共查询到19条相似文献,搜索用时 62 毫秒
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莱钢特钢厂用50t电炉-50t(LF+VD)精炼炉工艺流程生产含硼钢,钢中B元素控制非常重要。通过分析影响硼元素收得率的因素,对电炉及精炼炉各环节制定了严格生产工艺要点,保证了钢中有效酸溶硼含量控制在合格范围内。 相似文献
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通过系统研究硼含量精准控制技术,采用LF精炼短线喂硼线、钢水预判喂铝线、钛线固氮、提高保护浇铸效果等一系列措施,硼质量分数稳定在0.002 6%~0.003 0%,硼回收率88.2%~92.6%,实现转炉生产含硼中碳钢的硼含量稳定控制,开拓了含硼钢新的生产流程,降低了生产成本。 相似文献
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根据南钢低碳含硼钢BOF-LF-CC工艺制定取样方案,跟踪硼含量的变化.通过试验结果及理论热力学计算,分析了含硼低碳钢在生产过程中硼的损失机理,并提出了优化方案.结果表明:精炼过程中[B]与[O]、[N]、N2的反应不能自发进行,造成硼损失的主要原因是硼与空气中的O2发生氧化反应.因此,避免钢液中[B]与空气直接接触成为提高硼收得率的重要手段,从而提出了3点优化方案:①控制搅拌,防止钢液面与空气接触反应;②在精炼结束至中间包运输过程中对钢包采用加盖操作;③浇铸过程中加强钢液由中间包至结晶器之间密封保护. 相似文献
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冶炼硼钢控制硼含量的工艺实践 总被引:1,自引:0,他引:1
23~40MnB和27MnTiB等硼钢的炼钢流程为50 t EAF-LF+VD-CC工艺。通过控制EAF终点[C],出钢时用碳粉、钢芯铝、硅锰预脱氧,LF精炼前钢水溶解氧≤20×10-6,精炼渣碱度≥3.5,喂铝线控制LF末(FeO)+(MnO)≤1.5%(SiO2) ≤15% ,LF终点[Al]≥0.020%,喂钛铁包芯线,控制[Ti]0.030%~0.050%,同时喂硅钙包芯线控制钢中夹杂物形貌,并在VD脱气处理前底吹氩搅拌加入硼铁或喂入硼铁包芯线可有效地提高硼回收率至90%以上。 相似文献
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硼钢的淬透性和硼淬透性因子及硼平衡集聚的研究 总被引:1,自引:0,他引:1
研究了硼淬透性因子与硼的晶界平衡集聚规律、钢的成分、奥氏体化温度及晶粒尺寸的关系。建立了硼的晶界平衡集聚方程。导出了由钢的成分(碳和合金元素)定量计算硼淬透性因子的二元回归方程。考察了硼淬透性因子随奥氏体化温度变化的单峰曲线规律;研究结果表明,硼钢的淬透性与奥氏体化温度无关。本还对传统的计算淬透性用各种图表进行了回归分析,建立了硼淬透性因子等一系列淬透性计算的关系式。 相似文献
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Oxidation of Silicon and Boron in Boron Containing Molten Iron 总被引:4,自引:1,他引:3
A new process of directly smelting boron steel from boron containing pig iron has been established. The starting material boron containing pig iron was obtained from ludwigite ore, which is very abundant in the eastern area of Liaoning Province of China. The experiment was performed in a medium frequency induction furnace, and Fe2O3 powder was used as the oxidizing agent. The effects of temperature, addition of Fe2O3, basicity, stirring, and composition of melt on the oxidation of silicon and boron were investigated respectively. The results showed that silicon and boron were oxidized simultaneously and their oxidation ratio exceeded 90% at 1 400 ℃. The favorable oxidation temperature of silicon was about 1 300-1 350 ℃. High oxygen potential of slag and strong stirring enhanced the oxidation of silicon and boron. 相似文献
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At high temperatures of 900°C or more boron contained in steel escapes readily into an inert atmosphere as many scientists have already observed. The authors have investigated by theoretical analysis of the possible reasons for boron losses of unalloyed and low alloyed steels in an CH4/H2-atmosphere at 1000°C and 1 bar, i.e. boron volatilizes in elemental form, in form of boron oxide (B2O3) or as diborane (B2H6). It was proved that boron escapes from steel primarily as boron oxide, even if the atmosphere does not contain oxygen. Traces of oxygen in an annealing atmosphere seem to be sufficient to combine with the total boron content of the steel when being in the order of up to 100 ppm. A boron containing source such as boron oxide in sufficient amount in the annealing atmosphere can compensate boron losses of steels. 相似文献
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Ernest W. Dewing 《Metallurgical and Materials Transactions A》1990,21(9):2609-2609
In a recent paper[1] evidence was presented that boron was dimerized in dilute solution in liquid aluminum, and it was remarked in passing that
the same was very likely the case in copper. Yukinobuet
al.
[2] have now published their measurements of the activity of boron in molten copper, and they go far to substantiate the hypothesis. 相似文献
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