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  4. FAQ-31

What is patenting?

  • Patenting refers to the production of a fine lamellar pearlite structure in rod wire
  • Isothermal transformation can be achieved in low-alloy, largely eutectoid grades of steel
  • The wire attains high strength and ductility as a result of this heat treatment
  • Patenting by immersion in a bath is used to treat a wire coil; in the case of continuous patenting, the strands of unwound wires proceed next to one another through the heat treatment
  • Heating above the transformation point can be carried out in gas-heated furnaces or by means of resistance heating
  • Cooling takes place in a lead bath at 500 °C, or in air (air patenting)
  • The fine pearlite constitutes a favourable initial structure for subsequent drawing
  • In the case of multiple drawing, patenting is also repeated at intervals.Inventor: William Smith in 1870
  • The name “patenting” originated from the carefully guarded patent