780-N/mm2 Class High Tensile Strength Steel Plates with Large-Heat-Input-Weldability and Low-Weld Cracking-Susceptibility for Architectural Construction

摘要

Two steels were developed for use as new 780-N/mm2 high-tensile strength heavy-gage steel plates (HT780) forsuper highrise buildings. One (steel A) is a 1.4Ni-B steel mainlydesigned to ensure the desired toughness of the heat-affected zone(HAZ) of large heat input welds.