CN102601114A - 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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- CN102601114A CN102601114A CN2012100489095A CN201210048909A CN102601114A CN 102601114 A CN102601114 A CN 102601114A CN 2012100489095 A CN2012100489095 A CN 2012100489095A CN 201210048909 A CN201210048909 A CN 201210048909A CN 102601114 A CN102601114 A CN 102601114A
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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 the steel plate technical field, being specifically related to a kind of thickness is the production method that 100-200mm, steel plate internal soundness satisfy the steel plate of ultrasonic examination GB/T 2970I level or the requirement of JB/T 4730.3I level.
Background technology
When producing the 100-200mm steel plate at present; Generally all adopt rolling mill practice of Large Flat steel ingot,, therefore the roll-force of milling train is had relatively high expectations because temperature drop is very fast in the operation of rolling; For the little milling train of roll-force; Because penetration is relatively poor, the steel plate internal soundness that rolls out is difficult to satisfy the requirement of higher non-destructive testing standard, like the requirement of non-destructive testing standard GB/T 2970I level or JB/T 4730.3I level in the operation of rolling.If the replacing large-sized rolling mills then 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 purpose, the technical scheme that the present invention adopted is: a kind of 100-200mm is thick, the production method of ultrasonic examination I grade steel plate, may further comprise the steps:
(1) will smelt good molten steel casting and become steel ingot, steel ingot band temperature cleaning then, the cleaning temperature is not less than 150 ℃; The stewing steel of cleaning back shove charge adopts low speed to burn steel then, and programming rate below 1000 ℃ is not more than 120 ℃/h; Maximum heating temperature is 1250 ± 10 ℃, is incubated 300-500 minute afterwards; Rolling-cogging then, rolling temperature is 1000-1150 ℃, the 2-4 that is rolled to the finished steel plate thickness doubly obtains the cogging material;
(2) the said cogging material of heating, programming rate below 1000 ℃ is not more than 120 ℃/h, and maximum heating temperature is 1250 ± 10 ℃; Be incubated 300-500 minute afterwards, adopt controlled rolling process to carry out II stage controlled rolling then, phase I rolling temperature 950-1150 ℃; Be rolled to finished steel plate thickness+60mm; The second stage rolling temperature is 850-900 ℃, is rolled to the finished steel plate thickness, obtains the semi-finished product steel plate;
(3) said semi-finished product steel plate carries out water-cooled, and returning red temperature is 680-720 ℃, carries out stacking slow cooling afterwards again, and the stacking time was not less than 48 hours, made the finished product steel plate, and the finished steel plate thickness is 100-200mm.
Further, casting adopts die casting method to cast in the step (1), 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 with loose for big thickness ingot solidification process, obtains raw material cast slab preferably.
When adopting controlled rolling process to carry out II stage controlled rolling in the step (2), the single pass drafts that the phase I is rolling, second stage is rolling is 25-35mm.
During stacking slow cooling, guarantee that steel plate rolls back stacking in time in the step (3), surface temperature is not less than 400 ℃ during stacking.
