连铸机转盘装置的改进

热轧一厂全连轧入炉钢坯中间运送环节时间较长,钢坯从连铸机拉出后热能损失过大,经过转盘装置改进,提高了钢坯热装温度,降低了能耗,加快了生产节奏。     

热送热装工艺的研究

热送热装是一种节能降耗工艺,对传统工业结构的改革具有深远的意义。但在实际生产中,该工艺会使钢坯/钢锭产生红送裂纹。铸坯/钢锭在凝固后的冷却过程中,会发生C、N化合物析出于奥氏体晶界,削弱晶界能,导致A→F相变,体积膨胀加剧了晶界强度的减弱,在轧制时就会扩展形成表面裂纹。因此,需要制定合理的热送工艺和加热工艺,以保证热送热装工艺的顺利实施。     

COREX预还原竖炉矿焦混合布料规律

 针对宝钢的COREX-3000预还原竖炉炉顶的万向节布料器矿焦混合布料过程进行了试验研究。基于量纲和谐原理推导了相似准数,并按照1∶5比例建立冷态模型装置,定量考察了物料混合比例对料流宽度、料面形状以及径向料堆结构的影响。研究表明：物料混合比例对料流宽度和料面形状的影响较小,对料堆结构影响显著,随着大颗粒质量分数的增加,料堆堆密度降低,料堆空隙率增大。研究结果对于指导COREX竖炉生产过程的布料规律具有参考价值。     

提高宽厚板坯无清理率的关键技术

重钢新区在投产之初,连铸板坯表面原始合格率较低,铸坯表面的主要缺陷表现为:表面纵裂纹、铸坯角部 横裂纹、铸坯宽面边部凹陷,此外黏结问题一方面对工艺顺行造成了重要影响,同时也制约了铸坯表面质量的提 高。通过对现场生产过程中铸坯表面缺陷的跟踪和分析,并在生产中采取相应的控制措施,最终使铸坯表面无清 理率达到了较高水平,为连铸坯的热送热装创造了条件。     

The Influence of Hot Charging Conditions on Microstructure and Precipitation of High Strength Nb–Ti Complex Microalloyed Steels

A comprehensive microstructure analyses were conducted for hot charging processed Nb, Ti microalloyed steel, especially focusing on the evolution of microstructure and precipitation behavior. Hot charging process was simulated in the laboratory in the current research. Precipitation and microstructure in Ti–Nb microalloyed HSLA steels were investigated in different hot charging temperature conditions using transmission electron microscope (TEM), optical microscopy, analytical transmission electron microscopy, and energy dispersive spectroscopy (EDS). The results showed that the microstructure consists of fine and homogeneous lath bainite at 1000°C, lath bainite and granular bainite at 900°C. As the hot charging temperature decreased, there appeared a small fraction of proeutectoid ferrite along grain boundary at 800°C. The grain sizes in hot charging are coarse compared with that of 700°C due to the phase transformation didn't occur. The chemical composition of complex carbonitrides changes from Ti rich to Ti–Nb uniform with decreasing temperature.     

降低烧结矿碱度 提高烧结矿入炉比

经过工业性试验研究表明,结合太钢铁系统的生产现状,在太钢现有烧结原料条件下,降低烧结碱度到1.5能够满足太钢高炉工艺的要求,烧结矿的产、质量得了保证,高炉炉况基本能够稳定顺行,高炉经济技术指标改善,烧结能力充分发挥,取得了较大的经济效益。     

铝电解“一高四低”工艺技术研究

在采用点式下料、Al2O3浓度控制技术的基础上,对槽电压、分子比、电解温度、AE系数等工艺技术条件进行综合研究,提出铝电解“一高四低”工艺技术,并与传统的工艺进行了对比,结果表明该技术可大幅度提高电流效率,降低电耗。     

攀钢连铸板坯热送热装及相关工艺研究

针对攀钢连铸板坯热送热装生产现状，开发了板坯热送，加热过程数学模型，进行了铸坯生产组织方式及表面质量状况轧制前后对应关系的工业试验，在此基础上，建立了铸坯热送热装管理办法和加热炉操作规程。生产统计表明，铸坯热送热装率从１９９５年的１６．７％提高到１９９６年的３６．９％平均入炉温度达５６５℃。     

借助边缘环布碎焦和中心加焦控制高炉内气流分布

分析了高炉边缘环布碎焦和中心加焦对气流分布的控制作用。中心加焦可促进中心气流发展，减轻煤气对炉墙的冲刷；环布碎焦可有效隔热且避免矿石结炉墙。此两项措施并用可使高炉内气流分布合理，侵蚀减缓，结果消除、热损失减少，有利于节能。     

Effect of hydrogen charging on the torsional fatigue behaviour of 2024 aluminium

Torsional fatigue tests have been carried out on overaged and hydrogen charged specimens of 2024 aluminium in gaseous hydrogen and humid air. Hydrogen charging was found to significantly increase the number of fatigue crack initiation sites compared with uncharged specimens tested in argon, resulting in an overall reduction in fatigue life. Fatigue testing in gaseous hydrogen and humid air influenced both initiation and propagation of cracks. The fracture sites of both charged and uncharged specimens were similar, and the fracture mode was predominantly tensile in all specimens. However, specimens tested in humid air showed small amounts of longitudinal and transverse fracture, with ≈5% shear at low humidity and 10% at high humidity.