What is the use for spring steel that take advantage of its unique properties?
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The primary use is for springs. It can be deflected to a large extent by applying a force it will return to its original shape when the force is removed. The force/displacement relationship tends to be a constant. A lesser use is to use spring steel wire as a vibrating string on a stringed instrument.
*Spring steel is a low alloy, medium carbon steel with a very high yield strength. This allows objects made of spring steel to return to their original shape despite significant bending or twisting. Silicon is the key component to most spring steel alloys. An example of a spring steel used for cars would be AISI 9255 (DIN and UNI: 55Si7, AFNOR 55S7), containing 1.50%-1.80% silicon, 0.70%-1.00% manganese and 0.52%-0.60% carbon. Most spring steels (as used in cars) are hardened and tempered to about 45 Rockwell C. the most widely used spring steel is ASTM A228 (0.80–0.95% carbon), which is also known as music wire. Spring steel is one of the most popular materials used in the fabrication of lock picks due to its pliability and resilience.
