Experimental Investigation of Fracture Performances of SBHS500, SM570 and SM490 Steel Specimens with Notches

High-strength steels (HSSs) with nominal yield stress not less than 460 MPa have been increasingly employed in bridge structures. Compared SM490 normal-strength steel (NSS), HSSs, including SBHS500 and SM570, higher strength but lower ductility, brittle fracture can easily occur the HSSs members notches. Therefore, 48 tension specimens U-notch or V-notch made of SBHS500, SM570 structural are carried out. The influences notch depth, radius, degree chemical composition on mechanical performances investigated. It is concluded from experimental results that a relatively elastic concentration factor, crack initiation appears earlier, more likely to occur. HSS, HSS has better weldability.