WO2024040707A1 - 一种无头连铸连轧生产超低碳钢卷的方法及生产线 - Google Patents

一种无头连铸连轧生产超低碳钢卷的方法及生产线 Download PDF

Info

Publication number
WO2024040707A1
WO2024040707A1 PCT/CN2022/124555 CN2022124555W WO2024040707A1 WO 2024040707 A1 WO2024040707 A1 WO 2024040707A1 CN 2022124555 W CN2022124555 W CN 2022124555W WO 2024040707 A1 WO2024040707 A1 WO 2024040707A1
Authority
WO
WIPO (PCT)
Prior art keywords
rolling
continuous casting
low carbon
carbon steel
rough
Prior art date
Application number
PCT/CN2022/124555
Other languages
English (en)
French (fr)
Inventor
肖学文
韩会全
张万里
王万慧
Original Assignee
中冶赛迪工程技术股份有限公司
中冶赛迪技术研究中心有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 中冶赛迪工程技术股份有限公司, 中冶赛迪技术研究中心有限公司 filed Critical 中冶赛迪工程技术股份有限公司
Publication of WO2024040707A1 publication Critical patent/WO2024040707A1/zh

Links

Images

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
    • B21B1/46—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling metal immediately subsequent to continuous casting
    • B21B1/463—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling metal immediately subsequent to continuous casting in a continuous process, i.e. the cast not being cut before rolling
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
    • B21B1/22—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length
    • B21B1/24—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length in a continuous or semi-continuous process
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
    • B21B45/004—Heating the product
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
    • B21B45/04—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for de-scaling, e.g. by brushing
    • B21B45/06—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for de-scaling, e.g. by brushing of strip material

