CN101318287A - Method for manufacturing 460Mpa high-toughness medium plate for bridge - Google Patents
Method for manufacturing 460Mpa high-toughness medium plate for bridge Download PDFInfo
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- CN101318287A CN101318287A CNA2008101148119A CN200810114811A CN101318287A CN 101318287 A CN101318287 A CN 101318287A CN A2008101148119 A CNA2008101148119 A CN A2008101148119A CN 200810114811 A CN200810114811 A CN 200810114811A CN 101318287 A CN101318287 A CN 101318287A
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Abstract
The invention relates to a production method for medium plates used in bridges with the high strength and toughness of 460Mpa and belongs to the technical field of bridge steels. The smelting production technique with the carbon content of 0.07 percent to 0.10 percent is used, and the carbon content is less than or equal to 0.040 percent by the converter endpoint; and the carbon adding is controlled by using silicon ferromanganese iron and micro-carbon ferromanganese to be matched with manganese, desulfurizating the large argon with the opening of 100 percent and heating the argon with the opening of 30 percent; the micro-alloying of Nb, V and Ti is used; the micro-alloying is treated in vacuum after being refined in a ladle furnace; the sheet slab constant casting speed casting technique guarantees the casting blank quality; two stages of control rolling are carried out on a heavy plate mill, and the rerolling temperature is 850 DEG C to 950 DEG C, and the finish rolling temperature is 790 DEG C to 810 DEG C; a rolled control cooling system with the finish cooling temperature of 630 DEG C plus or minus 20 DEG C and the cooling temperature of 10 to 15 DEG C/S is used for obtaining ferrite and pearlite tissues; the yield strength of the steel plate is more than or equal to 460Mpa, the toughness under the low temperature of minus 40DEG C is more than or equal to 100J. The production method for the medium plates has the advantages that the tissue, the property and the welding adaptability of the steel plates can be controlled stably and a trail is blazed in the technical route of producing the bridge steel plates with the high strength and toughness of 460Mpa.
Description
Technical field
The invention belongs to bridge steel technical field, particularly relate to the production method of a kind of 460Mpa high-strength tenacity bridge, be applicable to of the production of yield strength 460Mpa level bridge with high-strength tenacity (hereinafter to be referred as Q460qE) medium plate with medium plate.
Background technology
Bridge plate is the important source material that is used to make engineering structure appliances such as bridge, along with the high parameter direction of Modern Steel Structure bridge to weldering of large span bolt or all welded construction develops, the bridge steel of exploitation high strength, high tenacity, easily welding becomes the very high important topic of technology content.Domestic and abroad bridge is based upon on 16Mnq (about the carbon 0.15%) basis substantially with the cut deal traditional processing technology, adopts the interpolation microalloy to improve its mechanical property, and the toughness of this class steel plate and welding adaptability are relatively poor; Low-carbon bainite steel is functional, but owing to add valuable alloying elements such as Mo, Cu, mild steel (C≤0.06%) is smelted uneconomical, and the organizational controls difficulty is big, the production cost height.And adopt than low-carbon (LC) route (C:0.07～0.10%), adding Nb, V, Ti simultaneously, the steel plate characteristics by controlled rolling and controlled cooling production are: bridge steel is smelted economical, the steel plate tissue is stable, and comprehensive mechanical property is good, and-40 ℃ of low-temperature impact toughness are good, carbon equivalent is low, easily welding.Technological difficulties are the economical production phosphorus content in the controlled rolling and controlled cooling technology of the smelting technique of 0.07-0.10% steel grade, steel plate internal soundness control technology, steel plate etc., and this requires very strict to each production process control.The technical essential of high-strength tenacity Q460qE bridge plate is the carbon increasing amount of strict control converter terminal carbon and process; Adopt application of vacuum again behind elder generation's ladle furnace refining, guarantee the steel cleaning, reduce gas content; Stablize casting process, obtain surface and all good slab of internal soundness; Adopt controlled rolling and controlled cooling, make steel plate obtain reasonably tissue and good comprehensive mechanical properties.
Summary of the invention
The objective of the invention is to, the production method of a kind of 460Mpa high-strength tenacity bridge with medium plate is provided, adopts the method for using medium plate than smelting and slab quality control, the steel plate cooling controlling and rolling controlling process steady production 460Mpa level high-strength tenacity bridge of mild steel.Under the prerequisite that guarantees the technology direct motion, by than mild steel (0.07～0.10%) smelting technique, suitably reduce carbon and carbon equivalent, improve the toughness and the welding adaptability of steel plate; By application of vacuum, reduce gas content in the steel, improve the steel plate internal soundness; Improve steel plate tissue, performance by microalloying and controlled rolling and controlled cooling technology, the rational steel product of productivity price ratio.
