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发明公开
CN105132822A 一种耐CO2腐蚀性能优异的管线钢及生产方法 有权 转让

一种耐CO2腐蚀性能优异的管线钢及生产方法
摘要：
一种耐CO2腐蚀性能优异的管线钢，其化学成分及wt%为：C：0.035～0.060％、Si：0.10~0.30％、Mn：1.00～1.50％、P：≤0.012％、S≤0.0020％、Cr：3.0～4.5％、Cu：0~0.10％、Ni：0~0.10％、Mo：0~0.10％、Nb：0.015～0.040％、Ti：0.010～0.025％、Al：0.010～0.050％、N：≤0.008％；生产步骤：连铸成坯后加热；粗轧；精轧；冷却；卷取；冷却至室温。本发明解决了现有技术抗CO2腐蚀性能、生产成本过高等不足，且钢板的Rt0.5≥450MPa， Rm≥535MPa，-20℃ KV2≥120J，-15℃ DWTT SA≥85％）；在温度80℃、CO2分压2MPa及流速为1.0m/s条件下，腐蚀速率≤5mm/a，较常规X65管线钢的腐蚀速率下降80%。
摘要（英）：

The invention provides pipeline steel excellent in CO2 corrosion resistance. The pipeline steel comprises, by weight, 0.035-0.060% of C, 0.10-0.30% of Si, 1.00-1.50% of Mn, 0.012% of P or less, 0.0020% of S or less, 3.0-4.5% of Cr, 0-0.10% of Cu, 0-0.10% of Ni, 0-0.10% of Mo, 0.015-0.040% of Nb, 0.010-0.025% of Ti, 0.010-0.050% of Al and 0.008% of N or less. A production method comprises the steps of heating after continuous casting and blank forming, rough rolling, precise rolling, cooling, reeling and cooling to indoor temperature. By means of the pipeline steel and the production method, the defects that in the prior art, the CO2 corrosion resistance is poor, and the production cost is excessively high are overcome; in addition, according to a steel plate, Rt0.5 is equal to or higher than 450 MPa, Rm is equal to or higher than 535 MPa, -20 DEG C KV2 is equal to or higher than 120 J, and -15 DEG C DWTT SA is equal to or higher than 85%; under the conditions that the temperature is 80 DEG C, the partial pressure of CO2 is equal to 2 MPa, and the flow velocity is equal to 1.0 m/s, the corrosion rate is smaller than or equal to 5 mm/a, and compared with conventional X65 pipeline steel, the corrosion rate is decreased by 80%.

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