CN110564910A - 一种中频炉炉衬 - Google Patents
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- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
- C21C5/52—Manufacture of steel in electric furnaces
- C21C5/5241—Manufacture of steel in electric furnaces in an inductively heated furnace
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D1/00—Casings; Linings; Walls; Roofs
- F27D1/04—Casings; Linings; Walls; Roofs characterised by the form, e.g. shape of the bricks or blocks used
- F27D1/045—Bricks for lining cylindrical bodies, e.g. skids, tubes
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D1/00—Casings; Linings; Walls; Roofs
- F27D1/10—Monolithic linings; Supports therefor
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D1/00—Casings; Linings; Walls; Roofs
- F27D1/04—Casings; Linings; Walls; Roofs characterised by the form, e.g. shape of the bricks or blocks used
- F27D1/045—Bricks for lining cylindrical bodies, e.g. skids, tubes
- F27D2001/047—Lining of cylindrical vessels
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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Abstract
本发明公开了一种中频炉炉衬。该炉衬由炉衬本体、渣线层和透气塞组成。透气塞为弥散式透气,位于炉底中心。渣线层位于炉衬本体的上部,采用渣线砖砌筑,所述渣线砖在安装平面上分别加工相互配合的凸块和凹槽,两个安装平面夹角为15°,渣线砖的外圆弧与炉衬本体的外圆尺寸一致,内圆弧与炉衬本体的内圆尺寸一致,渣线砖与炉衬本体接触的上下表面均匀遍布有凸尖。该炉衬可实现钢水净化,为生产优质铸件提供了条件。使用该炉衬冶炼的钢水,其气体含量及硫磷含量达到精炼水平,合金元素收得率大大增加。
Description
技术领域
本发明应用于铸造领域,具体涉及一种用于钢水熔炼的中频炉炉衬。
背景技术
铸造行业中,铸钢熔炼多采用中频炉,由于中频炉炉衬限制,钢水熔炼始终与空气接触,钢水无法净化,也就无法进行高质量铸钢件的生产。
中频炉炉衬一般分为酸性炉衬、中性炉衬和碱性炉衬。酸性炉衬以氧化硅为主要成分,中性炉衬以氧化铝为主要成分,碱性炉衬以氧化镁为主要成分。由于酸性炉衬熔点低,碱性炉衬热震性差,铸钢熔炼多采用中性炉衬或镁铝尖晶石碱性炉衬。但是中性氧化铝炉衬无法造渣净化钢水,所以必须使用镁铝尖晶石碱性炉衬。即使这样,炉衬使用寿命很低,一般情况下,炉衬其他部位良好的情况下,在造渣的渣线位置炉衬腐蚀极其严重,有时一炉可造成漏炉事故,所以从铸造行业来说中频炉无法炼钢。
发明内容
本发明解决的技术问题是:提供一种中频炉炉衬,满足造还原渣的要求,使得钢水净化,生产优质铸钢件。
本发明所采用的技术方案是:中频炉炉衬由镁铝尖晶石炉衬本体、渣线层和高铝质透气塞组成。所述透气塞为弥散式透气,位于炉底中心。所述渣线层位于炉衬本体的上部,采用专用渣线砖砌筑,所述渣线砖为镁碳砖,高度大于还原渣的渣层厚度,渣线砖在安装平面上加工相互配合的凸块和凹槽,凸块或凹槽在安装平面上优化设计为两个,渣线砖的两个安装平面夹角为15°;渣线砖的两个圆弧表面半径之差值为炉衬厚度,其外圆弧与炉衬本体的外圆一致,内圆弧与炉衬本体的内圆一致;在渣线砖与炉衬本体接触的上下表面均匀遍布有凸尖。
本发明的有益效果是:该炉衬可造还原渣,实现了中频炉净化钢水的目的,为铸造行业生产优质铸件提供了条件。使用该炉衬冶炼的钢水,其气体含量及硫磷含量达到精炼水平,合金元素收得率大大增加。
附图说明
图1为本发明炉衬结构示意图;
图2为渣线砖俯视图;
图3为图2主视图;
图4为渣线砖炉衬平面示意图;
图5为渣线砖第二种结构形式;
