The spring steel wire should have a high elastic limit, yield strength and tensile strength. Because spring is usually used in its elastic range, it should back into its original position after unload, and we hope the plasticity deformation is as small as possible. The yield strength of spring steel wire is higher; the elastic limit is closer to tensile strength. So if we can improve the wire's strength utilization rate, the spring's elasticity is stronger. What's more, spring usually use under the action of alternating stress, so the spring steel wire need to have a high fatigue limit, and good resistance to creep and relaxation.
There are other requirements to the spring steel wire if the spring is used in a specific environment. Such as: the spring steel wire must have good corrosion resistance in the corrosion environment. Precision instruments used in the spring, the wire should have long-term stability and sensitivity, and the temperature coefficient of the spring steel wire is lower, the quality factor is higher, the elastic modulus should be constant. Working under high temperature conditions, the wire should remain elastic limit and good creep properties.
What’s more, the consideration should be given to spring steel wire forming process and heat treatment process. Different spring through the different process has its own feature.
When you are choosing the aluminum ladder, you should consider more about the features.