The toughness and tensile strength of the piano steel wire is obviously better than that of the carbon steel wire, and it can improve the service life of the product more than the carbon steel wire. Therefore, many high-tech products choose to use piano steel wire.

Piano wire: suitable for making various pressure, tension and torsion springs, suitable for rolling various types of springs, automobile engine valve springs, precision instruments, electrical equipment, production machinery, brake springs, clutch springs, refrigerator compressor springs, etc. The carbon content of low-carbon steel with dynamic load is less than 0.25%

The carbon content of medium carbon steel is between 0.25% and 0.6%

The carbon content of high carbon steel is greater than 0.6%

After proper heat treatment or cold drawing hardening, high carbon steel has high strength and hardness, high elastic limit and fatigue limit (especially notch fatigue limit). The cutting performance is acceptable, but the welding performance and cold plastic deformation ability are poor. Due to the high carbon content, cracks are prone to occur during water quenching, so double-liquid quenching (water quenching and oil cooling) is often used, and oil quenching is mostly used for small cross-section parts. This kind of steel is generally used in the state of tempering or normalizing at medium temperature or surface quenching after quenching. Mainly used to manufacture springs and wear-resistant parts. Carbon I tool steel is a high-carbon steel that basically does not add alloying elements. It is also a steel grade with low cost, good cold and hot workability, and a wide range of use among tool steels. Its carbon content is 0.65--1.35%, and it is specially used to make tool steel. The density of high carbon steel is 7.81g/cm3. Can be used for the production of fishing gear.