High-strength ultra-thick H-beam steel

摘要

This H-beam steel has a composition including C, Si, Mn, Cu, Ni, V, Al, Ti, B, N, and O, and further including at least one of Mo and Nb, in which Ceq obtained in Equation 1 described below falls in a range of 0.37 to 0.50, the thickness of a flange falls in a range of 100 to 150 mm, and the area fraction of bainite at a depth of one quarter of the thickness of the flange from the external surface of the flange is 60% or more.Ceq=C+Mn/6+(Mo+V)/5+(Ni+Cu)/15  Equation 1,where C, Mn, Mo, V, Ni, and Cu represent the amount of each element contained.