中文摘要：

现代油气管线正面临着高压输送以及低温、大位移、深海、酸性介质等恶劣环境的挑战。为适应管线工程的经济性和安全性的要求,管线钢的发展趋势是高强度、高韧性、大变形性、厚壁、高抗腐蚀性和在恶劣环境下的焊接性。通过合金设计中的微合金化和多元合金化、控制轧制和控制冷却工艺提高管线钢的强度与韧性,满足长距离管线输送能力的经济性要求和应对恶劣环境的安全性要求。

英文摘要：

The modern pipelines used for transporting oil and gas are faced with many challenges,such as high pressure transportation,low temperature,blue water,acid medium and other severe environments.In order to meet the demand of economy and security for pipeline projects,the development trend of pipeline steel is high strength,high toughness,great deformability,thick wall,high corrosion resistance and weldability in severe environments.Through microalloy and multi alloyed in alloy design,as well as controlled rolling and controlled cooling process to increase strength and toughness of pipeline steel,meet economic requirements of long distance transporting pipe capability and security requirement to severe environments.