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低合金高强度钢起始于二十世纪初期,主要用于结构和建筑,那时基本是铆接件,所以设计主要按抗拉强度而很少注意韧性、可成形性和可焊性。廉价的碳(含量0～0.3％)是主要的合金元素,在有些情况下,含有最多为1.5％的锰。焊接生产的推广和改善韧性的需要不但须要降低含碳量,同时还认识到屈服应力是比抗拉强度更加重要的设计依据。二十世纪五十年代,铁素体晶粒细化对屈服应力和韧性的有利影响以及锰在降低奥氏体-铁素体转变温度方面的重要性已完全为人们所接受。组织一性能相互关系的
Low-alloy high-strength steel began in the early twentieth century, mainly for the structure and construction, then the basic riveting, so the design is mainly based on the tensile strength with little attention to toughness, formability and weldability. Cheap carbon (0 to 0.3%) is the main alloying element and in some cases contains up to 1.5% manganese. The need to promote welding and improve ductility not only requires a reduction of carbon content, but it is also recognized that yield stress is a more important design basis than tensile strength. The favorable effects of ferrite grain refinement on yield stress and toughness and the importance of manganese in reducing austenite-ferrite transformation temperatures have been completely accepted in the 1950s. Organize a performance interrelationship