The role of steel chemistry on the microstructure/properties in the heat affected zone for high strength linepipe

钢化学对高强度管线管热影响区显微组织/性能的作用

• 批准号: 505656-2016
• 负责人: Poole, WarrenJ
• 金额: $ 9.98万
• 依托单位: University of British Columbia
• 依托单位国家: 加拿大
• 项目类别: Collaborative Research and Development Grants
• 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=618431
• 关键词: role; steel; chemistry; microstructure; properties

Pipelines to transport energy (natural gas and liquids) are an integral part of the North American energy landscape. Canada alone has more than 75,000 km of natural gas and 25,000 km of liquids (e.g. refined oil and bitumen) pipelines. Further, there are proposals to construct new pipelines such as TransCanada Pipeline's Energy East project to deliver oil products from Alberta to refineries on Canada's east coast (4,500 km 1.1 million barrels of oil per day). The safe and economic construction and operation of this extensive pipeline network is of strategic importance to Canada. There is a trend towards using pipelines of larger diameter and/or increasing the operation pressure of the pipeline to improve the throughput of the system. This leads to using higher strength linepipe steel grades to avoid using thicker wall linepipe steel. The current state of the art uses X70 or X80 steel grades (yield stress of 490 and 560 MPa, respectively). Using higher strength steels translates into less material being required thereby lowering material and transportation cost. One of the engineering challenges for these materials is the development of robust manufacturing and in field joining processes, i.e. girth welds. This project addresses aspects related to the mechanical behavior of the steels used and, in particular, the effects of welding on these properties for a range of different steel chemistries. Currently, the evaluation of steels follows performance based specifications such as the yield stress, i.e. the composition of the steel is not explicitly considered. There are two fundamental challenges that face the industry. For steel producers such as Evraz, the challenge relates to chemistry optimization (in particular, the appropriate alloy additions of Cr, Mo and Nb). On the other hand, pipeline constructors/operators such as TCPL have to understand how the different steels will respond to the heat input from welding during the construction of the pipeline. The results from this project will be i) an increased knowledge base for the microstructure/mechanical properties in the heat affected zone for advanced, ii) transfer of this knowledge to our industry partners and iii) the education of 5 high qualified personal (3 Ph.D., 2 PDFs)

输送能源（天然气和液体）的管道是北美能源景观的组成部分。仅加拿大就有超过75，000公里的天然气管道和25，000公里的液体（例如精炼油和沥青）管道。此外，还有人提议建造新的管道，如横贯加拿大管道公司的能源东部项目，将石油产品从阿尔伯塔输送到加拿大东海岸的炼油厂（每天4，500公里，110万桶石油）。安全和经济地建设和运营这一广泛的管道网络对加拿大具有重要的战略意义。存在使用更大直径的管道和/或增加管道的操作压力以提高系统的吞吐量的趋势。这导致使用更高强度的管线钢等级，以避免使用更厚壁的管线钢。现有技术使用X70或X80钢等级（屈服应力分别为490和560 MPa）。使用更高强度的钢意味着需要更少的材料，从而降低材料和运输成本。这些材料的工程挑战之一是开发稳健的制造和现场连接工艺，即环焊缝。该项目涉及与所用钢的机械性能相关的方面，特别是焊接对一系列不同钢化学性质的这些性能的影响。目前，钢的评估遵循基于性能的规范，例如屈服应力，即钢的组成没有明确考虑。该行业面临两个基本挑战。对于Evraz等钢铁生产商而言，挑战涉及化学优化（特别是Cr、Mo和Nb的适当合金添加）。另一方面，管道建设者/运营商（如TCPL）必须了解不同的钢材如何响应管道建设期间焊接产生的热量输入。该项目的结果将是：i）增加先进热影响区微观结构/机械性能的知识基础，ii）将这些知识转移给我们的行业合作伙伴，iii）培养5名高素质人员（3名博士，2份PDF）