CN114799099A - Method for improving molten steel wettability on surface of thin strip continuous casting roller - Google Patents
Method for improving molten steel wettability on surface of thin strip continuous casting roller Download PDFInfo
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 87
- 239000010959 steel Substances 0.000 title claims abstract description 87
- 238000000034 method Methods 0.000 title claims abstract description 18
- 238000009749 continuous casting Methods 0.000 title claims abstract description 17
- 238000005266 casting Methods 0.000 claims abstract description 123
- 229910052751 metal Inorganic materials 0.000 claims abstract description 43
- 239000002184 metal Substances 0.000 claims abstract description 42
- 239000011669 selenium Substances 0.000 claims abstract description 42
- BUGBHKTXTAQXES-UHFFFAOYSA-N Selenium Chemical compound [Se] BUGBHKTXTAQXES-UHFFFAOYSA-N 0.000 claims abstract description 15
- 229910052711 selenium Inorganic materials 0.000 claims abstract description 15
- 238000009736 wetting Methods 0.000 claims description 19
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 12
- 239000011572 manganese Substances 0.000 claims description 12
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 6
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 claims description 6
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 6
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 claims description 6
- 229910052799 carbon Inorganic materials 0.000 claims description 6
- 229910052748 manganese Inorganic materials 0.000 claims description 6
- 229910052757 nitrogen Inorganic materials 0.000 claims description 6
- 229910052710 silicon Inorganic materials 0.000 claims description 6
- 239000010703 silicon Substances 0.000 claims description 6
- 229910052717 sulfur Inorganic materials 0.000 claims description 5
- 239000011593 sulfur Substances 0.000 claims description 5
- 239000005864 Sulphur Substances 0.000 claims 1
- 238000004519 manufacturing process Methods 0.000 description 16
- 238000001816 cooling Methods 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 3
- 239000007788 liquid Substances 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 238000007711 solidification Methods 0.000 description 3
- 230000008023 solidification Effects 0.000 description 3
- 230000007704 transition Effects 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 2
- 238000010924 continuous production Methods 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000003068 static effect Effects 0.000 description 2
- 241001391944 Commicarpus scandens Species 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000005098 hot rolling Methods 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 230000008595 infiltration Effects 0.000 description 1
- 238000001764 infiltration Methods 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
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- 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
- B22D11/0622—Continuous casting of metals, i.e. casting in indefinite lengths into moulds with travelling walls, e.g. with rolls, plates, belts, caterpillars formed by two casting wheels
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- 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
- B22D11/16—Controlling or regulating processes or operations
- B22D11/18—Controlling or regulating processes or operations for pouring
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/001—Ferrous alloys, e.g. steel alloys containing N
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/004—Very low carbon steels, i.e. having a carbon content of less than 0,01%
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/60—Ferrous alloys, e.g. steel alloys containing lead, selenium, tellurium, or antimony, or more than 0.04% by weight of sulfur
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- Mechanical Engineering (AREA)
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- Organic Chemistry (AREA)
- Continuous Casting (AREA)
Abstract
本发明公开了一种提高薄带连铸铸辊表面钢水浸润性的方法，包括以下步骤：熔融金属流至双辊连铸机的一对铸辊，并在一对铸辊之间的辊隙上方、铸辊的铸造表面之上形成熔池，其中，熔池中熔融金属中硒(Se)含量按重量百分比计≥0.005％，并且熔池中熔融金属的温度≥1550℃，一对铸辊相对旋转，熔池中的熔融金属在铸辊的铸造表面上冷却凝固、并向下穿过一对铸辊之间的辊隙形成钢带，其中，铸辊的旋转线速度≤0.8m/s。本发明还提供了一种根据前述方法生产的薄带钢。
The invention discloses a method for improving the wettability of molten steel on the surface of thin strip continuous casting rolls. A molten pool is formed above and on the casting surface of the casting roll, wherein the content of selenium (Se) in the molten metal in the molten pool is ≥ 0.005% by weight, and the temperature of the molten metal in the molten pool is ≥ 1550 ° C, a pair of casting rolls Relatively rotating, the molten metal in the molten pool cools and solidifies on the casting surface of the casting rolls, and passes down through the nip between a pair of casting rolls to form a steel strip, wherein the rotational speed of the casting rolls is ≤0.8m/s . The present invention also provides a thin strip produced according to the aforementioned method.
