CN102345065A - Strip steel for bridge and production method and system thereof - Google Patents
Strip steel for bridge and production method and system thereof Download PDFInfo
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- CN102345065A CN102345065A CN2011103117193A CN201110311719A CN102345065A CN 102345065 A CN102345065 A CN 102345065A CN 2011103117193 A CN2011103117193 A CN 2011103117193A CN 201110311719 A CN201110311719 A CN 201110311719A CN 102345065 A CN102345065 A CN 102345065A
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 79
- 239000010959 steel Substances 0.000 title claims abstract description 79
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 19
- 239000012535 impurity Substances 0.000 claims abstract description 12
- 239000000126 substance Substances 0.000 claims abstract description 9
- 229910052698 phosphorus Inorganic materials 0.000 claims abstract description 5
- 238000000034 method Methods 0.000 claims description 21
- 238000005096 rolling process Methods 0.000 claims description 21
- 239000002184 metal Substances 0.000 claims description 13
- 229910052751 metal Inorganic materials 0.000 claims description 13
- 238000007670 refining Methods 0.000 claims description 10
- 229910052717 sulfur Inorganic materials 0.000 claims description 9
- 238000003723 Smelting Methods 0.000 claims description 8
- 239000004615 ingredient Substances 0.000 claims description 6
- 238000005266 casting Methods 0.000 claims description 4
- 238000009749 continuous casting Methods 0.000 claims description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 abstract description 36
- 229910052742 iron Inorganic materials 0.000 abstract description 14
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N iron oxide Inorganic materials [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 abstract 1
- NDLPOXTZKUMGOV-UHFFFAOYSA-N oxo(oxoferriooxy)iron hydrate Chemical compound O.O=[Fe]O[Fe]=O NDLPOXTZKUMGOV-UHFFFAOYSA-N 0.000 abstract 1
- 230000003749 cleanliness Effects 0.000 description 4
- 238000002203 pretreatment Methods 0.000 description 4
- 238000003466 welding Methods 0.000 description 4
- 150000001875 compounds Chemical class 0.000 description 3
- 238000001816 cooling Methods 0.000 description 3
- 238000002788 crimping Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 230000002349 favourable effect Effects 0.000 description 3
- 229910052758 niobium Inorganic materials 0.000 description 3
- 229910004283 SiO 4 Inorganic materials 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 235000021110 pickles Nutrition 0.000 description 2
- 238000001556 precipitation Methods 0.000 description 2
- 229910052596 spinel Inorganic materials 0.000 description 2
- 239000011029 spinel Substances 0.000 description 2
- 238000005728 strengthening Methods 0.000 description 2
- 238000010276 construction Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000013000 roll bending Methods 0.000 description 1
- 238000009628 steelmaking Methods 0.000 description 1
- 229910052720 vanadium Inorganic materials 0.000 description 1
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- Metal Rolling (AREA)
- Heat Treatment Of Steel (AREA)
- Heat Treatment Of Sheet Steel (AREA)
Abstract
The invention discloses strip steel for a bridge and a production method and system thereof, belonging to the technical field of steel products. The strip steel for the bridge produced by using the production method and system comprises the following chemical components in percentage by weight: 0.08-0.12% of C, not more than 0.15% of Si, 1.00-1.40% of Mn, not more than 0.020% of P, not more than of 0.012% of S, 0.02-0.06% of Alt, 0.02-0.04% of Nb, 0.01-0.02% of Ti and the balance of Fe and inevitable impurities. The strip steel can meet the quality requirement on steel of the Q370q series bridge. Meanwhile, because P- and Si-removing pretreatment is carried out on melted iron by using a converter which is independently arranged and can remove P and Si in the production method and system of the strip steel, the Si content in the strip steel is lower, the generated ferric oxide sheet is easy to remove, the surface quality of the strip steel is ensured, and the content of P as an impurity element is also lower.
Description
Technical field
The present invention relates to the steel technical field, particularly a kind of bridge is with band steel, its working method and production system thereof.
