METHOD OF CONTINUOUS THERMOMECHANICAL PROCESSING OF RODS

摘要

The invention relates to ferrous metallurgy, in particular to manufacture of rods of stainless steel for welding purposes, and can be used by a high speed continuous mill of rod stock and wire equipped with a mill block and a Stelmor line of two-stage cooling of rods. A method of continuous thermomechanical processing rods includes hot rolling rods and two-stage cooling thereof. At the first stage the rods are cooled by water to the temperature of equilibrium austenitic state - 950-1000 °C at speed of 125-625 °C/s. At the second stage air-cooling is carried out in two steps: first step – by fan air at speed of 1.2-1.7 °C/s, and at the second step the rod turns are held in the temperature range of 550-700 °C (differentially depending on steel grades) for 600-1000 s for their slow cooling at the rate of not more than 0.03 °C/s. The invention provides increased ductility of rods, and eliminates the risk of rod and wire breakage of in the case of their processing with a significant degree of deformation during drawing, without intermediate heat treatments.