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首页> 外文会议>Iron Steel Supplement 2005 vol.40: The Joint International Conference of HSLA Steels 2005 and ISUGS 2005 >An Alloy Design Concept for Better Matching of Strength and Toughness in Pipeline Steels-Its Development and Application
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An Alloy Design Concept for Better Matching of Strength and Toughness in Pipeline Steels-Its Development and Application

机译：更好地匹配管线钢强度和韧性的合金设计理念及其开发和应用

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The metallurgy of niobium microalloyed steels became to be better understood and spread worldwide in the 1970's. Based on industrial trials in the 1970's and 1980's, an industrial demonstration heat was produced in 1985. It allowed intensifying the deformation in the non-recrystallization region of austenite at higher rolling temperatures and thus, it was called the HTP (High Temperature Processing) concept. The extended delay in austenite recrystallisation, obtained by the strong effect of niobium, allowed more flexible rolling schedules in plate mills, making it possible to obtain high toughness levels, in addition to high strength, even in plate mills with power limitation and having relatively low separating forces. In more recent years, with further development of technology in the steel industry, very low carbon levels, well below 0.10%, became possible for applications like in line pipe steels. Under this condition, the HTP steels combine an additional effect of niobium by lowering the transformation temperature, promoting bainitic microstructures with excellent toughness and weldability at very high strength levels. As a result, the HTP steels became a reality in the market, where combination of several properties at high levels are desired. For instance, those steels have been applied in important pipeline projects, including the recently concluded, over 4,000 km long, West-East Pipeline in China. This paper summarizes the development of the HTP steels, describing the metallurgical concept, more flexibility in thermomechanical processing conditions, final product alloy design, microstructure and mechanical properties as well as its application in pipeline projects.
机译：铌微合金钢的冶金学在1970年代得到了更好的理解并在世界范围内广泛传播。根据1970年代和1980年代的工业试验，1985年产生了工业示范热。它允许在更高的轧制温度下强化奥氏体非重结晶区的变形，因此被称为HTP（高温加工）概念。由于铌的强效作用，奥氏体再结晶的延迟得以延长，从而使平板轧机的轧制计划更加灵活，即使在功率受限且相对较低的平板轧机中，除高强度外，还可以获得较高的韧性水平分离力。近年来，随着钢铁工业技术的进一步发展，极低碳含量（远低于0.10％）已成为管线钢等应用的可能。在这种条件下，HTP钢通过降低相变温度而结合了铌的其他作用，从而在非常高的强度水平下促进了贝氏体组织，具有出色的韧性和可焊性。结果，HTP钢在市场上成为现实，需要将几种高水平的性能结合起来。例如，这些钢被用于重要的管道项目，包括最近完成的，全长超过4000公里的中国东西管道。本文概述了HTP钢的发展，描述了冶金概念，热机械加工条件中的更大灵活性，最终产品合金设计，显微组织和力学性能及其在管道项目中的应用。

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