Effect of finish rolling temperature and final cooling temperature on the yield ratio of X65/X70 pipeline plates
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摘要: 通過對不同終軋、終冷溫度條件下X65/X70中厚板管線鋼的板屈強比值和微觀組織的變化研究發現,當終軋溫度低于Ar3溫度時,鋼板進入兩相區軋制,鋼板組織呈帶狀分布,鋼板屈服強度的提高幅度大于抗拉強度的提高,屈強比呈上升趨勢.水冷中鋼板頭部溫度過冷對屈強比控制也非常不利.通過對X65/X70管線鋼進行控軋控冷工藝優化,屈強比值得到顯著降低,大幅提高了管線鋼板合格率和成材率.Abstract: 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.
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Key words:
- pipeline steel /
- yield ratio /
- finish rolling temperature /
- final cooling temperature /
- band structure
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