中文摘要：

造船高效化迫切要求船体钢具备良好的大线能量焊接性能,而氧化物冶金技术因其特有的双重细化晶粒效果得以在船体钢开发中起到重要作用。系统地回顾了奥氏体晶内铁素体的形核机制及影响因素,并详细评述了以新日铁为代表的国内外钢铁企业在大线能量焊接用船体钢开发过程中的实践,进而提出了大线能量焊接用船体钢的开发。在理论研究的进一步深化外,在实践方面,应在确定焊接输入线能量与钢板厚度关系的基础上,探明输入线能量与该能量输入下能够稳定诱发晶内铁素体的夹杂物构成的匹配关系,这是经济、高效生产大线能量焊接用船体钢以及其他焊接用结构钢的关键。

英文摘要：

High efficiency shipbuilding demands the steel to be welded with large heat input, and with the double effects of grain refining, the oxide metallurgy technology starts to play an important role. In this paper, the austenite intragranular ferrite nucleation mechanism and effect factors had been concluded,and the application and development of high heat input welding shipbuilding steel which represented by Nippon Steel had also been reviewed in detail. For the development of large heat input welding steel, besides the further deepen of the theoretical research, in application, based on the determined relationship between welding heat input and the steel plate thickness, to find out the relatianship between the welding heat input and with one welding heat input which kind of inclusions could induce the IGF atably, This is the key to produce the high heat input welding shipbuilding steel and other structural steels for welding economically and efficiently.