CN102534368B - Low-alloy high-strength wide and thin steel plate - Google Patents
Low-alloy high-strength wide and thin steel plate Download PDFInfo
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- CN102534368B CN102534368B CN201110432477.3A CN201110432477A CN102534368B CN 102534368 B CN102534368 B CN 102534368B CN 201110432477 A CN201110432477 A CN 201110432477A CN 102534368 B CN102534368 B CN 102534368B
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Abstract
The invention relates to the technical field of steel, and particularly discloses a low-alloy high-strength wide and thin steel plate and a production method of the steel plate. The low-alloy high-strength wide and thin steel plate consists of the following chemical components in percentage by weight: not more than 0.18% of C, not more than 0.55% of Si, 1.4-1.6% of Mn, not more than 0.030% of P, not more than 0.030% of S, 0.34-0.36% of V, and the balance of Fe and inevitable impurities. The steel plate is prepared by a billet heating step, a controlled rolling process step, and a cooling and straightening step. According to the invention, the mechanical properties of the steel plate satisfy technical requirements, and in particular the low-temperature impact toughness is above 100J; a proper amount of V is added, and a controlled rolling process of four-roller high-pressure water pumping assistant cooling and once rolling and a reasonable heating system are adopted, thus the obtained steel plate can satisfy customer requirements; and in addition, the production method has the advantages of low energy consumption, simple production working procedure and short production period, and has considerable economic benefits.
Description
Technical field
The present invention relates to iron and steel technical field, be specifically related to the wide steel sheet of a kind of low-alloy high-strength and production method thereof.
Background technology
Along with the increase of the market requirement, the wide steel sheet quantity of producing is at present increasing gradually.Because this type of steel plate is not only wide but also thin, therefore, when producing this type of steel plate, if the rolling load of the milling train using is lower, be just difficult to control the plate shape of finished steel plate, and then the use properties of the wide steel sheet product that directly impact is produced.The milling train great majority that China Plate Production enterprise is used are at present equipments seventies, its rolling load only has 4200 tons, can not meet the requirement to rolling load of milling train that wide steel sheet uses in producing, therefore at present because the too low problem of mill rolling force has caused more input outside the plan and steel plate waste product ，Gei enterprise to cause larger financial loss to Plate Production enterprise.Therefore, current top priority is exactly the production method of optimizing wide steel-sheet composition proportion and improving steel plate, utilizes existing milling train to produce to meet the wide steel sheet of service requirements.
Summary of the invention
The object of the present invention is to provide the wide steel sheet of a kind of low-alloy high-strength.
Meanwhile, the present invention also aims to provide a kind of low-alloy high-strength wide steel-sheet production method.
In order to realize above object, the technical solution adopted in the present invention is: the wide steel sheet of a kind of low-alloy high-strength, chemical composition by following weight percentage forms: C≤0.18%, Si≤0.55%, Mn 1.4-1.6%, P≤0.030%, S≤0.030%, V 0.34-0.36%, surplus is Fe and inevitable impurity.
Further, the wide steel sheet of described low-alloy high-strength is comprised of the chemical composition of following weight percentage: C 0.14-0.17%, Si 0.30-0.40%, Mn 1.4-1.6%, P≤0.030%, S≤0.030%, V 0.34-0.36%, surplus is Fe and inevitable impurity.
Preferably, the wide steel sheet of described low-alloy high-strength is comprised of the chemical composition of following weight percentage: C 0.14-0.17%, Si 0.30%, Mn 1.43%, P≤0.030%, S≤0.030%, V 0.35%, surplus is Fe and inevitable impurity.
The wide steel-sheet production method of a kind of low-alloy high-strength, its technical process is: electrosmelting → LF refining → VD vacuum-treat → continuous casting → cleaning → heating → controlled rolling → control cold → turnover panel inspection → cutting, inspection by sampling → warehouse-in, specifically comprises the following steps:
Process for making: molten steel, first through electrosmelting, guarantees slag free tapping, adds reductor pre-deoxidation with molten steel.Tapping temperature is at 1560-1600 ℃; Send into subsequently the refining of LF refining furnace, strengthening deoxidation dynamics, guarantees white slag hold-time 20-40min, effectively refining total time 40-60min; Finally VD stove vacuum-treat again, following hold-time >=15 minute of vacuum-treat 66Pa;
Heating steel billet step: steel billet is put into process furnace and heat, during heating, should keep the V in steel billet fully to dissolve in steel billet austenite, the heating zone temperature of process furnace is 1240-1260 ℃, soaking zone temperature is 1220-1240 ℃, be 8-10min/cm total heat-up time of heating zone and soaking zone, to guarantee steel billet uniform well-burnt;
Controlled rolling processing step: steel plate adopts with the four roller high pressure waters method that auxiliary temperature-reducing once rolls into of fetching water, and first adopts large reduction in pass 25-30mm, and percentage pass reduction 12-25% rolls 20-22mm by steel billet thickness.Adopt heavy reduction rolling can impel austenite crystal to obtain refinement in repeated deformation recrystallization process, beating afterwards high pressure water lowers the temperature to steel billet, open rolling when steel billet temperature drops to below 950 ℃, in the operation of rolling, continue to beat high pressure water steel billet is lowered the temperature, finishing temperature is 830-880 ℃; After steel plate is cooled to 740-780 ℃, enter in time afterwards straightener and align, object is to eliminate the unrelieved stress of final steel intralamellar part, obtains the wide steel sheet product of low-alloy high-strength.On steel plate, after cold bed, keep from start to finish straight.
