Solutions for high-strength joint bolts and nuts for rails

High-strength bolts: High-strength bolts are made of high-strength steel or need larger preload bolts to be applied. They can be called high-strength bolts. High-strength bolts are used in bridges, rails, and high-pressure and ultra-high-pressure equipment connections. The fracture of this bolt is mostly brittle. High-strength bolts are used in ultra-high-pressure equipment to ensure the sealing of the container. There is a need to apply a large pre-stress. High-strength bolts are manufactured using high-strength materials. High-strength bolts, screws, nuts, and washers are made of high-strength steel, commonly used 45 steel, 40 boron steel, 20 manganese titanium boron steel, 35CrMoA, and so on. Ordinary bolts commonly used Q235 (equivalent to the past A3) steel manufacturing. High-strength bolts are used in an increasingly wide range from the strength level. Commonly used 8.8s and 10.9s are two strength levels, of which 10.9 is predominant: ordinary bolt strength grade to be low, Generally 4.4, 4.8, 5.6, and 8.8. High-strength bolts work under high strength and high resistance, so they must have high strength, good toughness, corrosion resistance, wear resistance, and other properties. The material for the performance of high-strength bolts has a critical impact; the choice of the suitable material ensures the everyday work of high-strength bolts. The next by Nanjing Ning is for you to introduce the application characteristics of high-strength bolts.

High-strength nut connection has the advantages of simple construction, good stress performance, removable, fatigue resistance, under the action of dynamic loads do not loosen, etc. and is an up-and-coming connection method.

High-strength nuts: A high-strength nut is a special wrench that tightens the nut so that the bolt produces a vast and controlled pre-tension through the nut and pad; the pre-pressure also makes the exact size of the connection. Under pre-pressure, greater friction will be created along the surface of the connected parts. As long as the axial force is less than this friction, the components will not slip, and the connection will not be damaged; this is the principle of high-strength nut connection.  

A high-strength nut connection relies on the friction between the contact surfaces of the connectors to prevent their mutual slippage. To make the contact surfaces have enough friction, it is necessary to improve the clamping force of the components and increase the friction coefficient of the contact surface of the elements. The clamping force between the components is based on the pre-tension applied to the bolt to achieve, so the bolt must be manufactured using high-strength steel, which is also known as high-strength bolts connected to the reason.  

High-strength joint bolts and nuts for rails are special bolts and nuts used to connect high-strength and durability rails. Rail is an integral part of the railroad, subway, and other rail transportation systems; the stability and safety of its connection parts are directly related to the operation of the entire transportation system. Therefore, high-strength joint bolts and nuts are pivotal in rail transportation.

Characteristics of high-strength bolts

1. High strength: The material and hardness requirements of high-strength bolts, as well as their tensile strength, are usually more than 800MPa, much higher than the strength of ordinary bolts, and can withstand greater loads.

2. Strong anti-loosening ability: the nut of the high-strength bolt adopts a particular self-locking structure, which can effectively prevent loosening and vibration and improve the stability and safety of mechanical equipment.

3. High reliability: High-strength bolts are produced strictly; after several procedures, the quality is reliable, and it is challenging to solve quality problems.

4. Strong adaptability: High-strength bolts are usually used in machinery manufacturing, bridge construction, high-speed railroads, automobiles, and other fields and have a wide range of applications in various fields.

High Strength Characteristics of Structural Steel Nuts

The high-strength properties of structural steel nuts come from the high-strength steel used. This steel is specially heat-treated and processed to provide extreme strength and durability to support large amounts of tensile and shear forces.

Structural steel nuts are usually categorized into average grade and high strength grade. Regular-grade structural steel nuts generally withstand low to moderate tensile and shear forces, while high-strength grade nuts can withstand higher strength requirements. For example, 8.8-grade high-strength structural steel nuts can withstand loads up to 120KN, while 10.9-grade nuts can withstand even higher loads.

Features of high-strength joint bolts and nuts

1. High strength: High-strength joint bolts and nuts have high tensile strength and shear strength and can withstand the enormous stress generated by the rail connection part.

2. Durability: High-strength joint bolts and nuts have good corrosion resistance in the outdoor environment to ensure that the long-term use of the phenomenon does not appear loose, rusty, or corrosion.

3. Stability: High-strength joint bolts and nuts have high stability in the connection part, which can effectively prevent the displacement and deformation of the rail connection part.

Application of high-strength joint Applicationnuts

High-strength joint bolts and nuts for steel rails are widely used in railroad, subway, light rail, and other rail transportation systems as rail connection parts to ensure the safe and stable operation of rail transportation systems. Steel structure nuts are also widely used in steel structures, such as high-rise buildings, large bridges, power projects, etc. They connect components and parts, ensuring steel structures' stability, safety, and durability.

1. High-speed railroad: The bolts in high-speed railroads need to withstand the considerable load and vibration of high-speed trains in motion, and the characteristics of high-strength bolts can well meet this demand.

2. Automobile: High-strength bolts are usually used to connect the engine wheels and other essential parts, ensuring the car's stability and safety.

3. Bridge construction: bridge construction requires a large number of high-strength bolts to ensure the firmness and durability of the bridge.

4. Machinery manufacturing: the application of high-strength bolts. The application manufacturing industry is pervasive and can be used to connect extensive machine tools, metallurgical equipment, and wind power generation equipment.

Installation and maintenance of high-strength joint bolts and nuts

1. Installation: When installing high-strength joint bolts and nuts, it is necessary first to use temporary bolts and punching nails for positioning to ensure the accuracy of the connection part. Then, the high-strength joint bolts and nuts are installed according to the design requirements.

2. Maintenance: To ensure the stability and safety of the connection parts of the high-strength joint bolts and nuts, it is necessary to carry out regular inspections and maintenance. It mainly includes cleaning, lubrication, fastening, and other links.

High-strength joint bolts and nuts for rails are of great significance in rail transportation, and their high strength, durability, and stability provide a strong guarantee for the safe operation of the rail transportation system.

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