CN106319155A - Method and device for adding high vapor pressure magnesium into molten steel - Google Patents

Method and device for adding high vapor pressure magnesium into molten steel Download PDF

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CN106319155A
CN106319155A CN201510381344.6A CN201510381344A CN106319155A CN 106319155 A CN106319155 A CN 106319155A CN 201510381344 A CN201510381344 A CN 201510381344A CN 106319155 A CN106319155 A CN 106319155A
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magnesium
molten steel
steel
conveying pipe
pipe
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CN106319155B (en
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黄文星
张健
张承乾
曾馨莹
苏彦豪
陆木荣
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National Cheng Kung University NCKU
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Abstract

The invention provides a method and a device for adding high vapor pressure metal magnesium into molten steel, wherein the magnesium adding device mainly comprises a storage tank, a control valve and a body, the body conveying pipe, an embedded pipe and a three-way pipe comprise the steps of putting the magnesium adding device into a pipe furnace, filling pure magnesium particles with the particle size of 0.5-2mm into the storage tank, opening the control valve after the temperature of the middle lower part of a conveying pipe group is raised to 1120-1200 ℃, adding the pure magnesium particles into the conveying pipe group at the speed of 0.5-1.5g/min, simultaneously opening an argon regulating valve, introducing argon at the flow rate of 0.5-1.5L/min, and loading magnesium vapor in the conveying pipe into the molten steel. Therefore, the invention has the advantages of stable and safe magnesium addition into the molten steel, high magnesium yield, no introduction of alloy elements, low production cost, uniform magnesium distribution in the molten steel and the like.

Description

钢液添加高蒸气压镁的方法及其装置Method and device for adding high vapor pressure magnesium to molten steel

技术领域technical field

本发明涉及一种钢液添加高蒸气压镁的方法及其装置,将该装置放入管式炉内,当温度达到设定温度时,令镁金属形成镁蒸气后,再载入钢液中。The invention relates to a method and a device for adding high vapor pressure magnesium to molten steel. The device is put into a tube furnace, and when the temperature reaches a set temperature, magnesium metal is made to form magnesium vapor, and then loaded into molten steel .

背景技术Background technique

炼钢是一个氧化精炼过程,即向铁液中吹入氧气,将生铁中过量的元素(C、Si、Mn)及杂质(S、P)去除,达到满足钢种性能的限度。由于吹氧炼钢的作用,在炼钢末期,钢液中含氧量最大可达到0.1%,然而氧在固态钢中的溶解度极低(例如在δ-Fe中溶解度最大为0.0082%),这些过量的氧将在凝固的过程中以FeO或其它氧化物的形态析出,因而降低钢的使用性能。所以,在脱碳结束之后必须将钢液中的氧脱除。钢中的氧包括溶解的自由氧[O]D和夹杂物中的氧[O]L,去氧即通过向钢液中添加脱氧剂(如锰,硅,钛,铝,镁等),将钢中的自由氧转移到氧化物介在物(inclusion)中,上浮去除,达到降低钢中的氧含量的目的。而钢中氧含量的水准可间接反映钢中介在物数量水准,常用钢中的总氧T[O]表示钢液的洁净度。Steelmaking is an oxidation refining process, that is, oxygen is blown into molten iron to remove excess elements (C, Si, Mn) and impurities (S, P) in pig iron to meet the limit of steel performance. Due to the effect of oxygen blowing steelmaking, at the end of steelmaking, the maximum oxygen content in molten steel can reach 0.1%, but the solubility of oxygen in solid steel is extremely low (for example, the maximum solubility in δ-Fe is 0.0082%), these Excessive oxygen will be precipitated in the form of FeO or other oxides during the solidification process, thus reducing the performance of the steel. Therefore, the oxygen in the molten steel must be removed after the decarburization is completed. Oxygen in steel includes dissolved free oxygen [O] D and oxygen [O] L in inclusions. Deoxidation means adding deoxidizers (such as manganese, silicon, titanium, aluminum, magnesium, etc.) The free oxygen in the steel is transferred to the oxide inclusion (inclusion), floated up and removed to achieve the purpose of reducing the oxygen content in the steel. The level of oxygen content in steel can indirectly reflect the level of the amount of intermediary in steel, and the total oxygen T[O] in steel is commonly used to indicate the cleanliness of molten steel.