The plate shape running in the performance requiring according to wide steel sheet and the actual operation of rolling of steel plate is controlled difficult problem, the invention provides the wide steel sheet of a kind of low-alloy high-strength.In the wide steel sheet of low-alloy high-strength provided by the invention, the weight percent content of V is 0.34-0.36%.For guaranteeing that wide steel sheet has good toughness, C controls as C≤0.18%, and Mn is controlled at 1.4-1.6%.The wide steel sheet of low-alloy high-strength provided by the invention utilizes the principle of design of low C and microalloying,, on the basis of C-Mn solution strengthening, uses the means of refined crystalline strengthening, precipitation strength, has obtained meeting service requirements, well behaved wide steel sheet.
The wide steel-sheet production method of low-alloy high-strength provided by the invention comprises heating steel billet step, controlled rolling processing step and last cooling and aligning step.The object of heating steel billet is to improve the plasticity of steel plate, reduces the resistance to deformation of steel plate, optimizes the original structure structure of blank, under existing installation ability condition, can meet rolling requirement.Should be by rational heating cycle by the reasonable control of Heating temperature and heat-up time be made to steel billet temperature uniformity as far as possible when heating steel billet, when rolling, steel billet could be out of shape evenly like this, deformability is fully permeated, and is also one of prerequisite guaranteeing steel-plate shape.V only just can be solidly soluted in austenite in heat-processed, just can play the effect of crystal grain thinning and precipitation strength, while therefore heating, should keep V fully to dissolve in austenite, therefore need to guarantee 1260 ℃ of heating zone top temperatures, guarantee time inside furnace 8-10min/cm, guarantee steel billet uniform well-burnt.In controlled rolling processing step, for guaranteeing that steel plate has good low-temperature impact toughness, in conjunction with production practice, when rolling, adopt with the four roller high pressure waters method that auxiliary temperature-reducing once rolls into of fetching water, first adopt heavy reduction that steel billet thickness is rolled to 20-22mm, adopt heavy reduction rolling can impel austenite crystal to obtain refinement in repeated deformation recrystallization process, beating afterwards high pressure water lowers the temperature to steel billet, open rolling when steel billet temperature drops to below 950 ℃, in the operation of rolling, continue to beat high pressure water steel billet is lowered the temperature, finishing temperature is 830-880 ℃.
By adding appropriate V microalloy element and utilizing the controlled rolling technique once rolling into, and control heating steel billet system well, guarantee steel billet time inside furnace, the performance surplus capacity of the steel plate making is very large, be enough to meet customer requirements, Zhe Geikuan steel sheet manufacturing enterprise rolling wide and thin steel plate provides Technical Reference, to improving rolling rhythm and switchboard shape, has created good condition.In addition, also save energy consumption, simplified production process, reduced the generation of amount outside the plan, reduced the handling of the middle operation of steel plate and shifted, shortened the production cycle, there is considerable economic benefit.
The wide steel-sheet plate of low-alloy high-strength provided by the invention shape is good, and the mechanical property of steel plate all can meet technical requirements, and especially low-temperature impact toughness is all more than 100J.
Embodiment
Embodiment 1
The present embodiment is the wide steel-sheet specific embodiment of low-alloy high-strength, this steel plate is comprised of the chemical composition of following weight percentage: C 0.14%, Si 0.55%, Mn 1.6%, P 0.014%, S 0.030%, V 0.36%, surplus is Fe and inevitable impurity.
