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发明公开
CN108103407A 屈服450MPa级酸性环境服役管线钢板及其生产方法 无效 - 撤回

屈服450MPa级酸性环境服役管线钢板及其生产方法
摘要：
本发明公开了一种屈服450MPa级酸性环境服役管线钢板及其生产方法，钢板化学成分组成及质量百分含量为：C：0.03～0.06%，Si：0.20～0.40%，Mn：1.00～1.20%，P≤0.010%，S≤0.002%，Nb：0.04～0.06%，Ni：0.15～0.30%，Cr：0.15～0.25%，Cu：0.18～0.30%，Alt：0.02～0.04%，余量为Fe和不可避免的杂质；生产方法包括冶炼、连铸、加热、轧制、冷却工序。本发明采用控轧控冷工艺得到铁素体、贝氏体的复合组织，屈服强度450～500MPa，抗拉强度550～600MPa，屈强比≤0.90，‑40℃冲击功均值≥150J。
摘要（英）：

The invention discloses an acidic environment service pipeline steel plate with the yield strength of 450MPa and a production method thereof. The steel plate comprises the following chemical components, by mass percentage: 0.03-0.06% of C, 0.20-0.40% of Si, 1.00-1.20% of Mn, less than or equal to 0.010% of P, less than or equal to 0.002% of S, 0.04-0.06% of Nb, 0.15-0.30% of Ni, 0.15-0.25% of Cr,0.18-0.30% of Cu, 0.02-0.04% of Al, and the balance Fe and inevitable impurities. The production method comprises the steps of smelting, continuous casting, heating, rolling and cooling. According tothe steel plate and the production method thereof, a controlled rolling and controlled cooling process is adopted to obtain a composite tissue of ferrite and bainite, the yield strength is 450-500MPa,the tensile strength is 550-600MPa, the yield ratio is less than or equal to 0.90, and the mean value of ballistic work at -40 DEG C is greater than or equal to 150J.

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