共查询到20条相似文献,搜索用时 140 毫秒
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炼钢过程主要是通过喷吹手段来达到脱碳、脱磷、脱硫、去夹杂等冶金目的,其过程涉及极其复杂的气-金-渣多相流行为和反应动力学,对其研究揭示是实现高效炼钢和钢超洁净化的重要基础,数值模拟已成为解析炼钢过程现象和机理不可或缺的手段.本文结合前人的工作,总结介绍了作者在转炉冶炼和钢包精炼过程数值模拟方面的研究进展.通过对转炉冶炼熔池内渣-金-气多相流行为的数值模拟,揭示了熔池混匀、炉衬冲刷、金属液滴喷溅等重要物理现象,同时通过耦合冶金热力学,定量描述了转炉内脱碳、脱磷等反应过程,优化了转炉吹炼工艺;基于Euler-Euler模型,描述了钢包吹氩精炼过程钢液湍流脉动诱导气泡扩散和气泡上浮诱导钢液湍流等重要现象,并利用CFD-PBM模型描述了夹杂物运动、碰撞聚合及去除行为,发现了气泡-夹杂物湍流随机碰撞去除夹杂物的新机理,同时通过CFD-SRM耦合模型实现了钢包精炼多组分参与渣-金反应和脱硫行为的定量描述,揭示了钢液与顶渣的成分、底吹模式对脱硫效率的影响规律.针对钢包底喷粉脱硫新工艺,提出了底喷粉过程中顶渣-钢液、空气-钢液、粉剂-钢液、气泡-钢液多界面多组分同时反应模型,考虑了气-液两相流、粉剂传... 相似文献
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为适应铁路运输向高速重载发展,车轴钢必须降低硫含量,减少钢中夹杂物以净化钢质。本文根据300t顶吹氧碱法平炉冶炼的车轴钢,在100t钢水罐内进行渣洗,喷吹CaO合成粉剂,吹氩等炉外精炼脱硫试验所取得的数据,分析了顶渣成分,钢中Als,「O,」「Al2O3」罐衬材料等对脱硫效果的影响,并提出了进一步提高精炼脱硫效率应采取的措施。 相似文献
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本文通过轴承钢GCrl5喷吹CaO基粉剂及Ca-Si粉的工业性实验,研究了铝镇静钢喷吹上述粉剂对钢中夹杂物影响的异同,结果表明:1)喷吹Ca-Si粉对钢中氧化物夹杂具有显著的变态作用.而喷吹CaO基粉剂仅仅表现为一种清扫效果,钢中氧化物夹杂主要为AI2O3.尺寸小于5μm,分布均匀。2)喷吹Ca-Si粉能有效地控制钢中硫化物的形态,但喷吹CaO-CaF:粉剂不能达到此种效果。3)当在CaO-CaF2粉剂中加人30?-Si粉剂时,基本达到单喷Ca-Si粉时的控制钢中硫化物形态的效果。氧化物中的总钙量比不加Ca-Si粉明显增加。4)喷吹CaO基粉剂及Ca-Si粉均能显著改善钢的清洁度。但后者钢中仍存在极少数尺寸大于20μm的大颗粒夹杂物。 相似文献
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通过分析喷吹气体、喷吹粉剂、过程化学反应、浸渍罩插入钢水、钢液面裸露以及包衬蓄热等过程对CAS-OB喷粉精炼工艺钢液温降的影响,建立了过程温降预测模型.模型计算结果表明:对喷吹气体加热以及成渣反应导致的钢液温降基本上可以忽略;在喷吹粉剂一定的情况下,钢液面产生裸露眼以及钢包烘烤温度低是引起钢液温降的主要因素.利用模型计算CAS-OB喷粉过程以及IR喷粉过程温降,得出在相同的处理时间内,前者要明显低于后者,这主要是因为CAS-OB喷粉过程将喷枪布置在浸渍罩内,渣面裸露面积小所致. 相似文献
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SPHC钢LF精炼过程的抑制回硅与脱硫研究 总被引:3,自引:0,他引:3
生产SPHC钢在LF处理脱硫过程中不能抑制回硅.根据热力学理论推导出降硅参数A/S和脱硫参数C/A,应用共存理论作用浓度模型,在试验渣系成分范围内计算CaO、SiO2、Al2O3的活度求解A/S和C/A,探讨了它们与w(CaO)/w(Al2O3)、w(CaO)/w(SiO2)的关系.分析结果认为,控制w(CaO)/w(Al2O3)、w(CaO)/w(SiO2)在合适的范围内,可以有效地分别或同时抑制回硅和脱硫.与试验结果对照得知,A/S和C/A分别与LF渣系的抑制回硅和脱硫能力相对应,根据A/S和C/A进行控制是可行的. 相似文献
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Kent Peaslee 《钢铁研究学报(英文版)》2010,17(7):1-1
The transformation of MgO·Al2O3 based inclusions in alloy steel during refining has been studied by industrial trials.Besides Factsage software is used to study the formation and modification of spinel inclusions in alloy steel using calcium treatment during refining process.The results show that the transformation sequence of inclusions is:MgO·Al2O3→CaO-Al2O3-MgO complex inclusions→MgO·Al2O3,and under present experimental condition,in order to avoid forming MgO·Al2O3 inclusions the content of dissolved Ca in the molten steel has to reach 1×10-6.Also the results show that when more calcium was added to molten steel,the content of Al2O3 and MgO will be lower.Besides,increasing the content of CaO in the inclusions will increase even if the content of SiO2 changes little. 相似文献