Definitions

  • the invention belongs to the technical field of strip steel continuous casting and rolling, and relates to a method and a production line for endless continuous casting and rolling to produce ultra-low carbon steel coils.
  • the endless continuous casting and rolling process represented by ESP has achieved great success in industrial applications. Compared with conventional hot continuous rolling, its process is compact, energy consumption is low, and the cost per ton of steel is significantly reduced; continuous casting and rolling The speed is high and the production efficiency is high; the endless rolling eliminates the strip threading and flicking process during single-piece rolling. The accuracy and stability of the strip size and performance are significantly improved, and the thickness of the strip can be stably produced at 1.2mm. The following thin strips realize partial replacement of cooling with heat, reducing strip production costs.
  • a 105mm billet, a drawing speed of 5.2m/min, and an intermediate billet of 8.5mm to 9mm are used.
  • the thinnest low-carbon strip steel for stable rolling is 0.8mm.
  • the surface temperature of the billet at the outlet of continuous casting is about 980°C. ⁇ 1000°C, it enters rough rolling directly without rough descaling.
  • the surface temperature of the intermediate billet at the outlet of the rough rolling unit is about 960°C ⁇ 980°C, and the surface temperature of the induction heating inlet is about 910°C ⁇ 930°C. If the production is thinner, such as 0.6mm, According to the configuration of the existing ESP production line, the finishing rolling load will increase, resulting in the inability to maintain stable production for a long time.
  • the thickness of the intermediate billet needs to be reduced to reduce the finishing rolling load.
  • the existing ESP's three roughing mills are used. Configuration, the thinning of the intermediate billet means that the rolling deformation of a single rough rolling stand exceeds 60%, which is theoretically feasible but unrealistic because it can easily exceed the design limit of the rolling mill capacity and deteriorate the shape of the intermediate billet.
  • One of the effective means to reduce the thickness of the intermediate billet is to increase the number of roughing mills to make the intermediate billet thinner to 6mm.
  • a problem arises that is, increasing the roughing mill will lead to an increase in the surface temperature drop of the intermediate billet at the rough rolling outlet.
  • the use of rough descaling is an effective solution.
  • rough descaling will also increase the temperature drop. Such accumulation will lead to a lower drum performance compared with the existing ESP.
  • the induction heating inlet temperature downstream of shearing will be lower than the phase transformation starting temperature Ar 3 of low carbon steel, and then rapidly heated to the austenitizing temperature, which can easily cause a mixed crystal structure and bring risks to the performance of low carbon strip steel.
  • the object of the present invention is to provide a method and a production line for endless continuous casting and rolling to produce ultra-low carbon steel coils, so as to suppress the generation of mixed crystal structure of the strip, reduce the risk of strip performance, and facilitate thinner rolling.
  • the thinner intermediate billet required for strip steel and the rough descaling required for strip steel with higher surface quality create process conditions.
  • a production line for endless continuous casting and rolling to produce ultra-low carbon steel coils including the following steps: continuous casting, rough rolling, cutting, heating, finish rolling, laminar cooling, slitting, and coiling into coils; in rough rolling Finally, the intermediate billet is heated so that the surface temperature of the intermediate billet when it enters the downstream heating device is higher than the starting temperature Ar 3 of austenite to ferrite transformation.
  • the temperature compensation temperature T of the intermediate billet heating is determined according to the number n of the rough rolling mill in the upstream rough rolling mill group, T ⁇ k(n-3)+t, where k is the temperature drop of a single rough rolling mill, t ⁇ [0, 40°C].
  • rough rolling is performed using at least 4 rough rolling stands.
  • the temperature of the rough-rolled intermediate billet is not lower than 40°C before entering the downstream swing shear.
  • the temperature of the surface of the cast slab at the outlet of the continuous casting machine is 980°C ⁇ 1000°C; the surface temperature of the intermediate slab at the outlet of the rough rolling end frame is 900°C ⁇ 920°C, and the heating device located after the swing shear The inlet temperature is greater than 890°C.
  • the thickness of the continuous casting billet is 95mm ⁇ 115mm, the width is 900mm ⁇ 1600mm, the thickness of the intermediate billet after rough rolling is 6mm ⁇ 20mm, and the thickness of the strip after finishing rolling is 0.6mm ⁇ 4mm.
  • the continuous casting speed is 4.0m/min ⁇ 6.0m/min.
  • composition of ultra-low carbon steel is C ⁇ 0.02%, Si ⁇ 0.05%, Mn ⁇ 0.1%, P ⁇ 0.02%, S ⁇ 0.003%, Alt ⁇ 0.04%.
  • a production line for endless continuous casting and rolling to produce ultra-low carbon steel coils including a continuous casting machine, a rough rolling unit, a shearing and scrap pushing device, a heating device, a finishing rolling unit, and laminar flow cooling that are sequentially arranged along the rolling direction.
  • device, high-speed flying shear and coiling unit, and an intermediate billet temperature replenishing device is provided between the rough rolling mill unit and the shearing and scrap pushing device to replenish the temperature of the intermediate billet so that the surface temperature of the intermediate billet when entering the downstream heating device is higher than that of Austen
  • the starting temperature Ar 3 for the transformation of body to ferrite The starting temperature Ar 3 for the transformation of body to ferrite.
  • the rough rolling mill group includes at least 4 rough rolling stands.
  • a rough descaling device is provided between the continuous casting machine and the rough rolling mill group.
  • a fine descaling device is provided between the heating device and the finishing rolling mill group.
  • the coarse descaling device and/or fine descaling device is a high-pressure water descaling device.
  • the intermediate blank warming device and heating device are induction heating devices or flue gas heating devices.
  • the shearing and scrap pushing device includes a pendulum shear, a scrap pushing device, a drum shear and a stack plate removal device that are arranged sequentially along the rolling direction.
  • the length of the scrap pushing device is 10m to 12m.
  • the length of the stacking plate removal device is 2.5m ⁇ 4m.
  • the finishing rolling mill group includes 5 finishing rolling stands.
  • the intermediate billet temperature compensation device located between the roughing end stand and the swing shear can effectively compensate for the temperature drop in the intermediate billet caused by the increase in the number of roughing stands and the use of rough descaling, allowing the ultra-low carbon steel intermediate billet to pass After rough rolling and deformation, when transported to the induction heating device after drum shearing, it is always in the austenite zone above Ar 3 , and ferrite transformation does not occur, so it effectively reduces the premature phase transformation of some structures and rapidly heats the reverse phase.
