Performance requirements of stainless steel wire for high-strength springs:
Stainless steel wire, also known as stainless steel wire, is a variety of silk products of different specifications and models made of stainless steel. The origin is the United States, the Netherlands, and Japan, and the cross section is generally round or flat. Common ones with good corrosion resistance and high cost performance Stainless steel wire is 304 and 316 stainless steel wire. Hardware spring
Stainless steel wire drawing (stainless steel wire drawing) is a metal plastic processing process in which the wire rod or wire blank is drawn from the die hole of the wire drawing die under the action of the drawing force to produce small section steel wire or non-ferrous metal wire. Metal wires with different cross-sectional shapes and sizes of metals and alloys can be produced by drawing. The drawn wires have accurate dimensions, smooth surface, simple drawing equipment and molds, and easy manufacturing.
The deformation index of the drawing process
During the drawing process, the cross-section of the wire decreases and the length increases. The cross-sectional area and length of the wire before and after drawing are represented by F., F and L., L respectively. The main index of drawing deformation is calculated by the following formula :
The main index calculation formula of drawing deformation
In the use of high-strength springs, early piano wire was used more commonly, but the corrosion resistance was very poor. In order to prevent rust, chromate treatment was required. In the past, crude steel was given a zinc coating to make it have a self-corrosion effect, but for To prevent it from being placed in the atmosphere and cause discoloration, chromate treatment must be carried out after plating. Chromate treatment is a chemical treatment of the coating, and the coating contains hexavalent chromium. It is problematic from the perspective of environmental protection. High-strength stainless steel wire This problem can be solved very well.
When cold working, the high tensile strength spring wire can maintain good toughness by controlling the dense strain martensite structure, making it a high-strength stainless steel wire for springs comparable to piano wire. Because it belongs to the austenitic system, it It has good corrosion resistance and is a very environmentally friendly material. Its main features are:
(A) Excellent corrosion resistance Regarding corrosion resistance, as austenitic stainless steel, it is the same general-purpose stainless steel as SUS304.
(B) It has a tensile strength comparable to that of piano wire. In the field of fine wire diameter, it has the characteristics of strength and elasticity comparable to that of piano wire B.
(C) High spring fatigue strengthCompared with stainless steel wire for springs in the past, spring design under high stress is possible, and the fatigue strength is excellent.
(D) Excellent resistance to residual strainThe residual shear strain (residual stress) is very small, and the dynamic elasticity is extremely excellent.
(E) Excellent heat resistanceCompared with piano wire, it has excellent heat resistance.
(f) The cost of low-cost material itself is slightly higher than that of piano wire, but if the total cost of rust prevention is included, it is cheaper. Especially below φ0.2mm, because the material cost is lower than that of piano wire, a substantial cost reduction can be achieved .