CN101648212B - Bloom continuous casting dynamic soft reduction process for prestressed steel SWRH82B - Google Patents
Bloom continuous casting dynamic soft reduction process for prestressed steel SWRH82B Download PDFInfo
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- CN101648212B CN101648212B CN2009100754046A CN200910075404A CN101648212B CN 101648212 B CN101648212 B CN 101648212B CN 2009100754046 A CN2009100754046 A CN 2009100754046A CN 200910075404 A CN200910075404 A CN 200910075404A CN 101648212 B CN101648212 B CN 101648212B
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- 238000009749 continuous casting Methods 0.000 title claims abstract description 52
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 50
- 239000010959 steel Substances 0.000 title claims abstract description 49
- 238000011946 reduction process Methods 0.000 title claims abstract description 14
- 238000005266 casting Methods 0.000 claims abstract description 19
- 239000007787 solid Substances 0.000 claims description 14
- 230000000881 depressing effect Effects 0.000 claims description 10
- 238000001816 cooling Methods 0.000 claims description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 4
- 238000013019 agitation Methods 0.000 claims description 3
- 238000013459 approach Methods 0.000 claims description 3
- 230000005499 meniscus Effects 0.000 claims description 3
- 238000005204 segregation Methods 0.000 abstract description 19
- 229910052799 carbon Inorganic materials 0.000 abstract description 5
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 abstract description 4
- 229910000677 High-carbon steel Inorganic materials 0.000 abstract description 4
- 230000007547 defect Effects 0.000 abstract description 4
- 238000004519 manufacturing process Methods 0.000 abstract description 4
- 238000005272 metallurgy Methods 0.000 abstract description 2
- 230000008602 contraction Effects 0.000 abstract 2
- 239000007790 solid phase Substances 0.000 abstract 2
- 238000005516 engineering process Methods 0.000 description 15
- 238000000034 method Methods 0.000 description 8
- 238000007711 solidification Methods 0.000 description 7
- 230000008023 solidification Effects 0.000 description 7
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 6
- 239000000203 mixture Substances 0.000 description 6
- 230000002950 deficient Effects 0.000 description 5
- 230000000994 depressogenic effect Effects 0.000 description 4
- 239000013078 crystal Substances 0.000 description 3
- 229910052742 iron Inorganic materials 0.000 description 3
- 239000012071 phase Substances 0.000 description 3
- 238000005096 rolling process Methods 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 238000011160 research Methods 0.000 description 2
- 229910000746 Structural steel Inorganic materials 0.000 description 1
- 238000005275 alloying Methods 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 230000001112 coagulating effect Effects 0.000 description 1
- 238000002425 crystallisation Methods 0.000 description 1
- 230000008025 crystallization Effects 0.000 description 1
- 210000001787 dendrite Anatomy 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000007791 liquid phase Substances 0.000 description 1
- 229910000734 martensite Inorganic materials 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000010791 quenching Methods 0.000 description 1
- 238000009628 steelmaking Methods 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
Abstract
The invention relates to a bloom continuous casting dynamic soft reduction process for prestressed steel SWRH82B, belonging to the technical field of metallurgy continuous casting and used for solving the problems of internal quality defects of casting billets such as central segregation, central porosity, central contraction cavity, and the like which are easy to occur in high carbon steel bloom continuous casting. The invention adopts the technical scheme that in a continuous casting soft reduction region, the reduction amount is controlled by variation of casting billet central solid phase rate fs, and a quantitative relationship of the reduction amount of a soft reduction stand and the casting billet central solid phase rate is given. By adopting the dynamically controlled soft reduction process, the central segregation of prestressed steel SWRH82B casting billets can be remarkably lightened with the casting billet center carbon segregation index of 0.96 to 1.05 and the average value of 1.02, and the central porosity and the central contraction cavity of the prestressed steel SWRH82B casting billets can also be remarkably improved with the casting billet central porosity of no more than 1.0 level and the central pipe of no more than 0.5 level. The technical requirements for manufacturing prestressed steel wires/steel strands are satisfied by wires rolled by the continuous casting billets.
