Stage 03 · Size
Cold-drawn through carbide dies to the final diameter, with a bright finish.
Overview
Drawing is where rod becomes wire. The coil is pointed, threaded through a tungsten-carbide die and pulled by a powered block. The die is slightly smaller than the rod, so the steel is stretched and squeezed to a new, precise diameter. On our inverted vertical drawing (IVD) machine, the finished wire drops into a coil beneath the block — suited to heavy coils and larger sizes.
Inside the die
Set the incoming and drawn sizes to see how much the section is reduced.
- Reduction of area
- 23.4 %
- Elongation
- 30.6 %
Reduction of area = 1 − (d₂ / d₁)². Higher reductions add more strength; very heavy single-pass reductions are split into several passes.
Why it matters
01
Precise size
The die sets the diameter. Hot-rolled rod varies; drawn wire is held to a much tighter size and roundness.
02
Bright surface
The polished die burnishes the surface to a bright, smooth finish ready for heading or machining.
03
Controlled strength
Cold drawing work-hardens the steel. The amount of reduction sets how much strength is added.
Step by step
- 01
Pointing
The coil end is reduced so it can be threaded through the die.
- 02
Threading
The point is passed through the die and gripped by the drawing block.
- 03
Drawing
The block turns and pulls the wire through the die at a steady speed, lubricated by drawing soap.
- 04
Coiling
On the IVD layout the finished wire falls into a neat coil below the block.
- 05
Tagging
Each finished coil is tagged with grade, size and heat for traceability.
Enquiries
We come back with availability and a quotation — usually the same working day.