新一代高强塑性钢的开发与应用

Development and Application of A New Generation High Strength-plasticity Steels

为满足汽车、建筑、能源等工业对材料强度级别和使用性能不断提高的要求,世界钢铁业正在开发新一代高强塑性钢。基于先进高强度钢AHSS汽车板、高强度抗震建筑用钢和高等级管线钢的开发,讨论了新一代高强塑性钢的主要技术特征,包括使用性能(成形性、抗冲撞能力、抗震性能、抗皱能力、超载下的形变能力)对塑性指标(均匀延伸率、n值、屈强比)的要求、复相组织与残余奥氏体的强塑化机理、关键工艺技术以及新产品新技术的发展方向。同时考虑到对强韧性和焊接性能的要求,讨论了热变形奥氏体动力学模型、高韧性焊接热影响区HAZ的细化韧化以及硫含量的影响与控制。

To meet the increasing requirement of automotive,construction and energy industry on high strength and high performance of structural materials,a new generation of high strength-plasticity（HSP） steels has been developed by the steel industry in the world.Based on the development of advanced high strength steels AHSS,high strength steels for construction and high grade pipeline steels,the main features of HSP steels are discussed,including the requirement of performance（formability,crashworthiness,aseismic ability,buckling resistance and deformability） on plasticity index（uniform elongation,n-value,yield ratio）,the strengthening-plasticizing mechanism with multiphase structure and retained austenite,key process and technology as well as the promised new products and new techniques.For the necessary toughness and weldability,the dynamic model for austenite recrystallization,high toughness welding HAZ refinement and toughening and the effect of sulfur content are also discussed.