Description
Technical field
The present invention relates to a kind of continuous casting process, particularly can eliminate or alleviate the prestress steel SWRH82B bloom continuous casting dynamic soft reduction process of strand internal soundness defectives such as bloom center segregation, component segregation, center porosity, central pipe, belong to the metallurgical continuous casting technical field.
Background technology
Prestress steel SWRH82B is the structural steel that is used for key projects such as overpass, skyscraper, tunnel, Longspan Bridge, water conservancy projects, nuclear power station.This steel strand center segregation, center porosity and central pipe can cause rolling wire rod heart portion deterioration, even in the cold martensitic structure that produces when bad of control, thereby in the drawing of producing steel strand wires, twist with the fingers in burst technology and produce brittle fracture, reduce product quality.Especially to being the hypereutectoid steel of representative with w (c) up to 0.82% SWRH82B, center segregation, center porosity and central pipe are the main subject matter that influences the bloom internal soundness.SWRH82B belongs to high-carbon steel, and strand is in process of setting, and the top layer is because Quench generates tiny equiax crystal, along with the top layer concreting thickness increases, the inner outwards heat-transfer capability of strand reduces, and strand begins to present directional solidification, forms the strip dendrite (column crystal) of ecto-entad.The reason of dividing crystallization owing to choosing, solute element gathers to liquid phase region, when producing " bridging " phenomenon when the column crystal growth, the molten steel of enrichment solute element be closed and can not with other fluid exchange, form the normal segregation of C, S, elements such as P, Cr at this place, and be attended by defectives such as center porosity and remaining shrinkage cavity.Therefore, study and define rational SWRH82B continuous casting process, solving comparatively serious technical barriers such as SWRH82B continuous casting billet center segregation, center porosity and central pipe, stably produce high-quality continuous casting billet, is the key link of Development and Production high-quality SWRH82B steel.
" steel-making " magazine the 21st volume the 3rd interim Wuhan Iron and Steel Company's first steel mill of once having reported June in 2005 adopts passive light to depress technology reduction SWRH82B high-carbon steel 200mm * 200mm bloom segregation.Passive light is depressed its light depressing position, drafts, depressed speed is changeless in the continuous casting process, and the casting blank solidification end position is to determine gently to depress a whether rational important parameter of technology, therefore, when continuous casting pulling rate, the degree of superheat, intensity of cooling etc. change, adopt passive light to depress technology and be difficult to the central defects such as center segregation, center porosity that success alleviates continuous casting billet.
" steel research " magazine the 35th the 5th phase of volume of October in 2007 has reported that Shoudu Iron and Steel Co adopts secondary cooling system to improve little square billet quality.2007 the 4th phases of " Tianjin metallurgy " magazine have reported that Tianjin Iron﹠Steel Co., Ltd. adopts the solidification end electromagnetic agitating technology to improve little square billet quality.Above-mentioned research is to carry out at little square billet, and its process is difficult to the bigger effect of performance aspect the control of central defects such as bloom SWRH/S82B steel strand center segregation, center porosity, central pipe.
Chinese patent 200710048924.9 discloses a kind of dynamic soft reduction technologies for bloom continuous casting of heavy rail, though Properties of Heavy Rail Steel By and SWRH82B steel belong to high-carbon steel together, but the carbon content of the two still there are differences, particularly both alloying elements and content all have nothing in common with each other, they will cause the difference of steel grade mechanical behavior under high temperature and coagulating property, the difference of two-phase section shape particularly is so finally will cause the two difference on main technologic parameters.
Summary of the invention
Technical problem to be solved by this invention is: a kind of a kind of prestress steel SWRH82B bloom continuous casting dynamic soft reduction process that can significantly alleviate or eliminate defectives such as center segregation, center porosity, central pipe is provided.
