共查询到20条相似文献,搜索用时 187 毫秒
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通过对首钢京唐公司300t炼钢转炉→LF精炼→RH精炼→CC连铸各工序氮质量分数控制的研究,探讨影响钢中氮质量分数的因素和控制措施,结合生产实践,提出强化转炉冶炼操作、LF埋弧造渣、保证RH真空度和连铸全保护浇铸等工艺优化措施,尤其是控制LF精炼增氮和发挥RH精炼脱氮功能,改进后LF精炼增氮量小于0.001 0%;RH精炼可将氮质量分数脱至0.0030%,连铸增氮量平均为0.000 14%,首钢京唐管线钢成品氮质量分数平均为0.0031%,达到先进企业的水平。 相似文献
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本文研究了齿轮钢生产过程中氮含量的变化,通过在不同工序取样分析,找出了增氮的主要工序,对这些工序深入研究并加以改进,降低了齿轮钢中的氮含量。研究发现,转炉放钢过程、LF精炼、连铸浇注过程增氮显著;通过采取优化转炉出钢口的尺寸和形状、精炼降低通电时间增大渣量埋弧操作、钢包中间包水口双重保护浇注。在无脱气设备的情况下,可将齿轮钢在整个生产过程中的增氮量比原来降低30%以上,达到国内领先水平。通过整个生产系统的工艺优化和改进,使齿轮钢中的氮含量控制在40×10-6以下。 相似文献
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介绍了管线钢中氮的危害,结合管线钢化学成分和生产工艺,分析氮的来源、溶解和扩散机理,基于转炉冶炼、LF炉精炼、RH炉精炼、连铸等生产工艺特性,对不同工序钢水中氮的数据进行采集和分析,系统研究提高转炉吹炼命中率、改善造渣制度、强化出钢管理、全程底吹Ar控制,LF微正压操作,RH真空处理,连铸保护浇注等措施对降氮和控氮的影响,指出连铸坯氮含量偏高的主要原因。为管线钢冶炼的降氮和控氮,强化重点工艺环节的控制,优化改进控制工艺,提供了科学依据,形成了一套全工序控制钢水氮的措施,确保高级管线钢中氮质量分数控制在0.0045%以下。 相似文献
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对中厚板卷厂转炉、精炼、连铸三道工序中有可能增氮的环节进行剖析,提出针对性解决措施。通过出钢前提前打开钢包底吹、弱脱氧工艺出钢、强化精炼操作避免钢水裸露、连铸保护浇注等手段有效地降低了钢液中氮含量。 相似文献
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针对"铁水预处理—转炉—精炼—连铸"工艺,结合薄板钢生产实践,系统分析了转炉吹炼过程、LF精炼过程、连铸浇注过程增氮因素。连铸保护浇注可以稳定控制增氮量低于5×10~(-6)。介绍了薄板钢生产所采取的有效措施,实现薄板钢氮含量(体积分数)稳定控制在35×10~(-6)以内。 相似文献
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During the high nitrogen steel (HNS) melting process, the absorption reaction of nitrogen in the liquid steel by blowing NH_3 and N_2 was investigated respectively. In order to obtain higher content of nitrogen in steel, the liquid steel should be deoxidized and desulfurized because the oxygen and sulfur as surface activity element are not fa-vorable to the absorption of nitrogen in melting process. Based on the metallurgical thermodynamics, the coupling re-action of NH_3 with oxygen can improve the generation of activity nitrogen atom in liquid steel. Nitrogen atom is easi-er to be absorbed than nitrogen molecule. At the same time, blowing ammonia gas can remove the oxygen from liquid steel and decrease the inclusion in the steel. Experiments of HNS melting were carried out in a 10 kg induction fur-nace, and the results indicated that for liquid steel containing the same content of alloys and blowing the same mole of nitrogen, the absorption effect of nitrogen by blowing NH_3 is obviously higher than that of blowing N_2. The techni-cal process of melting HNS by blowing NH_3 under normal pressure is feasible in industrial production. 相似文献
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研究了40 t LF炉精炼AISI410不锈钢时,在常压下吹氮气增氮工艺(吹氮流量、吹氮时间及钢液温度)对AISI410不锈钢氮含量的影响,建立了AISI410不锈钢氮溶解度热力学计算模型。结果表明:钢中氮含量随着吹氮时间、氮气流量的增加而增大;常压下吹氮10 min,钢液含氮量可达到0.05%;随着氮流量增加钢液达到饱和的时间缩短,氮的溶解度随着钢液温度的降低而升高。应用热力学模型进行了分析,不同吹氮条件下氮溶解度实测值与热力学模型计算值较吻合。为LF炉精炼含氮不锈钢控制氮含量提供了理论依据。 相似文献
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MA Shao-hua 《钢铁研究学报(英文版)》2010,17(2):6-6
Abstract: During the HNS melting process, the absorption reaction of Nitrogen in the liquid steel by blowing NH3 and N2 was investigated respectively. In order to obtain higher content of nitrogen in steel, the liquid steel should be deoxidized and desulfurized because the [O] and [S] as surface activity element is not favorable to absorb nitrogen in melting process. Based on the metallurgical thermodynamics, the coupling reaction of NH3 with [O] can improve the generation of activity nitrogen atom in liquid steel. Nitrogen atom is easier to be absorbed than nitrogen molecule. At the same time, blowing ammonia gas can remove the oxygen from liquid steel and decreased the inclusion in the steel. Experiments of HNS melting in ten-kilogram inductive furnace indicated that, for liquid steel with same content of alloys and blowing the same mole of nitrogen , the absorption effect of nitrogen by blowing NH3 increase 18~75% than that of blowing N2.The technical process of melting HNS by blowing NH3 under normal pressure is feasible in industry production.h 相似文献
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According to the analysis related to kinetic mechanism of vacuum denitrogenation and combining with the actual production of RH-MFB (a combination of Ruhstahl-Hausen vacuum degassing process with a multifunctional oxygen lance) at Liansteel, the limit step and model equation of vacuum denitrogenation are determined. Meanwhile, the influencing factors of nitrogen removal from liquid steel in vacuum of RH-MFB are analyzed. The results show that the limit step of vacuum denitrogenation in RH-MFB is the mass transfer of nitrogen in liquid boundary layer and the reaction follows first order kinetics. Keeping the necessary circulation time under the working pressure (67 Pa) is helpful to nitrogen removal from steel. The oxygen content in molten steel has little influence on the removal of nitrogen after deep deoxidation, while the sulphur content in liquid steel is always relatively low and has little effect on denitrogenation. The sharp decrease of carbon content in steel drives the process of denitrogenation reaction so as to exhibit a faster denitrogenation rate. The interfacial chemical reaction and argon blowing play a major role in the nitrogen removal when the carbon content in liquid steel is stable. 相似文献
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分析了85 t VOD精炼时相关工艺参数对超纯铁素体不锈钢00Cr18Mo2和00Cr17Mo终点氮含量的影响。结果表明,随初始碳含量增加,初始氮含量降低,钢水温度提高,适当增加脱氮时间,VOD钢水终点氮含量降低;当控制钢水初始碳含量0.4%~0.9%、处理温度≥1 590℃、真空度≤70 Pa、脱氮时间15~20 min、吹氩搅拌强度8~15 L/(min·t)、初始氮含量≤0.017 0%,VOD终点钢水氮含量为0.006 4%~0.009 5%。 相似文献
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