采用热模拟试验,结合工业热轧过程,对厚度27.5mm高强度、高韧性X80管线钢板进行了研究,包括化学成分设计、板坯加热制度、控制轧制和控制冷却工艺。研究结果表明：采用超低碳设计,结合发挥显著作用的合金元素Mo和Cr等来弥补中厚板心部冷却不足,可以促进全壁厚匀质贝氏体相变组织形成;通过控制板坯加热温度,可以有效抑制原始奥氏体晶粒粗化;在控轧阶段,通过控制轧制压下量充分细化奥氏体晶粒尺寸;最终通过适当的加速冷却工艺,获得一个理想的微观组织结构。通过优化控制轧制工艺获得的微观组织保证了产品的低温韧性能力。
Combined with the industrial rolling process,the production technology for 27.5 mm X80 plates with high strength and high toughness was researched through hot simulation test,including chemical composition design,slab reheating,controlled rolling and cooling process.The results show that the weakness of cooling ability in centre of plate can be made up through using ultra-low carbon design and alloy elements Mo and Cr,as will promote the whole wall thickness bainite microstructure.Slab reheating temperature is controlled to inhibit austenite grain coarsening.By strengthening the rolling deformation,the austenite grain is refined and uniformed.Eventually an ideal microstructure is obtained through the proper cooling process.Therefore,the ultra-low carbon bainite microstructure through optimizing controlled rolling process can ensure low temperature toughness sufficient.
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