CN102601114B - Production method for 100-200 mm thick steel plates meeting ultrasonic flaw detection level I - Google Patents
Production method for 100-200 mm thick steel plates meeting ultrasonic flaw detection level I Download PDFInfo
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- CN102601114B CN102601114B CN201210048909.5A CN201210048909A CN102601114B CN 102601114 B CN102601114 B CN 102601114B CN 201210048909 A CN201210048909 A CN 201210048909A CN 102601114 B CN102601114 B CN 102601114B
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Abstract
The invention discloses a production method for 100-200 mm thick steel plates meeting ultrasonic flaw detection level I, which includes steps of (1), filling steel ingots into a furnace to heat, reheating the steel ingots, cogging and rolling the heated steel ingots to obtain cogged steel ingots which are 2-4 times as thick as the finished steel plates; (2) heating the cogged steel ingots, performing a second stage controlled rolling to obtain the semi-finished steel plates which are as thick as the finished steel plates; (3) water cooling the semi-finished steel plates, and then stacking the semi-finished steel plates for slow cooling to obtain the finished steel plates. By the method, the finished steel plates are rolled to the required thickness in two working procedures, problems of penetration deformation of the inside of the finished steel plates caused by fast temperature drop in existing once rolling can be avoided, and the finished steel plates is compact inside and meet demands of ultrasonic flaw detection standards of GB/T 2970-2004 I level steel plates or JB/T 4730-2005 I level steel plates.
Description
Technical field
The present invention relates to steel plate technical field, being specifically related to a kind of thickness is the production method that 100-200mm, internal quality of steel plate meet the steel plate of ultrasonic examination GB/T 2970I level or the requirement of JB/T 4730.3I level.
Background technology
While producing 100-200mm steel plate at present, generally all adopt rolling mill practice of Large Flat steel ingot, because temperature drop in the operation of rolling is very fast, therefore the roll-force of milling train is had relatively high expectations, for the little milling train of roll-force, in the operation of rolling, because penetration is poor, the internal quality of steel plate rolling out is difficult to meet the requirement of higher non-destructive testing standard, as the requirement of non-destructive testing standard GB/T 2970I level or JB/T 4730.3I level.If replacing large-sized rolling mills, costs a lot of money, production cost increases.
Summary of the invention
The object of the present invention is to provide the production method that a kind of 100-200mm is thick, ultrasonic examination meets the steel plate of I level requirement.
In order to realize above object, the technical solution adopted in the present invention is: a kind of 100-200mm is thick, the production method of ultrasonic examination I grade steel plate, comprises the following steps:
(1) molten steel casting of having smelted is become to steel ingot, then steel ingot band temperature cleaning, cleaning temperature is not less than 150 ℃, the stewing steel of shove charge after cleaning, then adopt low speed to burn steel, 1000 ℃ of following programming rates are not more than 120 ℃/h, and maximum heating temperature is 1250 ± 10 ℃, is incubated afterwards 300-500 minute; Then rolling-cogging, rolling temperature is 1000-1150 ℃, is rolled to the 2-4 of finished steel plate thickness doubly, obtains cogging material;
(2) heat described cogging material, 1000 ℃ of following programming rates are not more than 120 ℃/h, maximum heating temperature is 1250 ± 10 ℃, be incubated afterwards 300-500 minute, then adopt controlled rolling process to carry out the rolling of II stage control, first stage rolling temperature 950-1150 ℃, be rolled to finished steel plate thickness+60mm, second stage rolling temperature is 850-900 ℃, is rolled to finished steel plate thickness, obtains semi-finished product steel plate;
(3) described semi-finished product steel plate carries out water-cooled, and red temperature is 680-720 ℃, carries out afterwards stacking slow cooling again, and the stacking time is not less than 48 hours, makes finished steel plate, and finished steel plate thickness is 100-200mm.
Further, in step (1), casting adopts die casting method to cast, and the degree of superheat is 30-40 ℃, and casting rate is steel ingot body 14-18 minute, cap mouth 4-7 minute, and the thickness of the steel ingot that casting obtains is 450-980mm.Casting will be guaranteed the degree of superheat and the casting rate that Various Seasonal is suitable, can alleviate segregation and loose for large thickness During Ingot Solidification, obtains good raw material cast slab.
While adopting controlled rolling process to carry out the rolling of II stage control in step (2), the single pass drafts of first stage rolling, second stage rolling is 25-35mm.
When the middle stacking slow cooling of step (3), guarantee that steel plate rolls rear timely stacking, when stacking, surface temperature is not less than 400 ℃.
