Intensity level and the use of steel automotive fasteners
发布时间:2016-05-25
Bolt scale automobile plant utilization is 8.8 bolts, mostly boron steel products. Boron steel bolts Price low boron content is rarely the reason, it is possible to make the steel low carbon equivalent, ball annealing can be omitted prior to processing. 10.9 alloy steel and boron steel bolt is finished with 8.8 boron steel bolts are divergences, the low P, S as a result of delayed fracture harmless element content, and the use of phosphorus-free lubricating coating infiltration in the drawing. 12.9 Automotive bolts are steel products, automobile bolt 14.9 is a special alloy steel products, steel low impurity content, and add V carbide precipitation and other elements trapped hydrogen in the steel to improve the anti-delayed fracture properties. Automobile mass production utilizing the highest intensity level is 16T bolt Further, the material of the wire drawing is a eutectoid steel, vanadium carbide steel hydrogen trapping, so that harmful of fastening bolts to further improve the power, therefore, can also be used to produce ultra high strength bolts 16.9.