CN102921914A - Heavy reduction technology for improving center segregation and center porosity of super-thick slabs - Google Patents
Heavy reduction technology for improving center segregation and center porosity of super-thick slabs Download PDFInfo
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Abstract
The invention discloses a heavy reduction technology for improving center segregation and center porosity of super-thick slabs. The heavy reduction technology is characterized in that the oil cylinder pressure of hydraulic cylinders on three sectorial sections of solidification tail ends of the continuous casting slabs ranges from 1800KN to 2500KN; and according to the solidification characteristics of steel types, the superheat degree of molten steel is controlled between 10-35 DEG C, the casting speed of a casting machine is controlled between 0.6 meter/minute and 1.0 meter/minute, the specific water flow of a secondary cooling zone is controlled between 0.4 and 0.6 liter/kilogram, large pressure is applied to one sectorial section to achieve the reduction of 5.0-12.0 millimeters, and the other two sectorial sections are slightly pressed to achieve reductions of 2-3 millimeters. The heavy reduction technology can be implemented to improve the quality of the super-thick slabs which further can be used for substituting for static ingots to produce super-thick steel plates with the thickness of 100millimeters and more, and the heavy reduction technology can achieve the high production efficiency and is environment-friendly.
Description
Technical field
The present invention relates to a kind of continuous casting steel billet Reduction Technology, relate in particular to a kind of large Reduction Technology that improves thickness 300 ~ 420mm extra-thick plate blank center segregation and center porosity.
Background technology
Entered since the new century, because scientific and technological progress and expanding economy, the super-thick steel plate demand more than the 100mm is increasing both at home and abroad.Some iron companies successively build or plan to build super-thick steel plate production equipment.The main equipment of super-thick steel plate production comprises smelting equipment, continuous casting installation for casting and Wide and Heavy Plates rolling equipment.The used blank of rolling special heavy plate material is static ingot or continuous casting steel billet, China at present can steady production continuous casting steel billet thickness all be below the 300mm basically, be subjected to some steel grade requirement compression ratios more than or equal to the restriction of 3:1, produce the super-thick steel plate of the above thickness of 100mm, need special thick strand rolling as raw material, because center segregation and the center porosity of special thick strand are restive, generally do not adopt continuous casting steel billet as blank, but adopt static ingot to produce.The die casting process energy consumption is high, recovery rate of iron is low, environmental pollution is large, is not suitable with the social orientation of current energy-saving and emission-reduction and environmental protection.
Patent documentation application number 201010119734.3 mentions that the online doctor roll formula of a kind of conticaster depresses greatly the liquid core rolling method, to increase by a cover at solidification end to depress greatly rolling equipment, by target setting thickness, the Real-time Feedback one-tenth-value thickness 1/10 and detect oil pressure, whether the conversion roll-force transfinites, if roll-force does not transfinite, stable rolling is to rolling end; If roll-force transfinites, adjust and rejudge roll-force.Utility model patent 201020642804.9 discloses a kind of liquid-core high reduction rolling equipment for continuous casting machines, is installed in the liquid core rolling district that the slab caster level is solidified the end latter end.These two patents only relate to equipment and the liquid core rolling method that conticaster enforcement is depressed greatly, need to increase by a cover at solidification end and depress greatly rolling equipment, investment is large, the not mentioned concrete technology of depressing greatly of while, namely to how improving center segregation of casting blank and center porosity not doing and specify, especially at 300 ~ 420mm extra-thick plate blank center segregation and center porosity problem the pertinent literature report not being arranged to how solving thickness.
