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发明授权
CN101864542B 高频电阻直缝焊油井管用钢及其制造方法 有权

高频电阻直缝焊油井管用钢及其制造方法
摘要：
本发明涉及高强度油井管用钢及其制造方法，特别涉及高频电阻直缝焊油井管用钢及其制造方法，解决现有技术ERW石油油井管用钢强度和韧性偏低，屈强比较高，且强度和塑性不能良好匹配，不能满足N80级别非调质ERW焊接非调质油井管用钢的技术问题。本发明设计了一种高频电阻直缝焊油井管用钢，其特征在于化学成分(重量百分数)为，C：0.05～0.13％，Si：0.10～0.40％，Mn：1.0～1.8％，Cr：0.1～0.5％，Mo：0.1～0.5％，Nb：0.02～0.06％，Ti：0.02～0.06％，P≤0.025％，S≤0.020％，余量为Fe和不可避免的夹杂元素。可用于制作石油套管和油管。
摘要（英）：

The present invention relates to a steel for a high-strength oil well pipe and a production method thereof, in particular to a steel for a high-frequency resistance straight weld oil well pipe and a production method thereof, solving the technical problems that the steel for an ERW (Electrical Resistance Weld) oil well pipe in the prior art cannot meet the steel for N80 grade non-quenched ERW welding non-quenched oil well pipes due to extremely-low strength and toughness, higher yield, no favorable matching of the strength and the plasticity. The present invention designs the steel for the high-frequency resistance straight weld oil well pipe. The steel is characterized by comprising the following chemical components in percentage by weight: 0.05-0.13 percent of C, 0.10-0.40 percent of Si, 1.0-1.8 percent of Mn, 0.1-0.5 percent of Cr, 0.1-0.5 percent of Mo, 0.02-0.06 percent of Nb, 0.02-0.06 percent of Ti, not more than 0.025 percent of P, not more than 0.020 percent of S and the balance of Fe and inevitable doped elements. The invention can be used for producing oil casings and oil pipes.

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