Grooving corrosion is a major form of corrosion and is prone to occur when high-frequency electric resistance welded （HFW） pipes are being used. Therefore,grooving corrosion is one of the performance indexes of HFW ...Grooving corrosion is a major form of corrosion and is prone to occur when high-frequency electric resistance welded （HFW） pipes are being used. Therefore,grooving corrosion is one of the performance indexes of HFW products. Grooving corrosion usually occurs along the welding fusion line, resulting in one or more corrosion grooves. The main factors affecting grooving corrosion include the contents of alloying elements and impurities （especially sulphur） in the steel,the microstructure of the welds and the steel substrate, welding parameters and the service environment as well. In this study, the existing methods for assessing grooving corrosion were systematically reviewed, improvements and new methods were proposed and developed to overcome the shortcomings of the existing methods, such as inaccuracy and excessive research time. By comparison with the existing methods, the operational procedures and the characteristics of the new methods are introduced, and issues regarding the behavior of grooving corrosion and their assessment methods, which both need further research,are discussed in this study.展开更多
详细介绍了准508 mm HFW直缝焊管排辊成型机组轧制力的测试方法。采用电阻应变式传感器测量法,测试了递送机架、预成型机架和精成型机架的轧制力以及排辊成型段管坯对排辊的作用力。通过试验分析了HFW焊管成型过程中轧制力的分布状态以...详细介绍了准508 mm HFW直缝焊管排辊成型机组轧制力的测试方法。采用电阻应变式传感器测量法,测试了递送机架、预成型机架和精成型机架的轧制力以及排辊成型段管坯对排辊的作用力。通过试验分析了HFW焊管成型过程中轧制力的分布状态以及对成型性能的影响,从而合理调整轧制工艺参数(轧辊压下量的调整、排辊的位置和角度的调整、下山量的调整等),使得整个成型过程的力能分布比较合理,保证了轧制过程顺利进行,并为后续的理论研究提供了技术支撑。展开更多
文摘Grooving corrosion is a major form of corrosion and is prone to occur when high-frequency electric resistance welded （HFW） pipes are being used. Therefore,grooving corrosion is one of the performance indexes of HFW products. Grooving corrosion usually occurs along the welding fusion line, resulting in one or more corrosion grooves. The main factors affecting grooving corrosion include the contents of alloying elements and impurities （especially sulphur） in the steel,the microstructure of the welds and the steel substrate, welding parameters and the service environment as well. In this study, the existing methods for assessing grooving corrosion were systematically reviewed, improvements and new methods were proposed and developed to overcome the shortcomings of the existing methods, such as inaccuracy and excessive research time. By comparison with the existing methods, the operational procedures and the characteristics of the new methods are introduced, and issues regarding the behavior of grooving corrosion and their assessment methods, which both need further research,are discussed in this study.
文摘详细介绍了准508 mm HFW直缝焊管排辊成型机组轧制力的测试方法。采用电阻应变式传感器测量法,测试了递送机架、预成型机架和精成型机架的轧制力以及排辊成型段管坯对排辊的作用力。通过试验分析了HFW焊管成型过程中轧制力的分布状态以及对成型性能的影响,从而合理调整轧制工艺参数(轧辊压下量的调整、排辊的位置和角度的调整、下山量的调整等),使得整个成型过程的力能分布比较合理,保证了轧制过程顺利进行,并为后续的理论研究提供了技术支撑。
