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首页> 外文会议>The 2nd International symposium on clean steel >Characterization of Inclusions and Countermeasures to Reduce Nozzle Clogging
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Characterization of Inclusions and Countermeasures to Reduce Nozzle Clogging

机译：夹杂物的表征和减少喷嘴堵塞的对策

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摘要

Total oxygen analysis, chemical or electrolytic extraction and optical microscope with image analyzer are common methods to measure the cleanliness of steel. A re-melting technique was developed to float out inclusions and be examined under SEM or Cathodoluminescence microscopy. Evaluation of inclusions by optical emission spectrometer, ultrasonic tests after hot rolling, slab milling and defect mapping as well as a computer-controlled SEM analysis are described. As a result, the source causes of defects may be identified and countermeasures developed. Tundish nozzle clogging is quantified by a nozzle clogging factor, which is monitored on-line. Inclusion characterization and the implementation of a clean steel practice have led to a reduction of nozzle clogging and an increased cast string length with improved steel quality.
机译：总氧气分析，化学或电解萃取以及带有图像分析仪的光学显微镜是测量钢清洁度的常用方法。开发了一种重熔技术以浮出夹杂物，并在SEM或阴极荧光显微镜下进行检查。描述了通过光发射光谱仪评估夹杂物，热轧后的超声测试，板坯铣削和缺陷映射以及计算机控制的SEM分析。结果，可以确定缺陷的根源并制定对策。中间包喷嘴堵塞通过喷嘴堵塞因子来量化，该因子可以在线监控。夹杂物的表征和清洁钢实践的实施已减少了喷嘴堵塞，并增加了铸弦长度，并改善了钢的质量。

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