Piercing process of continuously cast half-finished products on rolling trains with automatic

摘要

In the present invention there is disclosed a piercing process of continuously cast half-finished products on rolling trains with automatic, where relative depression {epsilon} of the half-finished product is maintained according to the relation {epsilon} = (Do-b/Do).100, in which Do represents starting diameter of the half-finished product and b represents a distance between rolls, during forming on the piecing mill within the range of 12.5 to 18.5 percent.