Background technology
Along with the needs of bridge construction development, bridge structure is more and more stricter to the requirement of energy-conserving and environment-protective, safe reliability, and this just has higher requirement with specification, performance and the surface quality of steel to bridge.Bridge is mainly with steel and uses the hot rolled slab band steel that plate mill is produced, the hot-rolled sheet coil that also has use heat tandem rolling unit to produce, and generally between 4～25mm, material is mainly Q345qC/D and Q390qC/D to the roll bending specification limit.Use heat tandem rolling unit is produced hot-rolled sheet coil and is compared with using the dull and stereotyped band of plate mill production steel, has output height, efficient is high, automatic control level is high, product surface quality good, dimensional precision is high, lumber recovery is high characteristics.
At present, the bridge of domestic public reported is mainly Q345q, Q370q and Q390q with the material of steel, and it mainly adopts Nb microalloying or Nb, V combined microalloying.Point out in the document of publishing: the 14MnNbq that Wuhan Iron and Steel Plant is produced is suitable with the Q370q performance, and the mass percent of its main chemical compositions is respectively: C0.11～0.17%, Si0.2～0.6%, Mn1.2～1.6%, Nb0.02～0.04%; The Q370q that the Hunan steel is produced, the mass percent of its main chemical compositions is respectively: C0.12～0.15%, Si0.35～0.45%, Mn1.2～1.7%, Nb0.015～0.035%, Ni0.21～0.25%.In these steel, because Si content is higher, the FeO/Fe that in steel billet heat-processed, forms
2SiO
4Spinel compound is more, causes the steel strip surface de-scaling not to the utmost, the steel strip surface quality deteriorated.And; In traditional in the past process for making; Molten iron utilizes KR to take off the S device to take off S pre-treatment → converter smelting → furnace outer refining process; Because of taking off P and take off Si, molten iron in converter steelmaking process, in same converter, carries out with taking off C; Process efficiency is low; Simultaneously, the cleanliness factor of molten steel can not farthest be controlled.
Summary of the invention
In order to address the above problem, what the present invention proposes the production of a kind of use heat continuous mill can satisfy bridge usefulness band steel, its working method and the production system thereof that the Q370q Series Bridge requires with steel quality.
Press as follows the technology side of band steel provided by the invention:
Bridge provided by the invention is respectively with the chemical ingredients mass percent of band steel: C0.08 ~ 0.12%, Si≤0.15%, Mn1.00 ~ 1.40%; P≤0.020%, S≤0.012%, Alt0.02 ~ 0.06%; Nb0.02 ~ 0.04%, Ti0.01 ~ 0.02%, all the other are Fe and impurity.
Following based on bridge provided by the invention with the technical scheme of the working method of band steel:
Bridge provided by the invention comprises hot metal pretreatment with the working method of band steel, forms slab behind converter smelting, LF refining, the continuous casting; Slab obtains said band steel through hot continuous rolling, and said hot metal pretreatment comprises:
Utilize KR to take off the S device and take off S,
Utilize independent converter of laying to take off P and take off Si.
As preferably, the temperature of reheat is 1160 ~ 1220 ℃ in said hot continuous rolling process, 3.0 ~ 3.5 hours heat-up times.
As preferably, the finishing temperature of finish rolling is 820 ~ 860 ℃ in said hot continuous rolling process.
As preferably, the temperature of in said hot continuous rolling process, curling is 490 ~ 530 ℃.
Press as follows with the technology side of the production system of band steel based on bridge provided by the invention:
Bridge provided by the invention comprises hot metal pretreatment system, smelting converter, LF a refining unit, casting apparatus, the hot continuous mill of laying successively with the production system of band steel; Said hot metal pretreatment system comprises that the KR that being used to of laying successively take off S takes off the S device; And, the independent converter that can take off P and take off Si of laying.