钢中的总氧量T[O]与产品的品质有着密切的关系,典型钢种对氧含量的要求如图1所示,因此,如何降低钢中的氧含量,提高钢的洁净度,如何有效利用脱氧产物也越来越为冶金工作者所关注。The total oxygen content T[O] in the steel is closely related to the quality of the product. The requirements for the oxygen content of typical steel types are shown in Figure 1. Therefore, how to reduce the oxygen content in the steel and improve the cleanliness of the steel? The effective use of deoxidized products is also more and more concerned by metallurgists.

按照脱氧能力的不同,将脱氧合金分为弱脱氧剂(如Mn,Si,Ti等脱氧剂)和强脱氧剂(如Al,Mg等)。在早期钢铁生产中常使用硅、锰作为脱氧剂,由于与Si、Mn平衡的氧含量较高,为将钢中的氧含量脱除到极低水准,大部分钢铁企业均采用Al作为终脱氧剂。有研究显示,当钢中溶解铝含量为0.03%-0.05%时,钢中平均氧含量可降低到3ppm以下。然而,铝脱氧后残余在钢中的簇状(cluster)Al2O3夹杂会大大降低钢的塑性、韧性、疲劳强度、抗腐蚀能力,特别是破坏了钢基体的连续性,在静荷载和动荷载的作用下造成材料失效,降低钢材成品率和产品品质。另一方面,钢液浇注过程中Al2O3夹杂极易造成水口堵塞而造成浇注中断等生产事故。According to the different deoxidizing ability, deoxidizing alloys are divided into weak deoxidizing agents (such as Mn, Si, Ti and other deoxidizing agents) and strong deoxidizing agents (such as Al, Mg, etc.). In the early iron and steel production, silicon and manganese were often used as deoxidizers. Due to the high oxygen content in balance with Si and Mn, in order to remove the oxygen content in steel to an extremely low level, most iron and steel enterprises use Al as the final deoxidizer. . Studies have shown that when the dissolved aluminum content in steel is 0.03%-0.05%, the average oxygen content in steel can be reduced to below 3ppm. However, the cluster Al 2 O 3 inclusions remaining in the steel after aluminum deoxidation will greatly reduce the plasticity, toughness, fatigue strength, and corrosion resistance of the steel, especially destroying the continuity of the steel matrix. Under the action of dynamic load, the material will fail, and the steel yield and product quality will be reduced. On the other hand, Al 2 O 3 inclusions in the molten steel pouring process can easily cause nozzle blockage and cause production accidents such as pouring interruption.

而镁元素具有很强的化学活性,在钢液中Mg对非金属元素有很强的亲和力。早在1970’s,Mori等就曾指出镁蒸气对钢液去氧的可能性,其利用镁作为脱氧剂,获得在1873K时的[%Mg][%O]<1.0×10-6。Saxena等研究了用镁作炼钢精炼剂的可能性,研究发现,钢中形成极小的、弥散分布(uniform distribution)的尖晶石(spinel)型氧化物,这种尖晶石对钢的疲劳性能和其它性能无损害。Magnesium has a strong chemical activity, and Mg has a strong affinity for non-metallic elements in molten steel. As early as 1970's, Mori et al. pointed out the possibility of deoxidizing molten steel by magnesium vapor. They used magnesium as a deoxidizer to obtain [%Mg][%O]<1.0×10 -6 at 1873K. Saxena and others studied the possibility of using magnesium as a refining agent for steelmaking, and found that a very small, uniform distribution of spinel (spinel) oxides is formed in the steel, and this spinel has a strong effect on the steel. Fatigue performance and other properties are not impaired.

