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发明公开
CN106636943A 延伸率A50．8≥48%的薄规格高强管线钢及其生产方法 失效 - 权利终止 转让

延伸率A<sub>50．8</sub>≥48%的薄规格高强管线钢及其生产方法
摘要：
本发明公开了一种延伸率A50.8≥48％的薄规格高强管线钢及其生产方法，该管线钢由以下重量百分比的化学元素构成：C：0.07％～0.12％，Si：0.15％～0.30％，Mn：1.45％～1.75％，Cr：0.1％～0.35％，Nb：0.025％～0.055％，V：0.015％～0.045％，Ti：0.010％～0.025％，Mo：0.08％～0.15％，N：≤0.006％，P：≤0.015％，S：≤0.002％，其余为Fe及不可避免的杂质。该管线钢的生产方法包括如下步骤：1)冶炼并浇铸成坯；2)缓冷后装炉再加热；3)进行粗轧；4)进行精轧；5)进行冷却；6)矫直上冷床冷却至室温；7)进行回火热处理。所生产的薄规格高强管线钢的延伸率提高至A50.8≥48％，力学性能完全满足俄罗斯等高寒地区对于高延伸率和低温韧性的需求。
摘要（英）：

The invention discloses thin-specification high-strength pipeline steel with ductility A 50.8 of not less than 48% and a production method thereof. The pipeline steel consists of the following chemical elements in percentage by weight: 0.07-0.12% of C, 0.15-0.30% of Si, 1.45-1.75% of Mn, 0.1-0.35% of Cr, 0.025-0.055% of Nb, 0.015-0.045% of V, 0.010-0.025% of Ti, 0.08-0.15% of Mo, N not more than 0.006%, P not more than 0.015%, S not more than 0.002%, and the balance of Fe and inevitable impurities. The production method of the pipeline steel comprises the steps of: 1) smelting and blank pouring; 2) furnace charging after slow cooling and reheating; 3) rough rolling; 4) finish rolling; 5) cooling; 6) straightening and cooling to the room temperature by an upper cooling machine; and 7) tempering heat treatment. The ductility of the produced thin-specification high-strength pipeline steel is increased to A50.8 not less than 48%; and the mechanical performance totally satisfies the demands on high ductility and low-temperature toughness in such alpine regions as Russia.

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