采用水模拟进行浸入式水口到结晶器的钢水流分析

采用水模拟和计算机模拟的流动分析,研究了浸入式水口流出孔及内面底部形状对钢水流的影响,并对两种方法的分析结果进行了比较。

Laser-assisted water jet machining of high quality micro-trap structures on stainless steel surfaces

Secondary electron emission(SEE)has emerged as a critical issue in next-generation accelerators.Mitigating SEE on metal surfaces is crucial for enhancing the stability and emittance of particle accelerators while extending their lifespan.This paper explores the application of laser-assisted water jet technology in constructing high-quality micro-trap structures on 316L stainless steel,a key material in accelerator manufacturing.The study systematically analyzes the impact of various parameters such as laser repetition frequency,pulse duration,average power,water jet pressure,repeat times,nozzle offset,focal position,offset distance between grooves,and processing speed on the surface morphology of stainless steel.The findings reveal that micro-groove depth increases with higher laser power but decreases with increasing water jet pressure and processing speed.Interestingly,repeat times have minimal effect on depth.On the other hand,micro-groove width increases with higher laser power and repeat times but decreases with processing speed.By optimizing these parameters,the researchers achieved high-quality pound sign-shaped trap structure with consistent dimensions.We tested the secondary electron emission coefficient of the"well"structure.The coefficient is reduced by 0.5 at most compared to before processing,effectively suppressing secondary electron emission.These results offer indispensable insights for the fabrication of micro-trap structures on material surfaces.Laser-assisted water jet technology demonstrates considerable potential in mitigating SEE on metal surfaces.

通过Ca处理防止连铸机结晶器水口堵塞

韩国浦项钢铁公司光阳小钢厂的连铸机,因受使用结晶器厚度的制约,水口内钢水流道的断面部很小,只为12.5mm。因此,水口内壁产生少量的附着物,将导致正常浇铸所需的钢水不能供给结晶器,水口堵塞将中断浇铸作业。光阳厂连铸机水口堵塞时对内壁附着物的状态及防止水口堵塞的钢水处理条件进行了研究。

Material flow control technology of ironmaking and steelmaking interface

In order to achieve higher efficient cohesion match of procedure and equipment between ironmaking and steelmaking interface, the theory of multi-dimensional material flow control was applied to analyze torpedo ladle-iron ladle transportation process between blast furnace and basic oxygen furnace. Moreover, basic parameters of material flow were analyzed and optimized, such as time, temperature and material quantity. Based on operating principles of material flow, control methods were optimized, such as product organization mode, scheduling discipline and scheduling plan of hot metal ladle. Finally, the material flow control technology of ironmaking and steelmaking interface was integrated. Satisfactory effects are obtained after applying the technology in practice. The total turnover number of torpedo ladle decreases from 20 to 18, the hot metal temperature of 1# BF torpedo ladle decreases from 36 °C to 19.5 °C, the hot metal temperature of 2# BF torpedo ladle decreases from 36.6 °C to 19.8 °C, the temperature drop of desulfurization hot metal decreases by 4 °C, and the temperature drop of non-desulfurization hot metal decreases by 2.8 °C. Furthermore, the ironmaking and steelmaking interface system will realize high-efficiency control by using this control technology.

The Characterization of Damage of the Pipes Made from Stainless Steel

The damage was noted during the usage of the pipe system which was made out of austenite steel 316L on the assembly line for the production of urea. In order to find out the cause of such damage, the samples of pipes were taken at the places where the most damage took place. Samples were taken in the form of film, sediment and/or sludge from inner and the outer surface of the pipes. As well as each pieces of pipes were further cut into 10 mm x 10 mm plates. The prepared samples were studied using X-ray diffraction, X-ray emission spectrometry, scanning electron microscope and microanalysis as well as a light microscope. The results implicate microstructural changes within the inner wall of the pipe which was caused by intercrystalline corrosion. Such corrosion in the investigated samples of sediment and/or sludge appeared due to the damage of the protective film during the aggressive phases,

六流T形中间罐内腔优化的水模研究

为了解决6流T形中间罐各水口钢水分配不均、温差大等问题,我们就马钢6流方坯连铸机的T形中间罐作了优化其内腔的水模研究,在中间罐内增设了适当的纵向或横向挡墙进行了试验。试验证明,适当地设置这种挡墙能起到对各水口均匀分配钢水、减小水口间钢水温差的作用。横向挡墙已在生产中应用,效果很好。

用旋转阀控制中间罐流量

当前中间罐钢水流量是通过塞棒和计量水口或滑动水口来控制的。对于自动开流和浇铸的精确控制来说,滑动水口优于相对粗糙的塞棒系统。滑动水口的不足之处在于钢水易凝固在密封处,影响正确操作。为避免上述问题,瑞士Stopinc公司开发出一种旋转管式阀门。

YB/T063《面压式滑动水口》解读

本文从适用范围、技术要求、试验方法、检验规则等多方面对新版标准与旧版标准YB/T063《面压式滑动水口》进行比对和分析。主要对新版标准修订后的主要变化内容进行介绍,重点对修订前后变化较大的“分类、型号、基本参数和技术要求”等内容开展解读,为相关企业的研发、制造、检测人员提供参考,促进相关从业者更系统、全面、准确地理解和应用新版标准,对标准执行具有指导意义。

达涅利新型薄板坯连铸机

达涅利公司所开发的薄板坯连铸机可浇铸50～80×800～2300mm板坯。这种铸机采用8项特殊技术,其中最引人注目的是浸入式水口的设计、结晶器的设计和带液芯长度动态控制的液芯压下(也称软压下)。 1)浸入式水口。达涅利公司通过优化浸入式水口的几何形状和操作参数(如浸入深度),使钢水流向最佳且不冲刷凝固壳而湍流最小。