China's Refractories

《中国耐火材料》英文版

China's Refractories ›› 2021, Vol. 30 ›› Issue (1): 31-34.DOI: 10.19691/j.cnki.1004-4493.2021.01.005

• Original article • Previous Articles     Next Articles

Design of Composite Ladle Shroud for Improving Thermal Shock Resistance

LIU Guoqi*(), LI Hongxia, YANG Wengang, QIAN Fan, YU Jianbin, MA Weikui   

  1. State Key Laboratory of Advanced Refractories, Luoyang Institute of Refractories Research Co., Ltd., Luoyang 471039, China
  • Online:2021-03-15 Published:2021-05-01
  • Contact: LIU Guoqi
  • About author:Liu Guoqi, born in 1975, received his doctor’s degree in material science from University of Science and Technology Beijing in 2006. He is mainly engaged in functional refractories for basic and applied research. He won a second prize for State Technological Invention Award (ranking 3rd) and a first prize of Henan Science and Technology Progress Award (ranking 2nd). He has published more than 70 articles in domestic and foreign scientific journals, among which more than 20 papers have been indexed by EI or SCI. He has applied for more than 30 patents and obtained 20 authorized invention patents.

Abstract:

A ladle shroud is one of the functional refractories for continuous casting, which undergoes severe thermal shock by molten steel when used without pre-heating. The composite ladle shroud with an insulating liner presents excellent thermal shock resistance. Finite element simulation is an effective method to explore the maximum thermal stress for predicting the thermal shock resistance of ladle shrouds. In this paper, the influence of the lining materials and the structure of ladle shrouds on the thermal stress distribution is systematically researched. The working mechanism of the lining material on the body material is also presented. Lining materials with low thermal expansion, elastic modulus and thermal conductivity are helpful to improve the thermal shock resistance and an optimum lining thickness is suggested. The lining material can both serve as thermal resistance for the body material to buffer the thermal stress, and apply a strain load to the body material by the thermal strain to increase the stress.

Key words: composite ladle shroud, thermal shock resistance, finite element simulation, thermal stress