Description
技术领域technical field
本发明属于薄带连铸领域，特别地涉及一种提高薄带连铸铸辊表面钢水浸润性的方法。The invention belongs to the field of thin-strip continuous casting, and particularly relates to a method for improving the wettability of molten steel on the surface of casting rolls of thin-strip continuous casting.
背景技术Background technique
薄带连铸技术是一种新型的薄带钢生产工艺，通过采用双辊连铸机，其钢水浇铸过程在熔池中完成，熔池由一对相对旋转的铸辊和侧封板共同包围而成，熔融金属被引入该对铸辊之间，使得金属在旋转的铸辊表面冷却凝固成带，并且在铸辊之间的辊隙向下连续传送固化的钢带产品。Thin strip continuous casting technology is a new type of thin strip steel production process. By using a twin-roll continuous casting machine, the molten steel casting process is completed in the molten pool, and the molten pool is surrounded by a pair of relatively rotating casting rolls and side sealing plates. Thus, molten metal is introduced between the pair of casting rolls, allowing the metal to cool and solidify into a strip on the surfaces of the rotating casting rolls, and the solidified steel strip product is continuously conveyed down the nip between the casting rolls.
与传统热轧工艺相比，薄带连铸技术具有生产工序简单、能耗小、产品成本低等优点。但是，该技术目前也存在一定的瓶颈，主要在熔融金属能否连续稳定成带以及成带厚度是否均匀。如果熔融金属不能连续稳定成带、或成带厚度波动都容易导致断带停浇，致使无法实现连续生产，进而将影响生产效率和产品质量，并导致成本提高。Compared with the traditional hot rolling process, the thin strip continuous casting technology has the advantages of simple production process, low energy consumption and low product cost. However, this technology also has certain bottlenecks at present, mainly in whether the molten metal can be continuously and stably formed into strips and whether the thickness of the strips is uniform. If the molten metal cannot be continuously and stably formed into strips, or the thickness of the strips fluctuates, it is easy to cause the strip to be broken and stop pouring, making it impossible to achieve continuous production, which will affect production efficiency and product quality, and lead to increased costs.
发明内容SUMMARY OF THE INVENTION
本发明提供了一种有利的技术方案，能够改善铸辊表面的钢水浸润性，进而提供了铸造的连续性和稳定性。The present invention provides an advantageous technical solution, which can improve the wettability of molten steel on the surface of the casting roll, thereby providing continuity and stability of casting.
具体来说，本发明通过在熔融金属中添加Se元素、和通过控制熔融金属的温度来减小钢水表面张力，并通过控制铸辊旋转线速度以减小熔融金属在铸辊表面的波动，从而提高熔融金属在铸辊表面的浸润性。熔融金属的良好的浸润性能够使得，熔融金属在铸辊表面贴合较好、冷却均匀，凝固坯壳厚度均匀且稳定，进而成带稳定且钢带厚度均匀，不容易发生断带停浇事故，可实现连续生产，提高生产效率和产品质量，并降低产品成本。Specifically, the present invention reduces the surface tension of molten steel by adding Se element to the molten metal and controlling the temperature of the molten metal, and reduces the fluctuation of the molten metal on the surface of the casting roll by controlling the rotational speed of the casting roll, thereby reducing the surface tension of the molten metal. Improve the wettability of molten metal on the surface of casting rolls. The good wettability of the molten metal can make the molten metal adhere well on the surface of the casting roll, the cooling is uniform, the thickness of the solidified shell is uniform and stable, and the strip is stable and the thickness of the steel strip is uniform. , can achieve continuous production, improve production efficiency and product quality, and reduce product costs.
