终冷温度对高强度管线钢屈强比的影响  

Effects of finish rolling temperature on the yield strength/ultimate tensile strength ratio of high-strength pipeline steels

作　　者：闫立超[1] 余伟[1] 唐荻[1] 黄秋菊[2] 谢勇[1] 

机构地区：[1]北京科技大学国家高效轧制工程中心,北京100083 [2]鞍山钢铁集团新轧钢有限公司,辽宁鞍山114001

出　　处：《南方金属》2008年第2期8-10,共3页Southern Metals

摘　　要：通过控制终冷温度得到不同微观组织的管线钢,研究了显微组织对管线钢屈强比的影响,结果表明,板条状贝氏体型管线钢比针状铁素体型管线钢具有更低的屈强比,板条贝氏体型管线钢中细小弥散的析出对降低屈强比是有利的.The microstructure of pipeline steels can be controlled by controlling the finish rolling temperature, and the effects of so obtained microstructure on the yield strength/ultimate tensile strength ratio of high-strength pipeline steel are investigated in the paper. It was found that the high-strength pipeline steel with lath-shaped bainite microstructure had lower yield strength/ultimate tensile strength ratio than that with acicular ferrite microstructure. The fine and dispersive precipitates in the pipeline steel with lath-shaped bainite microstructure was beneficial to reducing the ratio.

关 键 词：高强度管线钢 显微组织 屈强比 位错 针状铁素体 

分 类 号：TG115[金属学及工艺—物理冶金]