(Tateyama等采用镁包芯线(cored wire)(Mg、MgO、CaF2)在低碳钢氩气保护的感应炉内进行镁去氧、脱硫实验。)镁的加入量小于15%,5分钟后可以将钢液中的T[O]降低至9ppm,[S]降低至3ppm;静止放置10分钟后钢液中的T[O]、[S]没有发现回升,分别保持在11ppm和3ppm的水准。因此,可以看出Mg与钢液中的S和O有强烈的亲和力,且不改变钢液成分,是理想的去氧和脱硫剂。此外,近年来氧化物冶金技术的发展,利用Mg处理钢液而获得高熔点、细小、弥散的含镁介在物细化晶粒,使得在钢液中添加Mg的相关问题成为热点问题。(Tateyama et al. used magnesium-clad wire (cored wire) (Mg, MgO, CaF 2 ) to conduct magnesium deoxidation and desulfurization experiments in an induction furnace protected by argon gas on low-carbon steel.) The addition of magnesium is less than 15%, 5 minutes After that, the T[O] and [S] in the molten steel can be reduced to 9ppm, and [S] can be reduced to 3ppm; T[O] and [S] in the molten steel after standing still for 10 minutes have not been found to rise, and they are kept at 11ppm and 3ppm respectively. level. Therefore, it can be seen that Mg has a strong affinity with S and O in molten steel, and does not change the composition of molten steel, so it is an ideal deoxidizing and desulfurizing agent. In addition, with the development of oxide metallurgy technology in recent years, Mg is used to treat molten steel to obtain high melting point, fine and dispersed magnesium-containing intervening fine grains, making the related issues of adding Mg to molten steel a hot issue.

事实上,在钢铁生产过程中,已经采用气体喷吹法将钝化镁(passivationmagnesium)颗粒喷入铁水(hot metal)内,达到铁水脱硫的目的。也采用类似的方法将镁通入铁液中生产球墨铸铁(nodular cast iron)。请参阅图2所示,Mg与Al的蒸气压与温度的关系,从图2中可以看出在炼钢温度下(1600℃)Mg具有非常高的蒸气压(其蒸气压是铝的200倍),很显然,由于在钢液温度(1600℃)远高于铁水温度(1300-1400℃),这种喷吹钝化镁粒的方法无法直接应用于钢液的镁处理制程。因此在这里也很大程度上限制了镁在实际炼钢生产中的使用。因此如何以安全有效的方式将镁加入钢液,成为钢液镁处理冶金技术的核心问题之一。In fact, in the process of iron and steel production, the gas injection method has been used to spray passivation magnesium (passivationmagnesium) particles into molten iron (hot metal) to achieve the purpose of desulfurization of molten iron. A similar method is also used to pass magnesium into molten iron to produce nodular cast iron. Please refer to Figure 2, the relationship between the vapor pressure and temperature of Mg and Al. From Figure 2, it can be seen that Mg has a very high vapor pressure (200 times that of aluminum) at the steelmaking temperature (1600°C) ), obviously, since the molten steel temperature (1600°C) is much higher than the molten iron temperature (1300-1400°C), this method of spraying passivated magnesium particles cannot be directly applied to the magnesium treatment process of molten steel. Therefore, the use of magnesium in actual steelmaking production is also largely limited here. Therefore, how to add magnesium to molten steel in a safe and effective manner has become one of the core issues in the metallurgical technology of molten steel magnesium treatment.