  • the phase transformation results in tissue refinement, while the non-phase transformation tissue coarsens, resulting in the risk of tissue mixed crystals.
  • adding a rough rolling mill can effectively reduce the thickness of the intermediate billet, creating favorable conditions for finishing rolling to thinner specifications; increasing the use of rough descaling can effectively solve the problem of iron oxide scale formed during the continuous casting stage entering the rough rolling, causing iron scale compression The problem is that it gets into the surface of the intermediate blank and is difficult to remove later.
  • Figure 1 is a schematic layout diagram of a production line for producing ultra-low carbon steel coils through endless continuous casting and rolling according to the present invention.
  • a method for producing ultra-low carbon steel coils with endless continuous casting and rolling includes the following steps: continuous casting, rough rolling, cutting, heating, finish rolling, laminar cooling, slitting, and coiling. Coil; after rough rolling, the intermediate billet is heated so that the surface temperature of the intermediate billet when entering the downstream heating device is higher than the starting temperature Ar 3 of the transformation of austenite to ferrite.
  • the temperature T of the intermediate billet can be determined based on the number n of the roughing mills in the upstream roughing mill group. .
  • the temperature T of the intermediate billet should also take into account the temperature drop of rough descaling. Therefore, when rough descaling is not performed before rough rolling, T ⁇ k(n-3), where k is the temperature drop of a single rough rolling mill; conversely, T ⁇ k(n-3)+t, t ⁇ [30°C, 40°C].
  • the two can also be unified as: T ⁇ k(n-3)+t, t ⁇ [0, 40°C].
  • the surface temperature of the slab at the outlet of the continuous casting machine is 980°C ⁇ 1000°C; the surface temperature of the intermediate billet at the outlet of the rough rolling mill is 900°C ⁇ 920°C , the intermediate billet is heated by 40°C to 80°C through the intermediate billet heating device located between the roughing end frame and the swing shear entrance, so that the intermediate billet that passes through the swing shear and accident shear areas and is air-cooled can then enter the swing shear.
  • the temperature at the entrance of the downstream heating device is greater than 890°C.
  • the continuous casting speed can be 4.0m/min ⁇ 6.0m/min.
  • the thickness of the intermediate billet after rough rolling can reach 6mm ⁇ 20mm
  • the thickness of the strip after finish rolling can reach 0.6mm ⁇ 4mm.
  • high-pressure water of 10MPa to 20MPa can be used for rough descaling to remove oxide scale to prevent the oxide scale formed during the continuous casting stage from entering rough rolling and affecting the surface quality of the strip.
  • a production line for endless continuous casting and rolling to produce ultra-low carbon steel coils including a continuous casting machine 1, a rough rolling unit 3, a shearing and scrap pushing device, a heating device 9, and a finishing rolling unit 11 arranged sequentially along the rolling direction. , laminar flow cooling device 12, high-speed flying shear 13 and coiling unit 14.
  • An intermediate billet heating device 4 is provided between the rough rolling unit 3 and the shearing and scrap pushing device 6 to replenish the temperature of the intermediate billet so that the intermediate billet can enter the downstream.
  • the surface temperature when heating the device is higher than the starting temperature Ar 3 of austenite to ferrite transformation.
  • more than 4 roughing mills can be selected for roughing mill group 3. From an economic point of view, four roughing mills should be selected for roughing mill unit 3, and five should be selected for finishing rolling mill unit 11.
  • a rough descaling device 2 can also be installed between the continuous casting machine 1 and the rough rolling mill group 3, and a fine descaling device 10 can be installed between the heating device and the finishing rolling mill group 11 to improve the surface quality of the strip 103.
  • the coarse descaling device 2 and the fine descaling device 10 should use high-pressure water descaling devices.
  • the intermediate billet temperature supplementing device 4 and the heating device 9 can be an induction heating device or a flue gas heating device, preferably an induction heating device.
  • the induction heating device is convenient to arrange and has flexible temperature control.
  • the shearing and scrap pushing device can be composed of a pendulum shear 5 and a scrap pushing device 6 arranged sequentially along the rolling direction, or it can also be composed of a pendulum shear 5, a scrap pushing device 6, a drum shear 7 and a stacking plate arranged sequentially along the rolling direction. It is composed of a removal device 8, which facilitates accident handling. Along the rolling direction, the length of the scrap pushing device 6 is 10m-12m, and the length of the stacking plate removal device 8 is 2.5m-4m.
  • a production line for endless continuous casting and rolling to produce ultra-low carbon steel coils including a continuous casting machine 1, a high-pressure water rough descaling device 2, a rough rolling unit 3, an intermediate billet heating device 4, and a swing shear 5, which are connected in sequence.
  • the rough descaling pressure is 10MPa ⁇ 20MPa.
  • the rough rolling unit adopts 4 rolling stands.
  • the intermediate billet heating device 4 preferably has 2 to 3 groups of induction heating devices.
  • the length of the waste pushing device 6 is about 11m along the rolling direction.
  • the stacking plate moves The length of the removing device 8 along the rolling direction is approximately 3m.
  • Ultra-low carbon strip steel composition :
  • the mass percentages are: C ⁇ 0.02%, Mn ⁇ 0.1%, Si ⁇ 0.05%, P ⁇ 0.02%, S ⁇ 0.003%, Alt ⁇ 0.04%, and the balance is Fe.
  • the austenite to ferrite transformation temperature Ar 3 in this composition is 880°C to 890°C at a cooling rate of 1°C/s to 5°C/s.
  • the strip temperatures at each position of the production line are shown in Table 1.
  • the temperatures without intermediate billet heating under the same equipment parameters and production line layout spacing are also listed for comparison.
  • the intermediate billet temperature compensation device 4 Since the intermediate billet temperature compensation device 4 is added between the roughing end stand R4 and the swing shear 5, it can effectively compensate for the additional intermediate billet temperature drop caused by the commissioning of the rough descaling device 2 and the addition of a roughing mill.
  • the intermediate billet from the rough rolling stand R4 to the entrance of the induction heating device 9 is always above the Ar 3 phase transformation point of ultra-low carbon steel, that is, the complete austenite zone, thereby suppressing the phase transformation first and then reverse.
  • the mixed crystal structure and performance risks of phase change are more reasonable from the perspective of process temperature control.
  • it also creates process conditions for thinner intermediate blanks required for rolling thinner strips and rough descaling required for higher surface quality strips.
  • the feasibility of implementation of the present invention is relatively high.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Metal Rolling (AREA)

