Characterization of Inclusions and Countermeasures to Reduce Nozzle Clogging
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.
inclusion characterization nozzle clogging clean steel practice
Hwan-Tang Thomas Tsai
Hunan Valin Steel Company, 111 Furongzhonglu II, Changsha, Hunan, China
国际会议
The 2nd International Symposium on Clean Steel(第二届洁净钢生产技术学术研讨会)
沈阳
英文
310-319
2011-08-23（万方平台首次上网日期，不代表论文的发表时间）