目前通常采用的将镁加入钢水的方法有冲入法、喂线法(cored wire method)、压入法(plunging method)等,加入的合金种类有稀土镁合金、高镁合金、钝化镁粒等。中国公开的专利介绍了一种在锭模(ingot mold)底部均匀铺垫NiMg合金添加镁的方法。所添加的NiMg合金中Mg含量范围为5-50%。很显然,该种方法向钢液中引入了金属Ni,既破坏了原始钢液的化学成分,也增加了生产的成本。同时,在应用该种方法时,需将钢中的氧位调整到一个较高的水准,也使的钢液的全氧含量上升。At present, the commonly used methods of adding magnesium to molten steel include flushing method, cored wire method, plunge method, etc. The types of alloys added include rare earth magnesium alloys, high magnesium alloys, and passivated magnesium particles. Wait. The Chinese published patent introduces a method of uniformly paving NiMg alloy on the bottom of an ingot mold and adding magnesium. The range of Mg content in the added NiMg alloy is 5-50%. Obviously, this method introduces metal Ni into the molten steel, which not only destroys the chemical composition of the original molten steel, but also increases the production cost. At the same time, when applying this method, the oxygen level in the steel needs to be adjusted to a higher level, which also increases the total oxygen content of the molten steel.

另有一种特殊结构的镁包芯线,将该镁芯线通过喂线设备(cored wire injectionsystem)喂入钢液深处。很显然,镁芯线在到达钢液底部时,镁将发生Mg(s)→Mg(l)→Mg(g)的演变过程,由于钢液与镁芯线之间巨大的温度变化,使得Mg(s)→Mg(g)的过程在非常短暂的时间内即完成,由于镁在气化过程中,将产生非常大的压力,极易造成钢液剧烈翻腾而产生生产事故。还有一种利用铝热还原法(Aluminothermic reduction)制备的Mg蒸气,并利用氩气作为载体将镁蒸气导入钢液。There is also a magnesium cored wire with a special structure, which is fed into the depth of the molten steel through a cored wire injection system. Obviously, when the magnesium core wire reaches the bottom of the molten steel, the magnesium will undergo the evolution process of Mg(s)→Mg(l)→Mg(g). Due to the huge temperature change between the molten steel and the magnesium core wire, the Mg The process of (s)→Mg(g) is completed in a very short period of time. Since magnesium will generate a very large pressure during the gasification process, it is very easy to cause violent tumbling of molten steel and produce production accidents. There is also a kind of Mg vapor prepared by Aluminothermic reduction, and argon is used as a carrier to introduce magnesium vapor into molten steel.

虽然传统已有多种将镁加入钢液中的方式,但显然都仍有瑕疵,而非理想的方式,发明人针对此缺失,特别加以研究改良,并凭借本身的专业及多年来实验经验,终于在历经多次的试验、修正与改进后,而有本发明的诞生。Although there are many traditional methods of adding magnesium to molten steel, they are obviously flawed and not ideal. The inventor has specially researched and improved this deficiency, and relying on his own expertise and years of experimental experience, Finally, after repeated tests, corrections and improvements, the present invention is born.

发明内容Contents of the invention

本发明有关于一种于钢液添加高蒸气压镁的方法及其装置,该装置即是镁的添加装置,包含有密闭的储料桶,控制阀及输送管组。藉由将镁添加装置放入管式炉内,再将粒径为0.5~2mm的纯镁粒装入储料桶内。因为当纯镁粒粒径小于0.5mm时,会使得镁粒穿过输送管组内的内嵌管而与钢液接触,而当粒径大于2mm时,则会使得镁粒无法穿过控制阀门进入输送管。待输送管中下部温度升至1120℃-1200℃时,将控制阀打开,以适当的加料速度将纯镁粒加入输送管,并在此时打开氩气调节阀。因为当氩气流量低于0.2L/min,会使得在钢液底部形成的含镁氩气泡过大,不利于氩气泡中的镁质传到钢液,而当氩气流量大于0.5L/min,或使得钢液表面的镁的蒸气压过低,造成镁收得率降低。所以以0.2-0.5L/min的流量通入氩气,即能快速又安全的将输送管中的镁蒸气载入钢液内。The invention relates to a method and a device for adding high vapor pressure magnesium to molten steel. The device is a magnesium adding device, which includes a closed material storage tank, a control valve and a delivery pipe group. Put the magnesium adding device into the tube furnace, and then put the pure magnesium particles with a particle size of 0.5-2mm into the storage barrel. Because when the particle size of pure magnesium is less than 0.5mm, the magnesium particles will pass through the embedded pipe in the delivery pipe group and contact the molten steel, and when the particle size is larger than 2mm, the magnesium particles will not be able to pass through the control valve. into the delivery tube. When the temperature in the lower part of the conveying pipe rises to 1120°C-1200°C, open the control valve, feed pure magnesium particles into the conveying pipe at an appropriate feeding speed, and open the argon regulating valve at this time. Because when the argon gas flow is lower than 0.2L/min, the magnesium-containing argon bubbles formed at the bottom of the molten steel will be too large, which is not conducive to the transfer of magnesium in the argon bubbles to the molten steel, and when the argon gas flow is greater than 0.5L/min , or the vapor pressure of magnesium on the surface of molten steel is too low, resulting in a decrease in the yield of magnesium. Therefore, the flow of argon gas at 0.2-0.5L/min can quickly and safely load the magnesium vapor in the delivery pipe into the molten steel.

