Improve the ASTM A588 grade B steel plate weather resistance

Ni: nickel is also one of the elements to improve the weather resistance of ASTM A588 grade B steel plate, which can promote the formation of stable rust layer and also improve the welding performance of ASTM A588 grade B steel plate. However, too much nickel element can significantly increase the cost, so the content of nickel is limited to 0.30-0.50%.

NB: NB can improve the strength of ASTM A588 grade B steel plate, and at the same time, Nb can improve the recrystallization temperature of austenite. It can realize non recrystallization zone rolling at higher temperature. However, the reinforcement effect of Nb content on ASTM A588 grade B steel plate is limited, so the content of Nb is limited to 0.01-0.05%.
Among them, the composition of ASTM A588 grade B steel plate is in% mass, and also meets the requirement of Cu + Cr + Ni ≤ 1.35%;

Cu, Cr and Ni are all the key elements that affect the performance of ASTM A588 grade B steel plate. The more the general content, the better the weather resistance of ASTM A588 grade B steel plate.