WO2020169076A1 - 一种降低双辊连铸产线轧机轧制力的方法 - Google Patents

一种降低双辊连铸产线轧机轧制力的方法 Download PDF

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WO2020169076A1
WO2020169076A1 PCT/CN2020/076117 CN2020076117W WO2020169076A1 WO 2020169076 A1 WO2020169076 A1 WO 2020169076A1 CN 2020076117 W CN2020076117 W CN 2020076117W WO 2020169076 A1 WO2020169076 A1 WO 2020169076A1
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production line
rolling
reducing
continuous casting
strip
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PCT/CN2020/076117
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English (en)
French (fr)
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刘新院
李化龙
周东升
施一新
刘俭
马毅
吴荣洲
李婷婷
李霞
陈爱华
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江苏沙钢集团有限公司
江苏省沙钢钢铁研究院有限公司
张家港中美超薄带科技有限公司
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Publication of WO2020169076A1 publication Critical patent/WO2020169076A1/zh

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    • 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
    • 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
    • B21B45/02—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 lubricating, cooling, or cleaning
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B9/00—Measures for carrying out rolling operations under special conditions, e.g. in vacuum or inert atmosphere to prevent oxidation of work; Special measures for removing fumes from rolling mills
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/06—Continuous casting of metals, i.e. casting in indefinite lengths into moulds with travelling walls, e.g. with rolls, plates, belts, caterpillars

Definitions

  • the invention relates to a method for reducing the rolling force of a double-roll continuous casting production line rolling mill with a short flow, low cost and thin specifications.
  • twin-roll cast-rolling strip steel is a new metallurgical frontier technology with the most development potential in today's steel industry. It is also a short process, low energy consumption, low investment, New technology with low cost and green environment.
  • the feature of the ultra-thin strip production line based on this technology is that liquid molten steel is injected into the molten pool formed by two casting rolls with opposite rotation directions through the flow distribution system to directly produce a casting strip with a thickness of less than 3mm, and then undergo a series of hot rolling to produce the thickness Hot rolled thin strip steel less than 2mm.
  • the double-roll continuous casting production line has achieved commercial production and can produce carbon steel, weathering steel, silicon steel and other products.
  • the cast strip passes through a secondary rolling mill with the thinnest rolling thickness of 0.7mm. The strip surface and edge quality are good.
  • the cast strip comes down from the cast roll, protected by an inert atmosphere, and the cast strip enters the rolling mill for rolling.
  • the temperature of the cast strip is relatively high, and the roll has been working at high temperature, which seriously affects the life of the roll.
  • the temperature of the cast strip cannot be reduced unlimitedly due to technological requirements. Therefore, how to reduce the rolling force during the rolling process to increase the life of the roll has become the primary method.
  • the most commonly used method to reduce the rolling force is to add rolling during the rolling process.
  • lubricate by controlling the amount of rolling oil added to reduce the rolling force, and increase the rolling lubrication by increasing the oxide film on the surface of the cast strip. This report has not been seen.
  • the invention invents a method for reducing the rolling force of the rolling mill in the double-roll continuous casting production line under the premise of ensuring the temperature of the casting strip.
  • the purpose of the present invention is to provide a method for reducing the rolling force of a rolling mill in a twin-roll continuous casting production line.
  • the method does not affect the temperature of the cast strip by passing a certain amount of nitrogen into the 3# hot box
  • an extremely thin oxide layer is formed on the surface of the strip, which increases the surface lubrication of the cast strip, reduces the rolling force during the rolling process, and prolongs the life of the roll.
  • the present invention adopts the following technical solutions.
  • a method for reducing the rolling force of a rolling mill in a twin-roll continuous casting production line comprising the following steps:
  • Qualified molten steel is smelted by a converter or an electric furnace, and then passes through a tundish, a transitional package and a counter-rotating copper casting roll to form a casting strip with a certain thickness;
  • the molten steel component may be carbon steel, weathering steel, stainless steel, or the like.
  • the molten steel passes through a pair of rotating casting rolls to form a cast strip, the continuous casting speed of which is less than or equal to 100 m/min, and the thickness of the formed cast strip is 1.4-2.2 mm.
  • the range of air passing through the upper surface is 10-1000 m 3 /h
  • the range of air passing through the lower surface of the casting belt is 10-1000 m 3 /h.
  • the amount of air passing through the upper and lower surfaces of the casting belt can be adjusted automatically or manually according to the speed of the production line.
  • the nitrogen content of 3# hot box is in the range of 5-150m 3 /h.
  • the amount of nitrogen introduced into the 3# hot box can be adjusted automatically or manually.
  • the cast strip is hot rolled into a 0.7-2.0 mm thick hot-rolled steel strip after one pass.
  • Figure 1 shows a schematic diagram of a twin-roll continuous casting production line.
  • Figure 2 shows a schematic diagram of the 3# hot box.
  • Carbon steel with qualified composition is smelted in a converter or electric furnace, and a pair of counter-rotating copper casting rolls form a continuous casting belt with a thickness of 1.8mm and a continuous casting speed of 60m/min;
  • the entire casting adopts gas-passing rolling to realize 5 furnaces of continuous casting, which is 2 more furnaces of continuous casting than non-gas rolling.
  • the stainless steel with qualified composition is smelted by the converter or electric furnace, and a pair of copper casting rolls that rotate in the opposite direction form a continuous casting belt with a thickness of 2.2mm and a continuous casting speed of 40m/min;
  • the weathering steel with qualified composition is smelted in a converter or electric furnace, and a pair of copper casting rolls that rotate in the opposite direction form a continuous casting belt with a thickness of 1.4mm and a continuous casting speed of 90m/min;