Smelting molten steel process is: molten steel is first through electric furnace smelting, send into afterwards the refining of LF stove adjusting component, guarantee that LF refining cycle is more than 50 minutes, deoxidation is good, when liquid steel temperature reaches 1560-1580 ℃, proceed to vacuum degassing furnace (VD stove) application of vacuum, before application of vacuum, add Al line and slag material.The refining cycle control that smelting molten steel technological requirement is strict and suitable deoxidation system, object is to guarantee to obtain pure, uniform steel.
The production method that 100-200mm provided by the invention is thick, ultrasonic examination meets the steel plate of I level requirement is applicable to the milling train that draught pressure is little, divide two operations to be rolled, first by the method for rolling, raw material cast slab is carried out to cogging, be rolled to the 2-4 of finished steel plate thickness doubly, obtain cogging material; And then heating cogging material, adopt afterwards controlled rolling process to carry out the rolling of II stage control, be rolled to finished steel plate thickness, obtain semi-finished product steel plate, double finished steel plate carries out water-cooled, stacking slow cooling processing afterwards, makes finished steel plate.The production method of steel plate provided by the invention divides two operations raw material cast slab to be rolled down to the thickness of finished steel plate, the coarse grains inequality, the toughness that have solved mill milling insufficient pressure and cause lower phenomenon, the too fast finished product steel plate internal penetration problem on deformation causing of having avoided lowering the temperature in a current rolling mill practice, the finished steel plate internal soundness densification making, can meet the requirement of ultrasonic examination standard GB/T 2970-2004I level or JB/T 4730-2005I grade steel plate, increase the thickness specification that the little milling train of roll-force can be produced steel plate.Then by sufficient stacking slow cooling, make cardiac stress in steel plate be able to slow release, avoided finished product steel plate to produce stress cracking.
The steel plate that the production method that adopt that 100-200mm provided by the invention is thick, ultrasonic examination meets the steel plate that I level requires makes has the following advantages: (1) steel plate thickness directional performance obviously improves, and can meet Z35 standard; (2) steel plate composition is even, internal soundness is finer and close, and the metallurgical level of steel plate is higher, and internal soundness can meet the requirement of ultrasonic examination standard GB/T 2970-2004I level or JB/T 4730-2005I grade steel plate; (3) steel plate maximum ga(u)ge can reach 200mm.The steel plate that the alternative part electroslag remelting process of steel plate that adopts the inventive method to produce is produced, is suitable for high-end market user.
The specific embodiment
Embodiment 1
Produce steel grade: Q345B, specification: 200mm × 2400mm × 6000mm, non-destructive testing standard: GB/T2970-2004I level.
The production method of this steel, comprises the following steps:
(1) molten steel is first through electric furnace smelting, send into afterwards the refining of LF stove adjusting component, LF refining cycle 65 minutes, deoxidation is good, when liquid steel temperature reaches 1560 ℃, proceed to vacuum degassing furnace (VD stove) application of vacuum, application of vacuum process keeps 20 minutes at 66Pa, adds Al line and slag material before application of vacuum; The molten steel casting of having smelted is become to steel ingot, and casting adopts die casting method to carry out, and the degree of superheat is 36 ℃, and casting rate is steel ingot body 18 minutes, cap mouth 4 minutes, and the thickness of the steel ingot that casting obtains is 650mm, weighs 33 tons; Then steel ingot band temperature cleaning, 160 ℃ of cleaning temperature, after cleaning, the stewing steel of shove charge, then adopts low speed to burn steel, 1000 ℃ of following 110 ℃/h of programming rate, maximum heating temperature is 1260 ℃, is incubated afterwards 500 minutes; Then rolling-cogging, rolling temperature is 1000 ℃, is rolled to 550mm, obtains cogging material;
(2) heating cogging material, 1000 ℃ of following 115 ℃/h of programming rate, maximum heating temperature is 1250 ℃, is incubated afterwards 500 minutes, then adopts controlled rolling process to carry out the rolling of II stage control, 1150 ℃ of first stage rolling temperatures, be rolled to 260mm, second stage rolling temperature is 900 ℃, is rolled to finished steel plate thickness 200mm, obtain semi-finished product steel plate, the single pass drafts of wherein first stage rolling, second stage rolling is 35mm;
(3) semi-finished product steel plate carries out water-cooled, and red temperature is 680 ℃, carries out afterwards stacking slow cooling again, 58 hours stacking time, make finished steel plate, and finished steel plate thickness is 200mm.
After the finished steel plate de-stacking making, carry out ultrasonic examination, internal quality of steel plate has reached the flaw detection I level of GB/T2970-2004 standard-required, thickness direction 1/2 place's Z-direction service check result: 38%, 40%, 45%, meet the requirement of standard Z35.
Embodiment 2
Produce steel grade: SA516Gr70, specification: 180mm × 2000mm × 8000mm, non-destructive testing standard: JB/T 4730-2005I level.
