25MnV钢贝氏体转变行为研究

通过膨胀仪方法,研究了25MnV钢在模拟2种无缝钢管控轧控冷试验工艺条件下的贝氏体转变行为。结果表明,在终轧温度较高,轧后快速冷却到390～485℃再缓冷的情况下,可获得硬度大于22HRC的全贝氏体组织。采用控轧控冷工艺生产贝氏体组织N80钢级套管是可行的,此项研究成果为开发贝氏体非调质热处理钢管提供了依据。

Study on Bainitic Transformation Behavior of 25MnV Steel

The bainitic transformation behavior of the 25MnV steel is studied with the expansimeter method and under two experimental process conditions as simulating rolling and rolling-control ＆ cooling-control process conditions for seamless steel tube manufacture. The result shows that with higher rolling-end temperature, after getting the material quickly cooled down to 390-485 ~C, and then subjected to slow cooling, full bainitic structure with hardness higher than 22HRC is formed, which leads to such a conclusion that it is possible to produce the bainitic N80 steel oil casing with the rolling-control ＆ cooling-control process. The research achievement provides basis for development of the non-quenched-and-tempered bainitic steel tube.