The alleged problem of the present invention is solved by following technical scheme:
A kind of prestress steel SWRH82B bloom continuous casting dynamic soft reduction process, its special feature is: gently depress the zone at continuous casting, drafts is controlled in variation by strand center solid rate fs, the pass of gently depressing frame drafts and strand center solid rate is: drafts is 0 when 0≤fs＜0.4, drafts is 2.0mm when 0.40≤fs≤0.44, drafts is 3.0mm when 0.60≤fs≤0.64, drafts is 3.5mm when 0.75≤fs≤0.79, drafts is 3.0mm when 0.87≤fs≤0.91, drafts is 2.0mm when 0.95≤fs≤0.99, and drafts is 0 when 0.99＜fs≤1.0; When gently depressing frame strand center solid rate and be in numerical value between above-mentioned two data segments, then adopt approach based on linear interpolation to calculate the pairing drafts of this frame according to its solid rate.
Above-mentioned prestress steel SWRH82B bloom continuous casting dynamic soft reduction process, it is described that gently to depress regional casting blank solidification rate be 30%～100%, overall reduction is 8.375～13.5mm, the single maximum reduction≤3.5mm that gently depresses frame, maximum depression rate≤2.65mm/m.
Above-mentioned prestress steel SWRH82B bloom continuous casting dynamic soft reduction process, continuous casting pulling rate 0.65～0.80m/min, molten steel temperature in tundish is controlled at 1478～1498 ℃, the continuous casting ratio water yield is 0.18～0.28L/kg, gently depress regional casting blank surface temperature and be controlled at 780～950 ℃, the casting billet surface maximum speed≤20 ℃/m that rises again in the secondary cooling zone, maximum rate of temperature fall≤15 ℃/m.
Above-mentioned prestress steel SWRH82B bloom continuous casting dynamic soft reduction process, described gently depress the zone to the distance of crystallizer meniscus in 16187mm～24649mm scope, gently depressing regional total length is 8462mm.
Above-mentioned prestress steel SWRH82B bloom continuous casting dynamic soft reduction process, crystallizer electromagnetic agitation current strength is controlled to be 500A, and frequency is 2.4Hz, and rotation mode is unidirectional rotation.
The present invention is directed to prestress steel SWRH82B bloom continuous casting is prone to strand internal soundness defect problems such as center segregation, center porosity, central pipe and improves, its crucial part is that the composition, continuous casting pulling rate, superheat of liquid steel, continuous casting intensity of cooling according to prestress steel SWRH82B etc. influences factors such as casting blank solidification end position, and what propose dynamically control gently depresses technology.Adopt this technology can significantly alleviate prestress steel SWRH82B strand center segregation, strand center carbon segregation index 0.96～1.05, average 1.02; This technology also can obviously be improved prestress steel SWRH82B strand center porosity and central pipe, strand center porosity≤1.0 grade, central pipe≤0.5 grade.The rolling wire rod of continuous casting billet with the inventive method processing can satisfy the specification requirement of manufacturing compressor wire/steel strand wires.
The specific embodiment
The present invention is applicable to that C content is 0.79～0.86%, Cr content is 0.17～0.50%, Si content is that 0.15-0.35%, Mn content are 0.60-0.90%, and cross dimensions is greater than the prestress steel SWRH82B continuous casting blooms of 220mm * 220mm.Technology of the present invention is determined a drafts of depressing frame according to casting parameters such as prestress steel SWRH82B composition, pulling rate, the degree of superheat, intensities of cooling in good time, to alleviate defectives such as strand center segregation, center porosity, central pipe, can also improve simultaneously the uniformity of continuous casting billet composition, stabilize and increase the mechanical property and the serviceability of SWRH82B prestressing steel, reach and manufacture the prestress wire specification requirement.
Major technique measure of the present invention is as follows:
(1). formulate rational prestress steel SWRH82B continuous casting pulling rate and molten steel temperature in tundish control system:
Continuous casting pulling rate 0.65～0.80m/min, molten steel temperature in tundish is controlled at 1478～1498 ℃, guarantee that casting blank solidification end is positioned at and gently depress the zone, gently depress regional total length 8462mm, the variation flexible modulation that can adapt to continuous casting process such as steel grades, continuous casting pulling rate, the degree of superheat, intensity of cooling etc. is gently depressed zone length and drafts.
