共查询到20条相似文献,搜索用时 31 毫秒
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针对低碳低硅钢LF精炼过程脱硫与增硅问题,通过经典热力学分析了脱硫与增硅的规律。计算表明,当钢中w(Al)≥0.01%,即可将S质量分数降至0.01%以下,继续提高Al含量则增加钢液增硅的趋势。工业实践结果与热力学计算表现出较好的一致性。实际生产中,在钢中的S质量分数低于0.02%的条件下脱硫,钢液的增硅量也将增大,最大的增硅质量分数达到0.031 8%;钢液的脱硫量越大,增硅量也越大,当钢中脱除质量分数0.067%的硫时,对应增硅质量分数约0.03%。冶炼中应结合到站Al和S含量综合考虑白灰和铝粒加入量进行造渣,LF精炼结束w(Al)为0.032%~0.038%,精炼渣碱度最适区间为9~11,渣中w(TFe+MnO)为0.6%~0.7%,可同时满足脱硫和减少增硅。 相似文献
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通过对低碳低硅钢增硅问题进行分析,明确了在当前工艺条件下精炼脱S任务重、转炉下渣量大、精炼时间偏长是增硅的主要影响因素,提出了100%铁水预脱硫处理等四条改进措施,[Si]合格率由83.3%提高到91.8%,效果十分明显. 相似文献
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针对梅钢低硅钢脱硫时存在增硅的现象,进行了适合低硅钢脱硫用合成渣。详述了适合梅钢低硅钢脱硫使用的合成渣渣系的选择,经实验室研究开发出了适合低硅钢使用且具有脱硫、改性功用的合成渣。通过现场工业试验,达到预期效果。 相似文献
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分析了5t锭纯铁电渣重熔过程增碳和脱硫率低的原因。通过将~70%萤石、~30%氧化铝粉、3%~7%SiO_2、0.05%~0.09%C的原渣系改成65%萤石、25%氧化铝粉、10%生石灰、≤1%SiO_2、≤0.02%C的新渣系,采用1t电渣锭并将结晶器填充比由30%提高到45%、电渣重熔过程向渣中加铝粉等工艺措施,使电渣重熔纯铁的最大增C量由0.067%降至0.001%,平均脱硫率由41%~46%增至53.4%~78.0%,电渣锭碳、硫含量均≤0.003%,满足了超低碳-超低硫纯铁YT01B的质量要求。 相似文献
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Saeed N. Ghali 《国际钢铁研究》2013,84(5):450-456
This article aims to investigate the effect of soluble and insoluble nitrogen on mechanical properties of stainless steels. Reference steel contains about 14.42%Ni and 0.012%N. Two developed steels have the same base chemical composition of the reference steel except Ni and N contents. One of the developed steels has 6.54%Ni and 0.232%N and the other has 0.452%N and nearly nickel free (0.089%Ni). The produced steels were forged, heat‐treated, and tempered. The microstructure of steels was mainly austenite, and grain size decreases as nitrogen content – especially nitrides‐increases. Yield and ultimate tensile strength of reference steel are less than that of steels containing nitrogen. Strengthening mechanisms contribution to the strength of both soluble and insoluble nitrogen had been analyzed. 相似文献
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C波段单片低功耗低噪声放大器 总被引:1,自引:0,他引:1
报道了一种新型的C波段 0 .5μmPHEMT单片低功耗低噪声放大器。该放大器由三级级联构成 ,采用电流回收技术 ,实现了低功耗的目的。芯片面积为 2 .1× 1 .8mm2 ,直流功耗为 1 2 5mW (VD=5V ,ID≤ 2 5mA)。封装后测试结果为 :在C波段 ,带宽 1 .1GHz,增益 >2 5 .7dB ,增益平坦度≤± 0 .6dB ,噪声系数≤ 1 .72dB ,输入、输出电压驻波 <2∶1 ;带内最小噪声系数为 1 .61dB ,相关增益为 2 6 .3dB。测量结果与设计符合得较好。 相似文献
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电炉生产低碳低硅钢的难点是电炉的终点控制、脱氧合金化以及钢中[Al]的控制和精炼炉抑制回硅.介绍了八钢110t电炉生产SPHC钢从原材料到冶炼过程严格按标准化操作,电炉精炼及连铸全程保护浇注,防止钢水的二次氧化减少夹杂物带入的生产实践. 相似文献
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RL Jurado C del Rio G Nassar J Navarette JL Pimentel 《Canadian Metallurgical Quarterly》1998,91(7):624-629
BACKGROUND: The purpose of this review is to provide a differential diagnosis for a low anion gap. METHODS: We describe the anatomy of the anion gap. Also, we follow-up with a review of the English-language literature describing the causes of a low anion gap. During the past 15 years, the introduction and widespread clinical use of ion-selective electrode methodology for measuring serum electrolyte values has caused a major fall in the normal range of the anion gap from 12 mEq/L +/- 4 mEq/L to 6 mEq/L +/- 3 mEq/L; therefore, a new definition for a low anion gap is in order. RESULTS: Based on current clinical data, an anion gap value of < 3 mEq/L should be considered low. A low anion gap is a useful diagnostic tool, but its clinical significance is often unrecognized. Also, it may be a handy clinical clue for the diagnosis of life-threatening intoxications or occult neoplasms, such as multiple myeloma. The baseline low anion gap may mask the identification of a high gap metabolic acidosis in certain patients. CONCLUSIONS: Interpretation of a low anion gap can provide valuable clinical information. 相似文献
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B Hainline 《Canadian Metallurgical Quarterly》1995,14(1):241-265
Low back injuries occur commonly in tennis, but the pathophysiologic, biomechanical, and clinical characteristics are not well defined. Tennis players may be at an increased risk of lumbar disc pathology from rotational and hyperextension shearing effects. Treatment of low back injury at present is empiric, but sport-specific lumbar stabilization and unloading of the lumbar disc should be developed. Prospective longitudinal research protocols are needed to study the lumbar spine in tennis players. 相似文献
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通过优化转炉出钢、CAS精炼、RH处理等过程的脱氧工艺和造渣制度,形成合理的钢包精炼渣系,为充分吸附钢水中的夹杂物创造良好条件;利用钙处理工艺,将钢水中的Al2O3夹杂球化,使钢中大部分Al2O3转变为液态Ca O-Al2O3,为连铸机顺利浇铸创造条件;按照KR→BOF→CAS→RH→CCM工艺路线生产低碳低硅铝镇静钢,将钢水中的Si含量控制在了钢种成分设计要求范围之内。 相似文献