Continuous casting mould powder evaluation

Abstract

A continuous casting mould powder must satisfy various requirements including thermal insulation, chemical insulation, inclusion absorption, lubrication, and promotion of uniform heat transfer from the solidifying steel strand to the copper mould. The relative importance of these properties varies according to the type of steel cast, the prevailing casting conditions, and the end steel requirements. Development of mould powders at Corus UK Ltd involves plant based trials of different powders whose properties influence the above characteristics of which heat transfer is a major consideration. Particular use is made of mould thermal monitoring which, although primarily designed for sticker breakout detection, is now finding increasing use as an investigative tool in mould slag assessment. Both static and dynamic plant data are now available relating mould slag heat transfer performance to casting conditions and this paper describes some recent investigative work carried out by the Aluminium & Steel Casting Department of Teesside Technology Centre, Corus UK Ltd. The study shows that using a combination of plant based observation and laboratory analysis, a greater depth in understanding of mould powder performance can be realised, yielding important information for future powder development.     

Continuous casting of steel at micro mills

The continuous casting of steel at micro mills is analyzed. Recommendations are made with a view to increasing the casting efficiency at low-speed single-strand machines: improvement in metal quality; extension of casting runs; increase in refractory life; and reduction in costs.     

宝钢分公司连铸过程控制系统

对宝钢分公司已建成的7套连铸机的过程控制系统从系统架构、网络构成、应用功能、模型功能及特点等几方面进行了叙述,并对连铸过程控制技术的发展趋势进行了预测.     

Continuous renal replacement therapies: an update

Continuous renal replacement modalities have found widespread use and acceptance over the last decade. The various modalities differ in the kind of access (arteriovenous v venovenous); in the application of convective clearance (continuous hemofiltration), diffusive clearance (continuous hemodialysis), or a combination of both (continuous hemodiafiltration); and in the location where the replacement fluid enters the circuit (predilution v postdilution). Continuous therapies incorporate several advantages, such as improved hemodynamic stability, the possibility for unlimited alimentation, optimal fluid balance, and gradual urea removal without fluctuations. However, it has not yet been shown whether these advantages have a significant impact on outcome and prognosis, the ultimate measure of treatment efficiency. Major disadvantages of continuous therapies are the ongoing necessity for continuous anticoagulation, immobilization of the patient, and possible side effects from lactate-containing replacement fluid or dialysate. Continuous renal replacement procedures have certainly made the management of critically ill patients easier. In particular, oligoanuric patients with diuretic resistant volume overload and hemodynamically unstable patients with acute renal failure and concomitant sepsis or multiorgan failure appear to benefit most from continuous treatment. The role of continuous hemofiltration as a method of removing serum cytokines in septic patients without renal failure is still controversial and needs further clinical assessment. Due to slow efficacy, continuous renal replacement is indicated only in rare circumstances for intoxication; this therapy also is of rather limited use in severe hyperkalemia or acidosis. Noncritically ill patients with uncomplicated renal failure (eg, due to the use of dye or antibiotics) should be treated with intermittent hemodialysis or peritoneal dialysis. Furthermore, intermittent hemodialysis is preferable in patients with hemorrhagic diathesis because it can be easily performed without anticoagulants.     

Continuous casting of steel at metallurgical plants in Poland

Foreign Practice

Continuous casting of steel at metallurgical plants in Poland     

连铸机蒸汽溢出的解决方案及其优化方向

将1500℃以上的钢水浇铸成钢坯的过程中,连铸机有一段利用水直接对坯壳进行冷却的过程,形成质量成分稳定的铸坯。水直接对高温坯壳进行冷却时会产生冷却蒸汽,围绕连铸机蒸汽外溢提出了相应的解决方案和优化方向,在实际应用中取得了良好的效果。     

连铸单支定重切割系统的开发与应用

2008年以来,在全国钢铁产量几何似的暴涨前提下,产能过剩、价格不断下滑造成各大钢铁厂在经营成本上不断寻求突破,除了加强能源回收利用,降低原燃料消耗等措施外,各种前沿的新技术也不断为各钢厂所应用,定重切割工艺就是其中之一.本文介绍的定重切割系统改造是借鉴了相关先进经验,由西林钢铁公司自身自动化团队着手设计、实施的,经过一年多的使用统计,完全达到了预期效果.西林钢铁集团有限公司的技术人员对炼钢连铸机剪切系统进行了全面的系统改造,利用抗高温防水防腐蚀的称重传感器在连铸机各流制作静态钢坯秤,利用液压传动系统升降钢坯秤采集铸坯重量信息,通过PLC上下位机软件处理铸坯重量、长度信息与生产工艺参数间的逻辑、数学关系,同时进行统计记录,自主研发出一套西钢专有的钢坯定重剪切自动控制系统,在更好的完成生产的需要的同时,具有实现故障率低、钢坯定重合格率高、有效的保证轧钢成材率等优点.技术实施后,铸坯单重±5 kg的合格率稳定在80%以上,棒材工序成材率提高0.15%左右,取得了极大的经济效益和良好的社会效益.     

珠钢CSP连铸的生产实践

本文介绍珠钢CSP连铸投产一年多的生产实践,描述连铸主要设备及特点,对连铸工艺进行介绍及总结,特别是对于连铸开浇失败和漏钢,提出一些对策和措施。     

Continuous casting of steel at bar-casting machines in Ukraine and Moldova

Since the turn of the century, continuous bar-casting machines have been widely established, primarily at mini mills. The continuous bar-casting machines already in operation in Ukraine and Moldova are considered, along with the prospects for the construction of new mini mills and the expanded production of continuous-cast bar.