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贺道中 《湖南冶金职业技术学院学报》2007,7(4):111-114
结合涟钢薄板坯连铸工艺技术,介绍了薄板坯连铸保护渣的设计技术特点和进口中碳钢保护渣的应用情况,重点分析了薄板坯连铸机的国产中碳钢保护渣的冶金性能的优化及改进. 相似文献
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结合涟钢薄板坯连铸工艺技术,介绍了薄板坯连铸保护渣的设计技术特点和进口中碳钢保护渣的应用情况,重点分析了薄板坯连铸机的国产中碳钢保护渣的冶金性能的优化及改进。 相似文献
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重钢炼钢厂板坯连铸结晶器保护渣优化选择 总被引:1,自引:0,他引:1
本文对重钢炼钢厂所生产的几大类品种钢的凝固特性及连铸板坯表面微裂纹的形成机理进行了分析,结合连铸保护渣的特性探讨,并通过对几大类品种钢连铸保护渣的生产试验和性能优化选择,使板坯表面微裂纹得到有效控制,基本形成了板坯连铸保护渣系列化。 相似文献
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薄板坯连铸结晶器保护渣技术 总被引:12,自引:0,他引:12
综述了薄板坯连铸工艺技术的特点及应用于薄板坯连铸工艺的保护渣发展现状,阐述了薄板坯连铸保护渣物理性能及冶金特性,分析了化学万分的影响,提出了薄板连铸结晶器保护渣应用中的问题。 相似文献
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分别测定了不同碳质材料(石墨和活性炭)和不同碳质量分数(2.6%-3.2%)的低碳连铸保护渣在空气中和在氩气中的熔化速度,结果是在有惰性气体保护下的熔化速度远小于一般在空气中的熔化速度。文中还分别研究了3种还原剂(Si—Ca合金粉、Si—Al-Ca-Ba合金粉、Al粉)对同一种低碳(碳质量分数为2.6%)连铸保护渣熔化速度的影响,结果是加入还原剂的熔化速度远小于不加还原剂的熔化速度,其中Al对降低熔化速度的作用相对最大。 相似文献
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概述了高拉速连铸的特点及对保护渣的要求,总结了国内外近年来在高拉速用连铸保护渣方面的研究、生产和应用现状。重点介绍了国内外近年来有关高拉速板坯连铸保护渣中各成分对粘度、熔化温度、熔化速度的影响以及保护渣生产制造工艺的研究成果和应用实例。 相似文献
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吸收三氧化二铝夹杂仪是为了配合连铸结晶器保护渣和连铸中间包覆盖剂的研究面研制的,现已能满足冶金用渣实室测试的要求,测定结果与北京钢研总院和重庆大学的结果相比较数量级安全一致。 相似文献
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In patients with impaired cell-mediated immune responses (e.g., lung transplant recipients and AIDS patients), cytomegalovirus (CMV) infection causes severe disease such as pneumonitis. However, although immunocompetency in the host can protect from CMV disease, the virus persists by evading the host immune defenses. A model of CMV infection of the endothelium has been developed in which inflammatory stimuli, such as the CC chemokine RANTES, bind to the endothelial cell surface, stimulating calcium flux during late times of CMV infection. At 96 h postinfection, CMV-infected cells express mRNA of the CMV-encoded CC chemokine receptor US28 but do not express mRNA of other CC chemokine receptors that bind RANTES (CCR1, CCR4, CCR5). Cloning and stable expression of the receptor CMV US28 in human kidney epithelial cells (293 cells) with and without the heterotrimeric G protein alpha16 indicated that CMV US28 couples to both Galphai and Galpha16 proteins to activate calcium flux in response to the chemokines RANTES and MCP-3. Furthermore, cells that coexpress US28 and Galpha16 responded to RANTES stimulation with activation of extracellular signal-regulated kinase, which could be attributed, in part, to specific Galpha16 coupling. Thus, through expression of the CC chemokine receptor US28, CMV may utilize resident G proteins of the infected cell to manipulate cellular responses stimulated by chemokines. 相似文献
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F Liao R Alderson J Su SJ Ullrich BL Kreider JM Farber 《Canadian Metallurgical Quarterly》1997,236(1):212-217
STRL22 is a human seven transmembrane domain orphan receptor related to known chemokine receptors and expressed in peripheral blood lymphocytes, tumor infiltrating lymphocytes and lymphoid tissues. MIP-3alpha/LARC/Exodus is a CC chemokine that is chemotactic for lymphocytes and that is expressed in activated cells, including monocytes, T cells, endothelial cells, and fibroblasts, and in liver, lung, and some lymphoid tissues. We report here that STRL22-transfected human embryonic kidney 293 cells demonstrated specific binding for MIP-3alpha and that MIP-3alpha, but no other chemokines, produced a calcium flux in the STRL22-transfected cells. We show that MIP-3alpha, unlike other chemokines, produced a calcium flux in freshly-isolated peripheral blood lymphocytes and we show that MIP-3alpha also produced a signal in tumor infiltrating lymphocytes that express STRL22. Since STRL22 is the sixth functional CC chemokine receptor identified, it should be re-named CCR6. 相似文献
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对改进薄板坯质量的几项操作作了介绍,涉及消除薄板坯表面的纵裂和横裂,减少水口的堵塞,降低钢中含N量,结晶器保护渣的合理选用等方面。 相似文献
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MA超低碳钢(/%:≤0.005C,0.007~0.012Si,0.07~0.15Mn,≤0.025P,≤0.025S,≤0.035Als,≤0.0020N)的生产流程为KB-150 t BOF(终点[C]≤0.020%)-RH-200 mm板CC工艺。试验分析了结晶器保护渣,中间包覆盖剂,钢包耐火材料对钢液增碳量影响。结果表明,结晶器增碳量(△C 0.0003%~0.0008%)明显高于中间包增碳量(△C 0.0001%~0.0005%),通过稳定冶金操作,控制保护渣原始碳量为1%~2%,向保护渣中添加MnO2(3.5%~4.0%),控制覆盖剂量等工艺措施,可有效地减少钢液增碳。 相似文献