Classification and Introduction of High Strength Bolts
Classification and Introduction of High Strength Bolts
What is a high-strength bolt?
Bolts made of high-strength steel or requiring significant preload can be referred to as high-strength bolts.
High strength bolts are commonly used for connecting bridges, steel rails, high-voltage and ultra-high voltage equipment. The fracture of this type of bolt is mostly brittle. High strength bolts applied to ultra-high pressure equipment require significant prestressing to ensure the sealing of the container.
The difference between high-strength bolts and ordinary bolts:
High strength bolts can withstand a greater load than ordinary bolts of the same specification.
The material of ordinary bolts is Q235 (i.e. A3) manufactured. The material of high-strength bolts is 35 # or other high-quality materials, which undergo heat treatment after production to improve strength.
The difference between the two is the strength of the material.
Classification of high-strength bolts:
Friction type high-strength bolts: suitable for connecting steel frame beams and columns, solid web beam connections, heavy-duty crane beam connections in industrial buildings, brake systems, and important structures that bear dynamic loads.
Pressure bearing high-strength bolts: can be used for shear connections in static load structures that allow for a small amount of sliding or components that indirectly bear dynamic loads.
Tensile high-strength bolts: When the bolt is in tension, its fatigue strength is relatively low. Under dynamic load, its load-bearing capacity is not easy to exceed 0.6P (P is the allowable axial force of the bolt). Therefore, it is only suitable for use under static load, such as flange docking of compression members, T-joints, etc.