The molten steel smelting process is: molten steel is earlier through electric furnace smelting; Send into the refining of LF stove afterwards and adjust composition; Guarantee the LF refining cycle more than 50 minutes, deoxidation is good, when liquid steel temperature reaches 1560-1580 ℃; Change vacuum degassing furnace (VD stove) application of vacuum over to, add Al line and slag making material before the application of vacuum.Refining cycle control and suitable deoxidation system that the molten steel smelting process is strict, purpose 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; At first the raw material cast slab is carried out cogging, be rolled to 2-4 times of finished steel plate thickness, obtain the cogging material through rolling method; And then heating cogging material, adopt controlled rolling process to carry out II stage controlled rolling afterwards, be rolled to the finished steel plate thickness, obtain the semi-finished product steel plate, afterwards the rerolled steel plate is carried out water-cooled, stacking slow cooling processing, make the finished product steel plate.The production method of steel plate provided by the invention divides two operations the raw material cast slab to be rolled down to the thickness of finished product steel plate; The thick inequality of crystal grain that has solved the mill milling insufficient pressure and caused, toughness lower phenomenon; Avoided the too fast finished product steel plate internal penetration problem on deformation that causes of cooling in the present rolling mill practice; The finished steel intralamellar part quality that makes is fine and close; Can satisfy 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 through sufficient stacking slow cooling, make that cardiac stress is able to slow release in the steel plate, avoided the 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 the I level requires makes has the following advantages: (1) steel plate thickness directional properties obviously improves, and can satisfy the Z35 standard; (2) the steel plate composition is even, internal soundness is finer and close, and the metallurgical level of steel plate is higher, and internal soundness can satisfy the requirement of ultrasonic examination standard GB/T 2970-2004I level or JB/T 4730-2005I grade steel plate; (3) the steel plate maximum ga(u)ge can reach 200mm.The steel plate that the alternative part electroslag remelting process of the steel plate that adopts the inventive method to produce is produced is suitable for the 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 may further comprise the steps:
(1) molten steel is earlier through electric furnace smelting; Send into the refining of LF stove afterwards and adjust composition, LF refining cycle 65 minutes, deoxidation is good; When liquid steel temperature reaches 1560 ℃; Change vacuum degassing furnace (VD stove) application of vacuum over to, the application of vacuum process kept 20 minutes at 66Pa, added Al line and slag making material before the application of vacuum; Become steel ingot with smelting good molten steel casting, 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; Steel ingot band temperature cleaning then, 160 ℃ of cleaning temperature, the stewing steel of cleaning back shove charge adopts low speed to burn steel then, 110 ℃/h of programming rate below 1000 ℃, maximum heating temperature is 1260 ℃, is incubated 500 minutes afterwards; Rolling-cogging then, rolling temperature is 1000 ℃, is rolled to 550mm, obtains the cogging material;
(2) heating cogging material, 115 ℃/h of programming rate below 1000 ℃, maximum heating temperature is 1250 ℃; Be incubated 500 minutes afterwards, adopt controlled rolling process to carry out II stage controlled rolling then, 1150 ℃ of phase I rolling temperatures; Be rolled to 260mm, the second stage rolling temperature is 900 ℃, is rolled to finished steel plate thickness 200mm; Obtain the semi-finished product steel plate, the single pass drafts that wherein phase I is rolling, second stage is rolling is 35mm;
(3) the semi-finished product steel plate carries out water-cooled, and returning red temperature is 680 ℃, carries out stacking slow cooling afterwards again, 58 hours stacking time, make the finished product steel plate, and the finished steel plate thickness is 200mm.
Carry out ultrasonic examination after the finished product steel plate de-stacking that makes, the steel plate internal soundness has reached the flaw detection I level of GB/T2970-2004 standard-required, and thickness direction 1/2 Z of place is to the performance assay: 38%, 40%, 45%, satisfy 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 may further comprise the steps:
(1) molten steel is earlier through electric furnace smelting; Send into the refining of LF stove afterwards and adjust composition, LF refining cycle 55 minutes, deoxidation is good; When liquid steel temperature reaches 1580 ℃; Change vacuum degassing furnace (VD stove) application of vacuum over to, the application of vacuum process kept 20 minutes at 66Pa, added Al line and slag making material before the application of vacuum; Become steel ingot with smelting good molten steel casting, 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; Steel ingot band temperature cleaning then, 155 ℃ of cleaning temperature, the stewing steel of cleaning back shove charge adopts low speed to burn steel then, 115 ℃/h of programming rate below 1000 ℃, maximum heating temperature is 1240 ℃, is incubated 300 minutes afterwards; Rolling-cogging then, rolling temperature is 1150 ℃, is rolled to 600mm, obtains the cogging material;
(2) heating cogging material, 110 ℃/h of programming rate below 1000 ℃, maximum heating temperature is 1260 ℃; Be incubated 300 minutes afterwards, adopt controlled rolling process to carry out II stage controlled rolling then, 950 ℃ of phase I rolling temperatures; Be rolled to 240mm, the second stage rolling temperature is 850 ℃, is rolled to finished steel plate thickness 180mm; Obtain the semi-finished product steel plate, the single pass drafts that wherein phase I is rolling, second stage is rolling is 25mm;
(3) the semi-finished product steel plate carries out water-cooled, and returning red temperature is 700 ℃, carries out stacking slow cooling afterwards again, 60 hours stacking time, make the finished product steel plate, and the finished steel plate thickness is 180mm.
