江阴兴澄特种钢铁有限公司特钢研究院,江阴 214429
张明(1973—),男,本科,工程师 E-mail : zhangming1971477@citicsteel.com
收稿:2023-10-05,
纸质出版:2024-09-30
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张明.显微组织对薄壁X65M管线钢落锤试验性能的影响[J].特殊钢,2024,45(05):123-126.
Zhang Ming.Influence of Microstructure on DWTT Performance of Thin-wall X65M Pipeline Steel[J].Special Steel,2024,45(05):123-126.
张明.显微组织对薄壁X65M管线钢落锤试验性能的影响[J].特殊钢,2024,45(05):123-126. DOI: 10.20057/j.1003-8620.2023-00205.
Zhang Ming.Influence of Microstructure on DWTT Performance of Thin-wall X65M Pipeline Steel[J].Special Steel,2024,45(05):123-126. DOI: 10.20057/j.1003-8620.2023-00205.
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 μm
2
以上的晶粒数量较多,平均面积超过260 μm
2
,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6~9.5 mm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。
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-te
mperature 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 μm
2
is greater than 260 μm
2
, and the proportion of M/A constituents is greater than 6%, DWTT performance 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.
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