high chrome alloy steel - Google Patents
Soft reduction process for continuous casting of large square billet of high chrome alloy steel Download PDFInfo
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Abstract
The invention provides a soft reduction process for the continuous casting of a large square billet of high chrome alloy steel. The process is used for the process of solidifying a continuous casting billet cooled by spraying water in a secondary cooling area. The process is characterized in that a continuous casting soft reduction technology is implemented in a solid-liquid two-phase area at the solidification tail end of the continuous casting billet, namely the continuous casting billet is subjected to trace pressing displacement by a plurality of pairs of clamping rollers to compensate solidification shrinkage at the tail end. According to the soft reduction process, the internal quality of the large continuous casting square billet of the high chrome alloy steel is improved by utilizing a soft reduction device arranged by an arc-shaped continuous casting machine, so that the central porosity and central shrinkage of the continuous casting billet are relieved obviously, and cracks of a core part are prevented.
Description
Technical field
The present invention relates to the metallurgical casting field, particularly, what the present invention relates to a kind of continuous casting that is used for the high chrome alloy steel bloom gently depresses technology.The continuous casting that is used for the high chrome alloy steel bloom of the present invention gently depress the internal soundness that technology can improve the high chrome alloy steel bloom.
Background technology
In the metallurgical casting field, the high chrome alloy steel heat conductivility is poor, and solidification morphology is complicated, and casting rate and cooling are had strict requirement, adopts the die casting mode to produce usually.
In recent years, oil well, station boiler, chemical industry constantly increase the demand of high-chromium alloy steel pipe, for economical and efficient ground produces, adopt continuous casting and hot-rolling process for seamless tubes to make the high-chromium alloy steel pipe.
Casting process is that high-temperature molten steel is continuously watered in one or several crystallizer with Forced water cooling; Molten steel condenses in the dummy bar head that is placed on crystallizer in advance very soon; After treating that molten steel solidification becomes certain thickness base shell, just pull out dummy bar head from the lower end of crystallizer.Being frozen into certain thickness continuous casting blooms so will be drawn out in water mold continuously, continues the water spray cooling at secondary cooling zone.Through the straightening machine travel, have the strand of liquid core, solidify while move, up to solidifying fully.After treating that continuous casting billet solidifies fully, cut into certain-length to strand with oxygen cutter.This technology that directly pours into steel billet to high-temperature molten steel is continuous casting steel machine.
In the continuous casting casting cycle, continuous casting billet solid-liquid two-phase region can occur when process of setting.At solid-liquid two-phase region, because solidification shrinkage, when can not get liquid molten steel and effectively fill, continuous casting billet can produce loose and hole, forms the central pipe of continuous casting billet.High chrome alloy steel Molten Steel Flow property in casting cycle is very poor, more is easy to generate the central pipe defective.Because high chrome alloy steel process of setting body shrinkage factor is big, further cooling contraction will cause the core crackle after in a single day continuous casting billet formed central pipe.These defectives of continuous casting billet can produce a large amount of defectives at steel pipe internal-surface and cause scrapping when rolling seamless steel pipe.Therefore, high chrome alloy steel strand internal soundness directly influences continuous rolling-tube unit rolling seamless steel pipe inner surface quality.
Publication number for the Japanese Patent Application Publication of " spy open flat 8-332556 " a kind of method of improving the continuous casting billet internal soundness.According to the disclosure of this patent documentation, technology is after continuous casting two cold finishes, and further cools off continuous casting blooms (little square billet) in contiguous continuous casting billet solidification end position, is used for reducing continuous casting billet core center porosity, prevents the core crackle.Yet this method need increase cooling device in contiguous continuous casting billet solidification end position.
Publication number discloses a kind of dynamic soft reduction technologies for bloom continuous casting of heavy rail for the one Chinese patent application of " CN101036921 "; Be used to alleviate high-carbon steel continuous casting bloom center segregation, center porosity, central pipe, prevent internal flaws such as centre burst, middle crack.Yet this method only is confined to the high-carbon Properties of Heavy Rail Steel By.
Summary of the invention
For overcoming said problem; The present invention seeks to, what a kind of continuous casting that is used for the high chrome alloy steel bloom was provided gently depresses technology, promptly in continuous casting working procedure; Utilize the light screwdown gear of circular-arc type continuous casting machine configuration; Improve high chrome alloy steel continuous casting blooms internal soundness, significantly alleviate continuous casting billet center porosity and central pipe thus, prevent the core crackle.
Technical scheme of the present invention is following:
A kind of be used for the high chrome alloy steel bloom continuous casting gently depress technology; Be used for it is characterized in that, at the solid-liquid two-phase region of continuous casting (generous) base solidification end at the secondary cooling zone cooled continuous casting billet solidification processing of spraying water; The light screwdown gear that employing is made up of several frames; Implement continuous casting and gently depress technology, it is through nip rolls continuous casting billet to be applied the micro-displacement of depressing that said continuous casting is gently depressed technology, to compensate terminal solidification shrinkage.
