Summary for steel wire phosphating Discussion
steel wire phosphating after cold drawing is questioned in this thread because Pankaj Bansal asks whether shot blasting can replace acid pickling before drawing and whether zinc phosphating can be done after the wire has already been cold drawn with a dry die lubricant. He asks about the procedure, the phosphate quality to use, and the benefits or losses of post-drawing phosphating. The only reply, from an unnamed respondent, says the premise seems unclear and notes that phosphating is usually done before drawing steel wire, often with wax or oil, to prevent galling and extend die life. The responder asks why phosphating would be needed after drawing, implying that post-drawing phosphating is not the normal sequence and that the intended process should be reconsidered before changing the line.
June 1, 2015
Q. Hi all,
We have a steel wire cold drawing unit.
We want to replace acid pickling with shot blasting system to clean steel wire rod before cold drawing using dry die lubricant.
Our question:
1. Is it possible to achieve satisfactory zinc phosphate coating after cold drawing of steel wire rod?
2. What procedure must be adopted?
3. Any specific zinc phosphate quality should be used?
4. What will be the benefits or losses of doing post zinc phosphating of cold drawing?
Pankaj Bansal
– New Delhi, India
June 16, 2015
? I think I don’t understand the question. Phosphating is often done before drawing steel wire because it (usually along with a wax or oil) prevents galling and increases die life.
Why do you want to phosphate after drawing?
Jeffrey Holmes, CEF
Spartanburg, South Carolina