本发明公开了一种改善的生产薄带钢的方法，包括以下步骤：熔融金属流至双辊连铸机的一对铸辊，并在一对铸辊之间的辊隙上方、铸辊的铸造表面之上形成熔池，其中，熔池中熔融金属中硒(Se)含量按重量百分比计≥0.005％，并且熔池中熔融金属的温度≥1550℃，一对铸辊相对旋转，熔池中的熔融金属在铸辊的铸造表面上冷却凝固、并向下穿过一对铸辊之间的辊隙形成钢带，其中，铸辊的旋转线速度≤0.8m/s。本发明还提供了一种根据前述方法生产的薄带钢。The present invention discloses an improved method for producing thin strip steel, comprising the steps of: molten metal flows to a pair of casting rolls of a twin roll continuous casting machine, and above the roll gap between the pair of casting rolls, the A molten pool is formed on the casting surface, wherein the content of selenium (Se) in the molten metal in the molten pool is greater than or equal to 0.005% by weight, and the temperature of the molten metal in the molten pool is greater than or equal to 1550°C, a pair of casting rolls rotate relatively, and the molten pool The molten metal in the casting rolls cools and solidifies on the casting surface of the casting rolls, and passes down through the nip between a pair of casting rolls to form a steel strip, wherein the rotating linear speed of the casting rolls is ≤ 0.8 m/s. The present invention also provides a thin strip produced according to the aforementioned method.
在优选的方案中，硒(Se)的含量按照重量百分比计在0.005％～0.01％的范围内。In a preferred solution, the content of selenium (Se) is in the range of 0.005% to 0.01% by weight.
在优选的方案中，熔池中熔融金属的温度在1550℃～1570℃的范围内。In a preferred solution, the temperature of the molten metal in the molten pool is in the range of 1550°C to 1570°C.
在优选的方案中，熔融金属在所述铸辊表面形成的浸润角小于80°。In a preferred solution, the wetting angle formed by the molten metal on the surface of the casting roll is less than 80°.
在优选的方案中，熔池中熔融金属中还包括按重量计：不超过0.03％的碳(C)，不超过0.5％的硅(Si)，不超过0.2％的锰(Mn)，不超过0.005％的氮(N)，不超过0.005％的硫(S)。In a preferred solution, the molten metal in the molten pool also includes by weight: no more than 0.03% carbon (C), no more than 0.5% silicon (Si), no more than 0.2% manganese (Mn), no more than 0.2% 0.005% nitrogen (N), not to exceed 0.005% sulfur (S).
本发明还提供了一种通过双辊连铸机生产的薄带钢，包括按重量计：不超过0.03％的碳(C)，不超过0.5％的硅(Si)，不超过0.2％的锰(Mn)，不超过0.005％的氮(N)，不超过0.005％的硫(S)，以及不低于0.005％的硒(Se)。优选地，硒(Se)的含量按照重量百分比计在0.005％～0.01％的范围内。该薄带钢中添加的硒(Se)使得，在浇铸过程中，钢水能够以改善的浸润角在铸辊表面冷却凝固，形成的薄带钢能形成较长的连续长度，且带厚度均匀、波动较小。The present invention also provides a thin strip produced by a twin roll caster, comprising by weight: not more than 0.03% carbon (C), not more than 0.5% silicon (Si), not more than 0.2% manganese (Mn), not more than 0.005% nitrogen (N), not more than 0.005% sulfur (S), and not less than 0.005% selenium (Se). Preferably, the content of selenium (Se) ranges from 0.005% to 0.01% by weight. The selenium (Se) added to the thin strip allows the molten steel to cool and solidify on the surface of the casting roll with an improved wetting angle during the casting process, and the thin strip formed can form a long continuous length with uniform thickness and Less volatility.
本发明的方法改善了薄带连铸钢水在铸辊表面的浸润性，具体在于：The method of the present invention improves the wettability of the thin strip continuous casting molten steel on the surface of the casting roll, specifically:
(1)熔炼钢水中Se含量按重量百分比计≥0.005％；钢水中加入Se元素可以有效减小钢水的表面张力，且Se含量越高，钢水表面张力越小，钢水在铸辊表面的浸润角越小，浸润性越好；本发明为了使得钢水在铸辊表面的浸润角小于90°、优选小于80°，Se含量按重量百分比需要≥0.005％，但考虑到本领域钢水纯净性的要求，Se含量也不能无限增加，一般选择≤0.01％。(1) Se content in molten steel is ≥0.005% by weight; adding Se element in molten steel can effectively reduce the surface tension of molten steel, and the higher the Se content, the smaller the surface tension of molten steel, and the wetting angle of molten steel on the surface of the casting roll. The smaller, the better the wettability; in order to make the wetting angle of molten steel on the surface of the casting roll less than 90°, preferably less than 80°, the Se content needs to be ≥0.005% by weight, but considering the requirements of the purity of molten steel in this field, Se content can not be increased infinitely, generally choose ≤0.01%.
