Hot-dip galvanized bolts
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4.8 grade 8.8 grade hot-dip galvanized outer hexagon bolt power bolt hot-dip coating
Hot dip galvanized bolts, also known as hot-dip galvanized bolts, are rust proof and corrosion-resistant fasteners produced through heated galvanizing treatment. They are widely used in industrial infrastructure construction and power accessories.
Hot dip galvanizing: Hot dip galvanizing is the process of reacting molten metal with an iron substrate to form an alloy layer, thereby combining the substrate and coating. Hot dip galvanizing is the process of first pickling steel parts to remove iron oxide from the surface. After pickling, it is cleaned in a solution of ammonium chloride or zinc chloride, or a mixture of ammonium chloride and zinc chloride, and then sent to the hot-dip galvanizing tank. Hot dip galvanizing has advantages such as uniform coating, strong adhesion, and long service life.
There are many types of hot-dip galvanized carriage bolts, which are generally selected according to the usage environment. The commonly used materials are as follows:
1. Carbon steel: generally used in general machinery and equipment, with low strength but cheap price and easy processing.
2. Alloy steel: With higher strength than carbon steel, it is suitable for places that can withstand larger loads, such as large machinery and steel structures.
3. Stainless steel: suitable for high-temperature and high-pressure environments, such as chemical, petroleum, natural gas and other industries, but its price is relatively high.
4. Brass: It is a commonly used material with good conductivity, suitable for special occasions such as electric towers.
The galvanized layer of hot-dip galvanized bolts is relatively thick, generally 30-60 microns. The zinc layer has high rust and corrosion resistance, making it suitable for outdoor work such as high-speed guardrails and power towers. In addition, hot-dip galvanized bolts are becoming the preferred choice for power towers, signal towers, and highway guardrails due to their high strength and corrosion resistance.
Hot dip galvanizing is one of the most effective methods to delay environmental corrosion of steel materials. It involves immersing cleaned and activated steel products in molten zinc solution, and coating the surface of steel products with a zinc alloy coating with good adhesion through the reaction and diffusion between iron and zinc. Compared with other metal protection methods, the hot-dip galvanizing process has unparalleled advantages in the combination of physical barrier and electrochemical protection of the coating, the bonding strength between the coating and the substrate, the density, durability, maintenance free and economic properties of the coating, and its adaptability to the shape and size of the product. At present, hot-dip galvanized products mainly include steel plates, steel strips, steel wires, steel pipes, etc., among which hot-dip galvanized steel plates account for the largest proportion. For a long time, the hot-dip galvanizing process has been favored by people due to its low plating cost, excellent protective characteristics, and beautiful appearance. It is widely used in fields such as automobiles, construction, home appliances, chemicals, machinery, petroleum, metallurgy, light industry, transportation, electricity, aviation, and marine engineering.
