Spring steel

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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.^{[citation needed]}

The most widely used spring steel is ASTM A228 (0.80–0.95% carbon), which is also known as music wire.^[1] Spring steel is one of the most popular materials used in the fabrication of lockpicks due to its pliability and resilience.

Nepalese

The Gurkha kukri are famous for the use of spring steel: apparently the best are forged from the leaf springs of old Mercedes trucks.

See also

• Martensite

References

Notes

Bibliography

• Oberg, Erik; Franklin D. Jones, Holbrook L. Horton, and Henry H. Ryffel (2000). Christopher J. McCauley, Riccardo Heald, and Muhammed Iqbal Hussain. ed. Machinery's Handbook (26th edition ed.). New York: Industrial Press Inc. ISBN 0-8311-2635-3. 

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