CN104233044B - The production method of a kind of high aluminum steel - Google Patents
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Abstract
Description
技术领域technical field
本发明涉及炼钢技术领域，更具体地讲，涉及一种高铝钢的生产方法。The invention relates to the technical field of steelmaking, and more specifically, relates to a production method of high-alumina steel.
背景技术Background technique
相变诱导塑性钢(TRIP钢)是重要的汽车用先进高强钢，某钢厂冶炼该钢种时发现，由于该钢种中铝含量较高，在浇铸过程中容易影响保护渣润滑性能，从而导致铸坯质量问题和漏钢事故的产生，在现有技术中，尚未出现能够克服上述技术难题的高铝钢方法。Transformation-induced plasticity steel (TRIP steel) is an important advanced high-strength steel for automobiles. When a steel plant smelted this steel, it was found that due to the high aluminum content in this steel, the lubrication performance of mold slag was easily affected during the casting process, thus Leading to billet quality problems and steel breakout accidents, in the prior art, there has not been a high-aluminum steel method that can overcome the above-mentioned technical problems.
发明内容Contents of the invention
针对现有技术中存在的不足，本发明的目的之一在于解决上述现有技术中存在的一个或多个问题。例如，本发明的目的之一在于提供一种能够防止高铝钢在浇注过程中出现漏钢或者产生铸坯质量缺陷的高铝钢的生产方法。In view of the deficiencies in the prior art, one purpose of the present invention is to solve one or more problems in the above prior art. For example, one of the objectives of the present invention is to provide a production method of high aluminum steel that can prevent steel breakout or slab quality defects during the casting process of high aluminum steel.
为了实现上述目的，本发明提供了一种高铝钢的生产方法。所述生产方法包括冶炼钢水并进行连铸，其中，在连铸过程中大包至中间包采用长水口及吹氩保护浇铸，中间包的塞棒不吹氩气，并且，在开始浇注时，先浇注非高铝钢，待拉速稳定后再开始浇注高铝钢。In order to achieve the above object, the present invention provides a production method of high aluminum steel. The production method includes smelting molten steel and performing continuous casting, wherein, during the continuous casting process, the ladle to the tundish are protected by shroud and argon blowing, and the stopper of the tundish is not blown with argon, and, when starting to pour, Cast non-high-aluminum steel first, and then start pouring high-aluminum steel after the casting speed is stable.
根据本发明高铝钢的生产方法的一个实施例，控制长水口的吹氩流量在60L/min以上。According to an embodiment of the production method of the high aluminum steel of the present invention, the argon blowing flow rate of the shroud is controlled to be above 60 L/min.
根据本发明高铝钢的生产方法的一个实施例，按质量百分比计，所述高铝钢中铝含量为0.75～0.85％。According to an embodiment of the production method of the high-aluminum steel of the present invention, the aluminum content in the high-aluminum steel is 0.75-0.85% by mass percentage.
根据本发明高铝钢的生产方法的一个实施例，所述高铝钢的化学成分按质量百分比计包括：C：0.30～0.34％、Si：0.75～0.90％、Mn：1.85～2.00％、P≤0.020％、S≤0.005％、Als：0.75～0.85％、N≤0.0040％、V：0.07～0.11％、Ti：0.13～0.17％以及余量的Fe及不可避免的杂质。According to an embodiment of the production method of high aluminum steel in the present invention, the chemical composition of the high aluminum steel includes: C: 0.30-0.34%, Si: 0.75-0.90%, Mn: 1.85-2.00%, P ≤0.020%, S≤0.005%, Als: 0.75-0.85%, N≤0.0040%, V: 0.07-0.11%, Ti: 0.13-0.17%, and the balance Fe and unavoidable impurities.