而金属镁与钢中的氧、硫具有极强的亲和力,及具有非常高的的脱氧及脱硫效果,且其生成的MgO、MgS介在物具有细小,粒径分布均匀等特点。利用镁作为炼钢过程的初脱氧元素,或作为二次脱氧脱硫元素,不仅可以实现钢中的总氧、硫含量达到极低的水准,也可作为以铝、钛等作为初脱氧后的改质剂(inclusion modifier),将钢中大型的氧化铝及钛的氧化物介在物改质为细小的镁铝、镁钛复合介在物。为氧化物冶金技术的应用奠定基础。Magnesium metal has a strong affinity with oxygen and sulfur in steel, and has a very high deoxidation and desulfurization effect, and the MgO and MgS intermediaries produced by it have the characteristics of small size and uniform particle size distribution. Using magnesium as the primary deoxidation element in the steelmaking process, or as a secondary deoxidation and desulfurization element, not only can achieve extremely low levels of total oxygen and sulfur content in steel, but also can be used as an improvement after primary deoxidation with aluminum, titanium, etc. Inclusion modifier, which modifies the large aluminum oxide and titanium oxide inclusions in the steel into fine magnesium-aluminum, magnesium-titanium composite inclusions. Lay the foundation for the application of oxide metallurgy technology.

然而金属镁的熔点及沸点分别为670℃和1100℃,在炼钢温度(1600℃)条件下,其蒸气压将达到20-25个大气压,如将固态金属镁直接加入钢液,一方面将不可避免的造成钢液剧烈翻腾,甚至爆炸事故,另一方面也使得镁的收得率严重下降。所以运用本发明之装置及方法,可以安全及高效的方式将镁加入钢液中,成为钢液镁处理的关键所在。However, the melting point and boiling point of metallic magnesium are 670°C and 1100°C respectively. Under the condition of steelmaking temperature (1600°C), its vapor pressure will reach 20-25 atmospheres. If solid metallic magnesium is directly added to molten steel, on the one hand it will Inevitably, violent tumbling of molten steel and even explosion accidents are caused, and on the other hand, the yield of magnesium is seriously reduced. Therefore, using the device and method of the present invention, magnesium can be added to the molten steel in a safe and efficient manner, which becomes the key to the magnesium treatment of molten steel.

附图说明Description of drawings

图1为现有典型钢种对氧含量的要求图;Figure 1 is a diagram of the requirements of the existing typical steel grades on the oxygen content;

图2为现有Mg与Al的蒸气压与温度的关系图;Fig. 2 is the relationship figure of vapor pressure and temperature of existing Mg and Al;

图3为本发明镁添加装置的剖面示意图;Fig. 3 is the schematic sectional view of magnesium adding device of the present invention;

图4为本发明镁添加装置放入管式炉的示意图。Fig. 4 is a schematic diagram of putting the magnesium addition device of the present invention into a tube furnace.