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The modification of MgO·Al2O3 spinel inclusions in Al-killed steel by Ca-treatment has been studied by industrial trials and ther-modynamic calculations.In the industrial trials,samples were taken systematically during the refining process in which the molten steel was treated by calcium,and the characters of the inclusions were analyzed using scanning electron microscopy (SEM) and energy dispersive spectra (EDS).The effects of Ca-treatment were evaluated by tracking the compositions of the inclusions.The results show that the modifi-Al2O3→MgO.Al2O3→liquid complex inclusions.The modification of spinel inclusions by Ca-treatment was calculated by FactSage6.0 util-izing its free-energy minimization routines.The results of thermodynamic calculations indicate that spinel inclusions are easier to be modi-fied than Al2O3 inclusions and the spinel inclusions in 30CrMo steel would transform to liquid complex inclusions when the content of dis-solved Ca in the molten steel exceeds 1×10-6.Also,the results show that adding more calcium into the molten steel would lower the contents of Al2O3 and MgO and increase the CaO content of the inclusions,while the change in SiO2 content is little. 相似文献
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使用 Al-Ca O作发热剂在中频感应炉内进行了钢液升温的实验研究 .对实验中影响升温热效率的因素进行了分析 ,在工业生产中本复合发热剂中铝的升温热效率可达 87% .在实验基础上 ,针对升温过程中钢液化学成分的变化还对 Al-Ca O复合发热剂的辅助效果进行了分析 ,得出了使用Al-Ca O作发热剂对钢液进行升温是可行的 ,升温同时兼具脱硫效果 ,并能有效防止连铸时中间包水口结瘤 . 相似文献
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摘要:针对超低碳铝脱氧镇静钢在冷轧冲压过程中出现开裂情况进行了电镜和能谱成分分析,确定了主要夹杂物含有Al2O3、CaO及MgO,为钙镁铝尖晶石类夹杂物。研究了该问题炉次的钢包顶渣组分、中间包覆盖剂及涂层侵蚀情况,讨论了夹杂物的来源。结果显示,Al2O3为脱氧产物及二次氧化的产物;CaO的来源为渣中较高活度的CaO与钢水中酸溶铝Als反应导致Ca元素进入钢水,进而与钢水中的O生成CaO。MgO主要为中间包覆盖剂氧化镁及涂层融蚀的氧化镁进入中间包渣系,与钢水中的Als反应导致Mg元素进入钢水,再与钢水中的O生成MgO。 相似文献
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The cracking of ultra low carbon Al deoxidized killed steel during cold rolling and stamping was analyzed by SEM and EDS. It was determined that the main inclusions consisted of Al2O3, CaO and MgO, which are Ca-Mg-Al spinel inclusions. The composition of the ladle top slag and corrosion of the tundish covering agent and coating were investigated, and the source of inclusions was discussed. It was found that Al2O3 is the product of deoxidation and secondary oxidation. The source of CaO is the reaction between CaO of higher activity in slag with acid soluble aluminum Als in molten steel, which leads to the entry of element Ca into molten steel and the formation of CaO with oxygen in molten steel. The reaction of MgO, which comes from MgO in tundish covering slag and MgO corroded from tundish coating, with Als in molten steel leads to element Mg entering molten steel, and then MgO is formed with oxygen in molten steel. 相似文献