(2)钢水经中间包、过渡包流入熔池，控制熔池中钢水温度≥1550℃；钢水温度越高，钢水表面张力越小，钢水在铸辊表面的浸润角越小，浸润性越好，本发明为了使得钢水在铸辊表面的浸润角小于90°、优选小于80°，钢水温度≥1550℃，但钢水温度过高会直接导致钢水在铸辊表面无法凝固成带，因此钢水温度一般不超过1570℃。(2) The molten steel flows into the molten pool through the tundish and transition ladle, and the temperature of molten steel in the molten pool is controlled to be ≥1550 °C; Well, in the present invention, in order to make the wetting angle of molten steel on the surface of the casting roll less than 90°, preferably less than 80°, the temperature of the molten steel is greater than or equal to 1550° C. However, if the temperature of the molten steel is too high, the molten steel cannot be solidified directly on the surface of the casting roll. Generally not more than 1570 ℃.
(3)控制铸辊旋转线速度≤0.8m/s。铸辊的旋转会影响钢水在铸辊表面的稳定性，进而影响浸润性。一般的，铸辊运动越慢，钢水在其表面浸润性越好，所以铸辊理想状态是静止，但考虑到薄带铸轧工艺要求，铸辊必须不间断的旋转以便将钢带带离熔池，因此铸辊不能保持静止。综合考虑，本发明控制铸辊旋转线速度≤0.8m/s。(3) Control the rotational speed of the casting rolls ≤0.8m/s. The rotation of the casting rolls affects the stability of the molten steel on the surface of the casting rolls, which in turn affects the wettability. In general, the slower the movement of the casting roll, the better the wettability of molten steel on its surface, so the ideal state of the casting roll is static, but considering the thin strip casting and rolling process requirements, the casting roll must rotate uninterruptedly to remove the strip from the molten steel. pool, so the casting rolls cannot remain stationary. Considering comprehensively, the present invention controls the rotational linear speed of the casting roll to be ≤0.8m/s.
按本发明的一种提高薄带连铸铸辊表面钢水浸润性的方法，可得到钢水在铸辊表面形成的浸润角小于90°、优选小于80°。According to the method for improving the wettability of molten steel on the surface of the thin strip continuous casting roll of the present invention, the wetting angle formed by the molten steel on the surface of the casting roll is less than 90°, preferably less than 80°.
有益技术效果beneficial technical effect
通过本发明的方法可以实现提高薄带连铸时铸辊表面钢水浸润性，浸润角小于90°、优选小于80°，使得钢水在铸辊表面贴合较好，冷却均匀，凝固成带稳定且厚度均匀，不易发生断带，提高了生产连续性，改善了产品质量，并降低了生产成本。Through the method of the invention, the wettability of molten steel on the surface of the casting roll during continuous casting of thin strips can be improved, and the wetting angle is less than 90°, preferably less than 80°, so that the molten steel fits well on the surface of the casting roll, the cooling is uniform, and the solidified strip is stable and stable. The thickness is uniform, the belt is not easy to be broken, the production continuity is improved, the product quality is improved, and the production cost is reduced.
附图说明Description of drawings
为了更清楚地介绍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，下面描述中的附图仅仅涉及本发明的一些实施案例，而非对本发明的限制。In order to introduce the technical solutions of the embodiments of the present invention more clearly, the accompanying drawings of the embodiments will be briefly introduced below. Obviously, the accompanying drawings in the following description only relate to some implementation cases of the present invention, rather than limiting the present invention.
图1是本发明的双辊连铸机系统的示意性侧视图；Figure 1 is a schematic side view of the twin roll caster system of the present invention;
图2是通过图1的双辊连铸机的铸造位置中安装到辊匣内的铸辊的部分剖视图。FIG. 2 is a partial cross-sectional view through the casting rolls of the twin roll caster of FIG. 1 installed into the roll cassettes in the casting position.