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

Abstract

一种降低双辊连铸产线轧机轧制力的方法。该方法包括经转炉或电炉冶炼成合格的钢水，经过中包、过渡包及反向旋转的铜铸辊，形成一定厚度的铸带；在双辊连铸产线的3#热箱里通入一定量的空气和一定量的氮气，并且上下表面可以独立控制空气含量，使铸带表面形成一层极薄的氧化层；热轧，之后冷却，卷取成卷。通过该方法，在铸带表面形成的氧化层增加了铸带表面润滑，降低了轧制力，延长了轧辊寿命。

Description

一种降低双辊连铸产线轧机轧制力的方法 技术领域
本发明涉及一种短流程、低成本、薄规格的降低双辊连铸产线轧机轧制力的方法。
背景技术
双辊铸轧带钢的生产技术，是当今钢铁工业最具发展潜力的一项冶金前沿新技术，也是世界各大钢铁企业纷纷投入巨资竞相开发的一种短流程、低能耗、投资省、成本低和绿色环保的新工艺。基于该技术的超薄带生产线特点为液态钢水通过布流***注入旋转方向相反的两个铸辊形成的熔池中，直接生产出厚度小于3mm的铸带，再经一道次热轧生产出厚度小于2mm的热轧薄带钢。
目前，双辊连铸产线实现商业化生产，可生产碳钢、耐候钢、硅钢等产品，铸带经过一道次轧机，最薄轧制厚度为0.7mm，带钢表面及边部质量良好。
实际生产中，铸带从铸辊下来，经过惰性气氛保护，铸带进入轧机进行轧制，铸带温度比较高，轧辊一直在高温下进行工作，严重影响了轧辊寿命，延长轧辊寿命有两个措施，一是降低铸带温度；二是降低轧制时的轧制力。铸带温度由于工艺要求，不能进行无限制的降低，因此如何在轧制过程中降低轧制力以增加轧辊寿命成为了首要方法，降低轧制力最常用的方法为在轧制过程中加入轧制润滑油，通过控制加入轧制油量进行润滑以降低轧制力，通过增加铸带表面氧化膜，以增加轧制润滑，未见到此报道。
本发明针对双辊连铸产线在保证铸带温度的前提下，发明了一种用于双辊连铸产线降低轧机轧制力的方法。
发明内容
本发明的目的是为了提供了一种用于双辊连铸产线降低轧机轧制力的方法，该方法在不影响铸带温度的前提下，通过向3#热箱通入一定量的氮 气及空气，在带钢表面形成一层极薄的氧化层，增加了铸带表面润滑，降低了轧制过程中的轧制力，延长了轧辊寿命。
为实现上述技术目的，本发明采取如下技术方案。
一种降低双辊连铸产线轧机轧制力的方法，该方法包括如下步骤：
(1)经转炉或电炉冶炼成合格的钢水，经过中包、过渡包及反向旋转的铜铸辊，形成一定厚度的铸带；
(2)在铸机和轧机之间的3#热箱中，通入一定量的氮气，同时通入一定量的空气，并且铸带上下表面的空气可以独立控制含量；
(3)带钢经过一道次热轧，轧制成一定厚度带钢；
(4)带钢热轧后经过冷却，卷取成卷。
优选地，钢水成分可以为碳钢、耐候钢或不锈钢成分等。
优选地，钢水经过一对旋转铸辊形成铸带，其连铸速度小于等于100m/min，形成的铸带厚度为1.4-2.2mm。
优选地，上表面通入的空气范围为10-1000m 3/h，铸带下表面通入空气的范围为10-1000m 3/h。
优选地，铸带上下表面通入空气的量可以根据产线的速度去自动调整或者手动进行调整。
优选地，3#热箱通入的氮气含量范围为5-150m 3/h。
优选地，3#热箱通入的氮气量可以进行自动控制调节或者手动控制调节。
优选地，铸带经过一道次热轧轧制成0.7-2.0mm厚的热轧带钢。
有益技术效果
本发明的有益技术效果至少在于：
在3#热箱加入一定量的空气，铸带表面形成一层极薄的氧化膜，这层氧化膜可以起到很好的润滑作用，降低了轧制力，延长了轧辊寿命。
附图说明
为了更清楚地说明本发明的实施例的技术方案，下面将对实施例的附图作简单的介绍。显而易见地，下面描述中的附图仅仅涉及本发明的一些 实施例，而非对本发明的限制。
图1示出了双辊连铸生产线的示意图。
图2示出了3#热箱的示意图。
具体实施方式
为了使本发明实施例的目的、技术方案和优点更加清楚，下面将对本发明实施例的技术方案进行清楚、完整地描述。显然，所描述的实施例是本发明的一部分实施例，而不是全部的实施例。基于所描述的本发明的实施例，本领域普通技术人员在无需创造性劳动的前提下所获得的所有其他实施例，都属于本发明保护的范围。
除非另作定义，本公开所使用的技术术语或科学术语应当为本发明所属领域内具有一般技能的人士所理解的通常意义。
下面对本发明予以详细描述。
实施例1
(1)经转炉或电炉冶炼成分合格的碳钢，经过反向旋转的一对铜铸辊形成连续铸带，铸带厚度为1.8mm，连铸速度为60m/min；
(2)铸带经过3#热箱，上表面通入10m 3/h空气，下表面通入1000m 3/h空气，3#热箱通入5m 3/h氮气；
(3)轧机轧制1.5mm规格，通气体后，轧制力由6MN降低至5MN；
(4)整个浇铸采用通入气体轧制，实现5炉连浇，比不通入气体轧制，多了2炉连浇。
实施例2
(1)经转炉或电炉冶炼成分合格的不锈钢，经过反向旋转的一对铜铸辊形成连续铸带，铸带厚度为2.2mm，连铸速度为40m/min；
(2)铸带经过3#热箱，上表面通入1000m 3/h空气，下表面通入10m 3/h空气，3#热箱通入70m 3/h氮气；
(3)轧机轧制2.0mm规格，通气体后，轧制力由4.5MN降低至4MN；
(4)整个浇铸采用通入气体轧制，实现6炉连浇，比不通入气体轧制， 多了2.5炉连浇。
实施例3
(1)经转炉或电炉冶炼成分合格的耐候钢，经过反向旋转的一对铜铸辊形成连续铸带，铸带厚度为1.4mm，连铸速度为90m/min；
(2)铸带经过3#热箱，上表面通入300m 3/h空气，下表面通入100m 3/h空气，3#热箱通入150m 3/h氮气；
(3)轧机轧制0.7mm规格，通气体后，轧制力由23MN降低至21MN；
(4)整个浇铸采用通入气体轧制，实现3炉连浇，比不通入气体轧制，多了1.5炉连浇。
以上所述仅是本发明的示范性实施方式，而非用于限制本发明的保护范围，本发明的保护范围由所附的权利要求确定。