Thus, adopting continuous casting gently to depress technology can control centre's shrinkage cavity and core crackle, improves the continuous casting blooms internal soundness effectively.
The principle of gently depressing technology that is used for the high chrome alloy steel bloom continuous casting of the present invention is: obtain suitable casting blank solidification end solid rate through control continuous casting technology, thereby obtain suitable pressure range; Select suitable continuous casting gently to depress technological parameter, alleviate the strand central pipe, prevent the core crackle.
Be used for conticaster and gently depress the nip rolls of technology and claim the straightening roller again, 3 effects are arranged: 1. through clamping the strand speed that travels forward, control strand pulling rate; 2. controlling strand travels forward and fades to horizontal direction by vertical direction in the process; 3. implement gently to depress technology.Because gently depressing technology has the solid rate requirement to pressure range (if the pressure range solid rate surpasses the critical one after another of crossing, implement gently to depress in the crackle sensitizing range, strand is easy to generate underbead crack.), according to different steel grades, usually can be only to some nip rolls, for example, 3-5 implements gently to depress effect to nip rolls, and other nip rolls mainly plays the straightening effect.
According to of the present invention be used for the high chrome alloy steel bloom continuous casting gently depress technology, it is characterized in that the said technological parameter of gently depressing comprises: pressure range, drafts and reduction ratio, said pressure range are continuous casting billet solid rate f
sThe solid-liquid two-phase region scope of=30-80%; Said drafts refers to the roll gap amount of contraction (mm) perpendicular to the nip rolls of the throwing direction of continuous casting billet; Said reduction ratio refers to the drafts (mm/m) of continuous casting billet along throwing direction unit length, and the strain stress that reduction ratio produces is less than critical strain ε
c, that is: ε＜ε
C., the strain stress that reduction ratio produces is confirmed by following formula:
In the formula: Δ h---drafts, mm;
The S---shell thickness, mm;
The L---roll spacing, mm,
Shell thickness is meant the solidified layer thickness when the continuous casting billet ecto-entad solidifies, concrete critical strain ε
cBe 5.86%-10.66%.
Among the present invention, roll spacing is 1100mm.
The characteristic and the mechanical behavior under high temperature of the solid-liquid two-phase region of the definite and steel of these technological parameters are relevant.See table 3
In solid-liquid two-phase region mechanical behavior under high temperature characteristic, two-phase section is divided into liquid phase fill area and crackle sensitizing range according to steel, with critical fraction solid f
ScDivide.Solid rate fs＜fsc zone is the liquid phase fill area, and the liquid phase that can be infiltrated at this zone crackle is filled and disappeared; Solid rate fs＞fsc zone is the crackle sensitizing range, and intensive dendrite has hindered the liquid phase filling in this zone, crackle can't be made up and remains.
If implement gently to depress in the crackle sensitizing range; Because steel is very low in the critical intensity of two-phase section; The stretching strain that the continuous casting billet solidification front bears surpasses a certain critical value; Or tension is when surpassing near the intensity the setting temperature of steel, and continuous casting billet just possibly produce the brilliant crackle in edge at solidification front, and is extended to middle crack at solidification front.Therefore, continuous casting is gently depressed the zone of action and should be avoided between the crackle sensitizing range.Because the freezing range structure of different steel grades is different, the pressure range that high-alloy steel is suitable is strand solid rate f
sThe solid-liquid two-phase region scope of=30-80%.
According to continuous casting billet solidification and heat transfer mathematical simulation, continuous casting billet pouring temperature, casting rate and the secondary type of cooling change, and will cause solid-liquid two-phase region position and two-phase section interval range to change.Therefore, select the suitable continuous casting secondary type of cooling, control molten steel pouring temperature and casting rate, can obtain suitable continuous casting billet solidification end interval and solid rate, thereby obtain suitable pressure range.
Drafts refers to gently depress roll gap contraction total amount in the technology, comprises continuous casting billet solidification shrinkage amount and the practical function drafts on continuous casting billet.When drafts is too small,, also not obvious for the improvement of central pipe because solidification shrinkage can not get abundant compensation; When drafts was excessive, continuous casting billet bore excessive extrusion, may cause that the molten steel of ot-yet-hardened and enrichment solute element flows to adjacent bulge district, white band, negative segregation occurred, even caused the continuous casting billet implosion, or cause gently depressing the damage of district's nip rolls.Therefore, the size of drafts is wanted the solidification shrinkage in can the full remuneration pressure range, avoids continuous casting billet to produce implosion simultaneously, and the reaction force that produces when depressing will be in casting machine fan-shaped section allowable load scope.
