Evaluation of the in-service weldability of vintage and modern pipeline steels

老式和现代管线钢在役可焊性的评估

• 批准号: 514853-2017
• 负责人: Gerlich, Adrian
• 金额: $ 1.82万
• 依托单位: University of Waterloo
• 依托单位国家: 加拿大
• 项目类别: Engage Grants Program
• 财政年份: 2017
• 资助国家: 加拿大
• 起止时间: 2017-01-01 至 2018-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=639958
• 关键词: Evaluation; service; weldability; vintage; modern

Maintaining the integrity of the oil and gas pipeline network is essential to the energy transport system inCanada. Much of this depends on the ability to weld many of the aging pipeline steels, which may be well over50 years in service. However, over this time steel making practices have changed, along with the weldingprocesses which have tended to favour higher welding speeds and cooling rates for more rapid fabrication andlower costs. The current proposal will build a relationship between the University of Waterloo and StantecConsulting Ltd. The goal will be to develop processing practices and identify the weldability limits for vintagepipeline steels such as X70. Since it is necessary to avoid excessive cooling rates during welding which maylead to formation of hard phases, it is vital to understand what welding parameters will produce weldmicrostructures with good integrity and high toughness. This will be determined by developing continuouscooling transformation diagrams for both vintage and modern X70 pipeline steels. Thermal cycling will beapplied to the steels using a state-of-the-art Gleeble thermo-mechanical testing system to simulate variouswelding thermal cycles and cooling conditions, and correlate these with hardness and toughness. This willprovide key insights in what limiting welding parameters for can be applied in the field to ensure integrity afterin-service repair.

保持石油和天然气管道网络的完整性对于能源运输系统incanada至关重要。这很大程度上取决于焊接许多老化管道钢的能力，这可能已经超过50年了。但是，在此期间，钢制制造实践发生了变化，以及焊接程序倾向于倾向于更高的焊接速度和冷却速度，以实现更快的制造和较高的成本。当前的提案将建立滑铁卢大学和Stantecsconconling Ltd之间的关系。目标是开发加工实践并确定X70等VintagePipeline Steels的可亮性限制。由于有必要避免在焊接过程中过度冷却速率，这使得形成硬相位是至关重要的，因此重要的是要了解哪些焊接参数将产生具有良好完整性和高韧性的焊接物结构。这将通过为复古和现代X70管道钢开发连续的转换图来确定。热循环将使用最先进的gle胶热力学测试系统将钢击中到钢上，以模拟各种焊接的热循环和冷却条件，并将其与硬度和韧性相关联。这将提供有关在野外应用哪些限制焊接参数的关键见解，以确保完整性在服务后修复。