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发明公开
CN106636888A 一种低碳当量高强度X70管线钢热轧卷板及其制造方法 无效 - 驳回

一种低碳当量高强度X70管线钢热轧卷板及其制造方法
摘要：
本发明公开了一种低碳当量高强度X70管线钢热轧卷板及其制造方法，属于管线钢技术领域。所述卷板按照质量百分比包括以下组分：C：0.04～0.08％，Si：0.1～0.3％，Mn：1.4～1.6％，Nb≤0.06％，Ti≤0.02％，Mo：0.1～0.2％，Ceq≤0.38，其他为Fe和不可避免的微量杂质；所述卷板的内部显微组织为粒状贝氏体和铁素体。制造方法包括冶炼、连铸、二次加热、粗轧、精轧、冷却、卷取。本发明通过优化合金成分设计，同时通过控制加热、轧制、冷却工艺配合，良好的抵抗了制管过程中较大的包辛格效应，获得具有良好综合力学性能的适用于薄规格X70管线钢的热轧卷板，屈服强度545MPa以上。
摘要（英）：

The invention discloses a low-carbon equivalent and high-strength X70 pipeline steel hot-rolled plate and a manufacturing method thereof, and belongs to the technical field of pipeline steel. The coiled plate comprises the following components in percentage by mass: 0.04-0.08% of C, 0.1-0.3% of Si, 1.4-1.6% of Mn, Nb not more than 0.06%, Ti not more than 0.02%, 0.1-0.2% of Mo, Ceq not more than 0.38, and the balance of Fe and inevitable trace impurities; and internal microscopic structures of the coiled plate are granular bainite and ferrite. The manufacturing method comprises smelting, continuous casting, secondary heating, rough rolling, finish rolling, cooling and coiling. Through optimization of the alloy component design, and through control of the heating, rolling and cooling process cooperation, the higher Bauschinger effect in the pipe manufacturing process is excellently resisted; the hot-rolled plate with excellent comprehensive mechanical performance and suitable for thin-specification X70 pipeline steel is obtained; and the yield strength is above 545 MPa.

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