一、前言 结构钢材的使用性能中最主要的是机械性能,而机械性能中强度又居首位。近三十年来,由于轻型结构的要求,结构钢正朝着高强度方向发展,形成了一系列的低合金高强度(HSLA)钢或微合金化钢,广泛应用于桥梁、船舶、车辆、容器、高层建筑、输 First, the foreword The use of structural steel performance is the most important mechanical properties, mechanical properties and strength in the first place. For nearly three decades, due to the demand for lightweight structures, structural steels are moving towards high strength, forming a series of HSLA or microalloyed steels that are widely used in bridges, ships, vehicles, containers High-rise buildings, lose