(2). gently depressing the solid rate control drafts of zone according to each strand center, straightening roller position, gently depress regional casting blank solidification rate 30%～100%, overall reduction is 8.375～13.5mm.Gently depress the zone, the single maximum reduction≤3.5mm that gently depresses frame, maximum depression rate≤2.65mm/m.Gently depress the relation such as the following table of frame drafts and strand solid rate:
| Solid rate fs | ＜0.40 | 0.40-0.44 | 0.60-0.64 | 0.75-0.79 | 0.87-0.91 | 0.95-0.99 | ＞0.99 |
| Drafts | 0 | 2.0 | 3.0 | 3.5 | 3.0 | 2.0 | 0 |
When strand center solid rate less than 0.40 with greater than 0.99 the time, do not depress, when each frame strand center solid rate is in numerical value between table two data segment, then adopt known approach based on linear interpolation to calculate the pairing drafts of this frame according to its solid rate.
(3). the control parameter of two cool regions:
The continuous casting ratio water yield is 0.18～0.28L/kg, gently depress 780～950 ℃ of regional casting blank surface temperatures, guarantee that continuous casting gently depresses regional strand and have good high-temperature extension performance, and the two cold-zone casting billet surface maximums speed≤20 ℃/m that rises again, maximum rate of temperature fall≤15 ℃/m.
(4). adopt reasonable crystallizer electromagnetic agitation technological parameter, current strength is controlled to be 500A, and frequency is 2.4Hz, and rotation mode is unidirectional rotation.
Described embodiment implements on the conticaster that is provided with 7 frame straightening machines, gently depresses the regional distance that arrives the crystallizer meniscus in 16187mm～24649mm scope, and gently depressing regional total length is 8462mm.
Embodiment 1: adopt technology of the present invention to control prestress steel SWRH82B continuous casting blooms quality, the bloom cross dimensions is 280mm * 325mm, and the main chemical compositions (%) of cast heat is as shown in the table:
| C | Si | Mn | P | S | Cr |
| 0.81 | 0.17 | 0.76 | 0.012 | 0.011 | 0.27 |
The main technologic parameters of cast heat continuous casting is as shown in the table:
Embodiment 2: adopt technology of the present invention to control prestress steel SWRH82B continuous casting blooms quality, the bloom cross dimensions is 280mm * 325mm, and the main chemical compositions (%) of cast heat is as shown in the table:
| C | Si | Mn | P | S | Cr |
| 0.82 | 0.18 | 0.77 | 0.014 | 0.009 | 0.26 |
The main technologic parameters of cast heat continuous casting is as shown in the table:
Embodiment 3: adopt technology of the present invention to control prestress steel SWRH82B continuous casting blooms quality, the bloom cross dimensions is 280mm * 325mm, and the main chemical compositions (%) of cast heat is as shown in the table:
| C | Si | Mn | P | S | Cr |
| 0.80 | 0.18 | 0.76 | 0.012 | 0.010 | 0.27 |
The main technologic parameters of cast heat continuous casting is as shown in the table:
Technology of the present invention is dynamically gently depressed by continuous casting billet, alleviates and has eliminated defectives such as strand center segregation, center porosity, central pipe, strand center carbon segregation index 0.96～1.05, average 1.02; Strand center porosity≤1.0 grade, central pipe≤0.5 grade, and satisfy the specification requirement of making compressor wire/steel strand wires by the rolling wire rod of continuous casting billet.
