Texture in manufacturing pipeline steels for service in sour environment

****油气运输安全是能源可持续供应的保障。管线断裂可能造成环境灾难和重大经济损失。各种管线钢的氢致开裂（HIC）、硫化物应力开裂（SSC）和应力腐蚀开裂（SCC）是导致管线失效的主要原因。我们和其他研究人员最近发表的信息表明，特殊纹理钢可以提高抗HIC和SCC的能力。这些发现创造了一个新兴的，但完全未开发的机会来制造新一代管道钢，这些管道钢具有高度提高的抗两种主要管道故障的能力。该计划的总体目标是为优化钢的纹理设计新的制造工艺。在全面了解热机械加工对织构形成影响的基础上，对管线钢（X65和X70）的织构和晶界特征进行了分析和改进，并研究了酸性环境下织构对钢性能的影响。对钢在酸性环境下和充氢后的性能进行了大量的试验，将裂纹的形核和扩展与钢的组织和织构联系起来。该项目将为通过织构控制来提高钢的性能提供一种新的方法。在拟进行的研究中，我们计划与EVRAZ公司和CANMET材料技术实验室合作，开发生产新型织构改性管线钢的加工技术，并最终将相关技术转让给加拿大制造公司EVRAZ .**

****Safety of transportation of oil and gas provides a guarantee for sustainable energy supply. The fracture of linepipe may lead to environmental catastrophe and significant economic losses. Hydrogen induced cracking (HIC), sulphide stress cracking (SSC) and stress corrosion cracking (SCC) in various types of linepipe steels are phenomena that are responsible for the majority of linepipe failures. The information recently published by us and other researchers indicates that special textured steels can have improved resistance to both HIC and SCC. These findings create an emerging but completely unexplored opportunity to manufacture new generation of linepipe steels with highly improved resistance to two major type of pipeline failure. The overall objective of the proposed program is designing new manufacturing processes for optimized texturing of steels. The texture and the grain-boundary character of pipeline steels (X65 and X70) will be analyzed and modified based on a complete understanding of the influence of thermo-mechanical processing on texture formation, and the role of texture in steel performance in sour environment will be investigated. Extensive tests of steel performance in sour environment, and after hydrogen charging will be conducted to relate the crack nucleation and propagation to steel structure and texture. This project will offer a novel approach towards the ultimate objective to enhance the steel performance by texture control. In the proposed research we plan to cooperate with EVRAZ Inc and CANMET Materials Technology Laboratory to develop processing technology for production of novel texture-modified linepipe steels, and finally transfer the related technology to Canadian manufacturing company Evraz.**