Development of X70QPSL2 Tube for High Pressure Gas Transmitting Linepipe
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摘要: 通过合理设计化学成分，在冶炼上采用集成的冶炼控制技术、轧制上采用控制锻压比轧制及控冷工艺、热处理上采用外喷淋+内轴流工艺，成功开发出了壁厚S≥25 mm的高压输气用X70QPSL2无缝管线管，产品检测与评价表明：产品化学成分、纵向拉伸性能、夏比V型缺口冲击性能满足技术指标要求，屈服强度平均值559 MPa，抗拉强度平均649 MPa，屈强比平均0.85，伸长率平均25%，在0℃和-50℃条件下10 mm×10 mm×55 mm尺寸的V型横向冲击功分别达到213 J和180 J；50 MPa高压静水压试验评价合格；焊接性能优良。Abstract: The X70 QPSL2 seamless steel pipes with wall thickness S(>25 mm) for high pressure gas transmitting has been successfully developed by suitable alloyingdesign,integrated smelting control technology,controlled forging-compression ratio rolling and controlled cooling process,and external spray and internal axial flow process for heat treatment.The testing results and evaluation of the products show that the chemical composition,longitudinal tensile properties and Charpy V notch impact properties of the products meet the technical requirements.The average yield strength,tensile strength,yield ratio and elongation are 559 MPa,649 MPa,0.85,25% respectively.The transverse impact energy of the V type of 10 mm×10 mm×55 mm at 0℃ and-50℃are 213 J and 180 J respectively.Hydrostatic pressure test is qualified under 50 MPa high pressure.Welding performance evaluation indicates that the tube has excellent welding performance.
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Key words:
- seamless steel pipes /
- X70QPSL2 /
- high pressure /
- low temperature /
- thick wall /
- strength
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