Center segregation and center porosity defective more and more become one of principal element that affects steel product quality.Strand only possesses good internal soundness, and namely the center segregation of strand and center porosity are slighter, and the steel plate of the above thickness of rolling 100mm is better in aspect performances such as Z-direction performance, heart section low temperature (≤-40 ℃) impacts, and flaw detection qualification rate is high.Therefore, in the special heavy plate technological process of production, the steady production of high-quality extra-thick plate blank is core link, demands urgently obtaining technically breaking through.The center segregation of continuous casting billet and center porosity all can have a negative impact to processing and the use of steel.For example for the natural gas transmission pipeline steel, segregation or loose locating that the hydrogen in the conveying gas can be diffused into tube wall crack and expand, and finally cause steel pipe to break; For the structural steel that the drilling at the sea platform is used, center segregation or loose meeting reduce its welding performance, cause steel plate to be difficult for welding, even the postwelding cracking, thereby greatly shortened the service life of steel.For this reason, begin the nineties in 20th century, developed light Reduction Technology at slab caster and (referred to that drafts is 1.0 ~ 1.5mm/m), drafts 2 ~ the 4mm(of common single fan-shaped section is defined as greatly above 5mm the present invention and depresses), its objective is near the liquid core of continuous casting billet end and exerted pressure in the continuous casting billet surface, make continuous casting billet produce the solidification shrinkage amount that certain drafts compensates strand, can eliminate or reduce like this strand the contraction internal voids that forms and the solute element that prevents the intergranular enrichment to the strand center flow, thereby play the effect that improves center segregation of casting blank and center porosity.Yet along with the continuous increase of slab thickness, the control difficulty of center segregation and center porosity is increasing, and the requirement of slab caster gently being depressed the fan-shaped section hydraulic test also is more and more higher.Center segregation and the center porosity of resolving extra-thick plate blank are the key links of producing high-quality super-thick steel plate and realizing target for energy-saving and emission-reduction, research and develop high-quality super super-thick steel plate and not only can improve China's device fabrication level, but also can greatly promote development and the breed structure readjustment thereof in the fields such as China's chemical industry, oil, machinery, power, metallurgy, nuclear energy, Aeronautics and Astronautics, ocean, have important practical significance and good economy and social benefit.
Summary of the invention
The object of the present invention is to provide a kind of extra-thick plate blank (control technology of thickness 300 ~ 420mm) center segregations and center porosity, by control molten steel overheat and casting machine pulling rate, dynamically depress greatly terminal enforcement of Slab Solidification, and in conjunction with the strong cold control that jointly realizes extra-thick plate blank center segregation and center porosity of secondary cooling water.
The present invention realizes by following technical proposal: a kind of large Reduction Technology that improves extra-thick plate blank center segregation and center porosity is characterized in that: the oil cylinder working-pressure of terminal 3 the fan-shaped section hydraulic cylinders of Slab Solidification is 1800 ~ 2500KN; According to the steel grade coagulating property, the control molten steel overheat is at 10 ~ 35 ℃, the casting machine pulling rate is between 0.6 m/min ~ 1.0m/min, controlling two cold-zone specific waters is 0.4 ~ 0.6L/kg, a fan-shaped section is implemented to depress greatly therein, drafts is 5.0 ~ 12.0mm, and other two fan-shaped section are implemented gently to depress drafts 2 ~ 3mm.
Determine the terminal point that solidifies of different casting blank thickness by method of powder actuated shot.Method of powder actuated shot is that the steel nail take sulphur as tracer is impacted into strand, analyze at the corresponding position sample of strand, be melted after the steel nail of strand runs into the liquid phase molten steel owing to be driven into, solid phase area at strand is different with the liquid phase region pattern, begin to occur alligatoring place as the boundary take nailing, measure thickness of solidified slab shell in secondary by means such as macroscopic examination, sufur printing analyses, calculate the composite solidification coefficient of strand under various working conditions and solidify terminal point according to shell thickness, calculate the liquid core length of strand, determine the fan-shaped section that needs enforcement to depress greatly.According to solidifying the end point determination result, determine the best fan-shaped section of depressing greatly of different-thickness strand enforcement.
The present invention has following advantages and effect:
(1) by increasing the oil cylinder working-pressure of terminal 3 the fan-shaped section hydraulic cylinders of Slab Solidification, drafts is increased, compensate the amount of contraction that special thick casting blank solidification end produces because of solidification shrinkage, cool off the amount of contraction of bringing in conjunction with secondary cooling water simultaneously, can effectively control the center porosity of special thick strand;
(2) need not to increase a cover and depress greatly rolling equipment, by control molten steel overheat and casting machine pulling rate, a fan-shaped section is implemented to depress greatly therein, can control easily and effectively extra-thick plate blank (center segregation of thickness 300 ~ 420mm), simple and easy to do;
(3) the invention process has been improved the extra-thick plate blank quality, can replace the special heavy plate that static ingot is produced the above thickness of 100mm.
