显微组织对薄壁X65M管线钢落锤试验性能的影响
Influence of Microstructure on DWTT Performance of Thin-wall X65M Pipeline Steel
张明1
作者信息
- 1. 江阴兴澄特种钢铁有限公司特钢研究院,江阴 214429
- 折叠
摘要
对厚度为6～9.5 mm的薄壁管线钢低温落锤性能容易出现波动的问题,通过轧制对比实验分析,探究了薄规格X65M管线钢低温落锤性能的控制工艺的影响因素.通过不同低温落锤试验结果样品的显微组织分析和数值化结构研究,发现钢中多边形铁素体晶粒尺寸大小和钢板心部片条状分布的M/A组织对低温落锤性能影响显著.当钢中面积在200 μm2以上的晶粒数量较多,平均面积超过260 μm2,或者M/A组织占比＞6％时,钢板低温落锤性能明显恶化.通过连铸过热度控制以及控轧控冷工艺优化,有效细化了晶粒尺寸并减少了M/A组织的形成,实现6～9.5mm薄壁钢板批量稳定生产8万t以上,可以满足-30 ℃低温落锤要求,对薄规格管线钢产品的研发和生产具有重要意义.
Abstract
The paper addresses the issue of fluctuating low-temperature drop-weight tear test(DWTT)performance in 6-8 mm thin-wall pipeline steel,the influencing factors of the control process of low-temperature DWTT of X65 thin-wall pipeline steel have been explored.With microstructure analysis and numerical deconstruction study of different low-temperature DWTT results,,it reveal that the size of polygonal ferrite grains and the distribution of M/A constituents in the central part of the steel plate significantly affect low-temperature DWTT performance.When the average area of grains with an area ≥200 μm2 is greater than 260 μm2,and the proportion of M/A constituents is greater than 6％,DWTT perfor-mance shall deteriorate significantly.By optimizing the composition and continuous casting and rolling processes,control of grain size and M/A constituents can effectively improve the low-temperature DWTT performance of thin-specification pipeline steel.The related product has achieved stable production of more than 80,000 tons,meeting the requirement of -30 ℃ low-temperature DWTT,it is of great significance for the development and production of thin-wall pipeline steel products.
关键词
薄壁管线钢/落锤/晶粒尺寸/M/A组织/X65MKey words
Thin-wall Pipe Line Steel/DWTT/Grain Size/M/A Microstructure/X65M引用本文复制引用
出版年
2024
NETL
NSTL
万方数据