Release time：2020-01-16 18:44 Browse：
Material and performance analysis
8.8, this mark first tells us the mechanical properties of the bolt. In international standards, class 8.8 means that the tensile strength of the bolt is 800MPa and the yield strength is not less than 640MPa, which directly reflects its high strength and excellent load carrying capacity. And "carbon steel" as its main material, it gives the bolt good machinability, weldability and a certain toughness, so that the bolt can still maintain stable performance under complex stress environment.
Galvanized treatment is a key part of the surface protection of 8.8 grade carbon steel bolts. Through the hot dip galvanizing process, a uniform and dense zinc layer is formed on the surface of the bolt, which can not only effectively isolate air and moisture, prevent bolt rust corrosion, but also further protect the matrix from erosion when the bolt is slightly scratched by the way of "sacrificial anode", thus greatly extending the service life of the bolt.
Structure design and application scenarios
The design of "lengthened outer hexagonal" is carefully considered for specific application scenarios. The lengthened design allows the bolt to provide a more stable and reliable connection in the connection of thicker materials or where greater preload forces are required. The shape of the outer hexagonal, it is easy to use tools such as wrenches to tighten and disassemble, improve work efficiency and ease of operation.
In the construction field, 8.8 grade carbon steel galvanized lengthened outer hexagonal bolts are often used in the connection of key structures such as Bridges, steel structure workshops, high-rise buildings, and its high strength and excellent corrosion resistance ensure the safety and stability of buildings in harsh environments. In the machinery manufacturing industry, such bolts are an indispensable part of a variety of large mechanical equipment and transmission devices, and they are closely connected to each component to ensure that the machine can run efficiently and smoothly.
Production process and quality control
The high quality 8.8 grade carbon steel galvanized lengthened outer hexagonal bolts cannot be separated from the strict production process and quality control system. From the selection of raw materials, forging, heat treatment, machining to the final galvanized treatment, every link needs to go through precise control and strict testing.
For example, in the forging process, it is necessary to strictly control the heating temperature, forging ratio and cooling rate after forging to ensure that the structure of the bolt is uniform and dense, without cracks, slag inclusion and other defects. Heat treatment is a key step to improve the mechanical properties of the bolt, through quenching and tempering treatment, so that the bolt to obtain the required strength and toughness. The selection and control of galvanizing process is directly related to the corrosion resistance and service life of bolts.
In addition, the strict quality inspection system is also an important guarantee to ensure the quality of bolts. From the chemical composition analysis of raw materials, mechanical performance testing, to the appearance inspection, size measurement and performance sampling of finished products, every link needs to be strictly checked to ensure that every bolt delivered from the factory meets the standard requirements.
Environmental protection and sustainable development
With the global attention to environmental protection and sustainable development, the production of 8.8 grade carbon steel galvanized lengthened outer hexagonal bolts also pays more attention to environmental protection and rational use of resources. In the production process, the use of low energy consumption, low emissions of production equipment and processes to reduce the impact on the environment. At the same time, by optimizing the design and production process, the utilization rate of materials is improved and waste is reduced. In addition, the treatment of hazardous waste such as galvanized waste liquid is also carried out in strict accordance with environmental regulations to ensure that it does not cause secondary pollution to the environment.
