How to achieve the good quality of stainless steel spring wire

It is related to manufacturing technology and we give an illustration as follows.

Sample:
Stainless steel spring wire (SS 304H)
Target wire size of 0.20mm with T/S 2050-2400 Mpa

Our essential process:
Step 1: Confirm the wire rods with grade of SS 304 or SS 304H and the carbon content of 0.06-0.08% in percentage as customer required from China qualified stainless steel plant.

Step 2: Confirm the former working process of pickling and annealing are qualified for following wire drawing.

Step 3: Confirm the inlet wire diameter should be 0.60mm, since the general compression ratio controlled at 80-90% is preferable for SS spring wires.

Step 3: Confirm the dies is the right choice as we required, including the dies material, dies compression angle and dies belt length ratio.

Step 4: Confirm the dies in the tank with righ sizes and rows of arrangement for wire drawing. For instance, 0.20→0.22→0.24→0.27→0.30→0.34→0.38→0.43→0.48→0.54 (totally 10 dies in use is better)

Step 5: The spring wire straightener should be installed in the wire drawing machine in order to achieve the perfect straightness circle.

Since the last three dies (0.20/0.22/0.24) are really more important for final product, it is necessary for us to keep close observation and timely replace qualified dies during manufacturing.

Above is just part of SS spring wire technical knowledge in working, and honestly hope it could be helpful to anyone if require.