根据本发明高铝钢的生产方法的一个实施例，所述非高铝钢的化学成分按质量百分比计包括：C：0.13～0.18％、Si：0.05～0.13％、Mn：0.20～0.30％、P≤0.025％、S≤0.020％以及余量的Fe及不可避免的杂质。According to an embodiment of the production method of high-alumina steel in the present invention, the chemical composition of the non-high-alumina steel includes: C: 0.13-0.18%, Si: 0.05-0.13%, Mn: 0.20-0.30%, P≤0.025%, S≤0.020%, and the balance of Fe and unavoidable impurities.
根据本发明高铝钢的生产方法的一个实施例，所述连铸过程中的拉速为0.9～1.0m/min。According to an embodiment of the production method of high aluminum steel of the present invention, the casting speed in the continuous casting process is 0.9-1.0 m/min.
根据本发明高铝钢的生产方法的一个实施例，所述生产方法在最后一炉浇注所述高铝钢。According to an embodiment of the production method of the high-aluminum steel of the present invention, the production method casts the high-aluminum steel in the last furnace.
与现有技术相比，本发明的有益效果包括采用本发明的方法有效地避免了高铝钢在浇注时出现钢水中铝出现二次氧化，防止钢水中产生大量的氧化铝夹杂，从而避免了其影响产品质量和保护渣润滑效果，避免了漏钢事故的发生。Compared with the prior art, the beneficial effects of the present invention include adopting the method of the present invention to effectively avoid secondary oxidation of aluminum in molten steel during pouring of high-alumina steel, prevent a large amount of aluminum oxide inclusions in molten steel, and thus avoid It affects product quality and mold slag lubrication effect, avoiding the occurrence of steel breakout accidents.
具体实施方式detailed description
在下文中，将结合示例性实施例详细地描述根据本发明的高铝钢的生产方法。Hereinafter, the production method of the high alumina steel according to the present invention will be described in detail with reference to exemplary embodiments.
经过对生产现场多炉高铝钢生产过程进行观测和分析发现，高铝钢容易出现漏钢事故的主要原因在于：由于高铝钢中含Al较高，如果在浇铸过程中被二次氧化，将会造成钢水中产生大量的氧化铝夹杂，影响板材质量和保护渣的润滑效果，甚至造成漏钢事故，所以在浇铸过程中，主要是如何防止钢水被二次氧化和影响保护渣润滑效果，基于此，本发明提出了一种高铝钢的生产方法。After observing and analyzing the production process of multi-furnace high-alumina steel at the production site, it was found that the main reason for high-alumina steel to be prone to steel breakout accidents is: due to the high Al content in high-alumina steel, if it is secondary oxidized during the casting process, It will cause a large amount of alumina inclusions in the molten steel, which will affect the quality of the plate and the lubricating effect of the mold slag, and even cause a steel breakout accident. Therefore, in the casting process, the main thing is how to prevent the molten steel from being oxidized again and affecting the lubricating effect of the mold slag. Based on this, the present invention proposes a production method of high aluminum steel.
根据本发明示例性实施例的高铝钢的生产方法主要包括以下操作：The production method of high aluminum steel according to an exemplary embodiment of the present invention mainly includes the following operations:
在连铸过程中大包至中间包采用长水口及吹氩保护浇铸，中间包的塞棒不吹氩气，并且，在开始浇注时，先浇注非高铝钢，待拉速稳定后再开始浇注高铝钢。其中，非高铝钢选用夹杂物少、钢水可浇性好且与冶炼高铝钢化学成分相近的钢种。In the continuous casting process, long nozzles and argon blowing are used to protect the casting from the ladle to the tundish. The stopper of the tundish is not blown with argon, and when starting to pour, first pour non-high aluminum steel, and then start after the casting speed is stable. Cast high aluminum steel. Among them, non-high-aluminum steels are selected from steels with less inclusions, good castability of molten steel and similar chemical composition to smelted high-aluminum steels.