The present invention relates to a kind of 460Mpa high-strength tenacity bridge production method with medium plate, comprise desulfurizing iron skim → 100t converter smelting → ladle deoxidation alloying → ladle furnace refining → RH application of vacuum → feeding Si-Ca line → conventional slab caster cast → slab heating → controlled rolling → control cools off.It is characterized in that: adopt carbon containing 0.07～0.10% carbon steel smelting process for production; Adopt Nb, V, Ti microalloying; Carry out application of vacuum behind the ladle furnace refining; The permanent pulling rate pouring technology of sheet slab guarantees slab quality; On wide and heavy plate mill, carry out the controlled rolling of two stages; Back control cooling system is rolled in employing, 630 ± 20 ℃ of final cooling temperatures, and 10～15 ℃/S of cooling velocity is to obtain ferrite and pearlitic structrure, steel plate yield strength 〉=460Mpa ,-40 ℃ of low-temperature flexibility 〉=100J.
The main technique measure of this invention:
Double slag operation is adopted in converter, and aim carbon is by≤0.040% control, 1690～1710 ℃ of tapping temperatures, and the pushing off the slag tapping, the control slag is thick≤50mm.
Adopt fero-manganesesilicon and little carbon ferromanganese to join manganese.
Nb, V, Ti microalloying, Nb:0.025～0.04%, V:0.06～0.075%, Ti:0.005～0.015%.
Ladle furnace refining, big argon gas (aperture 100%) flow stirring desulphurization, the operation of little argon gas (aperture 30%) flow heating process.
Carry out application of vacuum, vacuum time 10-20min, terminal point hydrogen content≤2ppm.
Feeding Ca-Si line 400m/ stove carries out deformation processing of inclusion, and the soft blow time is pressed 10-15min control.
Adopt the permanent pulling rate full guard sheet slab casting of 0.8m/min and 0.80L/Kg specific water's secondary cooling system.
On wide and heavy plate mill, adopt the controlled rolling of two stages, 1000～1200 ℃ of austenite recrystallization rolling temperatures, non-recrystallization begins 850～950 ℃ of rolling temperatures, 790～810 ℃ of control finishing temperatures.
Adopt ACC control cooling system, 630 ± 20 ℃ of final cooling temperatures, 10～15 ℃/S of cooling velocity is to obtain ferrite and pearlitic structrure.Yield strength 〉=the 460Mpa of steel plate ,-40 ℃ of low-temperature flexibility 〉=100J.
The present invention has opened up a processing technology routine by producing Q460qE high-strength tenacity bridge steel plate than smelting and slab quality control, the controlled rolling and controlled cooling of mild steel; The present invention can stablize tissue, performance and the welding adaptability of control steel plate, and the plate quality of production is good, possesses mass production environment.
The specific embodiment
The present invention can implement in Wide and Thick Slab iron and steel enterprise, is below to adopt the example of production yield strength 460Mpa bridge of the present invention with medium plate.
Process route is: desulfurizing iron is skimmed → 100t converter smelting → ladle deoxidation alloying → ladle furnace refining → RH application of vacuum → hello Si-Ca line → conventional slab caster cast → slab heating → 4300mm milling train controlled rolling → control cooling → finished product finishing check.
Converter main technologic parameters such as following table.
| Heat | The converter terminal temperature (℃) | Converter terminal C, (%) | Fero-manganesesilicon addition (kg/t) | Little carbon ferromanganese addition (kg/t) |
| 7Q08010 | 1706 | 0.028 | 5.6 | 13.6 |
| 7Q08011 | 1696 | 0.030 | 5.6 | 13.6 |
Refining main technique data such as following table.
Casting parameters sees the following form.
| Heat | Teeming speed (m/min) | Water yield L/Kg | Tundish temperature (℃) | The strand situation |
| 7Q08010 | 0.8 | 0.80 | 1554 | Well |
| 7Q08011 | 0.8 | 0.80 | 1548 | Well |
The finished product composition sees the following form.
Rolling technological parameter sees the following form.
| Batch | Specification mm | The temperature of rerolling ℃ | Finishing temperature ℃ | Open cold temperature ℃ | Final cooling temperature ℃ | Cooling velocity ℃/S |
| 7Q08010B12 | 30 | 860 | 803 | 822 | 620 | 11 |
| 7Q08011B22 | 30 | 855 | 795 | 825 | 630 | 11 |
Finished product composition and stocking performance see the following form.
Claims (6)
1, a kind of 460Mpa high-strength tenacity bridge is with the production method of medium plate, comprise desulfurizing iron skim → 100t converter smelting → ladle deoxidation alloying → ladle furnace refining → RH application of vacuum → feeding Si-Ca line → conventional slab caster cast → slab heating → controlled rolling → control cools off; It is characterized in that, adopt carbon containing 0.07-0.10% carbon steel smelting process for production; Adopt Nb, V, Ti microalloying; Carry out application of vacuum behind the ladle furnace refining; The permanent pulling rate pouring technology of sheet slab guarantees slab quality; On wide and heavy plate mill, carry out the controlled rolling of two stages; Back control cooling system is rolled in employing, 630 ± 20 ℃ of final cooling temperatures, and 10～15 ℃/S of cooling velocity is to obtain ferrite and pearlitic structrure, steel plate yield strength 〉=460Mpa ,-40 ℃ of low-temperature flexibility 〉=100J.