The wide steel-sheet production method of the present embodiment low-alloy high-strength, comprises the following steps:
Process for making: molten steel, first through electrosmelting, guarantees slag free tapping, adds reductor pre-deoxidation with molten steel; Tapping temperature is at 1560-1600 ℃; Send into subsequently the refining of LF refining furnace, strengthening deoxidation dynamics, guarantees white slag hold-time 40min, effectively refining total time 60min; Finally VD stove vacuum-treat again, following hold-time >=15 minute of vacuum-treat 66Pa;
Heating steel billet step: steel billet is put into process furnace and heat, during heating, should keep the V in steel billet fully to dissolve in steel billet austenite, the heating zone temperature of process furnace is 1240-1260 ℃, soaking zone temperature is 1220-1240 ℃, be 8min/cm total heat-up time of heating zone and soaking zone, to guarantee steel billet uniform well-burnt;
Controlled rolling processing step: steel plate adopts with the four roller high pressure waters method that auxiliary temperature-reducing once rolls into of fetching water, and first adopts large reduction in pass 30mm, and percentage pass reduction 25% rolls 22mm by steel billet thickness; Adopt heavy reduction rolling can impel austenite crystal to obtain refinement in repeated deformation recrystallization process, beating afterwards high pressure water lowers the temperature to steel billet, open rolling when steel billet temperature drops to below 950 ℃, continues to beat high pressure water steel billet is lowered the temperature in the operation of rolling, finishing temperature is 880 ℃; After steel plate is cooled to 740 ℃, entering in time afterwards straightener aligns, object is to eliminate the unrelieved stress of final steel intralamellar part, obtain the wide steel sheet product of low-alloy high-strength, keep from start to finish straight on steel plate after cold bed, product specification is 12*3430*7950.
Embodiment 2
The present embodiment is the wide steel-sheet specific embodiment of low-alloy high-strength, this steel plate is comprised of the chemical composition of following weight percentage: C 0.18%, Si 0.40%, Mn 1.4%, P 0.011%, S 0.030%, V 0.34%, surplus is Fe and inevitable impurity.
The wide steel-sheet production method of the present embodiment low-alloy high-strength, comprises the following steps:
Process for making: molten steel, first through electrosmelting, guarantees slag free tapping, adds reductor pre-deoxidation with molten steel; Tapping temperature is at 1560-1600 ℃; Send into subsequently the refining of LF refining furnace, strengthening deoxidation dynamics, guarantees white slag hold-time 20min, effectively refining total time 40min; Finally VD stove vacuum-treat again, following hold-time >=15 minute of vacuum-treat 66Pa;
Heating steel billet step: steel billet is put into process furnace and heat, during heating, should keep the V in steel billet fully to dissolve in steel billet austenite, the heating zone temperature of process furnace is 1240-1260 ℃, soaking zone temperature is 1220-1240 ℃, be 10min/cm total heat-up time of heating zone and soaking zone, to guarantee steel billet uniform well-burnt;
Controlled rolling processing step: steel plate adopts with the four roller high pressure waters method that auxiliary temperature-reducing once rolls into of fetching water, and first adopts large reduction in pass 25mm, and percentage pass reduction 12% rolls 20mm by steel billet thickness; Adopt heavy reduction rolling can impel austenite crystal to obtain refinement in repeated deformation recrystallization process, beating afterwards high pressure water lowers the temperature to steel billet, open rolling when steel billet temperature drops to below 950 ℃, continues to beat high pressure water steel billet is lowered the temperature in the operation of rolling, finishing temperature is 830 ℃; After steel plate is cooled to 780 ℃, entering in time afterwards straightener aligns, object is to eliminate the unrelieved stress of final steel intralamellar part, obtain the wide steel sheet product of low-alloy high-strength, keep from start to finish straight on steel plate after cold bed, product specification is 12*3450*8050.
Embodiment 3
The present embodiment is the wide steel-sheet specific embodiment of low-alloy high-strength, this steel plate is comprised of the chemical composition of following weight percentage: C 0.17%, Si 0.30%, Mn 1.43%, P 0.012%, S 0.030%, V 0.35%, surplus is Fe and inevitable impurity.
The wide steel-sheet production method of the present embodiment low-alloy high-strength, comprises the following steps:
Process for making: molten steel, first through electrosmelting, guarantees slag free tapping, adds reductor pre-deoxidation with molten steel; Tapping temperature is at 1560-1600 ℃; Send into subsequently the refining of LF refining furnace, strengthening deoxidation dynamics, guarantees white slag hold-time 20min, effectively refining total time 40min; Finally VD stove vacuum-treat again, following hold-time >=15 minute of vacuum-treat 66Pa;
Heating steel billet step: steel billet is put into process furnace and heat, during heating, should keep the V in steel billet fully to dissolve in steel billet austenite, the heating zone temperature of process furnace is 1240-1260 ℃, soaking zone temperature is 1220-1240 ℃, be 10min/cm total heat-up time of heating zone and soaking zone, to guarantee steel billet uniform well-burnt;
Controlled rolling processing step: steel plate adopts with the four roller high pressure waters method that auxiliary temperature-reducing once rolls into of fetching water, and first adopts large reduction in pass 25mm, and percentage pass reduction 12% rolls 20mm by steel billet thickness; Adopt heavy reduction rolling can impel austenite crystal to obtain refinement in repeated deformation recrystallization process, beating afterwards high pressure water lowers the temperature to steel billet, open rolling when steel billet temperature drops to below 950 ℃, continues to beat high pressure water steel billet is lowered the temperature in the operation of rolling, finishing temperature is 880 ℃; After steel plate is cooled to 740 ℃, entering in time afterwards straightener aligns, object is to eliminate the unrelieved stress of final steel intralamellar part, obtain the wide steel sheet product of low-alloy high-strength, keep from start to finish straight on steel plate after cold bed, product specification is 12*3500*8050.