Description of drawings
Fig. 1 is for implementing extra-thick slab casting machine frock schematic diagram of the present invention.
Fig. 2 is that the terminal fan-shaped section roller of Slab Solidification is implemented the inner liquid core of strand compression variation schematic diagram when of the present invention.
Fig. 3 is that steel grade Q345D implements macrograph of the present invention.
Fig. 4 is that steel grade Q345R implements macrograph of the present invention.
Fig. 5 is that steel grade EH36 implements macrograph of the present invention.
Among Fig. 1: the 1-crystallizer; 2-0 ~ 8 fan-shaped section; 3-the 9th fan-shaped section; 4-the 10th fan-shaped section; 5-the 11st fan-shaped section; 6-12 ~ 16 fan-shaped section.
The specific embodiment
Referring to Fig. 1, implement extra-thick slab casting machine of the present invention, formed by 0 to 16 fan-shaped section, each fan-shaped section has 7 pair of rollers and four hydraulic jacks, and oil cylinder is exerted pressure, and 7 pair of rollers directly act on casting billet surface.Wherein the oil cylinder working-pressure of 3 fan-shaped section hydraulic cylinders of the 9th fan-shaped section 3 of Slab Solidification end, the 10th fan-shaped section 4, the 11st fan-shaped section 5 is 1800 ~ 2500KN; Molten steel is through the 0 fan-shaped section cooling crust of crystallizer 1 end opening, strand to solidified shell in 1 ~ 8 fan-shaped section secondary cooling zone further cools off, the control molten steel overheat is at 10 ~ 35 ℃, the casting machine pulling rate is between 0.6 m/min ~ 1.0m/min, controlling two cold-zone specific waters is 0.4 ~ 0.6L/kg, according to the steel grade coagulating property, strand is implemented to depress greatly in the 9th fan-shaped section 3 or the 10th fan-shaped section 4 or the 11st fan-shaped section 5 one of them fan-shaped section, drafts is 5.0 ~ 12.0mm, other two fan-shaped section are implemented gently to depress drafts 2 ~ 3mm.By near the liquid core of continuous casting billet end, the continuous casting billet surface being applied the solidification shrinkage amount of depressing greatly to compensate strand, the drafts that acts on the continuous casting billet is 9.0 ~ 18.0mm, can eliminate or reduce like this strand the contraction internal voids that forms and the solute element that prevents the intergranular enrichment to the strand center flow, thereby play the effect that improves center segregation of casting blank and center porosity.Further cool off in 12 ~ 16 fan-shaped section 6 subsequently, obtain high-quality extra-thick plate blank.
Referring to Fig. 2, by near the liquid core of continuous casting billet end, the continuous casting billet surface being applied depressing greatly of 5.0 ~ 12.0mm, add gently depressing of other adjacent fan-shaped section, the heavy reduction that makes continuous casting billet produce 9.0 ~ 18.0mm compensates the solidification shrinkage amount of strand, eliminate or reduce strand the contraction internal voids that forms and the solute element that prevents the intergranular enrichment to the strand center flow, thereby play the effect that improves center segregation of casting blank and center porosity.
Embodiment 1:Steel grade Q345D, slab thickness 300mm, width 2270mm detects 35 ℃ of the degrees of superheat, pulling rate 1.0m/min, two cold-zone specific waters are 0.4L/kg.Implementing to depress greatly is the 9th fan-shaped section 3, and drafts is 5.0mm, and the 10th fan-shaped section 4 and the 11st fan-shaped section 5 drafts are 3mm, and the 9th fan-shaped section 3 oil cylinder working-pressures are 1800KN.
Implementation result: strand detects through low power, and center segregation is C1.0, and center porosity is C1.0, occurs without middle crack.Macrograph is seen Fig. 3.