附图标记说明:1镁添加装置;11储料桶;12控制阀;13本体;131输送管;132内嵌管;1321气孔;133三通管;14温度感应器;15耐渣侵蚀涂层;16坩锅;2管式炉;20炉膛;21管路;211阀门;212阀门;213阀门;22气体净化器;23流量计;230流量计;24输气导管;3钢液;4温度感测器。Explanation of reference signs: 1 magnesium adding device; 11 storage tank; 12 control valve; 13 body; 131 conveying pipe; 132 embedded pipe; 1321 air hole; ; 16 crucible; 2 tube furnace; 20 furnace; 21 pipeline; 211 valve; 212 valve; 213 valve; 22 gas purifier; 23 flow meter; 230 flow meter; sensor.

具体实施方式detailed description

以下是实施例,但本发明的内容并不局限于这些实施例的范围。The following are examples, but the contents of the present invention are not limited to the scope of these examples.

首先,请参阅图3所示,为本发明镁添加装置的剖面示意图,该镁添加装置1主要是由储料桶11、控制阀12及本体13所组成。该本体13具有一输送管131,中空内部设有内嵌管132,该本体13为一输送管131,侧壁设有一三通管133,可供氩气注入,而输送管131内设有一内嵌管132,位于内嵌管132底部为封闭并开设有数气孔1321,而在内嵌管132底部设置有一温度感应器14,位于本体13内壁则形成有一耐渣侵蚀涂层(corrosion resistant coating)15,上述各元件均是紧密连接,防止空气进入。First, please refer to FIG. 3 , which is a schematic cross-sectional view of the magnesium addition device of the present invention. The magnesium addition device 1 is mainly composed of a storage tank 11 , a control valve 12 and a body 13 . The main body 13 has a conveying pipe 131, and an embedded pipe 132 is arranged in the hollow interior. The embedded tube 132 is closed at the bottom of the embedded tube 132 and has several air holes 1321, and a temperature sensor 14 is arranged at the bottom of the embedded tube 132, and a corrosion resistant coating is formed on the inner wall of the body 13 15. The above components are tightly connected to prevent air from entering.

其次,将本发明的镁添加装置1安装于管式炉2的炉膛20内,配合参阅图4所示,将镁添加装置1放入管式炉2内,该管式炉2内的镁添加装置1的上下端分别藉由管路21延伸连通,且分别于不同位置设有阀门211、212及213,位于阀门211及213之间设有一气体净化器22,并设有流量计23及230,最上端则由一输气导管24连接至阀门213,位于镁添加装置1内壁置入有坩锅供置入钢液3,至于在管式炉2外壁则设有一温度感测器4。Next, the magnesium addition device 1 of the present invention is installed in the hearth 20 of the tube furnace 2, with reference to Fig. 4, the magnesium addition device 1 is put into the tube furnace 2, the magnesium addition in the tube furnace 2 The upper and lower ends of the device 1 are respectively extended and communicated by pipelines 21, and valves 211, 212 and 213 are respectively provided at different positions, and a gas purifier 22 is provided between the valves 211 and 213, and flow meters 23 and 230 are provided. , the uppermost end is connected to the valve 213 by a gas delivery conduit 24, a crucible is placed on the inner wall of the magnesium addition device 1 for placing molten steel 3, and a temperature sensor 4 is provided on the outer wall of the tube furnace 2.

