Spring steel
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Spring steel is a low alloy, medium to high carbon kind of steel. This alloy is used in springs because it does not easily lose its form.
According to Machinery's Handbook, “The spring materials most commonly used include high-carbon spring steels, alloy spring steels, stainless spring steels, copper-base spring alloys, and nickel-base spring alloys.” According to the same, the most widely used spring steel is ASTM A228 (0.80–0.95% carbon) known as “music wire”.