Bridge provided by the invention is with the beneficial effect of band steel, its working method and production system thereof:
Bridge band steel with working method provided by the invention and production system production; Because it has low C, Nb, the characteristics of Ti combined microalloying have excellent mechanical property and processability; Welding property is good, can satisfy the specification of quality of Q370q Series Bridge with steel.Simultaneously, when using band steel production system provided by the invention, can utilize the independent P that can take off that lays with the converter of taking off Si molten iron to be taken off P and takes off the Si pre-treatment because the hot metal pretreatment system comprises, the cleanliness factor of molten steel can farthest be controlled.Thereby Si content is lower in this band steel, and the feasible iron scale that generates is easy to remove, thereby guarantees to be with the steel favorable surface quality, and is also lower as the P content of impurity element.
Description of drawings
Fig. 1 for the embodiment of the invention provide based on bridge provided by the invention synoptic diagram with the production system of band steel and working method thereof.
Embodiment
In order to understand the present invention in depth, the present invention is elaborated below in conjunction with accompanying drawing and specific embodiment.
Bridge provided by the invention can be hot-rolled sheet coil with the band steel, and its chemical ingredients mass percent is respectively: C0.08 ~ 0.12%, Si≤0.15%, Mn1.00 ~ 1.40%; P≤0.020%, S≤0.012%, Alt0.02 ~ 0.06%; Nb0.02 ~ 0.04%, Ti0.01 ~ 0.02%, all the other are Fe and impurity.
This bridge has following characteristic with the band steel:
This band steel C content is 0.08 ~ 0.12%.The C element is the main solution strengthening element in the steel, and can combine with microalloy elements such as Nb, Ti to form carbonitride, plays the effect of precipitation strength.C content is too low, the undercapacity of steel, and C content is too high, can reduce the toughness and the welding property of steel greatly.
This bridge is with band steel Si content≤0.15%.If when Si content is high, in process furnace, very easily form lot of F eO/Fe between iron scale and the strand matrix
2SiO
4Spinel compound firmly combines strand and iron scale, causes the steel strip surface iron scale to be removed endless, makes surface quality worsen.The Si too high levels will reduce the toughness and the welding property of steel simultaneously.
It is 1.00 ~ 1.40% that this bridge uses band steel Mn content range.Mn is the solution strengthening element, is to improve intensity and flexible effective element.Mn content is low excessively to cause hardness of steel low, and the Mn too high levels will make the decrease ductility of steel.
This bridge is with band steel P content≤0.020%, S content≤0.012%.P, S is impurity element, should be controlled at lower level.
It is 0.02 ~ 0.06% that this bridge uses band steel Alt content range.Alt is the deoxidant element in the steel, can reduce the inclusion in the steel, pure steel, the processability and the fatigue property of raising steel.
It is 0.02 ~ 0.04% that this bridge uses band steel Nb content range.Nb is strong carbonitride forming element, improves the intensity of steel through grain refining and precipitation strength, and improves the toughness of steel.
It is 0.01 ~ 0.02% that this bridge uses band steel Ti content range.The chemically reactive of Ti is very strong, is prone to form compound with C, N, O, S etc., has crystal grain thinning, improves performance in length and breadth, improves the effect of welding property.
This bridge comprises with the working method of band steel: hot metal pretreatment; Utilize converter smelting to take off C, the LF refining forms the chemical ingredients mass percent and is respectively: C0.08 ~ 0.12% behind the continuous casting; Si≤0.15%; Mn1.00 ~ 1.40%, P≤0.020%, S≤0.012%; Alt0.02 ~ 0.06%; Nb0.02 ~ 0.04%, Ti0.01 ~ 0.02%, all the other are the slab of Fe and impurity; This slab obtains said band steel through hot continuous rolling.
Wherein, hot metal pretreatment comprises that utilizing KR to take off the S device takes off S, utilizes independent converter of laying to take off P and take off Si; The temperature of reheat is 1160 ~ 1220 ℃ in the hot continuous rolling process, 3.0 ~ 3.5 hours heat-up times; The finishing temperature of finish rolling is 820 ~ 860 ℃ in the hot continuous rolling process; The temperature of in the hot continuous rolling process, curling is 490 ~ 530 ℃.
