Improving low-temperature weld seam toughness of electric resistance welded X70 line pipe

提高X70管线管电焊缝低温韧性

• 批准号: 507455-2016
• 负责人: Li, Leijun
• 金额: $ 4.66万
• 依托单位: University of Alberta
• 依托单位国家: 加拿大
• 项目类别: Collaborative Research and Development Grants
• 财政年份: 2018
• 资助国家: 加拿大
• 起止时间: 2018-01-01 至 2019-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=657466
• 关键词: Improving; low; temperature; weld; seam

In response to the increased public expectations on safety, security, and environmental protection, the pipeline industry is targeting pipelines with zero material defects through develop and implement new technologies. Electric resistance welded (ERW) linepipe in the 70KSI yield strength (X70) range holds great promise to meet the technical requirements for strain based design and high toughness at extremely low temperatures. It meets current regulatory demand that proven, safe, and reliable technology (instead of a higher strength grade, for instance) should be used in order to minimize any environmental risks. The quality of ERW linepipe depends on the performance of its longitudinal bondline, which in current X70 linepipe can exhibit excellent toughness at -5 degree C, but can exhibit an inconsistently low toughness at lower temperatures. Toughness is a measurement of steel's capability to resist fracture, therefore, it is a key mechanical property to ensure the safety of a pipeline. ****The research objectives of this CRD project are, (1) to determine the key microstructure features and low-temperature toughness of the bondline of ERW X70 linepipe as influenced by how the welding is done, and (2) to fundamentally understand the welding process by mathematical modeling the temperature and deformation during ERW of X70. The anticipated value for Evraz from the project involves economic benefits from higher quality and lower costs in products and applications, and improved competitiveness. In addition, this project will contribute highly qualified personnel to the Canadian workforce.

为了回应公众对安全，保障和环境保护的期望，管道行业的目标是通过开发和实施新技术来实现零材料缺陷的管道。 70KSI屈服强度（X70）范围中的电阻焊接（ERW）线管具有巨大的希望，可以满足基于应变的设计的技术要求和在极低温度下的高韧性。它符合当前的监管需求，该需求应使用经过验证，安全和可靠的技术（例如，强度等级），以最大程度地降低任何环境风险。 ERW线条管的质量取决于其纵向键线的性能，在当前的X70 Linepipe中，在-5级C下可以表现出极好的韧性，但在较低温度下可能表现出不一致的低韧性。韧性是钢铁抵抗断裂能力的测量，因此，它是确保管道安全性的关键机械性能。 ****该CRD项目的研究目标是：（1）确定ERW X70线管的键线的关键微观结构特征和低温韧性受到焊接方式的影响，以及（2）从X70的ERW期间的数学建模和变形，从根本上了解焊接过程。该项目的EVRAZ的预期价值涉及从较高质量和产品和应用中成本较低的经济利益，并提高了竞争力。此外，该项目将为加拿大劳动力贡献高素质的人员。