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Fastener Good Cold Heading Performance
Sep 27, 2017

Automotive fastener steel requirements:

Has a good surface quality, Fastener high-level dimensional accuracy and low-grade non-metallic inclusions and segregation;

Has a high tensile strength and good cold heading performance;

Has a high fatigue resistance and multiple impact tensile resistance;

Has a sufficiently low delayed fracture sensitivity and a lower toughness - brittle transition temperature.

The use of furnace refining and electromagnetic mixing with the casting process. Mainly in the steel in the C, Si, Mn, Cr, Mo and other major elements of the control in a small range, Fastener and as much as possible to reduce the steel P, S, 0, N and other impurities, to achieve high purity steel, Non-metallic inclusions are low and the segregation level is low, thereby improving the cold heading performance of the steel and improving the surface quality of the steel.

A high-speed, high-precision rolling process with controlled dairy and controlled cooling is used to obtain hot-rolled wire rods with good dimensional accuracy and as little surface defects as possible. In the case of

From the steel to improve the cold heading, Fastener improve the steel in terms of the need to minimize the content of impurities in steel impurities. Reducing the content of S can improve the deformation ability of steel and reduce the non-metallic inclusions in steel, improve the toughness; reduce the P content can reduce the deformation resistance of steel, while reducing the P, Fastener S content can also reduce its grain boundary Reduce the grain boundary embrittlement, and can improve the resistance of steel to delay the fracture performance; Fastener reduce the steel 0 content, can effectively reduce the oxide inclusions, Fastener thereby improving the cold deformation of steel capacity. In the case of

The KISCC of steel with high cleanliness has a much higher quality than that of commercial steel. Therefore, in order to ensure that the steel is still strengthened after high strength, the strength of the stress corrosion factor KISCC of ML42CrMo steel with high cleanliness is studied. With a high overall performance, Fastener high strength bolts steel P, S content to be further reduced.

The use of micro-alloy non-quenched and tempered steel manufacturing bolts can be omitted before the cold-drawn bolts bolts and bolts after forming the quenching and tempering treatment, Fastener but also reduce the deduction of screw thread deduction, improve the yield of bolts, economic benefits are obvious The





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