Abstract

本发明涉及一种无头连铸连轧生产超低碳钢卷的方法及生产线，属于带钢连铸连轧技术领域，包括沿轧制方向顺次设置的连铸机、粗轧机组、中间坯补温装置、剪切推废装置、加热装置、精轧机组、层流冷却装置、高速飞剪和卷取机组，其中，中间坯补温装置用于中间坯的补温，以补偿由于上游粗轧机架的增加和粗除鳞带来的温降，使进入下游加热装置的中间坯表面温度高于奥氏体向铁素体转变的开始温度Ar 3，进而抑制了带钢混晶组织的产生，降低了性能风险，为轧制更薄带钢所需的更薄中间坯、更高表面质量带钢所需的粗除鳞创造了工艺条件。

Description

一种无头连铸连轧生产超低碳钢卷的方法及生产线 技术领域
本发明属于带钢连铸连轧技术领域，涉及一种无头连铸连轧生产超低碳钢卷的方法及生产线。
背景技术
近年来，以ESP为代表的无头连铸连轧工艺在工业应用上取得了较大成功，与常规热连轧相比，其流程紧凑、能耗低、吨钢成本明显降低；连铸拉速高，生产效率较高；无头轧制省去了单块轧制时的带钢穿带、甩尾过程，带钢尺寸和性能的精度和稳定性提升明显，能稳定生产厚度在1.2mm以下的薄带钢，实现了部分以热代冷，降低了带钢生产成本。
目前工业实践中采用105mm的铸坯，5.2m/min拉速，8.5mm～9mm的中间坯，稳定轧制的最薄低碳带钢为0.8mm，其中连铸出口铸坯表面温度约980℃～1000℃，不经粗除鳞直接进入粗轧，粗轧机组出口中间坯表面温度约960℃～980℃，感应加热入口表面温度约910℃～930℃，如果生产再薄，如0.6mm，按照已有ESP产线的配置，会带来精轧轧制负荷的增加，导致不能长时稳定生产，故需降低中间坯厚度，以减轻精轧负荷，而采用现有ESP的3架粗轧机配置，中间坯变薄意味着粗轧单机架轧制变形量均超过60％，理论可行但不现实，因为易造成超过轧机能力设计极限和中间坯板形的恶化。
降低中间坯厚度的有效手段之一是增加粗轧机数量，使中间坯轧制更薄到6mm，但问题随之出现，即增加粗轧机将导致中间坯在粗轧出口处表面温降增大，同时，随着下游用户对带钢表面质量要求的不断提高，粗除鳞投用是有效解决手段，但粗除鳞也会增加温降，如此累加，将导致和现有ESP相比，转鼓剪下游的感应加热入口温度会低于低碳钢种的相变开始温度Ar 3，随后再快速加热至奥氏体化温度，易造成混晶组织，给低碳带钢性能带来风险。
因此，需考虑无头连铸连轧工艺下，如何在增加粗轧机和粗除鳞后，防止低碳钢中间坯进入转鼓剪后的感应加热入口温度降低至相变点下，造成带钢组织性能风险的措施，并配置相应产线，以利于中间坯变薄，进而利于更薄规格带钢稳定生产。
发明内容
有鉴于此，本发明的目的在于提供一种无头连铸连轧生产超低碳钢卷的方法及生产线，以抑制带钢混晶组织的产生，降低带钢性能风险，为轧制更薄带钢所需的更薄中间坯、更高表面质量带钢所需的粗除鳞创造工艺条件。
为达到上述目的，本发明提供如下技术方案：
一种无头连铸连轧生产超低碳钢卷的生产线，包括以下步骤：连铸、粗轧、切头、加热、精轧、层流冷却、分切、卷取成卷；在粗轧后进行中间坯补温，以使中间坯进入下游加热装置时的表面温度高于奥氏体向铁素体转变的开始温度Ar 3。
可选地，中间坯补温的补温温度T根据上游的粗轧机组的粗轧机的数量n确定，T≥k(n-3)+t，其中，k为单架粗轧机的温降，t∈[0，40℃]。
可选地，当粗轧前进行粗除鳞时，t∈[30℃，40℃]。
可选地，粗轧采用至少4架粗轧机进行轧制。
可选地，粗轧前采用10MPa～20MPa的高压水进行粗除鳞。
可选地，粗轧后的中间坯在进入下游摆剪前补温不低于40℃。
可选地，铸坯表面在连铸机的出口处温度为980℃～1000℃；中间坯表面在粗轧末机架的出口处温度为900℃～920℃，在位于摆剪后的加热装置的入口处温度大于890℃。
可选地，连铸坯厚度为95mm～115mm，宽度为900mm～1600mm，粗轧后中间坯厚度为6mm～20mm，精轧后带钢厚度0.6mm～4mm。
可选地，连铸拉速为4.0m/min～6.0m/min。
可选地，超低碳钢的成分为C≤0.02％，Si≤0.05％，Mn≤0.1％，P≤0.02％，S≤0.003％，Alt≤0.04％。
一种无头连铸连轧生产超低碳钢卷的生产线，包括沿轧制方向顺次设置的连铸机、粗轧机组、剪切推废装置、加热装置、精轧机组、层流冷却装置、高速飞剪和卷取机组，粗轧机组与剪切推废装置之间设有中间坯补温装置以对中间坯补温，使中间坯进入下游加热装置时的表面温度高于奥氏体向铁素体转变的开始温度Ar 3。
