When A588GrA steel is heated to a higher heating temperature than Q235B steel, the temperature of the soaking section is 1240 ~ 1260 degree, and the descaling effect of the slab It's better right now. The air-fuel ratio is controlled between 0.5 and 0.7, which can shorten the heating time of the slab in the furnace and reduce the occurrence of "copper brittleness".
The heating system is one of the reasons for the appearance of surface crack defects in American Standard A588GrA low alloy steel. Controlling the temperature of the soaking section of the heating oven at 1240 ~ 1260 degree C can reduce the probability of surface crack defects.
Practice has shown that in the composition design process, adding Ni to A588GrA steel can reduce the probability of surface crack defects of A588GrA steel, so in the actual production process, w (Cu) and w (Ni) are controlled at a more reasonable 0.30% and 0.15% respectively.