图6为渣线砖第三种结构形式;
图7为渣线砖第四种结构形式;
其中:1-炉衬本体、2-渣线层、3-透气塞、4-凸块、5-凹槽、6-凸尖。
具体实施方式
附图1为本发明中频炉炉衬结构示意图。中频炉炉衬由炉衬本体1、渣线层2和透气塞3组成。为满足铸钢高温熔炼和成本要求,炉衬本体1采用镁铝尖晶石,渣线层使用附图2-3所示结构的渣线砖,渣线砖为镁碳砖,可满足还原渣造渣要求。透气塞3为高铝质耐火材料,弥散式透气,位于炉底中心,从中频炉炉底吹入惰性气体,促进钢水净化。
附图2和附图3分别为渣线砖的俯视图和主视图,渣线砖在安装平面上分别加工相互配合的凸块4和凹槽5,安装平面上最好是两个凸块4或两个凹槽5,凸块4和凹槽5配合安装形成的炉衬平面示意图见附图4,凸块4和凹槽5之间的配合即起到定位作用,也起到增加密封作用,防止钢水穿透渣线层造成漏钢。两个安装平面夹角为15°,夹角15°保证渣线砖可组合为一个密闭的正圆。渣线砖两个圆弧半径之差值为炉衬厚度,外圆弧与炉衬本体1的外圆尺寸一致,内圆弧与炉衬本体1的内圆尺寸一致。在与上下炉衬本体接触的平面上,均匀遍布有凸尖6,凸尖6可增加与上下炉衬本体的结合力。
附图5、附图6和附图7分别为为渣线砖的不同结构形式,与附图2的区别在于,凸块4和凹槽5的形状、位置、数量有所区别。类似可相互配合的凸块4和凹槽5的形状不一一列举。
使用本发明中频炉炉衬冶炼钢水,可进行氧化脱磷,造还原渣脱氧、脱硫,合金化,还可以从炉底吹入惰性气体进行钢水净化。由于镁碳砖不耐受氧化渣,钢水的氧化脱磷最好在钢包中进行,扒渣后,将脱磷钢水倒入中频炉内,造还原渣,进行合金化和底吹氩净化钢水。具体冶炼步骤包括:1)氧化期。金属原料熔化,钢水出钢到钢包内,加入石灰等造渣辅料,钢管吹氧脱磷。扒掉钢包内的氧化渣,脱氧后的钢水倒入中频炉;2)还原期。熔化完的钢水在造还原渣前,其液面不得低于渣线层的最底线。加入石灰等造渣辅料熔化,同时加入脱氧剂造还原渣,还原渣厚度不低于50mm,渣层厚度在渣线砖高度范围内;3)合金化净化期。还原渣状态下取样分析,加入合金料合金化,炉底吹氩净化钢水,搅动的钢水不得露出还原渣层。在钢水搅动过程中,钢水中的夹杂随着钢水搅动上浮,与还原渣在钢渣界面反应,实现脱氧脱硫,其他夹杂与还原渣粘接,从钢水中分离,达到去除钢水中氧化物、硫化物及其它夹杂的目的。同时,吹入钢水中的氩气,可吸附钢水中的氮氢氧气体,将这些气体带出钢水,实现降低钢水中气体含量的作用。待钢水成分调整合格后,升温准备出钢;4)出钢时钢渣混出,增加钢渣反应界面,进一步去除夹杂。扒掉钢包中的还原渣,加入保护渣,熔化后吊至浇注工位。
如果钢水熔炼不需要氧化期,在上述冶炼步骤中,可去除钢包内吹氧氧化期,钢水熔化完成后,直接造还原渣,进行钢水净化处理。
该炉衬与钢包一起,尤其是镁碳渣线砖的使用,改变了中频炉不能炼钢的传统看法,实现了中频炉冶炼,有氧化期脱磷、还原期脱氧脱硫、出钢前吹氩气精炼等过程,使得中频炉能够冶炼和净化钢水,为铸造行业生产优质铸件提供了冶炼条件。
本中频炉炉衬的使用,不仅满足造还原渣的要求,大大降低了钢水中的夹杂含量,达到净化钢水的目的,而且合金化时还可提高合金元素的收得率。下表1为熔炼不锈钢等高合金钢时,各合金元素合金化收得率,可见Ti、Al元素收得率明显提升,比常规30%左右的收得率提高2倍以上。Cr、Mo合金元素收得率为100%,高于常规90-96%的收得率。
表1 合金元素收得率
元素 | Cr | Ni | Mo | Cu | Nb | Ti | W | V | Al |
收得率 | 100% | 100% | 100% | 100% | 100% | 60-85% | 100% | 100% | 60-85% |
本中频炉炉衬的使用,净化钢水后的气体含量和硫磷含量达到精炼水平。表2为熔炼低合金钢时,钢水的气体含量及硫磷含量,可见,已经与炼钢精炼水平相当,其冶炼质量已经达到精炼水平。
表2 有害元素含量
元素 | N/ppm | H/ppm | O/ppm | P/% | S/% |
含量 | 80-180 | 1.2-2.2 | 30-110 | 0.015-0.025 | 0.004-0.009 |
Claims (2)
1.一种中频炉炉衬,其特征在于:由镁铝尖晶石炉衬本体(1)、渣线层(2)和高铝质透气塞(3)组成;所述透气塞(3)弥散式透气,位于炉底中心;所述渣线层位于炉衬本体(1)的上部,采用专用渣线砖砌筑,所述渣线砖为镁碳砖,高度大于精炼渣层厚度;所述渣线砖在安装平面上加工相互配合的凸块(4)和凹槽(5),两个安装平面夹角为15°;所述渣线砖的两个圆弧表面半径之差值为炉衬厚度,其外圆弧与炉衬本体(1)的外圆一致,内圆弧与炉衬本体(1)的内圆一致;所述渣线砖与炉衬本体(1)接触的上下表面均匀遍布有凸尖(6)。
2.根据权利要求1所述的一种中频炉炉衬,其特征在于:所述安装平面上的凸块(4)或凹槽(5)数量为两个。
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