热轧无缝钢管在线热处理工艺组织性能调控研发技术进展

Development of Technology for Microstructure Control during On-line Heat Treatment Process for Hot-rolled Seamless Steel Pipe

传统无缝钢管热轧生产过程中,轧后采用空冷方式冷却至室温,缺乏有效的在线组织调控手段,需依赖添加较多的合金元素或后续热处理工序控制性能。介绍当前开发成功的热轧无缝钢管控制冷却技术开发应用进展,以及在改善和调控组织形态、组织细化、冷却路径控制等方面的应用情况。同时,针对目前热轧无缝钢管生产过程中的组织调控,提出在铸坯质量提升、细晶均质化等领域将是进一步开展相关研究的重点。以控制冷却技术为核心,优化成分设计,综合运用强化机制,将有望形成基于全流程组织性能调控的全新生产工艺技术体系,可更加充分挖掘材料潜力,最终实现热轧钢管产品质量的全面提升及减量化制造。

In the conventional manufacturing process for the hot-rolled seamless steel pipe, the pipe as rolled was air-cooled down to the ambient temperature. And due to absence of proper on-line microstructure control of the pipe, properties had to be controlled depending on addition of much more alloy elements, and the subsequent heat treatment process. Described here in the paper were the progresses of development and application of the controlled- cooling technique for the hot-rolled seamless steel pipe, and the applications of improvement and control of histomorphology, microstructure refining and cooling route control. As for the currently-used microstructure control during the manufacturing process of hot-rolled seamless steel pipe, emphases of further research were proposed, focusing on the improvement of cast billet quality and fine grain homogenization. The new technological system of microstructure control for the whole manufacturing process was expected to be set up by means of taking the controlled- cooling technique as the key, optimizing chemical composition, and comprehensively using the strengthening mechanism. Then the potential of the materials can be further tapped, and finally the overall improvement of product quality and reduction manufacture for the hot-rolled seamless steel pipe can be achieved.