Because the P that can take off that this bridge is independently laid with the utilization of band steel working method takes off P and takes off the Si pre-treatment molten iron with the converter of taking off Si, the cleanliness factor of molten steel can farthest be controlled.Thereby Si content is lower in this band steel, and the feasible iron scale that generates is easy to remove, thereby guarantees to be with the steel favorable surface quality, and is also lower as the P content of impurity element.
This bridge comprises the hot metal pretreatment system that lays successively with the production system of band steel, smelting converter 3, and LF a refining unit 4, casting apparatus 5, hot continuous mill,
Wherein, this hot metal pretreatment system comprises that the KR that is used to take off S takes off S device 1 and can take off P and the converter 2 of taking off Si; This hot continuous mill can be 2250 hot tandem rolling broad strip mills, comprises process furnace 6, thick scale breaker 7, two roller roughing mills 8, four-high rougher 9, crop flying shear 10, pickle line processor 11, finishing train 12 and cooling facility for laminar flow 13 and crimping machine 14.
When using bridge provided by the invention with band steel production system, take off P and take off the Si pre-treatment with the 2 pairs of molten iron of converter that take off Si because utilization can be taken off P, the cleanliness factor of molten steel can farthest be controlled.Thereby Si content is lower in this band steel, and the feasible iron scale that generates is easy to remove, thereby guarantees to be with the steel favorable surface quality, and is also lower as the P content of impurity element.
Embodiment
Referring to accompanying drawing 1, molten iron is taken off S through KR desulfurizer 1 KR; Converter 2 is taken off P and is taken off Si; Smelting converter 3 takes off C; Through 4 refinings of LF a refining unit; Form the chemical ingredients mass percent through casting apparatus 5 and be respectively C0.08 ~ 0.12%, Si≤0.15%, Mn1.00 ~ 1.40%; P≤0.020%, S≤0.012%, Alt0.02 ~ 0.06%; Nb0.02 ~ 0.04%, Ti0.01 ~ 0.02%, all the other are the slab 15 of Fe and impurity; The slab specification is become: thick * wide=230mm * 1500mm.Then; Make that specification is that the slab of thick * wide=230mm * 1500mm promptly carries out hot continuous rolling through process furnace 6, thick scale breaker 7, two roller roughing mills 8, four-high rougher 9, crop flying shear 10, pickle line processor 11, finishing train 12, cooling facility for laminar flow 13, crimping machine 14 successively through 2250 hot tandem rolling broad strip mills; Wherein, Process furnace 6 temperature are 1179 ℃; Be 3.0 hours heat-up time; Finishing train 12 finishing temperatures are 844 ℃, and curling temperature is 509 ℃.Like this; After roughing, finish rolling, laminar flow cooling, curl through crimping machine 14, obtain the chemical ingredients mass percent at last and be respectively C0.08 ~ 0.12%; Si≤0.15%; Mn1.00 ~ 1.40%, P≤0.020%, S≤0.012%; Alt0.02 ~ 0.06%; Nb0.02 ~ 0.04%, Ti0.01 ~ 0.02%, all the other specifications for Fe and impurity are the hot-rolled sheet coil of thick * wide=25mm * 1500mm.
When bridge provided by the invention is used for bridge with the band steel; Its yield strength is 440MPa; Tensile strength is 540MPa; Unit elongation is that 28.5%, 3 times of clod wash is qualified, and-40 ℃ of impact of collision values are 288J; 285J; 284J, average out to 286J, over-all properties satisfies the performance requriements of Q370q Series Bridge with steel.
Above-described embodiment; The object of the invention, technical scheme and beneficial effect have been carried out further explain; Institute is understood that; The above only is the specific embodiment of the present invention; Be not limited to the present invention; All within spirit of the present invention and principle, any modification of being made, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (6)
1. a bridge is characterized in that the chemical ingredients mass percent is respectively: C0.08 ~ 0.12%, Si≤0.15% with the band steel; Mn1.00 ~ 1.40%, P≤0.020%, S≤0.012%, Alt0.02 ~ 0.06%; Nb0.02 ~ 0.04%, Ti0.01 ~ 0.02%, all the other are Fe and impurity.