In addition, light screwdown gear is made up of several frames, and each frame has a pair of nip rolls control drafts.Whether the reduction ratio formula mainly is used for each frame reduction ratio of verification above the maximum depression rate, avoids strand inside to crack.The same continuous casting process that depends on pressure range of shell thickness, roll spacing is then determined by conticaster equipment.
The reduction ratio of continuous casting billet can not be too big, and the ess-strain of continuous casting billet need guarantee within the critical strain that continuous casting billet cracks.
According to high chrome alloy steel bloom of the present invention gently depress technology, it is characterized in that the control continuous casting is gently depressed regional strand solid rate f
s=30-80% gently depresses overall reduction 8-12mm.
According to high chrome alloy steel bloom of the present invention gently depress technology, it is characterized in that the said single frame maximum reduction≤3.0mm that gently depresses technology, maximum depression rate≤3.0mm/m.
According to high chrome alloy steel bloom of the present invention gently depress technology, it is characterized in that the said nine pairs of nip rolls of process using of gently depressing apply the displacement of depressing of trace to continuous casting billet to nip rolls through 3-5 wherein.
Continuous casting process according to high chrome alloy steel bloom of the present invention is characterized in that, said gently depressing in the technology, and the control molten steel overheat is at 20-35 ℃, and the continuous casting billet pulling rate is at 0.55-0.65m/min;
Continuous casting process according to high chrome alloy steel bloom of the present invention; It is characterized in that; Cold uniform distribution cooling water control mode a little less than adopt in said secondary cooling zone territory, the said continuous casting ratio water yield of gently depressing in the technology (steel per ton is used cooling water inflow) is controlled at 0.19-0.25l/kg.
Thus, can obtain required continuous casting and gently depress regional strand solid rate, obtain suitable light pressure range.
According to high chrome alloy steel bloom of the present invention gently depress technology, it is characterized in that said high chrome alloy steel is that chrome content is the high chrome alloy steel of 8-14%.
According to high chrome alloy steel bloom of the present invention gently depress technology, utilize arc large square bland continuous-casting machine economical and efficient to produce high chrome alloy steel, the continuous casting blooms of casting is eliminated central pipe and crackle basically.With static ingot relatively, the internal soundness that is rolled into round base is suitable, it is about 10% that lumber recovery improves, and can reduce the high chrome alloy steel manufacturing cost significantly.
The specific embodiment
Below, specify the present invention with embodiment.
Embodiment 1-6 (A-F)
Adopt nine pairs of nip rolls, to 2-6 nip rolls wherein in secondary cooling zone is sprayed water cooled continuous casting billet solidification processing, implement chrome content and be 8-14% high chrome alloy steel bloom continuous casting gently depress technology.Continuous casting blooms size: 320 * 425mm.
Cold uniform distribution cooling water control mode a little less than adopt in the secondary cooling zone territory.
Said pressure range is continuous casting billet solid rate f
sThe solid-liquid two-phase region scope of=30-80%.
Said drafts refers to the roll gap amount of contraction (mm) perpendicular to the nip rolls of the throwing direction of continuous casting billet, and said reduction ratio refers to the drafts (mm/m) of continuous casting billet along throwing direction unit length, and the strain stress that reduction ratio produces is less than critical strain ε
c
The overall reduction of gently depressing of embodiment 1-6 (A-F) is respectively 8,12,8,10,8,8mm, the said single frame maximum reduction≤3.0mm that gently depresses technology, maximum depression rate≤3.0mm/m.
Embodiment 1-6 (A-F) gently depresses in the technology, controls molten steel overheat respectively at 22-35 ℃, and said continuous casting billet pulling rate is controlled at 0.60-0.65m/min respectively.
Table 1 is the composition of the high chrome alloy steel of embodiment 1-6 (A-F), and table 2 is embodiment 1-6 (A-F) embodiment 1-6 (A-F) technology and effect.Table 3 is critical strain ε c and steel grades and temperature relation table, obtains through actual measurement.
Table 1
Unit: wt%
Table 2
Table 3
The critical strain ε c value of embodiment of the invention steel grade:
Temperature
The continuous casting that is used for the high chrome alloy steel bloom of the present invention gently depress technology; In continuous casting working procedure, utilize the light screwdown gear of circular-arc type continuous casting machine configuration, improve high chrome alloy steel continuous casting blooms internal soundness; Significantly alleviate continuous casting billet center porosity and central pipe thus, prevent the core crackle.
Claims (8)
- One kind be used for the high chrome alloy steel bloom continuous casting gently depress technology; Be used at the secondary cooling zone cooled continuous casting billet solidification processing of spraying water; It is characterized in that; At the solid-liquid two-phase region of continuous casting billet solidification end, through nip rolls continuous casting billet is applied the micro-displacement of depressing, to compensate terminal solidification shrinkage.