可选地，所述粗轧机组包括至少4架粗轧机。
可选地，所述连铸机与粗轧机组之间设有粗除鳞装置。
可选地，所述加热装置与精轧机组之间设有精除鳞装置。
可选地，所述粗除鳞装置和/或精除鳞装置为高压水除鳞装置。
可选地，所述中间坯补温装置和加热装置为感应加热装置或烟气加热装置。
可选地，所述剪切推废装置包括沿轧制方向顺次设置的摆剪、推废装置、转鼓剪和垛板移除装置。
可选地，沿轧制方向，推废装置的长度为10m～12m。
可选地，沿轧制方向，垛板移除装置的长度为2.5m～4m。
可选地，所述精轧机组包括5架精轧机。
本发明的有益效果在于：
通过位于粗轧末机架和摆剪之间的中间坯补温装置，可以有效补偿由于粗轧机架数增加和投用粗除鳞后造成的中间坯温降，使得超低碳钢中间坯经过粗轧变形后，运至转鼓剪后的感应加热装置过程中，始终处于Ar 3以上的奥氏体区，不发生铁素体转变，故有效降低了部分组织提前相变又快速加热逆相变造成组织细化，而未相变组织粗化形成的组织混晶风险。同时，增加粗轧机可以有效降低中间坯厚度，为精轧轧制更薄规格创造了有利条件；增加粗除鳞投用，有效解决了连铸坯阶段形成的氧化铁皮进入粗轧，造成铁皮压入中间坯表面而后续难去除的问题。
本发明的其他优点、目标和特征在某种程度上将在随后的说明书中进行阐述，并且在某种程度上，基于对下文的考察研究对本领域技术人员而言将是显而易见的，或者可以从本发明的实践中得到教导。本发明的目标和其他优点可以通过下面的说明书来实现和获得。
附图说明
为了使本发明的目的、技术方案和优点更加清楚，下面将结合附图对本发明作优选的详细描述，其中：
图1为本发明无头连铸连轧生产超低碳钢卷的生产线的布置示意图。
附图标记：连铸机1、粗除鳞装置2、粗轧机组3、中间坯补温装置4、摆剪5、推废装置6、转鼓剪7、垛板移除装置8、加热装置9、精除鳞装置10、精轧机组11、层流冷却装置12、高速飞剪13、卷取机组14、铸坯101、中间坯102、带钢103。
具体实施方式
以下通过特定的具体实例说明本发明的实施方式，本领域技术人员可由本说明书所揭露的内容轻易地了解本发明的其他优点与功效。本发明还可以通过另外不同的具体实施方式加以实施或应用，本说明书中的各项细节也可以基于不同观点与应用，在没有背离本发明的精神下进行各种修饰或改变。需要说明的是，以下实施例中所提供的图示仅以示意方式说明本发明的基本构想，在不冲突的情况下，以下实施例及实施例中的特征可以相互组合。
其中，附图仅用于示例性说明，表示的仅是示意图，而非实物图，不能理解为对本发明的限制；为了更好地说明本发明的实施例，附图某些部件会有省略、放大或缩小，并不代表实际产品的尺寸；对本领域技术人员来说，附图中某些公知结构及其说明可能省略是可以理解的。
本发明实施例的附图中相同或相似的标号对应相同或相似的部件；在本发明的描述中，需要理解的是，若有术语“上”、“下”、“左”、“右”、“前”、“后”等指示的方位或位置关系为基于附图所示的方位或位置关系，仅是为了便于描述本发明和简化描述，而不是指示或暗示所指的装置或元件必须具有特定的方位、以特定的方位构造和操作，因此附图中描述位置关系的用语仅用于示例性说明，不能理解为对本发明的限制，对于本领域的普通技术人员而言，可以根据具体情况理解上述术语的具体含义。
请参阅图1，一种无头连铸连轧生产超低碳钢卷的方法，包括以下步骤：连铸、粗轧、切头、加热、精轧、层流冷却、分切、卷取成卷；在粗轧后进行中间坯补温，以使中间坯进入下游加热装置时的表面温度高于奥氏体向铁素体转变的开始温度Ar 3。
由于增加1架粗轧机将导致中间坯在粗轧出口处表面温降增加大约25℃～35℃，因此中间坯补温的补温温度T可根据上游的粗轧机组的粗轧机的数量n确定。同时，由于粗除鳞也会增加约30℃～40℃的温降，因此当粗轧前进行粗除鳞时，中间坯补温的补温温度T也应考虑粗除鳞温降。因此，当粗轧前不进行进行粗除鳞时，T≥k(n-3)，其中，k为单架粗轧机的温降；反之，T≥k(n-3)+t，t∈[30℃，40℃]。二者也可统一为：T≥k(n-3)+t，t∈[0，40℃]。