2. based on the working method of the described bridge of claim 1, comprise hot metal pretreatment, form slab behind converter smelting, LF refining, the continuous casting with the band steel; Slab obtains said band steel through hot continuous rolling, it is characterized in that said hot metal pretreatment comprises:
Utilize KR to take off the S device and take off S,
Utilize independent converter of laying to take off P and take off Si.
3. method according to claim 2 is characterized in that, the temperature of reheat is 1160 ~ 1220 ℃ in said hot continuous rolling process, 3.0 ~ 3.5 hours heat-up times.
4. method according to claim 2 is characterized in that, the finishing temperature of finish rolling is 820 ~ 860 ℃ in said hot continuous rolling process.
5. method according to claim 2 is characterized in that, the temperature of in said hot continuous rolling process, curling is 490 ~ 530 ℃.
6. based on the production system of the described bridge of claim 1 with the band steel; Comprise hot metal pretreatment system, smelting converter, LF a refining unit, casting apparatus, the hot continuous mill laid successively; It is characterized in that said hot metal pretreatment system comprises that the KR that being used to of laying successively take off S takes off the S device and can take off P and the converter of taking off Si.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011103117193A CN102345065A (en) | 2011-10-14 | 2011-10-14 | Strip steel for bridge and production method and system thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011103117193A CN102345065A (en) | 2011-10-14 | 2011-10-14 | Strip steel for bridge and production method and system thereof |
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| Publication Number | Publication Date |
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| CN102345065A true CN102345065A (en) | 2012-02-08 |
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| CN2011103117193A Pending CN102345065A (en) | 2011-10-14 | 2011-10-14 | Strip steel for bridge and production method and system thereof |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN104498827A (en) * | 2014-12-29 | 2015-04-08 | 首钢总公司 | 355MPa-grade high heat input welding steel and preparation method thereof |
| CN104630627A (en) * | 2015-02-15 | 2015-05-20 | 山东钢铁股份有限公司 | Steel plate for DH36 ship structure and low-cost production method thereof |
| CN110369507A (en) * | 2019-06-18 | 2019-10-25 | 包头钢铁（集团）有限责任公司 | A method of efficiently removing high Si steel hot-rolled sheet belt surface red oxide |
| CN110735085A (en) * | 2019-09-25 | 2020-01-31 | 江苏沙钢集团有限公司 | Manufacturing method of thin Q345qE and Q370qE steel plates |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1418978A (en) * | 2001-11-14 | 2003-05-21 | 住友金属工业株式会社 | Anti-fatigue crack fine expansivity steel material and method for making same |
| CN101906584A (en) * | 2010-07-22 | 2010-12-08 | 首钢总公司 | Production method of environment-friendly high-surface-quality acid-cleaning-free automobile beam steel |
-
2011
- 2011-10-14 CN CN2011103117193A patent/CN102345065A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1418978A (en) * | 2001-11-14 | 2003-05-21 | 住友金属工业株式会社 | Anti-fatigue crack fine expansivity steel material and method for making same |
| CN101906584A (en) * | 2010-07-22 | 2010-12-08 | 首钢总公司 | Production method of environment-friendly high-surface-quality acid-cleaning-free automobile beam steel |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN104498827A (en) * | 2014-12-29 | 2015-04-08 | 首钢总公司 | 355MPa-grade high heat input welding steel and preparation method thereof |
| CN104630627A (en) * | 2015-02-15 | 2015-05-20 | 山东钢铁股份有限公司 | Steel plate for DH36 ship structure and low-cost production method thereof |
| CN104630627B (en) * | 2015-02-15 | 2016-09-21 | 山东钢铁股份有限公司 | A kind of DH36 ship structure steel plate and Low-cost production method thereof |
| CN110369507A (en) * | 2019-06-18 | 2019-10-25 | 包头钢铁（集团）有限责任公司 | A method of efficiently removing high Si steel hot-rolled sheet belt surface red oxide |
| CN110735085A (en) * | 2019-09-25 | 2020-01-31 | 江苏沙钢集团有限公司 | Manufacturing method of thin Q345qE and Q370qE steel plates |
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Application publication date: 20120208 |