The wide steel-sheet mechanical property of low-alloy high-strength that embodiment 1, embodiment 2, embodiment 3 provide is shown in Table 1.
The mechanical property of table 1 embodiment 1-3 steel plate
Claims (3)
1. the wide steel sheet of low-alloy high-strength, it is characterized in that, this steel plate is comprised of the chemical composition of following weight percentage: C≤0.18%, Si≤0.55%, Mn1.4-1.6%, P≤0.030%, S≤0.030%, V0.34-0.36%, and surplus is Fe and inevitable impurity;
The wide steel-sheet production method of described low-alloy high-strength, comprises the following steps:
(1) steel-making step: molten steel, first through electrosmelting, guarantees slag free tapping, adds reductor pre-deoxidation with molten steel; Tapping temperature is at 1560-1600 ℃; Send into subsequently the refining of LF refining furnace, guarantee white slag hold-time 20-40min, effectively refining total time 40-60min; Finally VD stove vacuum-treat again, following hold-time >=15 minute of vacuum-treat 66Pa;
(2) heating steel billet step: steel billet is put into process furnace and heat, the heating zone temperature of process furnace is 1240-1260 ℃, and soaking zone temperature is 1220-1240 ℃, and be 8-10min/cm total heat-up time of heating zone and soaking zone;
(3) controlled rolling processing step: first adopt large reduction in pass 25～30mm, percentage pass reduction 12～25% rolls 20-22mm by steel billet thickness, beating afterwards high pressure water lowers the temperature to steel billet, open rolling when steel billet temperature drops to below 950 ℃, in the operation of rolling, continue to beat high pressure water steel billet is lowered the temperature, finishing temperature is 830-880 ℃; Through being cooled to 740-780 ℃, aligning, obtain the wide steel sheet product of low-alloy high-strength afterwards.
2. the wide steel sheet of low-alloy high-strength according to claim 1, it is characterized in that, described steel plate is comprised of the chemical composition of following weight percentage: C0.14-0.17%, Si0.30-0.40%, Mn1.4-1.6%, P≤0.030%, S≤0.030%, V0.34-0.36%, surplus is Fe and inevitable impurity.
3. the wide steel sheet of low-alloy high-strength according to claim 1 and 2, it is characterized in that, described steel plate is comprised of the chemical composition of following weight percentage: C0.14-0.17%, Si0.30%, Mn1.43%, P≤0.030%, S≤0.030%, V0.35%, surplus is Fe and inevitable impurity.
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| CN1644746A (en) * | 2005-01-17 | 2005-07-27 | 上海大学 | Low carbon silicon cold rolling phase variable plastic steel and production thereof |
| CN101006192A (en) * | 2004-08-24 | 2007-07-25 | 新日本制铁株式会社 | High tensile strength steel material having excellent weldability and toughness and >=550 mpa class tensile strength, and manufacturing method therefor |
| CN101096735A (en) * | 2006-06-26 | 2008-01-02 | 舞阳钢铁有限责任公司 | Easy-weld hardening high-strength steel plate and production method thereof |
| CN101613827A (en) * | 2008-06-27 | 2009-12-30 | 鞍钢股份有限公司 | A kind of high-performance cold rolled phase transformation plasticity steel and preparation method thereof |
| CN101932746A (en) * | 2008-01-31 | 2010-12-29 | 杰富意钢铁株式会社 | High-strength steel sheet and process for production thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101006192A (en) * | 2004-08-24 | 2007-07-25 | 新日本制铁株式会社 | High tensile strength steel material having excellent weldability and toughness and >=550 mpa class tensile strength, and manufacturing method therefor |
| CN1644746A (en) * | 2005-01-17 | 2005-07-27 | 上海大学 | Low carbon silicon cold rolling phase variable plastic steel and production thereof |
| CN101096735A (en) * | 2006-06-26 | 2008-01-02 | 舞阳钢铁有限责任公司 | Easy-weld hardening high-strength steel plate and production method thereof |
| CN101932746A (en) * | 2008-01-31 | 2010-12-29 | 杰富意钢铁株式会社 | High-strength steel sheet and process for production thereof |
| CN101613827A (en) * | 2008-06-27 | 2009-12-30 | 鞍钢股份有限公司 | A kind of high-performance cold rolled phase transformation plasticity steel and preparation method thereof |
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