Claims (3)
1. prestress steel SWRH82B bloom continuous casting dynamic soft reduction process, it is characterized in that: gently depress the zone at continuous casting, drafts is controlled in variation by strand center solid rate fs, the pass of gently depressing frame drafts and strand center solid rate is: drafts is 0 when 0≤fs＜0.4, drafts is 2.0mm when 0.40≤fs≤0.44, drafts is 3.0mm when 0.60≤fs≤0.64, drafts is 3.5mm when 0.75≤fs≤0.79, drafts is 3.0mm when 0.87≤fs≤0.91, drafts is 2.0mm when 0.95≤fs≤0.99, and drafts is 0 when 0.99＜fs≤1.0; When gently depressing frame strand center solid rate and be in numerical value between above-mentioned two data segments, then adopt approach based on linear interpolation to calculate the pairing drafts of this frame according to its solid rate, single maximum reduction≤the 3.5mm that gently depresses frame, maximum depression rate≤2.65mm/m, continuous casting pulling rate 0.65～0.80m/min, molten steel temperature in tundish is controlled at 1478～1498 ℃, the continuous casting ratio water yield is 0.18～0.28L/kg, gently depress regional casting blank surface temperature and be controlled at 780～950 ℃, the casting billet surface maximum speed≤20 ℃/m that rises again in the secondary cooling zone, maximum rate of temperature fall≤15 ℃/m.
2. prestress steel SWRH82B bloom continuous casting dynamic soft reduction process according to claim 1 is characterized in that: described gently depress the zone to the distance of crystallizer meniscus in 16187mm～24649mm scope, gently depressing regional total length is 8462mm.
3. prestress steel SWRH82B bloom continuous casting dynamic soft reduction process according to claim 1 and 2 is characterized in that: crystallizer electromagnetic agitation current strength is controlled to be 500A, and frequency is 2.4Hz, and rotation mode is unidirectional rotation.
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| CN103128247A (en) * | 2013-03-15 | 2013-06-05 | 北京科技大学 | Method for producing 60 mm extra-thick steel plates with low compression ratio |
| CN104942252B (en) * | 2015-07-23 | 2017-03-08 | 攀钢集团攀枝花钢铁研究院有限公司 | A kind of method improving Properties of Heavy Rail Steel bloom internal soundness |
| CN104959562A (en) * | 2015-07-23 | 2015-10-07 | 攀钢集团攀枝花钢铁研究院有限公司 | Large billet heavy rail steel continuous casting method |
| CN105033209A (en) * | 2015-08-11 | 2015-11-11 | 甘肃酒钢集团宏兴钢铁股份有限公司 | Method for improving quality of high-carbon steel in continuous casting process |
| CN106735026B (en) * | 2016-12-09 | 2020-02-14 | 东北大学 | Single-point and continuous heavy pressing process for solidification tail end of continuous casting billet |
| CN109396368B (en) * | 2018-12-21 | 2021-01-26 | 南京钢铁股份有限公司 | Method for improving internal quality of high-carbon steel bloom continuous casting billet |
| CN110252981A (en) * | 2019-06-10 | 2019-09-20 | 邢台钢铁有限责任公司 | Mitigate the continuous casting process of bearing steel bloom internal soundness defect |
| CN111360221B (en) * | 2020-04-03 | 2021-05-25 | 中天钢铁集团有限公司 | Method for eliminating central shrinkage cavity and controlling central segregation of high-carbon steel with 280mm x 320mm section |
| CN114433802A (en) * | 2020-10-30 | 2022-05-06 | 五矿营口中板有限责任公司 | Method for improving center segregation of medium carbon steel of ultra-thick plate blank |
| CN112453342A (en) * | 2020-10-30 | 2021-03-09 | 五矿营口中板有限责任公司 | Method for improving center segregation of low-carbon steel of ultra-thick plate blank |
| CN113000803B (en) * | 2021-02-24 | 2022-11-25 | 建龙北满特殊钢有限责任公司 | Continuous casting process method for improving internal quality of high-carbon steel bloom |
| CN115106493B (en) * | 2022-06-16 | 2024-03-01 | 山西太钢不锈钢股份有限公司 | Method for improving center density of S355NL steel continuous casting blank for wind power flange |
| CN115055654B (en) * | 2022-08-16 | 2023-01-31 | 江苏省沙钢钢铁研究院有限公司 | High-carbon steel wire rod and production method thereof |
| CN115780757B (en) * | 2023-01-31 | 2023-05-09 | 东北大学 | Solidifying tail end depressing method and depressing device for controlling central quality of casting blank |
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