具体实施方式Detailed ways
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。In order to make the objectives, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be described clearly and completely below. Obviously, the described embodiments are some, but not all, embodiments of the present invention. Based on the described embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present invention.
除非另作定义，本发明所使用的技术术语或科学术语应当为本发明所属领域具有一般技能的人士所理解的通常意义。Unless otherwise defined, technical or scientific terms used in the present invention should have the ordinary meaning as understood by one of ordinary skill in the art to which this invention belongs.
下面为本发明实施例，所描述的实施例仅仅是本发明的一部分实施例，基于本发明的实施例，本领域普通技术人员在没有做出创造性劳动的前提下所能够获得的所有其他实施例，都属于本发明保护的范围。The following are the embodiments of the present invention, and the described embodiments are only a part of the embodiments of the present invention. Based on the embodiments of the present invention, those of ordinary skill in the art can obtain all other embodiments without creative work. , all belong to the protection scope of the present invention.
现在参照图1和图2，示出双辊连铸机，其包括主机框架10，该主机框架10从地板竖立并支撑一对铸辊12，这对铸辊12安装在辊匣11中，以易于操作和运动。Referring now to Figures 1 and 2, there is shown a twin roll continuous caster comprising a main frame 10 erected from the floor and supporting a pair of
用于连续铸造薄金属带的双辊连铸机包括一对相对旋转的铸辊12，其分别具有铸造表面12A，其间形成辊隙18。熔融金属从钢包13通过中间包14，然后通过耐火的出口护罩15传送到过渡包16，并然后传送到定位在辊隙18之上、铸辊12之间的布流器17。如此传送的熔融金属形成支撑在辊隙上方、铸辊12的铸造表面12A之上的熔池19。A twin roll caster for continuously casting thin metal strip includes a pair of opposing rotating
铸辊12为内冷式(例如内部水冷)，使得随着铸辊12相对旋转时，熔池19中的熔融金属与铸造表面12A旋转地相接触、并在铸造表面12A上冷却凝固。在铸造过程中，在铸辊12的铸造表面12A上冷却凝固形成的金属壳在铸辊之间的辊隙18处被带到一起，以形成从辊隙向下传送的薄带钢产品。The
双辊连铸机特别适合用于制造高强度轻质钢带产品，并能实现连续、高效的生产。在本发明的技术方案中，特别地向熔融金属(钢水)中添加非金属元素，例如硒(Se)，能够改善在薄带连铸过程中熔融金属(钢水)在铸辊表面的浸润性。The twin-roll caster is particularly suitable for the manufacture of high-strength and light-weight steel strip products and enables continuous and efficient production. In the technical solution of the present invention, adding non-metallic elements such as selenium (Se) to molten metal (steel) can improve the wettability of molten metal (steel) on the surface of casting rolls during continuous strip casting.
优选地，硒(Se)的添加量选择为使得，在薄带连铸的过程中，钢水在铸辊表面的浸润角小于90°、优选小于80°。熔融金属在铸辊表面的良好的浸润性能够使得，熔融金属在旋转的铸辊表面贴合较好，并且冷却均匀，从而熔融金属在铸辊表面冷却凝固形成的钢带连续稳定且厚度均匀，不易发生断带，提高了生产连续性并降低了生产成本。Preferably, the amount of selenium (Se) added is selected such that, during continuous strip casting, the wetting angle of the molten steel on the surface of the casting roll is less than 90°, preferably less than 80°. The good wettability of the molten metal on the surface of the casting roll can make the molten metal fit well on the surface of the rotating casting roll and cool evenly, so that the steel strip formed by the cooling and solidification of the molten metal on the surface of the casting roll is continuous and stable and has a uniform thickness. It is not easy to break the belt, which improves the production continuity and reduces the production cost.
