tel. +886-2-278-45675 (1-30)  fax.+886-2-278-45676  e-mail:




Wire patenting - heat treatment of steel wire (heating to 870-950°C, cooling to 450-550°C in salt or lead melt, isothermal holding and further cooling in air or in water) used to obtain a thin-plate ferrite-carbide microstructure. The purpose of patenting is to improve the ductility of the metal.

Before drawing, the wire is patented. In this case, supercooled austenite turns into a thin-plate structure - sorbitol. This is one of the methods of isothermal hardening in the preparation of metal for cold drawing with a large total compression.

Usually, after isothermal heat treatment, the metal undergoes subsequent deformation with large degrees (up to 90%).

The patented wire with the same strength as hardened and tempered, withstands large degrees of compression and acquires much higher properties after drawing. The patented wire has higher strength and elasticity than hardened and tempered wire after drawing: in the first case, the hardening achieved by heat treatment is supplemented by mechanical hardening during drawing, while in the second case, this mechanical hardening is significantly reduced as a result of recrystallization occurring when heated to hardening.

The patented wire is used to produce high strength wire rope and spring wires (the big advantage of the patented wire is that the winding springs do not need to be hardened).

appearance of the steel wire heat treatment line

appearance of the steel wire heat treatment line

Steel Wire Patenting Line Application

  • Patenting and surface preparation for steel wire to make sure the drawing process goes smoothly and successfully.
  • Making hot-finished steel wire rod to have appropriate sorbate content to ensure that the drawing can be carried out normally.
  • Making steel wire’s organization special.
  • Increasing wire’s performance after drawing.

Equipment Advantages

  • Brightening of the wire surface, no damage to the surface of the wire.
  • Low operating cost, high efficiency and energy-saving.
  • Beautiful construction, simple and safe to operate and maintain.
  • European and American advanced technology.

Carbon content: 0.4-1.0%, Wire diameter – Ø0.6 - 2.8 mm (According to customer’s requirements)

appearance of the steel wire heat treatment line

appearance of the steel wire heat treatment line

appearance of the steel wire heat treatment line

Process Step of Steel Wire Patenting

The wire patenting line consists of an unwinding mechanism for wires in a thread; degreasing and washing baths, preheating unit; patenting unit; cooling baths; pickling baths; baths for applying a lubricant coating, washing and drying; vertical winding devices and tension devices.

Theoretically, patenting is the rapid cooling of the wire in the austenitic state to a preset temperature with subsequent holding for more than the time of isothermal decomposition at this temperature to obtain a sorbitol structure.

The sequence of the steel wire patenting: Pay off Wire adjustment Furnace Patenting Quench Acid Picking Rinsing Boraxing Dry Furnace Take up.

Process Step of Steel Wire Patenting
The technology used on this equipment excludes hardening in the lead bath. The above process step of patenting is only for reference. We can design and manufacture the most suitable production line according to customers' requirements.

Technical parameters of the Steel Wire Patenting Line

MaterialCarbon content 0.4 - 1.0%
Wire diameterØ0.6 - 2.8 mm
Wire number8 - 40 (according to customers' requirements)
Line speed10 - 75 m/min
Weight of coating4 - 8 g/kg
Working hours24 hours continuously
Production capacityAccording to customer’s needs

Video of the Operation of the Steel Wire Patenting Line

appearance of the steel wire heat treatment line

Information required for the proposal

Which information is needed to make a proposal?

  1. Wire material.
  2. Diameter range.
  3. Wire numbers.
  4. Coating weight.
  5. Capacity.
  6. Pay-off and take-up method: spool/bobbin, spindle, spider / other.

For detailed information on the components included in the Steel Wire Heat Treatment Line, see the page SURFACE TREATMENT LINES COMPONENTS

Copyright © 2007 - 2024 Rost Group & Technology Co., Ltd 
(coordinator and exclusive representative)