Claims (8)

  1. 一种降低双辊连铸产线轧机轧制力的方法，其特征在于，所述生产方法包括如下步骤：
    (1)经转炉或电炉冶炼成合格的钢水，经过中包、过渡包及反向旋转的铜铸辊，形成一定厚度的铸带；
    (2)在铸机和轧机之间的3#热箱中，通入一定量的氮气，同时通入一定量的空气，并且对铸带上下表面的空气进行独立控制含量；
    (3)带钢经过一道次热轧，轧制成一定厚度带钢；
    (4)带钢热轧后经过冷却，卷取成卷。
  2. 如权利要求1所述的降低双辊连铸产线轧机轧制力的方法，其特征在于：钢水成分可以为碳钢、耐候钢或不锈钢成分等。
  3. 如权利要求1或权利要求2所述的降低双辊连铸产线轧机轧制力的方法，其特征在于：钢水经过一对旋转铸辊形成铸带，其连铸速度小于等于90m/min，形成的铸带厚度为1.4-2.2mm。
  4. 如前述权利要求中的任意一项所述的降低双辊连铸产线轧机轧制力的方法，其特征在于：铸带上表面通入的空气范围为10-1000m 3/h，下表面通入空气的范围为10-1000m 3/h。
  5. 如前述权利要求中的任意一项所述的降低双辊连铸产线轧机轧制力的方法，其特征在于：可以根据产线的速度去自动调整或者手动进行调整铸带上下表面通入空气的量。
  6. 如前述权利要求中的任意一项所述的降低双辊连铸产线轧机轧制力的方法，其特征在于：3#热箱通入的氮气含量范围为5-150m 3/h。
  7. 如前述权利要求中的任意一项所述的降低双辊连铸产线轧机轧制力的方法，其特征在于：3#热箱通入的氮气量可以进行自动控制调节或者手动控制调节。
  8. 如前述权利要求中的任意一项所述的降低双辊连铸产线轧机轧制力的方法，其特征在于：铸带经过一道次热轧轧制成0.7-2.0mm厚的热轧带 钢。
PCT/CN2020/076117 2019-02-21 2020-02-21 一种降低双辊连铸产线轧机轧制力的方法 WO2020169076A1 (zh)

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CN111014603B (zh) * 2019-12-30 2022-02-25 江苏沙钢集团有限公司 加硼钢的双辊铸轧生产方法
CN111151584A (zh) * 2019-12-30 2020-05-15 江苏沙钢集团有限公司 无需在线除鳞的生产高表面质量热轧带钢所需的新型热箱
CN112296285B (zh) * 2020-09-18 2022-04-05 江苏沙钢集团有限公司 一种改善双辊铸轧薄带褶皱的方法
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