在钢水中添加Se元素可以有效减小钢水的表面张力，且Se含量越高，钢水表面张力越小，进而钢水在铸辊表面的浸润角越小，浸润性越好。在本发明的场景中，浸润性是指液体(钢水)对固体表面(铸辊表面)的浸润程度，其中在固、液、气三相交界处，自固-液界面经过液体内部到气-液界面之间的夹角称为接触角/浸润角；其中浸润角越小，浸润性越好。浸润性最根本的原因是液体表面张力的存在。通常，钢水在铸辊表面小于90°、优选小于80°的浸润角能够实现良好的浸润性和贴合性，以及从而连铸过程中铸造的连续稳定性、和均匀的钢带厚度。考虑到对钢水表面张力、以及浸润性的要求，以及对连铸过程中熔融金属纯净性的要求，Se元素的含量优选地选自约0.005％～约0.01％的范围内。Adding Se element in molten steel can effectively reduce the surface tension of molten steel, and the higher the content of Se, the smaller the surface tension of molten steel, and the smaller the wetting angle of molten steel on the surface of the casting roll, the better the wettability. In the context of the present invention, wettability refers to the degree of infiltration of liquid (molten steel) to the solid surface (casting roll surface). The angle between the liquid interfaces is called the contact angle/wetting angle; the smaller the wetting angle, the better the wettability. The most fundamental reason for wettability is the existence of liquid surface tension. Generally, a wetting angle of the molten steel on the roll surface of less than 90°, preferably less than 80°, enables good wettability and conformability, and thus continuous stability of casting during continuous casting, and uniform strip thickness. Taking into account the requirements for the surface tension and wettability of molten steel, and the requirements for the purity of molten metal during continuous casting, the content of Se element is preferably selected from the range of about 0.005% to about 0.01%.
在薄带连铸的过程中，熔融金属(钢水)经由中间包14、以及过渡包16而流入熔池19中，其中熔池19形成在相对旋转的一对铸辊12之间的辊隙18之上、及其铸造表面12A上方。提高钢水的温度有助于减小钢水的表面张力，并且钢水温度越高、钢水表面张力越小，钢水在铸辊表面的浸润角越小，浸润性越好。为了保持钢水在铸辊表面小于90°、优选小于80°的浸润角，熔池19中的钢水温度选择为不低于1550℃。同时考虑到，钢水温度过高会直接导致钢水在铸辊表面无法迅速冷却凝固成带，因此钢水温度优选选择为不超过1570℃。During strip casting, molten metal (steel) flows via a tundish 14 and a
熔融金属流入熔池19后，由于铸辊12被内部冷却(例如水冷)，使得随着铸辊12相对旋转时，熔池19中的熔融金属与旋转的铸辊表面12A持续接触、并在铸造表面12A上冷却凝固，进而在辊隙18处形成从辊隙向下传送的薄带钢产品。铸辊的旋转速度也会影响钢水在铸辊表面的稳定性，进而影响浸润性。一般地，铸辊的旋转运动越慢，钢水在其表面浸润性越好，形成的钢带的厚度稳定性也越好，因此铸辊的理想状态是静止。但考虑到薄带连铸的工艺要求，该对铸辊12必须不间断的相对旋转，以便将钢带带离熔池、并从辊隙向下传送，因此铸辊不能保持静止。综合考虑浸润性和铸造速度，在本发明的技术方案中，铸辊的旋转线速度≤0.8m/s。在本发明的场景中，铸辊的旋转线速度为铸辊表面的线速度，即铸辊角速度与铸辊半径的乘积。After the molten metal flows into the
下文的表1中列出了多个对比例和实施例，以说明在薄带连铸工艺中，钢水中Se含量、熔池钢水温度和铸辊旋转线速度对铸辊表面钢水浸润角(即铸辊表面钢水浸润性)的影响。在综合考虑以上因素的情况下，能够实现钢水在铸辊表面较优的浸润性(例如浸润角小于90°、优选小于80°)，并且实现较长时间的稳定生产，降低生产成本，提高生产效率，满足工业生产的实际需求。A number of comparative examples and examples are listed in Table 1 below to illustrate the effects of the Se content in the molten steel, the molten bath temperature and the rotational speed of the casting roll on the molten steel wetting angle on the surface of the casting roll (i.e., in the thin strip continuous casting process). The influence of molten steel wettability of casting roll surface). In the case of comprehensively considering the above factors, it is possible to achieve better wettability of molten steel on the surface of the casting roll (for example, the wetting angle is less than 90°, preferably less than 80°), and to achieve stable production for a long time, reduce production costs, and improve production. efficiency to meet the actual needs of industrial production.
