日本两公司开发的大热输入焊接用高强度钢

为了提高船舶及建筑结构等的焊接效率，必须采用大热输入焊接等措施。介绍了日本各钢铁公司研究开发的多种新技术，包括利用TiN对热影响区晶粒长大进行有效控制，依靠铁素体形核核心手段实现晶粒细化，并利用控制热影响区微观组织以及采用TMCP控制轧制技术等。在综合利用这些技术的基础上，开发成功了各种适合于大热输入焊接的高强度钢，以确保大热输入条件下热影响区具有高的韧性，用于造船、建筑结构、桥梁等的建造。 

High Strength Steel for Welding with High Heat Input Developed in Japan

In order to improve the welding efficiency of ship structure and building structure, high heat input welding should be used. Two Japanese companies had developed many technologies, including effective control of grain size in HAZ by using TiN, refining grain by ferrite nucleation, and the control of microstructure in HAZ and the TMCP controlled rolling technology, etc. By combining these new technologies, high strength steels for welding with various high heat inputs were successfully developed, which could be used in shipbuilding, buildings, bridges and ensure the toughness of HAZ with high heat input.