An investigation was carried out to determine the impact strength and the fracture toughness of the multipass submerged arc (SA) weld metal of A533 grade B (20MnMoNi55) composition using Charpy V-notch and precracked Charpy-type specimens. The experimental results show that there is no large difference between the micro-hardness measured in the primary and secondary zones of the SA weld metal. The Charpy V-notch impact and fracture mechanics tests yield similar results in the primary and secondary zones. Nearly all specimens investigated exhibit the phenomenon of crack jump (“pop-in” of the load), that is, sudden cleavage or quasicleavage often followed by arrest of the crack.