深水立管的尺寸精度影响因素及生产实践

Factors Affecting Dimension Accuracy of Steel Pipe Serving as Deep-water Riser and Relevant Production Practice

介绍了深水钢悬链线立管用无缝钢管的尺寸精度对疲劳性能的影响。分析了影响无缝钢管乳管尺寸精度的主要因素。通过控制管坯成分均匀性和加热均匀性,控制轧管工模具的轧制支数和装配精度,保证轧制线设备中心线精度和管端内镗加工精度等,成功试制了小批量立管。加工后的样管管端壁厚精度±1.0 mm,管端内径精度±0.25 mm,满足相关技术要求。

Described in the paper is the effect by the dimension accuracy on fatigue-resistance of the seamless steel pipe used as the deep-water steel catenary riser.The key factors affecting the rolling dimension accuracy of the seamless steel pipe are analyzed.As a result,the small-lot trial production of the riser-purposed seamless steel pipe is successfully carried out by means of such actions as properly controlling the homogeneities of both the chemical composition and heating of the billet,controlling the total rolling number and the assembly accuracy of the pipe-rolling tools and dies,and ensuring the central line accuracies of the facilities on the rolling line as well as the boring accuracy of the pipe end.The pipe end wall thickness accuracy and pipe end ID accuracy of the sample pipe as processed are separately±1.0 mm and±0.25 mm,which has met applicable technical requirements.