Design characteristics of A588 Grade A weathering steel plate chemical composition

The chemical composition design principle of A588 Grade A weathering steel plate is to reduce the addition of various alloying elements as much as possible on the premise of ensuring the strength, toughness, weathering resistance and composition requirements of the steel, so as to minimize the alloy cost and maximize the benefits. A588 Grade A weathering steel plate Chemical Composition Design Features:

(1) Two microalloying elements, Nb and Ti, are used to play the role of grain refinement strengthening and precipitation strengthening;

(2) In order to reduce the precipitation of MnS inclusions in the A588 Grade A weathering steel plate, the mass fraction of S in the A588 Grade A weathering steel plate is controlled below 0.004%;

(3) Adjust the element content of Cu, Cr and Ni within a certain range, the mass fraction of Cu is reduced from 0.35% to 0.22%, the mass fraction of Cr is reduced from 0.60% to 0.40%, and the mass fraction of Ni is reduced from 0.25% to 0.13%, with To study the effect on corrosion resistance stability of A588 Grade A weathering steel plate.