The production method of this steel, comprises the following steps:
(1) molten steel is first through electric furnace smelting, send into afterwards the refining of LF stove adjusting component, LF refining cycle 55 minutes, deoxidation is good, when liquid steel temperature reaches 1580 ℃, proceed to vacuum degassing furnace (VD stove) application of vacuum, application of vacuum process keeps 20 minutes at 66Pa, adds Al line and slag material before application of vacuum; The molten steel casting of having smelted is become to steel ingot, and casting adopts die casting method to carry out, and the degree of superheat is 38 ℃, and casting rate is steel ingot body 14 minutes, cap mouth 7 minutes, and the thickness of the steel ingot that casting obtains is 680mm, weighs 35.25 tons; Then steel ingot band temperature cleaning, 155 ℃ of cleaning temperature, after cleaning, the stewing steel of shove charge, then adopts low speed to burn steel, 1000 ℃ of following 115 ℃/h of programming rate, maximum heating temperature is 1240 ℃, is incubated afterwards 300 minutes; Then rolling-cogging, rolling temperature is 1150 ℃, is rolled to 600mm, obtains cogging material;
(2) heating cogging material, 1000 ℃ of following 110 ℃/h of programming rate, maximum heating temperature is 1260 ℃, is incubated afterwards 300 minutes, then adopts controlled rolling process to carry out the rolling of II stage control, 950 ℃ of first stage rolling temperatures, be rolled to 240mm, second stage rolling temperature is 850 ℃, is rolled to finished steel plate thickness 180mm, obtain semi-finished product steel plate, the single pass drafts of wherein first stage rolling, second stage rolling is 25mm;
(3) semi-finished product steel plate carries out water-cooled, and red temperature is 700 ℃, carries out afterwards stacking slow cooling again, 60 hours stacking time, make finished steel plate, and finished steel plate thickness is 180mm.
After the finished steel plate de-stacking making, carry out ultrasonic examination, internal quality of steel plate has reached the flaw detection I level of JB/T4730-2005 standard-required, thickness direction 1/2 place's Z-direction service check result: 41%, 44%, 40%, meet the requirement of standard Z35.
Embodiment 3
Produce steel grade: Q345R, specification: 150mm × 2300mm × 7500mm, non-destructive testing standard: JB/T4730-2005I level.
The production method of this steel, comprises the following steps:
(1) molten steel is first through electric furnace smelting, send into afterwards the refining of LF stove adjusting component, LF refining cycle 60 minutes, deoxidation is good, when liquid steel temperature reaches 1560 ℃, proceed to vacuum degassing furnace (VD stove) application of vacuum, application of vacuum process keeps 20 minutes at 66Pa, adds Al line and slag material before application of vacuum; The molten steel casting of having smelted is become to steel ingot, and casting adopts die casting method to carry out, and the degree of superheat is 36 ℃, and casting rate is steel ingot body 14 minutes, cap mouth 4 minutes, and the thickness of the steel ingot that casting obtains is 500mm, weighs 21 tons; Then steel ingot band temperature cleaning, 165 ℃ of cleaning temperature, after cleaning, the stewing steel of shove charge, then adopts low speed to burn steel, 1000 ℃ of following 105 ℃/h of programming rate, maximum heating temperature is 1250 ℃, is incubated afterwards 350 minutes; Then rolling-cogging, rolling temperature is 1100 ℃, is rolled to 450mm, obtains cogging material;
(2) heating cogging material, 1000 ℃ of following 110 ℃/h of programming rate, maximum heating temperature is 1250 ℃, is incubated afterwards 350 minutes, then adopts controlled rolling process to carry out the rolling of II stage control, 1000 ℃ of first stage rolling temperatures, be rolled to 210mm, second stage rolling temperature is 900 ℃, is rolled to finished steel plate thickness 150mm, obtain semi-finished product steel plate, the single pass drafts of wherein first stage rolling, second stage rolling is 30mm;
(3) semi-finished product steel plate carries out water-cooled, and red temperature is 720 ℃, carries out afterwards stacking slow cooling again, 48 hours stacking time, make finished steel plate, and finished steel plate thickness is 150mm.
After the finished steel plate de-stacking making, carry out ultrasonic examination, internal quality of steel plate has reached the flaw detection I level of JB/T4730-2005 standard-required, thickness direction 1/2 place's Z-direction service check result: 56%, 51%, 55%, meet the requirement of standard Z35.
Embodiment 4
Produce steel grade: Q345E, specification: 100mm × 2500mm × 8500mm, non-destructive testing standard: GB/T2970-2004I level.
