Fasteners, as the connection between the host and parts […]
Fasteners, as the connection between the host and parts, are tested in various harsh service environments along with the host. They are used in high temperature, high pressure, low temperature, vibration, corrosion, heavy load, alternating stress, shear and torsion resistance Various occasions. The failure and damage of fasteners have a very high probability of causing accidents or disasters, so the materials used to manufacture fasteners must be strictly selected.
For automotive fasteners, grade 8.8 non-standard screws use 35, 45, ML35 steel; grade 10.9 bolts use 35CrMo, 40Cr steel; grade 12.9 non-standard screws use 35CrMo, 42CrMo, SCM435 steel. Baosteel is the main material for automotive standard parts in China, which has a relatively high market share in the domestic market for special high-strength fasteners such as cars and commercial vehicle engines. Baosteel has become the designated manufacturer of special standard steel for FAW, Dongfeng, SAIC and other companies.
Imported materials for fasteners for class 10.9 and class 12.9 engines mainly come from companies such as Kobe, New 13 Railway, and Pohang. Imported materials have good hardenability, high purity, stable assembly, and the cost is about 15%-20% higher than that of domestic materials.
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