wanhaorefractory

  Some of the problems that occur during the use of tundish refractory materials are the quality of the material itself, and some are related to the on-site construction and need to be carefully observed and analyzed. (1) Dry material has no strength Before the tundish is put into use, the dry material of the working layer needs to have a certain low temperature strength, which is mainly obtained by vibration and baking. After the dry material is demolded by vibration and baking, there will often be local lack of strength or low strength, which is very easy to cause collapse and affect the production of continuous casting cases. After long-term observation and analysis, the main reasons for the lack of strength or low strength of the dry material are: ① Baking problem:? The tundish baking device used in the steel plant is a gas baking device, which will cause a large number of pipelines to focus after long-term use. The tar or the burner is damaged, causing the...

Submerged entry nozzle was development in 1960s. At first time, it was produced from quartz. With the development of continuous casting, it can not meet the requirement of high level continuous casting and special steel casting.  With the improvement of the level of casting, especially special steel casting, quartz submerged entry nozzle can not meet requirement of casting life and steel quality. Therefore, aluminum carbon and aluminum carbon-zirconium carbon combined submerged entry nozzles came out. Compared to quartz submerged entry nozzle, this nozzle is of much longer service life. In order to adapt to low carbon steel casting, the inner layer of the nozzle uses special materials like aluminum magnesium, ceramics, etc. For casting aluminum killed steel, nozzle would easy to get block out of caking. Against this condition, both blowing argon in the way of ventilation and using non-carbon-containing and calcium zirconate material have achieved a good result....