The production method of this steel, comprises the following steps:
(1) molten steel is first through electric furnace smelting, send into afterwards the refining of LF stove adjusting component, LF refining cycle 55 minutes, deoxidation is good, when liquid steel temperature reaches 1580 ℃, proceed to vacuum degassing furnace (VD stove) application of vacuum, application of vacuum process keeps 20 minutes at 66Pa, adds Al line and slag material before application of vacuum; The molten steel casting of having smelted is become to steel ingot, and casting adopts die casting method to carry out, and the degree of superheat is 35 ℃, and casting rate is steel ingot body 18 minutes, cap mouth 7 minutes, and the thickness of the steel ingot that casting obtains is 450mm, weighs 23 tons; Then steel ingot band temperature cleaning, 155 ℃ of cleaning temperature, after cleaning, the stewing steel of shove charge, then adopts low speed to burn steel, 1000 ℃ of following 115 ℃/h of programming rate, maximum heating temperature is 1240 ℃, is incubated afterwards 400 minutes; Then rolling-cogging, rolling temperature is 1150 ℃, is rolled to 300mm, obtains cogging material;
(2) heating cogging material, 1000 ℃ of following 110 ℃/h of programming rate, maximum heating temperature is 1260 ℃, is incubated afterwards 300 minutes, then adopts controlled rolling process to carry out the rolling of II stage control, 950 ℃ of first stage rolling temperatures, be rolled to 160mm, second stage rolling temperature is 850 ℃, is rolled to finished steel plate thickness 100mm, obtain semi-finished product steel plate, the single pass drafts of wherein first stage rolling, second stage rolling is 25mm;
(3) semi-finished product steel plate carries out water-cooled, and red temperature is 710 ℃, carries out afterwards stacking slow cooling again, 50 hours stacking time, make finished steel plate, and finished steel plate thickness is 100mm.
After the finished steel plate de-stacking making, carry out ultrasonic examination, internal quality of steel plate has reached the flaw detection I level of GB/T2970-2004 standard-required, thickness direction 1/2 place's Z-direction service check result: 50%, 48%, 53%, meet the requirement of standard Z35.
Claims (3)
1. a production method for thick, the ultrasonic examination I grade steel plate of 100-200mm, is characterized in that, comprises the following steps:
(1) molten steel casting of having smelted is become to steel ingot, then steel ingot band temperature cleaning, cleaning temperature is not less than 150 ℃, the stewing steel of shove charge after cleaning, then adopt low speed to burn steel, 1000 ℃ of following programming rates are not more than 120 ℃/h, and maximum heating temperature is 1250 ± 10 ℃, is incubated afterwards 300-500 minute; Then rolling-cogging, rolling temperature is 1000-1150 ℃, is rolled to the 2-4 of finished steel plate thickness doubly, obtains cogging material;
(2) heat described cogging material, 1000 ℃ of following programming rates are not more than 120 ℃/h, maximum heating temperature is 1250 ± 10 ℃, be incubated afterwards 300-500 minute, then adopt controlled rolling process to carry out the rolling of II stage control, first stage rolling temperature 950-1150 ℃, be rolled to finished steel plate thickness+60mm, second stage rolling temperature is 850-900 ℃, is rolled to finished steel plate thickness, obtains semi-finished product steel plate;
(3) described semi-finished product steel plate carries out water-cooled, and red temperature is 680-720 ℃, carries out afterwards stacking slow cooling again, and the stacking time is not less than 48 hours, makes finished steel plate, and finished steel plate thickness is 100-200mm.
2. the production method of steel plate according to claim 1, is characterized in that, in step (1), casting adopts die casting method to cast, the degree of superheat is 30-40 ℃, casting rate is steel ingot body 14-18 minute, cap mouth 4-7 minute, and the thickness of the steel ingot that casting obtains is 450-980mm.
3. the production method of steel plate according to claim 1, is characterized in that, while adopting controlled rolling process to carry out the rolling of II stage control in step (2), the single pass drafts of first stage rolling, second stage rolling is 25-35mm.
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| CN103343208B (en) * | 2013-07-12 | 2017-05-24 | 鞍钢股份有限公司 | Production method of super-thick 15NnNi steel plates |
| CN105499268B (en) * | 2016-01-16 | 2017-12-15 | 舞阳钢铁有限责任公司 | A kind of milling method of high alloy super-thick steel plate |
| CN105855485A (en) * | 2016-05-31 | 2016-08-17 | 舞阳钢铁有限责任公司 | Die casting method for medium carbon steel large ingot slab |
| CN112030057A (en) * | 2020-08-05 | 2020-12-04 | 舞阳钢铁有限责任公司 | Method for improving flaw detection qualification rate of continuous casting billet finished low alloy thick plate |
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| CN101185940A (en) * | 2007-12-19 | 2008-05-28 | 重庆钢铁(集团)有限责任公司 | Production technology of Q370qD bridge plate |
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