Wire rod - → shelling and derusting - → Pickling - → water washing - → high pressure water washing - → phosphating - → washing - → saponification - → drying
Some units will use this technology for the general spring steel wire blank and half of the drawing. But in heat treatment, it is only suitable for electric contact furnace, not for fuel heat treatment furnace, because it will cause muffle brick furnace hole blockage (electric contact furnace has no such defect).
This process is not suitable for the pickling of the blank. For the coarse wire rod, the residual phosphating layer after drawing is thick, which will lead to lead hanging, especially to the high-grade steel wire, and the cost is high.