An excellent spring steel wire can make a great spring; just like each and every product with great high quality normally has decent supplies. So you must know methods to choose the spring steel wire. Here are 3 selection principle of spring: 1st, the spring steel wire ought to meet the functional requirements, then ought to meet the strength, and finally look at the economy. Spring created by distinctive spring steel wire has diverse performance. We could understand clearly with carbon spring steel wires and alloy spring steel wires.
Carbon spring steel wire is widely employed in steel spring, also will be the largest amount of steel classes. Steel contains 0.60% to 0.90% carbon and 0.3% to 1.20% manganese, not to add other alloying elements, the cost of carbon spring steel wire is somewhat low. Carbon spring steel wire immediately after appropriate processing or heat treatment, can attain high tensile strength, adequate toughness and good fatigue life. Nevertheless, the carbon steel wire has poor relaxation properties and poor corrosion resistance performance, the temperature coefficient of elastic modulus is large (up to 300×10-6 / ℃). So the carbon spring steel wire typically used for the spring of manufacture of modest cross section, the working temperature is low (＜120℃).
The alloy spring steel wire usually contains 0.70% ~ 0.45% carbons and contains a specific quantity of Si, Mn, Cr, V, W and B along with other alloying elements. The addition of alloying elements improves the relaxation resistance performance of spring steel wire, increases the toughness of steel, and though significantly improves the use of temperature. So alloy spring steel wire is employed for the spring of large cross section and use under high temperature.
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