例如，在一个示例性实施例中，冶炼的高铝钢的化学成分按质量百分比计包括：C：0.30～0.34％、Si：0.75～0.90％、Mn：1.85～2.00％、P≤0.020％、S≤0.005％、Als：0.75～0.85％、N≤0.0040％、V：0.07～0.11％、Ti：0.13～0.17％以及余量的Fe及不可避免的杂质，并且该钢种的屈服强度在980MPa以上。而所采用的述非高铝钢的化学成分按质量百分比计包括：C：0.13～0.18％、Si：0.05～0.13％、Mn：0.20～0.30％、P≤0.025％、S≤0.020％以及余量的Fe及不可避免的杂质。For example, in an exemplary embodiment, the chemical composition of the smelted high-alumina steel includes: C: 0.30-0.34%, Si: 0.75-0.90%, Mn: 1.85-2.00%, P≤0.020%, S≤0.005%, Als: 0.75～0.85%, N≤0.0040%, V: 0.07～0.11%, Ti: 0.13～0.17%, and the rest of Fe and unavoidable impurities, and the yield strength of this steel is 980MPa above. The chemical composition of the non-high-alumina steel used includes: C: 0.13-0.18%, Si: 0.05-0.13%, Mn: 0.20-0.30%, P≤0.025%, S≤0.020%, and the rest A large amount of Fe and unavoidable impurities.
优选地，控制长水口的吹氩流量在60L/min以上，以提高保护浇铸效果，防止钢水在由大包(钢包)注入中间包时发生钢水二次氧化，产生大量的Al2O3夹杂。Preferably, the argon blowing flow rate of the shroud is controlled above 60L/min to improve the protective casting effect and prevent secondary oxidation of the molten steel when the molten steel is poured into the tundish from the ladle (steel ladle), resulting in a large amount of Al 2 O 3 inclusions.
根据本发明，采用异钢种同包混浇，即在包次前面几炉先浇注其它钢种，然后再浇注高铝钢，可以使高铝钢在浇注时拉速保持稳定，同时中间包内已经有一定的钢水量，避免钢水被二次氧化。若在第一炉就浇注高铝钢，由于拉速需要由低到高缓慢增加，低拉速时间较长，例如，第一炉拉速从0.3m/min缓慢升至0.9m/min，需要10min左右，导致保护渣成分与钢中的铝充分反应并且反应产物进入保护渣，使得保护渣粘度升高以及流动性变差，影响保护渣的润滑效果，将造成漏钢事故或铸坯质量缺陷。According to the present invention, different steel types are mixed in the same ladle, that is, other steel types are poured in several heats before the ladle, and then the high-alumina steel is poured, so that the casting speed of the high-alumina steel can be kept stable during pouring, and at the same time There is already a certain amount of molten steel to avoid secondary oxidation of molten steel. If the high-alumina steel is poured in the first furnace, the casting speed needs to be increased slowly from low to high, and the low casting speed takes a long time. For example, the casting speed of the first furnace is slowly increased from 0.3m/min to 0.9m/min. After about 10 minutes, the components of the mold slag will fully react with the aluminum in the steel and the reaction products will enter the mold slag, which will increase the viscosity of the mold slag and deteriorate its fluidity, which will affect the lubrication effect of the mold slag and cause steel breakout accidents or slab quality defects .
而关闭塞棒吹氩是因为：塞棒吹氩时将会增加保护渣和钢水反应动力学条件，钢水中的铝进入到保护渣中，形成高熔点化合物(例如，Al2O3)，使保护渣的碱度、粘度升高，严重影响保护渣润滑效果。The reason for closing the stopper rod to blow argon is that: when the stopper rod blows argon, the kinetic conditions of the reaction between the mold slag and the molten steel will be increased, and the aluminum in the molten steel will enter into the mold slag to form a high melting point compound (for example, Al 2 O 3 ), making The alkalinity and viscosity of the mold flux increase, which seriously affects the lubrication effect of the mold flux.
