摘要
通过对不同终轧、终冷温度条件下X65/X70中厚板管线钢的板屈强比值和微观组织的变化研究发现,当终轧温度低于Ar3温度时,钢板进入两相区轧制,钢板组织呈带状分布,钢板屈服强度的提高幅度大于抗拉强度的提高,屈强比呈上升趋势.水冷中钢板头部温度过冷对屈强比控制也非常不利.通过对X65/X70管线钢进行控轧控冷工艺优化,屈强比值得到显著降低,大幅提高了管线钢板合格率和成材率.
By investigating the change in yield ratio and microstructure of X65/X70 pipeline plates at different finish rolling temperatures and final cooling temperatures,it is found that the microstructure has band structure and the amplitude of high yield ratio is greater than that of tensile strength when the finish rolling temperature is below the Ar3 temperature and the plate is rolled in the two-phase zone.Overcooling at the head of the plate is not beneficial to low yield ratio.By optimizing the processing parameters,the yield ratio of X65/X70 pipeline steel reduces obviously and the qualified rate of products increases greatly.
出处
《北京科技大学学报》
EI
CAS
CSCD
北大核心
2010年第4期450-454,460,共6页
Journal of University of Science and Technology Beijing
关键词
管线钢
屈强比
轧制温度
冷轧温度
带状组织
pipeline steel
yield ratio
finish rolling temperature
final cooling temperature
band structure