当粗轧采用4架粗轧机进行轧制时，铸坯表面在连铸机的出口处温度为980℃～1000℃；中间坯表面在粗轧末机架的出口处温度为900℃～920℃，中间坯通过位于粗轧末机架和摆剪入口之间的中间坯补温装置补温40℃～80℃，可使而后经过摆剪和事故剪区域空冷的中间坯，在随后进入摆剪下游的加热装置入口处温度大于890℃。连铸拉速可为4.0m/min～6.0m/min。
采用4架粗轧机和5架精轧机轧制厚度为95mm～115mm、宽度为900mm～1600mm的连铸坯时，粗轧后的中间坯厚度可达6mm～20mm，精轧后带钢厚度可达0.6mm～4mm。粗轧前可采用10MPa～20MPa的高压水进行粗除鳞，以去除氧化皮，避免连铸坯阶段形成的氧化铁皮进入粗轧，影响带钢表面质量。
一种无头连铸连轧生产超低碳钢卷的生产线，包括沿轧制方向顺次设置的连铸机1、粗轧机组3、剪切推废装置、加热装置9、精轧机组11、层流冷却装置12、高速飞剪13和卷取机组14，粗轧机组3与剪切推废装置6之间设有中间坯补温装置4以对中间坯补温，使中间坯进入下游加热装置时的表面温度高于奥氏体向铁素体转变的开始温度Ar 3。
理论上，粗轧机组3可选择4架以上粗轧机。从经济性的角度考虑，粗轧机组3宜选择4架，精轧机组11宜选择5架。
还可以在连铸机1与粗轧机组3之间设置粗除鳞装置2，在加热装置与精轧机组11之间设置精除鳞装置10，以提高带钢103的表面质量。粗除鳞装置2和精除鳞装置10宜采用高 压水除鳞装置。
中间坯补温装置4和加热装置9可为感应加热装置或烟气加热装置，优选感应加热装置，感应加热装置的布置方便，且温度调控灵活。
剪切推废装置可由沿轧制方向顺次设置的摆剪5和推废装置6组成，也可由沿轧制方向顺次设置的摆剪5、推废装置6、转鼓剪7和垛板移除装置8组成，后者便于事故处理。沿轧制方向，推废装置6的长度为10m～12m，垛板移除装置8的长度为2.5m～4m。
实施例1
一种无头连铸连轧生产超低碳钢卷的生产线，包括依次连接的连铸机1、高压水粗除鳞装置2、粗轧机组3、中间坯补温装置4、摆剪5、推废装置6、转鼓剪7、垛板移除装置8、感应加热装置9、高压水精除鳞装置10、精轧机组11、层流冷却装置12、高速飞剪13、卷取机组14。其中粗除鳞压力为10MPa～20MPa，粗轧机组采用4架轧机，中间坯补温装置4优选2～3组感应加热装置，推废装置6的长度沿轧制方向约为11m，垛板移除装置8沿轧制方向约为3m。
基于该生产线的典型生产工艺如下：
超低碳带钢成分：
质量百分比为：C≤0.02％、Mn≤0.1％、Si≤0.05％、P≤0.02％、S≤0.003％、Alt≤0.04％、余量为Fe。
实验测得，该成分下的奥氏体向铁素体转变温度Ar 3在1℃/s～5℃/s冷速下为880℃～890℃。
连续浇铸成连续的1250mm宽×105mm厚的铸坯101，连铸拉速5.5m/min，而后经过粗除鳞和4架粗轧机组，变为厚度为6mm的中间坯102，再运行至精轧机组，轧制成厚度为0.7mm的带钢103，再由高速飞剪切分，最后卷取机成卷。
按照上述工艺，产线各位置的带钢温度见表1，为说明本发明的特点，特将同设备参数及产线布置间距下，没有中间坯补温情况下的温度也列出以对比。
表1工艺温度对比
Figure PCTCN2022124555-appb-000001
Figure PCTCN2022124555-appb-000002
由表1可知，无中间坯补温情况下，投用粗除鳞，经过4架粗轧机，厚度为6mm的中间坯在感应加热装置9的入口处温度已经降到了超低碳钢相变温度Ar 3以下，会发生奥氏体向铁素体的相变。
由于在粗轧末机架R4和摆剪5之间增加了中间坯补温装置4，可以有效补偿由于粗除鳞装置2的投用和增加1架粗轧机带来的额外中间坯温降，使得中间坯由粗轧末机架R4至感应加热装置9的入口处，始终处于超低碳钢Ar 3相变点之上，即完全奥氏体区，从而抑制了先相变，后再逆相变的混晶组织和性能风险，从工艺温度控制角度来看更为合理。同时，也为轧制更薄带钢所需的更薄中间坯，更高表面质量带钢所需的粗除鳞创造了工艺条件。另外，由于针对现有技术进行局部优化，因此本发明实施的可行性较高。
最后说明的是，以上实施例仅用以说明本发明的技术方案而非限制，尽管参照较佳实施例对本发明进行了详细说明，本领域的普通技术人员应当理解，可以对本发明的技术方案进行修改或者等同替换，而不脱离本技术方案的宗旨和范围，其均应涵盖在本发明的权利要求范围当中。