- 2. as claimed in claim 1 be used for the high chrome alloy steel bloom continuous casting gently depress technology, it is characterized in that the said technological parameter of gently depressing comprises: pressure range, drafts and reduction ratio, said pressure range are continuous casting billet solid rate f sThe solid-liquid two-phase region scope of=30-80%; Said drafts refers to the roll gap amount of contraction (mm) perpendicular to the nip rolls of the throwing direction of continuous casting billet; Said reduction ratio refers to the drafts (mm/m) of continuous casting billet along throwing direction unit length, and the strain stress that reduction ratio produces is less than critical strain ε c, that is: ε＜ε C., the strain stress that reduction ratio produces is confirmed by following formula:In the formula: Δ h---drafts, mm;The S---shell thickness, mm;The L---roll spacing, 1100mm,Concrete critical strain ε cBe 5.86%-10.66%.
- 3. high chrome alloy steel bloom as claimed in claim 1 gently depress technology, it is characterized in that the control continuous casting is gently depressed regional strand solid rate f s=30-80% gently depresses overall reduction 8-12mm.
- 4. the continuous casting process of high chrome alloy steel bloom as claimed in claim 1 is characterized in that, the said single frame maximum reduction≤3.0mm that gently depresses technology, maximum depression rate≤3.0mm/m.
- 5. high chrome alloy steel bloom as claimed in claim 1 gently depress technology, it is characterized in that the said 9 pairs of nip rolls of process using of gently depressing apply the displacement of depressing of trace to continuous casting billet to nip rolls through 3-5 wherein.
- 6. high chrome alloy steel bloom as claimed in claim 1 gently depress technology, it is characterized in that, said gently depressing in the technology, the control molten steel overheat is at 20-35 ℃, the continuous casting billet pulling rate is at 0.55-0.65m/min.
- 7. high chrome alloy steel bloom as claimed in claim 1 gently depress technology; It is characterized in that cold uniform distribution cooling water control mode a little less than adopt in said secondary cooling zone territory, the said continuous casting ratio water yield of gently depressing in the technology; Be that steel per ton is used cooling water inflow, be controlled at 0.19-0.25l/kg.
- 8. the continuous casting process of high chrome alloy steel bloom as claimed in claim 1 is characterized in that, said high chrome alloy steel bloom is that chrome content is the high chrome alloy steel bloom of 8-14%.
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| CN103128247A (en) * | 2013-03-15 | 2013-06-05 | 北京科技大学 | Method for producing 60 mm extra-thick steel plates with low compression ratio |
| CN103934283A (en) * | 2013-12-04 | 2014-07-23 | 广西柳州银海铝业股份有限公司 | Rolling method for preventing cracks from being formed at two ends of rolled slab ingot |
| CN105121062A (en) * | 2013-06-18 | 2015-12-02 | 新日铁住金株式会社 | Continuous casting method for casting for extra thick steel sheet |
| CN105839002A (en) * | 2016-05-30 | 2016-08-10 | 内蒙古包钢钢联股份有限公司 | Continuous casting process for bainite steel billet |
| CN106563781A (en) * | 2016-11-02 | 2017-04-19 | 首钢总公司 | Soft pressing control method for container steel resistant to hydrogen induced cracks |
| CN106917050A (en) * | 2017-03-29 | 2017-07-04 | 海城市欣锐铸件有限公司 | A kind of continuous cast method of anti-corrosion spiral |
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| CN106563781A (en) * | 2016-11-02 | 2017-04-19 | 首钢总公司 | Soft pressing control method for container steel resistant to hydrogen induced cracks |
| CN106917050A (en) * | 2017-03-29 | 2017-07-04 | 海城市欣锐铸件有限公司 | A kind of continuous cast method of anti-corrosion spiral |
| CN109550915A (en) * | 2017-09-25 | 2019-04-02 | 上海梅山钢铁股份有限公司 | A method of control fine steel center segregation of continuous cast slab and loose |
| CN109550915B (en) * | 2017-09-25 | 2021-06-08 | 上海梅山钢铁股份有限公司 | Method for controlling center segregation and loosening of fine blanking steel continuous casting slab |
| CN110929355A (en) * | 2019-12-19 | 2020-03-27 | 东北大学 | Method for predicting crack risk of continuous casting billet and application thereof |
| CN110929355B (en) * | 2019-12-19 | 2021-07-27 | 东北大学 | Method for predicting crack risk of continuous casting billet and application thereof |
| WO2024037063A1 (en) * | 2022-08-16 | 2024-02-22 | 江苏省沙钢钢铁研究院有限公司 | High-carbon steel wire rod and production method therefor |
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