Qin steel wire is a high carbon steel material. It is a high-strength carbon steel spring material that is quenched in a lead bath and then cold drawn, usually appearing in the form of circular wires. Qin steel wire has high tensile strength, elastic limit, and fatigue resistance, making it an ideal material for making springs. The standard wire diameter range is 0.05 to 10.0 millimeters, and for wire diameters below 1.0 millimeter, the strength of qin steel wire is between 2000 and 3480 megapascals. Most specifications of piano wire cannot be replaced by other materials and is mainly used to make dynamic load springs, especially in the application of valve springs. In addition, piano wire is also used to make various advanced spring material products, such as valve springs for engines, various instrument strings, weapon springs, and prestressed steel strands. The quality and performance requirements of piano wire are very strict to ensure its high quality and reliability.
manufacturing technology
4.1 Surface preparation of wire rod
The commonly used pickling and phosphating technology before drawing is to apply a phosphating film suitable for drawing on top.
4.2 Drawing semi-finished products
Both dry drawing and wet drawing techniques can be used for drawing steel wire, and lubrication, mold, and cooling should be controlled well.
4.3 Solzhenization heat treatment
The commonly used lead bath quenching heat treatment requires two heat treatments for fine specifications, followed by online acid pickling and phosphating.
4.4 Finished product drawing
The finished product drawing technology is similar to the description "4.2" above, but attention should be paid to controlling the drawing temperature and the shape of the steel wire "coil".
4.5 Oil coating packaging
Finished steel wire needs to be packaged and delivered with oil coating, or it can be delivered without oil coating.
4.6 Special processes
Special processing techniques such as hot-dip galvanizing before finished product drawing, nickel plating after finished product drawing, cold rolling into irregular shapes, and using special stainless steel instead of carbon steel.
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