JFE采用TMCP工艺生产韧性优良的高强H型钢

JFE制钢公司开发出采用先进的热机械控轧工艺（TMCP）生产高性能H型钢的技术。为了能够获得具有优良韧性的高强度H型钢，尽管可以通过采用适当的合金方案，但最重要的一点是在最佳热轧条件下进行热轧以及热轧后加速冷却，以获得精细的贝氏体显微结构。介绍最新开发的高性能H型钢的一些例予，诸如应用于高层建筑施工中的520MPa级（抗拉强度）H型钢，该型钢具有优良韧性、焊接性和抗震性等特点；而490MPa级（抗拉强度）H型钢，则具有优良的低温韧性特点。在特定的热轧条件下，合金设计可以使H型钢获得精细的显微结构，但加速冷却设备（Super—OLACS：型钢用在线加速冷却，OLACS是日本注册商标）在高性能H型钢开发中起到关键性作用。

High Strength H-Shapes with Excellent Toughness Developed by JFE Based on Advanced Thermo-Mechanical Control Process

JFE Steel has developed high performance H-shapes applying an advanced thermo-mechanical control process （TMCP）. To obtain high strength H-shapes with excellent toughness, it is important to obtain refined bainite microstructure, through suitable alloy design, hot rolling under the optimum rolling conditions, and accelerated cooling after hot rolling. This paper introduces examples of recently developed high performance H-shapes, such as 520MPa grade （in tensile strength） H-shapes for high-rise building construction application with excellent toughness, weldability and earthquake resistant properties, and 490MPa grade （in tensile strength） H-shapes with superior low temperature toughness. Alloy designing to obtain refined microstructure under the specific hot rolling conditions to H-shapes, and the accelerated cooling facilities for shapes （Super-OLAC S： On-line Accelerated Cooling for Shapes. OLAC is a registered trademark in Japan） are essential for the development of high performance H-Shapes.