而在炼钢温度1600℃的条件下,如何能安全地且能高收得率的将镁加入钢液,正是本发明的重要核心。请仍然参阅图3及4所示,当本发明实际使用时,先将阀门211、212及213打开,然后调节阀门212使流量计230流量范围为1-2L/min的流量,并通入氩气10分钟,使得管式炉2内的氧分压降至最低。接着将粒径为0.5~2min的纯镁粒装入储料桶11内,并调节阀门213使流量计23流量范围为0.5~1L/min的流量通入氩气5分钟后,关闭阀门213。然后通电将管式炉2坩锅16内的钢升温至1600℃后,持温使坩锅16内的钢完全溶化,更使得钢液3的温度均匀化。Under the condition of steelmaking temperature of 1600°C, how to add magnesium into molten steel safely and with high yield is the important core of the present invention. Please still refer to shown in Fig. 3 and 4, when the present invention is actually used, first valve 211, 212 and 213 are opened, then valve 212 is adjusted to make flowmeter 230 flow range be the flow rate of 1-2L/min, and feed argon Gas for 10 minutes, so that the oxygen partial pressure in the tube furnace 2 is reduced to the minimum. Next, put pure magnesium particles with a particle size of 0.5-2min into the storage tank 11, and adjust the valve 213 so that the flow rate of the flow meter 23 in the range of 0.5-1L/min is fed into the argon gas for 5 minutes, and then close the valve 213. Then energize the steel in the crucible 16 of the tubular furnace 2 to heat up to 1600° C., and then keep the temperature to completely melt the steel in the crucible 16 , so that the temperature of the molten steel 3 is evened.

此时,将镁添加装置1置管式炉2坩锅16上方,待温度感应器14侦测到温度范围为1120℃-1200℃的范围内时,且恒定在该范围内。此时打开控制阀12,以一定的加镁粒速度,将储料桶11中的纯镁粒加入到内嵌管132内,而能藉由温度将纯镁粒气化形成镁蒸气。此时打开阀门213,以0.2~0.5L/min流量,通入氩气,完成在钢液中添加镁的过程。At this time, the magnesium adding device 1 is placed above the crucible 16 of the tube furnace 2, and when the temperature sensor 14 detects that the temperature ranges from 1120° C. to 1200° C., it remains within this range. At this time, the control valve 12 is opened, and the pure magnesium particles in the storage tank 11 are added into the inline pipe 132 at a certain speed of adding magnesium particles, and the pure magnesium particles can be vaporized by the temperature to form magnesium vapor. At this time, the valve 213 is opened, and argon gas is introduced at a flow rate of 0.2-0.5 L/min to complete the process of adding magnesium to the molten steel.

因此,使用本发明在钢液3中添加高蒸气压镁的技术,显然具有如下的优点:Therefore, use the technology that the present invention adds high vapor pressure magnesium in molten steel 3, have following advantage obviously:

(1)本发明主要是向钢液3中添加纯镁,所以不会引入其它元素将钢液3成分复杂化。(1) The present invention mainly adds pure magnesium to molten steel 3, so other elements will not be introduced to complicate the composition of molten steel 3.

(2)本发明的特征是将镁金属蒸气化之后再利用氩气为载体将其添加进钢液3中,避免因固态镁颗粒与液体钢液直接接触而发生爆炸的危险。(2) The feature of the present invention is to use argon gas as a carrier to add magnesium metal into molten steel 3 after it is vaporized, so as to avoid the danger of explosion due to direct contact between solid magnesium particles and liquid molten steel.

(3)本发明是在实施过程中,全程采用氩气作为保护气体,避免镁与空气接触而氧化。(3) The present invention adopts argon gas as protective gas throughout the course of implementation to avoid oxidation of magnesium in contact with air.

(4)本发明的重点是利用管式炉2的炉膛20内1120℃-1200℃的温度范围达到镁的气化过程,不需要额外加装升温气化镁的加热装置。(4) The focus of the present invention is to utilize the temperature range of 1120° C.-1200° C. in the furnace 20 of the tube furnace 2 to achieve the gasification process of magnesium, and no additional heating device for heating and gasifying magnesium is required.

(5)本发明是在1120℃-1200℃的温度范围内将固态镁气化,在该温度范围内其镁的蒸气压仅为4个大气压。(5) The present invention vaporizes solid magnesium in the temperature range of 1120°C-1200°C, and the vapor pressure of magnesium in this temperature range is only 4 atmospheres.

(6)本发明在内嵌管132的部分,该内嵌管132为耐高温不锈钢材质;因此在镁气化过程中不会造成输送管131爆裂。(6) The embedded pipe 132 of the present invention is made of high-temperature-resistant stainless steel; therefore, the conveying pipe 131 will not burst during the magnesium gasification process.