Claims (20)

  1. 一种无头连铸连轧生产超低碳钢卷的方法，包括以下步骤：连铸、粗轧、切头、加热、精轧、层流冷却、分切、卷取成卷；其特征在于：在粗轧后进行中间坯补温，以使中间坯进入下游加热装置时的表面温度高于奥氏体向铁素体转变的开始温度Ar 3。
  2. 根据权利要求1所述的一种无头连铸连轧生产超低碳钢卷的方法，其特征在于：中间坯补温的补温温度T根据上游的粗轧机组的粗轧机的数量n确定，T≥k(n-3)+t，其中，k为单架粗轧机的温降，t∈[0，40℃]。
  3. 根据权利要求2所述的一种无头连铸连轧生产超低碳钢卷的方法，其特征在于：当粗轧前进行粗除鳞时，t∈[30℃，40℃]。
  4. 根据权利要求1所述的一种无头连铸连轧生产超低碳钢卷的方法，其特征在于：粗轧采用至少4架粗轧机进行轧制。
  5. 根据权利要求1所述的一种无头连铸连轧生产超低碳钢卷的方法，其特征在于：粗轧前采用10MPa～20MPa的高压水进行粗除鳞。
  6. 根据权利要求1所述的一种无头连铸连轧生产超低碳钢卷的方法，其特征在于：粗轧后的中间坯在进入下游摆剪前补温不低于40℃。
  7. 根据权利要求1所述的一种无头连铸连轧生产超低碳钢卷的方法，其特征在于：铸坯表面在连铸机的出口处温度为980℃～1000℃；中间坯表面在粗轧末机架的出口处温度为900℃～920℃，在位于摆剪后的加热装置的入口处温度大于890℃。
  8. 根据权利要求1所述的一种无头连铸连轧生产超低碳钢卷的方法，其特征在于：连铸坯厚度为95mm～115mm，宽度为900mm～1600mm，粗轧后中间坯厚度为6mm～20mm，精轧后带钢厚度0.6mm～4mm。
  9. 根据权利要求1所述的一种无头连铸连轧生产超低碳钢卷的方法，其特征在于：连铸拉速为4.0m/min～6.0m/min。
  10. 根据权利要求1所述的一种无头连铸连轧生产超低碳钢卷的方法，其特征在于：超低碳钢的成分为C≤0.02％，Si≤0.05％，Mn≤0.1％，P≤0.02％，S≤0.003％，Alt≤0.04％。
  11. 一种无头连铸连轧生产超低碳钢卷的生产线，包括沿轧制方向顺次设置的连铸机、粗轧机组、剪切推废装置、加热装置、精轧机组、层流冷却装置、高速飞剪和卷取机组，其特征在于：粗轧机组与剪切推废装置之间设有中间坯补温装置以对中间坯补温，使中间坯进入下游加热装置时的表面温度高于奥氏体向铁素体转变的开始温度Ar 3。
  12. 根据权利要求11所述的一种无头连铸连轧生产超低碳钢卷的生产线，其特征在于：所述粗轧机组包括至少4架粗轧机。
  13. 根据权利要求11所述的一种无头连铸连轧生产超低碳钢卷的生产线，其特征在于：所述连铸机与粗轧机组之间设有粗除鳞装置。
  14. 根据权利要求13所述的一种无头连铸连轧生产超低碳钢卷的生产线，其特征在于：所述加热装置与精轧机组之间设有精除鳞装置。
  15. 根据权利要求14所述的一种无头连铸连轧生产超低碳钢卷的生产线，其特征在于：所述粗除鳞装置和/或精除鳞装置为高压水除鳞装置。
  16. 根据权利要求11所述的一种无头连铸连轧生产超低碳钢卷的生产线，其特征在于：所述中间坯补温装置和加热装置为感应加热装置或烟气加热装置。
  17. 根据权利要求11所述的一种无头连铸连轧生产超低碳钢卷的生产线，其特征在于：所述剪切推废装置包括沿轧制方向顺次设置的摆剪、推废装置、转鼓剪和垛板移除装置。
  18. 根据权利要求17所述的一种无头连铸连轧生产超低碳钢卷的生产线，其特征在于：沿轧制方向，推废装置的长度为10m～12m。
  19. 根据权利要求17所述的一种无头连铸连轧生产超低碳钢卷的生产线，其特征在于：沿轧制方向，垛板移除装置的长度为2.5m～4m。
  20. 根据权利要求11所述的一种无头连铸连轧生产超低碳钢卷的生产线，其特征在于：所述精轧机组包括5架精轧机。
PCT/CN2022/124555 2022-08-24 2022-10-11 一种无头连铸连轧生产超低碳钢卷的方法及生产线 WO2024040707A1 (zh)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN202211018597.3A CN115351081A (zh) 2022-08-24 2022-08-24 一种无头连铸连轧生产超低碳钢卷的方法及生产线
CN202211018597.3 2022-08-24