Embodiment 2:Steel grade Q345R, slab thickness 360mm, width 2070mm detects 25 ℃ of the degrees of superheat, pulling rate 0.8m/min, two cold-zone specific waters are 0.5L/kg.Implementing to depress greatly is the 11st fan-shaped section 5, and drafts is 9mm, and the 9th fan-shaped section and the 10th fan-shaped section drafts are 2.5mm, and the 11st fan-shaped section oil cylinder working-pressure is 2000KN.
Implementation result: strand detects through low power, and center segregation is C0.5, and center porosity is C0.5, occurs without middle crack.Macrograph is seen Fig. 4.
Embodiment 3:Steel grade EH36, slab thickness 420mm, width 2070mm detects 10 ℃ of the degrees of superheat, pulling rate 0.6m/min, two cold-zone specific waters are 0.6L/kg.Implementing to depress greatly is the 10th fan-shaped section 5, and drafts is 12mm, and the 9th fan-shaped section 3 and the 10th fan-shaped section 4 drafts are 2mm, and the 11st fan-shaped section 5 pressure are 2500KN.
Implementation result: strand detects through low power, and center segregation is C0.5, and center porosity is C0.5, occurs without middle crack.Macrograph is seen Fig. 5.
Claims (1)
1. large Reduction Technology that improves extra-thick plate blank center segregation and center porosity is characterized in that: the oil cylinder working-pressure of terminal 3 the fan-shaped section hydraulic cylinders of Slab Solidification is 1800 ~ 2500KN; According to the steel grade coagulating property, the control molten steel overheat is at 10 ~ 35 ℃, the casting machine pulling rate is between 0.6 m/min ~ 1.0m/min, controlling two cold-zone specific waters is 0.4 ~ 0.6L/kg, a fan-shaped section is implemented to depress greatly therein, drafts is 5.0 ~ 12.0mm, and other two fan-shaped section are implemented gently to depress drafts 2 ~ 3mm.
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| CN103361552A (en) * | 2012-03-30 | 2013-10-23 | 鞍钢股份有限公司 | V-N microalloyed 460MPa thick plate and manufacturing method thereof |
| CN103464711A (en) * | 2013-08-29 | 2013-12-25 | 鞍钢股份有限公司 | Method for solving internal segregation of bloom |
| CN103611903A (en) * | 2013-12-11 | 2014-03-05 | 首钢总公司 | Continuous casting manufacturing process of ultra-thick slabs for hydropower station pressure vessel steel |
| CN104001891A (en) * | 2014-06-17 | 2014-08-27 | 中冶连铸技术工程有限责任公司 | Online control method for continuous casting of small square billet through dynamic soft press and heavy press |
| CN104057048A (en) * | 2014-03-27 | 2014-09-24 | 中国重型机械研究院股份公司 | Fan-shaped segment structure and method for realizing continuous casting, solidification and tail end composite pressing of super-thick plate |
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| CN105234365A (en) * | 2015-11-10 | 2016-01-13 | 攀钢集团攀枝花钢铁研究院有限公司 | Casting method for heavy rail steel casting blank |
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| CN104493121A (en) * | 2014-11-28 | 2015-04-08 | 东北大学 | Online detection method for solidified bottom end position in bloom continuous casting production process |
| CN107107178B (en) * | 2015-01-15 | 2019-11-05 | 日本制铁株式会社 | Continuously casting slab and its manufacturing method and manufacturing device, the manufacturing method of thick steel plate and manufacturing device |
| CN107107178A (en) * | 2015-01-15 | 2017-08-29 | 新日铁住金株式会社 | Continuously casting strand and its manufacture method and manufacture device, the manufacture method of steel plate and manufacture device |
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| CN108856668B (en) * | 2018-07-19 | 2020-11-13 | 首钢集团有限公司 | Control method for continuous casting billet center segregation |
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| CN113500172B (en) * | 2021-06-23 | 2024-06-04 | 中冶南方连铸技术工程有限责任公司 | Method for determining optimal position under single-roller heavy pressure |
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