长寿命连铸辊的堆焊材料和工艺开发

介绍了大型板坯连铸机连铸辊的工况特点、主要失效形式,阐述了连铸辊堆焊材料的研究现状和性能要求.在1Cr13NiMo堆焊材料的基础上,增加了功能合金元素,开发出新的堆焊焊带和匹配的烧结焊剂,新堆焊熔敷金属的组织、强度和冷热疲劳性能明显优于进口焊材;研究了不同堆焊层间温度和焊后热处理温度对堆焊材料性能的影响规律.结果表明,合理的堆焊层间温度和焊后热处理温度能够获得最理想的组织和机械性能;新型连铸辊的使用寿命优于国外同类产品.

Development of Overlaying Welding Materials and Process for Long Service Life Continuous Casting Rolls

Introducing the process characteristics and failure types of continuous casting rolls for slab,the requirement for performance of continuous casting roll and current research on overlaying welding materials are described.A new overlaying welding rod for continuous casing rolls was then developed by adding some functional alloying elements into the 1Cr13NiMo series martensite corrosion-resistant steel as basic welding flux,as well as the sintered flux to match it.With the newly developed welding materials used,the structure,strength and thermal fatigue resistance of the weld zone are all better than those of imported rolls.How the different interlayer temperatures during overlaying welding and heat treatment temperature after welding affect the weld zone were both investigated,and the results showed that the most favorable structure and mechanical properties are available if both are chosen appropriately.The service life the continuous casting rolls thus welded is proved longer than imported ones.