Common wire rods used for fasteners are cold rolled steel wires. In addition, the fastener wire is also made of carbon steel, stainless steel, and high temperature. Alloy steel, aluminum-magnesium alloy, Monel alloy, etc. Steel cold-rolled steel wire rods are generally low-carbon and medium-carbon high-quality carbon structural steels and low-alloy steels. Low carbon cold heading steel is mainly used for cold heading nuts. The material of bolts and screws is mainly medium carbon steel ( ML35 and SWRCH35K ), which can reach level 8 and above after quenching and tempering . Cold heading is formed by metal plasticity at room temperature. Cold heading performance is one of the important characteristics of cold heading steel. Its performance is mainly manifested in good cold formability ; it has minimal resistance to deformation and possible high deformation capacity. Cold heading steel has good cold forming properties and is processed in industry. Use cold rolling instead of hot rolled material cutting machine. The advantage of this process is that while saving a lot of man-hours, metal consumption can be reduced by 10 % -30 %, which is in line with clean production and mass production by resource-saving enterprises. The product has high dimensional accuracy, high surface finish, and high production efficiency. The key processing technology of advanced machines. Therefore, using the cold heading process to manufacture fasteners is not only effective, but also of good quality, and the material cost is low and the cost is low.
