共查询到19条相似文献,搜索用时 156 毫秒
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本文研究了加热炉少氧化控制数学模型.通过高温氧化试验,确定了可用于加热炉少氧化最优控制的钢坯的氧化量与钢坯温度、气氛及时间之间的关系,并通过钢坯加热炉气氛计算,把氧化因素引入加热炉最优控制的目标函数中,综合钢坯加热过程中的氧化烧损及燃料消耗两个因素,对加热炉进行了温度预示计算、最优化空气系数及最优化炉温计算,得出了加热炉加热不同规格钢坯时的经济区域. 相似文献
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本文介绍了高温远红外涂料在攀钢轨梁厂加热炉上进行的生产应用试验情况,经生产数据统计与热工测定的结果证明,该涂料具有良好的热工性能,在生产中取得了减少轧钢钢坯待热时间、降低燃料消耗、减少砌体烧损剥落、降低钢坯氧化烧损等效果,获得明显的经济效益。 相似文献
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通过对新钢公司中厚板厂加热炉现状、钢坯加热要求及加热炉能源消耗等因素的分析,以及长期的热工工艺及加热制度的探索,对加热小炉采取有效的改进措施,提高了钢坯加热质量,增强了节能降耗效果,满足了生产线的加热需要。 相似文献
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奥氏体耐热不锈钢309S高温抗氧化性能研究 总被引:1,自引:0,他引:1
采用不连续称重法测得了奥氏体耐热不锈钢309S在不同温度下的高温氧化动力学曲线,结果表明309S钢高温氧化动力学曲线遵循抛物线规律.利用扫描电镜、X射线衍射和XPS的方法对氧化膜表面的形貌及化学元素沿氧化膜纵深方向的分布情况进行了研究,发现各温度下的氧化膜均均匀覆盖于基体表面;500℃下氧化膜氧化产物表层主要为Cr2O3和Fe2O3,内层主要为Cr2O3和NiO;1 000℃下氧化膜表层主要成分为Cr2O3、NiO、Fe3O4或Fe2O3,氧化膜内层基本不含NiO,主要为Cr2O3、Fe3O4或Fe2O3. 相似文献
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制备了80级帘线钢盘条在900℃空气等温5、8、12和16min以及900℃等温后分别以4、12和(4+12)℃/s的冷速冷却形成的氧化铁皮。用激光拉曼光谱仪确定了氧化铁皮是由FeO层、Fe3O4层和极少量的Fe2O3层组成。用金相显微镜观测了氧化铁皮的形貌、各层厚度和钢基体的显微组织。结果表明:由于氧化铁皮中产生了CO和CO2气体,900℃空气等温形成的氧化铁皮,除5min的样品外,都出现不同程度的裂缝或孔洞;随等温时间的延长,FeO中不断析出先共析Fe3O4,FeO层的急剧增加导致氧化铁皮总厚度增加。随冷速的提高,FeO层及氧化皮总厚度减少,钢基体中索氏体含量增多。以12℃/s冷却形成的氧化铁皮和基体组织,既有利于机械剥壳,又有利于盘条冷拉拔。 相似文献
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An oxide scale formed at 900 ℃ for 60 s in dry air was subjected to the simulated coiling processed with different coiling temperatures. The phase transformation behavior, especially the orientation distribution of the oxide scale, was analyzed using electron backseattered diffraction (EBSD) technique. When cooling from the coiling tem- perature of 650 ℃, the scale consists of FeaO4 layer, FeO layer and FeaO4 seam. The FeaO4 precipitates are ob served in the FeO grains of the scale formed with the coiling temperature of 550 and 450 ℃. With the cofling temperature of 350 ℃, the decomposition of FeO is suppressed due to the low temperature. The Fe3O4 grains, which are decomposed from FeO, has the same orientation as the parent FeO grains. Moreover, the FeO grains, of which the growth direction is parallel to 〈001〉, is easier to decompose into Fe3O4 than the grains with other orientations. 相似文献
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Oxide Scale Growth on High Carbon Steel at High Temperatures 总被引:1,自引:0,他引:1
The structure and formation process of oxidation on high carbon steel were investigated with the aid of X-ray diffraction (XRD), scanning electron microscope (SEM) and Laser Raman spectroscopy (LRS). The oxide scale formed comprised a three-layer structure, similar to that formed on pure iron and low-carbon steel. For the high carbon steel, however, the scale was essentially a two-layered because of the low proportion of hematite (Fe2O3) formed. The scale thickness increased with the temperature and time of oxidation. The rate of scale thickening rapidly increased above 900 ℃, at which the rate was particularly fast in the first 20 s of oxidation. The proportion of wüstite (Fe1-yO) increased with time and temperature of oxidation, while the magnetite (Fe3O4) remained constant at about 2 μm. 相似文献
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《钢铁研究学报(英文版)》2016,(3):231-237
In order to figure out the oxidation behavior of steels during heating,five micro-alloyed steels were subjected to continuous and isothermal oxidation using the thermo gravimetric analyzer and the Gleeble-3500thermo-mechanical simulator.The microstructure of oxide scales,especially the thickness fractions of Fe2O3,Fe3O4 and FeO layers,was analyzed using the scanning electron microscope(SEM),electron probe microanalyzer(EPMA)and electron backscattered diffraction(EBSD)techniques.The micro-alloyed steels containing alloying elements(Si,Cr,Ni and Cu)show a higher oxidation resistance compared with the low carbon steel.It is found that alloying elements accumulated at scale/substrate interface during high temperature oxidation.Alloying elements function in two ways in the oxidation of steels:one is enhancing the scale/substrate interface and consequently suppressing the blister of scales;and the other is impeding the outward diffusion of iron cations from substrate to scales,resulting in the decrease of oxidation rate.As the diffusion of iron cations is impeded,the thickness fractions of Fe2O3 and Fe3O4of micro-alloyed steels are more than those of low carbon steels. 相似文献
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以九水硝酸铁(Fe(NO3)3·9H2O)为铁源,无水乙醇和乙二胺为表面活性剂,采用水热法制备了纳米氧化铁(Fe2O3纳米棒),通过扫描电子显微镜观察分析了Fe2O3纳米棒形貌,研究了(Fe(NO3)3·9H2O)质量分数及反应温度对Fe2O3纳米棒颗粒尺寸的影响。结果表明,纳米棒的长度和宽度分别约为500~600 nm和50~60 nm;在160~220 ℃范围内,温度对Fe2O3纳米棒形貌的影响不显著;在一定范围内提高铁源质量分数可使纳米棒颗粒尺寸变小。Fe2O3纳米棒的形成机理为:铁源在强碱性的溶液中反应生成棕黄色絮状沉淀α-FeOOH,该沉淀在高温高压的环境中,在乙二胺作用下脱水形成Fe2O3纳米棒。 相似文献
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分析了轧钢连续加热炉在钢铁企业中能耗现状,提出降低轧钢加热炉能耗的一系列措施,包括改造加热炉结构、优化工艺、改进维护手段等。 相似文献