为了更好地理解本发明的上述示例性实施例，下面结合具体示例对其进行进一步说明。In order to better understand the above exemplary embodiments of the present invention, it will be further described below in conjunction with specific examples.
示例：Example:
在连铸过程中大包至中间包采用长水口及吹氩保护浇铸，控制长水口的吹氩流量为65L/min；中间包的塞棒不吹氩气；在开始浇注时，先浇注的钢种成分按质量百分比计包括：C：0.16％、Si：0.12％、Mn：0.24％、P：0.012％、S：0.016％以及余量的Fe及不可避免的杂质；在最后一炉开始浇注本示例的高铝钢，所得高铝钢的化学成分按质量百分比计包括：C：0.34％、Si：0.89％、Mn：1.90％、Als：0.82％、V：0.08％、Ti：0.17％、P：0.015％、S：0.002％以及余量的Fe及不可避免的杂质。In the continuous casting process, long nozzles and argon blowing are used to protect the casting from the ladle to the tundish, and the argon blowing flow rate of the long nozzle is controlled to be 65L/min; the stopper rod of the tundish is not blown with argon; The components include: C: 0.16%, Si: 0.12%, Mn: 0.24%, P: 0.012%, S: 0.016%, and the rest of Fe and unavoidable impurities in the last heat. Example of high aluminum steel, the chemical composition of the obtained high aluminum steel includes: C: 0.34%, Si: 0.89%, Mn: 1.90%, Als: 0.82%, V: 0.08%, Ti: 0.17%, P : 0.015%, S: 0.002%, and the balance Fe and unavoidable impurities.
根据本示例，只浇铸了一炉钢，就成功浇注得到了高铝钢，且没有造成漏钢事故，而其它钢厂需浇铸2～3次以上，才能成功浇铸，很难避免浇铸过程中的漏钢事故。According to this example, only one batch of steel was cast, and the high-aluminum steel was successfully cast without causing a steel breakout accident. However, other steel plants need to cast more than 2 to 3 times before they can be successfully cast, and it is difficult to avoid defects in the casting process. Leakage accident.
综上所述，本发明提供了一种高铝钢的生产方法，通过长水口吹氩并控制吹氩流量、异钢种同包混浇并先浇注其它钢种后浇注高铝钢以及关闭塞棒吹氩等技术措施共同实现了防止浇注过程中钢水中的铝被二次氧化，避免了钢水中产生大量的氧化铝夹杂，避免其影响板材质量和保护渣的润滑效果，从而，防止了漏钢事故的发生或铸坯质量缺陷地出现，所生产得到的高铝钢质量好，能够适用于生产高质量汽车面板。To sum up, the present invention provides a production method of high aluminum steel, blowing argon through the long nozzle and controlling the flow rate of blowing argon, mixing different steel types in the same package, pouring other steel types first and then pouring high aluminum steel, and closing the plug Rod blowing argon and other technical measures have jointly realized the prevention of secondary oxidation of aluminum in the molten steel during the pouring process, avoided a large amount of aluminum oxide inclusions in the molten steel, and prevented it from affecting the quality of the plate and the lubricating effect of the mold slag, thereby preventing leakage In the event of a steel accident or a defect in the quality of the slab, the high-aluminum steel produced is of good quality and can be used for the production of high-quality automotive panels.
尽管上面已经通过结合示例性实施例描述了本发明，但是本领域技术人员应该清楚，在不脱离权利要求所限定的精神和范围的情况下，可对本发明的示例性实施例进行各种修改和改变。Although the present invention has been described above in conjunction with the exemplary embodiments, it should be apparent to those skilled in the art that various modifications and changes may be made to the exemplary embodiments of the present invention without departing from the spirit and scope defined in the claims. Change.
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| CN109175287B (en) * | 2018-11-05 | 2020-06-19 | 首钢集团有限公司 | Continuous casting method for high-aluminum steel plate blank |
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