Carry out ultrasonic examination after the finished product steel plate de-stacking that makes, the steel plate internal soundness has reached the flaw detection I level of JB/T4730-2005 standard-required, and thickness direction 1/2 Z of place is to the performance assay: 41%, 44%, 40%, satisfy 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 may further comprise the steps:
(1) molten steel is earlier through electric furnace smelting; Send into the refining of LF stove afterwards and adjust composition, LF refining cycle 60 minutes, deoxidation is good; When liquid steel temperature reaches 1560 ℃; Change vacuum degassing furnace (VD stove) application of vacuum over to, the application of vacuum process kept 20 minutes at 66Pa, added Al line and slag making material before the application of vacuum; Become steel ingot with smelting good molten steel casting, 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; Steel ingot band temperature cleaning then, 165 ℃ of cleaning temperature, the stewing steel of cleaning back shove charge adopts low speed to burn steel then, 105 ℃/h of programming rate below 1000 ℃, maximum heating temperature is 1250 ℃, is incubated 350 minutes afterwards; Rolling-cogging then, rolling temperature is 1100 ℃, is rolled to 450mm, obtains the cogging material;
(2) heating cogging material, 110 ℃/h of programming rate below 1000 ℃, maximum heating temperature is 1250 ℃; Be incubated 350 minutes afterwards, adopt controlled rolling process to carry out II stage controlled rolling then, 1000 ℃ of phase I rolling temperatures; Be rolled to 210mm, the second stage rolling temperature is 900 ℃, is rolled to finished steel plate thickness 150mm; Obtain the semi-finished product steel plate, the single pass drafts that wherein phase I is rolling, second stage is rolling is 30mm;
(3) the semi-finished product steel plate carries out water-cooled, and returning red temperature is 720 ℃, carries out stacking slow cooling afterwards again, 48 hours stacking time, make the finished product steel plate, and the finished steel plate thickness is 150mm.
Carry out ultrasonic examination after the finished product steel plate de-stacking that makes, the steel plate internal soundness has reached the flaw detection I level of JB/T4730-2005 standard-required, and thickness direction 1/2 Z of place is to the performance assay: 56%, 51%, 55%, satisfy 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 may further comprise the steps:
(1) molten steel is earlier through electric furnace smelting; Send into the refining of LF stove afterwards and adjust composition, LF refining cycle 55 minutes, deoxidation is good; When liquid steel temperature reaches 1580 ℃; Change vacuum degassing furnace (VD stove) application of vacuum over to, the application of vacuum process kept 20 minutes at 66Pa, added Al line and slag making material before the application of vacuum; Become steel ingot with smelting good molten steel casting, 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; Steel ingot band temperature cleaning then, 155 ℃ of cleaning temperature, the stewing steel of cleaning back shove charge adopts low speed to burn steel then, 115 ℃/h of programming rate below 1000 ℃, maximum heating temperature is 1240 ℃, is incubated 400 minutes afterwards; Rolling-cogging then, rolling temperature is 1150 ℃, is rolled to 300mm, obtains the cogging material;
(2) heating cogging material, 110 ℃/h of programming rate below 1000 ℃, maximum heating temperature is 1260 ℃; Be incubated 300 minutes afterwards, adopt controlled rolling process to carry out II stage controlled rolling then, 950 ℃ of phase I rolling temperatures; Be rolled to 160mm, the second stage rolling temperature is 850 ℃, is rolled to finished steel plate thickness 100mm; Obtain the semi-finished product steel plate, the single pass drafts that wherein phase I is rolling, second stage is rolling is 25mm;
(3) the semi-finished product steel plate carries out water-cooled, and returning red temperature is 710 ℃, carries out stacking slow cooling afterwards again, 50 hours stacking time, make the finished product steel plate, and the finished steel plate thickness is 100mm.
