管径1524 mm的X90螺旋埋弧焊管研发

采用高压力、大口径、高钢级管道进行长距离的天然气输送已成为管道工业的重要发展趋势。X90管线钢管的应用将提高管道输送量,减小钢管有效壁厚,降低管道建设成本。采用低C、高Mn+Nb]、高Mo+Cr]的合金化成分设计及纯净钢冶炼技术与控轧控冷技术,开发出以粒状贝氏体为主的壁厚20.3 mm的X90热轧卷板;通过焊接工艺试验研究,优化设计出壁厚20.3 mm的X90管线钢管的焊接工艺;通过制管成型参数的优化设计,实现了高强度、大口径螺旋埋弧焊管的低残余应力控制。测试结果表明:试制开发的管径1 524 mm、壁厚20.3 mm的X90螺旋埋弧焊管的各项性能指标均达到相关技术规范要求,为X90高强度大口径钢管在中国的建设应用做好技术储备。

Development of X90 submerged-arc helical welded pipe with diameter of 1524 mm

The use of high pressure,large diameter and high steel grade pipelines for long-distance natural gas transportation have become an important development tendency in the pipeline industry.The application of X90 pipeline steel pipe can raise the pipeline transmission capacity,lower the effective wall thickness of the steel pipe and save the pipeline construction cost.The X90 hot rolled coil,with a wall thickness of 20.3 mm and mainly composed of granular bainite,has been developed by adopting the design of alloying components with low C,high Mn+Nb] and high Mo+Cr],as well as technologies such as pure steel smelting and controlled rolling and cooling.The welding technology for X90 pipeline steel pipe with a wall thickness of 20.3 mm was optimized through experimental research on welding technology,and the low residual stress of high strength and large diameter submerged-arc helical welded pipe was controlled by optimizing design of pipe forming parameters.The test results show that all performance indexes of the trial-manufactured X90 submerged-arc helical welded pipe with a wall thickness of 20.3 mm and the diameter of 1 524 mm meet the requirements of relevant technical specifications,and it would make technical reserves for the construction and application of X90 high strength and large diameter steel pipes in China.