表1对比例和实施例的工艺及钢水浸润性Table 1 Process and molten steel wettability of comparative examples and examples
具体来说，根据表1的实验结果可以看出，随着钢水中Se含量增加、熔池钢水温度升高以及铸辊旋转线速度的减小，钢水在铸辊表面上的浸润角呈现减小趋势。优选地，在钢水中添加不低于0.005％的Se含量(包括0.005％)，从而能保持钢水在铸辊表面良好的浸润性。进一步地，熔池中的钢水温度优选地不低于1550℃(包括1550℃)，并且铸辊的旋转线速度优选地不超过0.8m/s，从而能够实现钢水在铸辊表面的浸润角低于80°，进一步地实现了钢水在铸辊表面的良好浸润性和贴合性，以及从而连铸过程中铸造的连续稳定性。Specifically, according to the experimental results in Table 1, it can be seen that the wetting angle of molten steel on the surface of the casting roll decreases with the increase of the Se content in the molten steel, the increase of the molten steel temperature in the molten pool, and the decrease of the rotational speed of the casting roll. trend. Preferably, Se content of not less than 0.005% (including 0.005%) is added to the molten steel, so that the good wettability of the molten steel on the surface of the casting roll can be maintained. Further, the temperature of molten steel in the molten pool is preferably not lower than 1550°C (including 1550°C), and the rotational speed of the casting roll is preferably not more than 0.8 m/s, so that a low wetting angle of the molten steel on the surface of the casting roll can be achieved. At 80°, the good wettability and fit of molten steel on the surface of the casting roll, and thus the continuous stability of casting during the continuous casting process, is further achieved.
此外，在本发明的生产工艺中，除了硒(Se)元素外，熔融金属中还包括：不超过0.03％的碳(C)，不超过0.5％的硅(Si)，不超过0.2％的锰(Mn)，不超过0.005％的氮(N)，不超过0.005％的硫(S)。进而，本发明还提供了一种根据本发明的前述改善的生产方法形成的钢带产品，包括按重量计：不超过0.03％的碳(C)，不超过0.5％的硅(Si)，不超过0.2％的锰(Mn)，不超过0.005％的氮(N)，不超过0.005％的硫(S)，以及不低于0.005％的硒(Se)。优选地，硒(Se)的含量按照重量百分比计在0.005％～0.01％的范围内。如前文所述，在钢水中添加的Se有助于改善钢水在铸辊表面的浸润性，从而确保了生产钢带的较长的连续长度、以及厚度的均匀性。In addition, in the production process of the present invention, in addition to the selenium (Se) element, the molten metal also includes: no more than 0.03% carbon (C), no more than 0.5% silicon (Si), no more than 0.2% manganese (Mn), not more than 0.005% nitrogen (N), not more than 0.005% sulfur (S). Furthermore, the present invention also provides a steel strip product formed according to the aforementioned improved production method of the present invention, comprising by weight: not more than 0.03% carbon (C), not more than 0.5% silicon (Si), not more than 0.5% by weight More than 0.2% manganese (Mn), not more than 0.005% nitrogen (N), not more than 0.005% sulfur (S), and not less than 0.005% selenium (Se). Preferably, the content of selenium (Se) ranges from 0.005% to 0.01% by weight. As mentioned above, the addition of Se in the molten steel helps to improve the wettability of the molten steel on the surface of the casting rolls, thereby ensuring a long continuous length and uniform thickness of the produced steel strip.
以上所述仅是本发明的具体实施方式，应该指出，对于本技术领域的普通技术人员来说，不在脱离本发明原理的前提下，还可以做出若干改进和润饰，这些改进和润饰也应视为本发明保护的范围。The above are only specific embodiments of the present invention. It should be pointed out that for those skilled in the art, some improvements and modifications can be made without departing from the principles of the present invention, and these improvements and modifications should also be It is regarded as the scope of protection of the present invention.
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