(7)本发明在向钢液3添加镁时,是以氩气作为载体,可很好并均匀钢液3的成分,避免在管式炉2添加的过程中镁成分在钢液3总分布不均匀的状况。(7) The present invention uses argon gas as a carrier when adding magnesium to the molten steel 3, which can well and evenly form the composition of the molten steel 3, avoiding the total distribution of magnesium components in the molten steel 3 during the addition of the tube furnace 2 uneven condition.

(8)本发明在向钢液3添加镁时,镁的回收率较高。(8) In the present invention, when magnesium is added to molten steel 3, the recovery rate of magnesium is relatively high.

(9)本发明可通过控制储料桶11加入内嵌管14的镁的量,及配合加镁时间达到准确控制钢中镁含量。(9) The present invention can accurately control the magnesium content in the steel by controlling the amount of magnesium added to the embedded pipe 14 by the storage tank 11 and cooperating with the magnesium adding time.

综上所述,本发明能够安全地、稳定地将镁加入钢液中,且不引入其他的合金元素,不仅生产成本低且镁的收得率高,尤其钢液中的镁的分布非常均匀,又申请前并未发现有相同或类似的装置或方法申请专利在先或公开的资料,理已符合发明专利的要件,爰依法提出专利申请。In summary, the present invention can safely and stably add magnesium into molten steel without introducing other alloy elements, not only has low production cost but also has a high yield of magnesium, especially the distribution of magnesium in molten steel is very uniform , and the same or similar device or method has not been found to be patented or disclosed before the application, and it is reasonable to meet the requirements of the invention patent, and the patent application is filed according to law.

以上所述的实施例仅仅是对本发明的优选实施方式进行描述,并非对本发明的范围进行限定,在不脱离本发明设计精神的前提下,本领域普通技术人员对本发明的技术方案作出的各种变形和改进,均应落入本发明权利要求书确定的保护范围内。The above-mentioned embodiments are only descriptions of preferred implementations of the present invention, and are not intended to limit the scope of the present invention. Variations and improvements should fall within the scope of protection defined by the claims of the present invention.

Claims (6)

1. the method that a molten steel adds high vapour pressure magnesium, it is characterised in that mainly set a magnesium adding set and put into pipe In formula stove, when magnesium add device middle and lower part temperature rise to design temperature time, add pure magnesium grain, make pure magnesium particle shape become magnesium vapor, By argon, magnesium vapor is loaded in molten steel.
2. the method that molten steel as claimed in claim 1 adds high vapour pressure magnesium, it is characterised in that argon regulation valve with The flow of 0.5~1.5L/min is passed through argon.
3. the method that molten steel as claimed in claim 1 adds high vapour pressure magnesium, wherein, this magnesium vapor utilize argon with The flow of 0.2~0.5L/min is added in molten steel.
4. the method that molten steel as claimed in claim 1 adds high vapour pressure magnesium, wherein, the particle diameter of this pure magnesium grain is 0.5~2mm.
5. the device of the molten steel high vapour pressure magnesium of interpolation, it is characterised in that it is mainly by magnesium adding set and tube furnace institute Composition, this magnesium adding set includes:
One storage vat, for hermetic container, is located at topmost;
One body, for hollow tubular, combines closely with this storage vat, forms a conveying pipe;One control valve, is located at Between this storage vat and this conveying pipe, the blanking of storage vat can be adjusted;One embedded pipe, is located in this conveying pipe, and it is close Closing shape, bottom offers several pore.
6. molten steel as claimed in claim 5 adds the device of high vapour pressure magnesium, wherein, offers bottom this embedded pipe Several apertures are less than the pore of pure magnesium grain.
CN201510381344.6A 2015-07-02 2015-07-02 Method and device for adding high vapor pressure magnesium to molten steel Expired - Fee Related CN106319155B (en)

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