Publications (1)

Publication Number Publication Date
WO2024040707A1 true WO2024040707A1 (zh) 2024-02-29

Family

ID=84005199

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/CN2022/124555 WO2024040707A1 (zh) 2022-08-24 2022-10-11 一种无头连铸连轧生产超低碳钢卷的方法及生产线

Country Status (2)

Country Link
CN (1) CN115351081A (zh)
WO (1) WO2024040707A1 (zh)

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1186003A (zh) * 1996-11-28 1998-07-01 Sms舒路曼-斯玛公司 热轧设备
EP0904861A1 (en) * 1997-09-11 1999-03-31 Nkk Corporation Method of producing thin hot rolled steel sheet, and apparatus to carry out the method
KR20140085188A (ko) * 2012-12-27 2014-07-07 주식회사 포스코 열연강판 제조방법 및 이를 이용한 열연강판
CN112024595A (zh) * 2020-09-07 2020-12-04 中冶赛迪工程技术股份有限公司 一种薄带钢连铸连轧无头轧制方法及其轧制生产线
CN114173957A (zh) * 2019-07-24 2022-03-11 首要金属科技奥地利有限责任公司 在铸轧复合设备中可深冲的钢带的制造
CN114273425A (zh) * 2021-12-13 2022-04-05 中冶赛迪工程技术股份有限公司 一种避免铁素体轧制混晶的连铸连轧生产线及生产方法

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1186003A (zh) * 1996-11-28 1998-07-01 Sms舒路曼-斯玛公司 热轧设备
EP0904861A1 (en) * 1997-09-11 1999-03-31 Nkk Corporation Method of producing thin hot rolled steel sheet, and apparatus to carry out the method
KR20140085188A (ko) * 2012-12-27 2014-07-07 주식회사 포스코 열연강판 제조방법 및 이를 이용한 열연강판
CN114173957A (zh) * 2019-07-24 2022-03-11 首要金属科技奥地利有限责任公司 在铸轧复合设备中可深冲的钢带的制造
CN112024595A (zh) * 2020-09-07 2020-12-04 中冶赛迪工程技术股份有限公司 一种薄带钢连铸连轧无头轧制方法及其轧制生产线
CN114273425A (zh) * 2021-12-13 2022-04-05 中冶赛迪工程技术股份有限公司 一种避免铁素体轧制混晶的连铸连轧生产线及生产方法

Also Published As

Publication number Publication date
CN115351081A (zh) 2022-11-18

Similar Documents

Publication Publication Date Title
CN108526221A (zh) 一种低碳钢连铸连轧生产线及其生产工艺
CN101391264B (zh) 一种薄中板连铸连轧生产的工艺方法
JP4677097B2 (ja) 熱間圧延薄板製品をエンドレス製造するための生産方法及び生産設備
JPH07308701A (ja) 連鋳直結熱間圧延設備およびその圧延方法
WO1993023182A1 (en) Method and apparatus for intermediate thickness slab caster and inline hot strip and plate line
WO1993023182A9 (en) Method and apparatus for intermediate thickness slab caster and inline hot strip and plate line
TW200927313A (en) Method and apparatus for producing strips of silicon steel or multi-phase steel
JP2010531734A (ja) 効率的且省エネルギーな帯鋼連続鋳造及び連続圧延プロセス
CN114273425B (zh) 一种避免铁素体轧制混晶的连铸连轧生产线及生产方法
CN111589865B (zh) 一种低屈强比薄带钢连铸连轧生产线及生产工艺
CN108994081B (zh) 一种在esp生产线采用铁素体轧制生产低碳钢的方法
JPH0446601A (ja) 熱間薄板製造設備及び製造方法
CN109433826A (zh) 中薄板坯连铸连轧机组及其生产方法
JP2012213807A (ja) 効率的且省エネルギーな帯鋼連続鋳造及び連続圧延プロセス
CN109922904B (zh) 铸造-轧制-复合设备和用于连续地制造热轧的成品带钢的方法
CN109647884A (zh) 一种无头连铸连轧生产高质量中板的方法及装置
CN103572158A (zh) 一种无取向电工钢板及其生产方法
CN1978080A (zh) 一种带钢生产工艺－esp
CN209334441U (zh) 中薄板坯连铸连轧机组
CN112337968B (zh) 一种多功能热轧板带生产机组及其生产方法
CN209334440U (zh) 一种薄板坯连铸连轧机组
WO2024040707A1 (zh) 一种无头连铸连轧生产超低碳钢卷的方法及生产线
CN111842483B (zh) 一种多模式节能型热轧带钢生产线及其使用方法
CN103088253A (zh) 一种无取向电工钢板及其生产方法
CN210253551U (zh) 一种短流程长材无头轧制生产线

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 22956246

Country of ref document: EP

Kind code of ref document: A1