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What are the solutions for high-strength blackened bolts? Its manufacturing process is different from ordinary bolts. In addition to basic processing, there is also conditioning and tempering. The main ones used are large hexagonal bolts and steel frame bolts. High-strength blackened bolts refer to bolts that have been blackened and have a strength level above 8.8. So what is blackening? Let’s take a look below. 1. In fact, blackening is another way to indicate acidity. It is generally used at room temperature and is mainly composed of selenium-containing substances. After treatment, depending on the materials and processes, the result will be black or blue-black, so it is famous. 2. Blackening refers to pickling, degreasing, heating and oxidizing the reaction surface to form a black or blue oxide film. The exact size of the bolt cannot be replaced. High-strength blackened bolts form an oxide layer on the surface. Due to the low temperature during production and processing, they are generally not easy to deform. It is of course much cheaper than chrome plating, but the rust resistance is a little worse than chrome plating. 3. High-strength blackened bolts will form an oxide film on the surface after using metal to block air and achieve the effect of preventing rust. If the appearance requirements are not high, blackening can be used. Deep blue solution is an organic chemical surface solution. The key function is to produce a high-density oxide film on the surface of steel parts to avoid corrosion and rust. Improve wear resistance, this is just a surface treatment and will not have any impact on the internal structure.