2, according to the described production method of claim 1, it is characterized in that: described carbon containing 0.07-0.10% carbon steel smelting process for production is meant converter terminal carbon≤0.040% control, adopt fero-manganesesilicon and little carbon ferromanganese to join manganese, big argon flow amount aperture 100% desulfurization of ladle furnace, little argon flow amount aperture 30% heat up control procedure carbon increasing amount≤0.02%, finished product carbon content: 0.07～0.10%.
3, according to the described production method of claim 1, it is characterized in that: described microalloying is meant Nb:0.025 in the steel～0.045%, V:0.060～0.075%, Ti:0.005～0.015%.
4, according to the described production method of claim, it is characterized in that: carrying out the vacuum processing technique parameter behind the described ladle furnace refining is: vacuum processing time 10-20min, terminal point hydrogen content≤2ppm.
5, production method in accordance with claim is characterized in that: the permanent pulling rate pouring technology of described sheet slab is meant and adopts the permanent pulling rate cast of 2400mm sheet slab, adopts section 250 * 2000～2400mm, target pulling rate 0.80mm/min, specific water 0.8L/Kg.
6, production method in accordance with claim, it is characterized in that: described two stages controlled rolling is meant adopts the controlled rolling of two stages on the 4300mm milling train, 1000～1200 ℃ of austenite recrystallization rolling temperatures, non-recrystallization begins 850～950 ℃ of rolling temperatures, 790～810 ℃ of control finishing temperatures.
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| CN2008101148119A CN101318287B (en) | 2008-06-12 | 2008-06-12 | Method for manufacturing 460Mpa high-toughness medium plate for bridge |
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| CN2008101148119A CN101318287B (en) | 2008-06-12 | 2008-06-12 | Method for manufacturing 460Mpa high-toughness medium plate for bridge |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101817134A (en) * | 2010-03-22 | 2010-09-01 | 太原科技大学 | Short-flow casting and rolling composite forming method for ferrule piece |
| CN101838770A (en) * | 2010-06-13 | 2010-09-22 | 攀钢集团钢铁钒钛股份有限公司 | High-strength steel for transmission towers and production method thereof |
| CN101613828B (en) * | 2009-07-16 | 2011-05-18 | 首钢总公司 | Super-thick steel plate for low yield ratio buildings with 460 MPa grade yield strength and manufacturing method |
| CN103361552A (en) * | 2012-03-30 | 2013-10-23 | 鞍钢股份有限公司 | V-N microalloying 460MPa-level thick plate and manufacturing method thereof |
| CN104480392A (en) * | 2014-11-29 | 2015-04-01 | 首钢总公司 | Medium-thickness steel plate for bridge pipe pile with high toughness and narrow yield strength and production method thereof |
| CN106435084A (en) * | 2016-11-26 | 2017-02-22 | 湖南华菱湘潭钢铁有限公司 | Smelting method of ultralow-oxygen and medium-high-carbon steel |
| CN113817948A (en) * | 2021-08-16 | 2021-12-21 | 包头钢铁（集团）有限责任公司 | Production method of high-toughness bridge steel with yield strength of 345MPa |
-
2008
- 2008-06-12 CN CN2008101148119A patent/CN101318287B/en active Active
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101613828B (en) * | 2009-07-16 | 2011-05-18 | 首钢总公司 | Super-thick steel plate for low yield ratio buildings with 460 MPa grade yield strength and manufacturing method |
| CN101817134A (en) * | 2010-03-22 | 2010-09-01 | 太原科技大学 | Short-flow casting and rolling composite forming method for ferrule piece |
| CN101838770A (en) * | 2010-06-13 | 2010-09-22 | 攀钢集团钢铁钒钛股份有限公司 | High-strength steel for transmission towers and production method thereof |
| CN103361552A (en) * | 2012-03-30 | 2013-10-23 | 鞍钢股份有限公司 | V-N microalloying 460MPa-level thick plate and manufacturing method thereof |
| CN104480392A (en) * | 2014-11-29 | 2015-04-01 | 首钢总公司 | Medium-thickness steel plate for bridge pipe pile with high toughness and narrow yield strength and production method thereof |
| CN106435084A (en) * | 2016-11-26 | 2017-02-22 | 湖南华菱湘潭钢铁有限公司 | Smelting method of ultralow-oxygen and medium-high-carbon steel |
| CN113817948A (en) * | 2021-08-16 | 2021-12-21 | 包头钢铁（集团）有限责任公司 | Production method of high-toughness bridge steel with yield strength of 345MPa |
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| CN101318287B (en) | 2010-06-23 |
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Address after: 100041 Shijingshan Road, Shijingshan District, Shijingshan District, Beijing Patentee after: Shougang Group Co. Ltd. Address before: 100041 Shijingshan Road, Shijingshan District, Shijingshan District, Beijing Patentee before: Capital Iron & Steel General Company |