Carry out ultrasonic examination after the finished product steel plate de-stacking that makes, the steel plate internal soundness has reached the flaw detection I level of GB/T2970-2004 standard-required, and thickness direction 1/2 Z of place is to the performance assay: 50%, 48%, 53%, satisfy the requirement of standard Z35.
Claims (3)
1. the production method of thick, the ultrasonic examination I grade steel plate of a 100-200mm is characterized in that, may further comprise the steps:
(1) will smelt good molten steel casting and become steel ingot, steel ingot band temperature cleaning then, the cleaning temperature is not less than 150 ℃; The stewing steel of cleaning back shove charge adopts low speed to burn steel then, and programming rate below 1000 ℃ is not more than 120 ℃/h; Maximum heating temperature is 1250 ± 10 ℃, is incubated 300-500 minute afterwards; Rolling-cogging then, rolling temperature is 1000-1150 ℃, the 2-4 that is rolled to the finished steel plate thickness doubly obtains the cogging material;
(2) the said cogging material of heating, programming rate below 1000 ℃ is not more than 120 ℃/h, and maximum heating temperature is 1250 ± 10 ℃; Be incubated 300-500 minute afterwards, adopt controlled rolling process to carry out II stage controlled rolling then, phase I rolling temperature 950-1150 ℃; Be rolled to finished steel plate thickness+60mm; The second stage rolling temperature is 850-900 ℃, is rolled to the finished steel plate thickness, obtains the semi-finished product steel plate;
(3) said semi-finished product steel plate carries out water-cooled, and returning red temperature is 680-720 ℃, carries out stacking slow cooling afterwards again, and the stacking time was not less than 48 hours, made the finished product steel plate, and the finished steel plate thickness is 100-200mm.
2. the production method of steel plate according to claim 1 is characterized in that, casting adopts die casting method to cast in the step (1); 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, when adopting controlled rolling process to carry out II stage controlled rolling in the step (2), the single pass drafts that the phase I is rolling, second stage is rolling is 25-35mm.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103343208A (en) * | 2013-07-12 | 2013-10-09 | 鞍钢股份有限公司 | Production method of extra-thick 15MnNi steel plate |
| CN105499268A (en) * | 2016-01-16 | 2016-04-20 | 舞阳钢铁有限责任公司 | High-alloy super-thick steel plate rolling method |
| 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 |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006289435A (en) * | 2005-04-11 | 2006-10-26 | Nippon Steel Corp | Skin pass rolling mill and skin pass rolling method of thick steel plate |
| 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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2012
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006289435A (en) * | 2005-04-11 | 2006-10-26 | Nippon Steel Corp | Skin pass rolling mill and skin pass rolling method of thick steel plate |
| 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 |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103343208A (en) * | 2013-07-12 | 2013-10-09 | 鞍钢股份有限公司 | Production method of extra-thick 15MnNi steel plate |
| CN103343208B (en) * | 2013-07-12 | 2017-05-24 | 鞍钢股份有限公司 | Production method of extra-thick 15MnNi steel plate |
| CN105499268A (en) * | 2016-01-16 | 2016-04-20 | 舞阳钢铁有限责任公司 | High-alloy super-thick steel plate rolling method |
| 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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