Technological manufacturing method of spring steel wire

The manufacturing methods of various spring steel wires are as follows:
Process flow of raw drawing spring steel wire: (steel) wire rod — surface treatment — wire drawing (mattress steel wire can be used in this method) lead quenching spring steel wire: conduct lead bath quenching in the middle specification of wire rod size or cold drawing, and then carry out surface treatment and wire drawing
Galvanized spring steel wire: it is usually hot-dip plated or electroplated in the finished product size, or cold drawn to the specified size after pickling and hot plating

Oil quenched spring steel wire: carbon steel or alloy steel can be used as required. After surface treatment and cold drawing to the finished product size, quenching and tempering treatment is carried out. This process is widely used in steel wire for automobile suspension spring and valve spring, and ordinary spring can also be used

Heat treatment: lead bath quenching process is commonly used for carbon steel spring steel wire, which can obtain very fine pearlite structure (sorbite). It is beneficial to improve deep drawing performance and spring performance. The replacement process of lead bath fluidized bed has not been popularized, and it has been applied in some small diameter steel wires, The purpose of heat treatment of stainless steel wire is to improve the microstructure to meet the needs of drawing

Surface treatment: pickling and phosphating are generally used to remove scale and form phosphating film
Wire drawing: the drawing process of the finished product has a great influence on the product performance. Generally, 90% of the total reduction rate (see area reduction rate) and small pass reduction rate (about 10% – 20%) are used to ensure the toughness of the product. For high strength spring steel wire, the outlet temperature of each pass should be controlled to be lower than 150 ℃. Therefore, good lubrication and sufficient cooling must be provided during drawing, It is helpful to reduce the temperature rise of steel wire by using smaller pass reduction rate and drawing speed