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高速铁路钢轨暂行技术条件要求成品钢轨的w [O]≤20×10-6,文中进行了钢中氧控制的热力学分析,对SiCa和SiBaCa合金的无铝脱氧进行了工业试验,分析了钢中夹杂物的行为.试验结果:采用SiBaCa合金脱氧能够控制钢中w [O]≤20×10-6,且钢中夹杂物呈现复合状态. 相似文献
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社会发展过程中对于钢材方面的资源的需求相对较大,尤其是汽车制造以及建筑领域还有工业等领域应用相对较为广泛.近些年来,经济领域以及社会发展相对较快,同时对于钢材资源的需求也相应的增加,并且对于钢材的纯净度方面的要求也相对提高.钢材中夹杂物的存在对于钢材的纯净度具有着直接性的影响.文章主要由钢材夹杂物的主要来源以及分部情况... 相似文献
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减少炼钢连铸钢中夹杂物的工艺措施 总被引:2,自引:0,他引:2
对钢中夹杂物的来源、分布以及危害进行了叙述,着重介绍了炼钢和连铸工艺中减少夹杂物的脱氧净化、电磁净化、固体电解质净化、钢包净化、过滤净化等生产工艺措施,认为钢中的夹杂物不可能都要降到最低,应根据不同材料和用途将夹杂物减少到合适的水平即可 相似文献
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对大冶第一炼钢厂,马钢第一炼钢厂。大冶耐火材料耐火厂,马钢耐火厂,湖洲耐火厂生产的铸锭用耐火材料质量及铸锭工艺操作的考察,了解到大冶的铸锭工艺操作比马钢细,要求双马钢严,所用的耐火材料比马钢好。因此,我们认为就铸锭工艺而言,清干燥,铸锭操作,耐材质量、保护浇注工艺是影响车轮的轮箍钢低部夹杂的主要因素。 相似文献
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转炉-精炼-连铸过程钢中氧的控制 总被引:17,自引:1,他引:16
结合近年来的文献和笔者的研究工作,概要论述了转炉—精炼—连铸过程中钢洁净度(以总氧含量T[O]表示)的控制及夹杂物对产品质量的影响。提高钢的洁净度应从产生夹杂物的源头抓起,尽可能降低转炉终点氧含量。根据生产统计数据,建立了转炉终点氧预报模型。介绍了硅镇静钢、硅铝镇静钢、铝镇静钢三种脱氧模式及脱氧产物的控制方法。采用钢包精炼方法把夹杂物消灭在钢水进入结晶器之前是获得“干净”钢水的关键。介绍了RH、LF、中间包钢水总氧预报模型。介绍了在连铸过程中防止钢水再污染和进一步去除夹杂物的措施。 相似文献
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对钢中夹杂物的来源、分布以及危害进行了叙述。着重介绍了炼钢和连铸工艺中减少夹杂物的脱氧净化、电磁净化、固体电解质净化、钢包净化、过滤净化等生产工艺措施,认为钢中的夹杂物不可能都要降到最低,应根据不同材料和用途将夹杂物减少到合适的水平即可。 相似文献
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Based on the on-site investigation and the principle of compressible flow, the working oxygen pressure should be matched to the Mach-number at the nozzle in designing nozzle and oxygen supply schedule so that the higher penetration depth and the more blending energy can be obtained for reducing energy loss by shock wave in the ultrasonic oxygen jet in the normal BOF steelmaking. For some special BOF blowing technologies, such as steelmaking with high phosphorus hot metal, post combustion oxygen lance, hot metal pretreatment, etc, the difference between working oxygen pressure and designed diffusion pressure which is related to Mach-number is necessary, so that the velocity of the oxygen jet will be decreased because of shock wave for expected metallurgical results. 相似文献
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A novel process control model for basic oxygen furnace (BOF) steelmaking is proposed based on metallurgy mechanism, with lower contents of carbon, manganese, silicon, and lower temperature in semi‐steel after extracting vanadium. According to mass balance and heat balance, a static control model is built up, with slagging model, temperature model, and oxygen supply model. When actual amount of oxygen supply reaches 85% of theoretical value calculated by static model, quasi‐dynamic control model is activated to predict carbon and temperature in later period of steelmaking. A steelmaking process control system for semi‐steel smelting on 120 tonne BOF is developed in a steelmaking plant in China. Based on test of three steel grades, this model acts a guide for BOF steelmaking with semi‐steel, not only providing tactic, but also pointing out a feasible method for BOF process control without sub‐lance or off‐gas analyzer. 相似文献
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回顾了氧气炼钢工艺的发展历程和10个里程碑事件,描述了自热式转炉、吹氧强度达5m3/(t·min)的高速转炉以及采用添加煤、二次燃烧和废钢比可达50%的他热式转炉,给出了相应的操作结果。介绍了一种基于铁水和铬矿的新工艺路线,304钢的生产成本可节省100美元/t以上。归纳了电弧炉和氧气转炉的结合并比较了二者的脱碳速度,介绍了优化电弧炉用氧的精炼烧嘴。展望了全球氧气炼钢的灵活性和发展前景。 相似文献
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Removal of impurity elements from hot metal is essential in basic oxygen steelmaking. Oxidation of phosphorus from hot metal has been studied by several authors since the early days of steelmaking. Influence of different parameters on the distribution of phosphorus, seen during the recent work of the authors, differs somewhat from that reported earlier. On the other hand, removal of sulphur during steelmaking has drawn much less attention. This may be due to the magnitude of desulphurisation in oxygen steelmaking being relatively low and desulphurisation during hot metal pre‐treatment or in the ladle furnace offering better commercial viability. Further, it is normally accepted that sulphur is removed to steelmaking slag in the form of sulphide only. However, recent investigations have indicated that a significant amount of sulphur removed during basic oxygen steelmaking can exist in the form of sulphate in the slag under oxidising conditions. The distribution of sulphur during steelmaking becomes more important in the event of carry‐over of sulphur‐rich blast‐furnace slag, which increases sulphur load in the BOF. The chemical nature of sulphur in this slag undergoes a gradual transition from sulphide to sulphate as the oxidative refining progresses. 相似文献