Method for the Direct Patented Rod in the Fluidized Bed

There has been a strong demand for a process where patenting treatment before drawing is omitted with a view to rationalizing and improving efficiency of the production of high carbon steel wires. As a means to meet the demand, a new process named the Direct Patenting Treatment has recently been developed with success. In this new process, hot rolled wire rods, having been passed through the finishing roll stand, are treated in the cooling zone followed by the treatment in the fluidized bed filled with zilcon sand. Test on the new process has been made with high carbon steel wire and wire for cold heading. The test results and the characteristics of the process are as follows. 1. The variation in the mechanical properties of coil is very little. 2. Particularly with high carbon steel, it is possible to control tensile strength by means of changing the temperature of fluidized bed. 3. Conventional patenting treatment is not necessary. 4. The processed material has excellent properties concerning pickling, drawing, forming and spheroidizing. The mechanical properties of the wire drawn by this process are excellent too.