What are the treatment methods for blackening of high-strength bolts?

What are the treatment methods for blackening of high-strength bolts?

Its manufacturing process is different from ordinary bolts. In addition to basic processing techniques, there is also heat treatment. Mainly used for large hexagonal head bolts, also known as large hexagonal head bolts or steel structural bolts. High strength blackened bolts refer to bolts that have undergone blackening treatment and have a strength performance level of 8.8 or higher. So what is blackening treatment? Let's take a look.

1. In fact, at room temperature, the color of black materials is different from that of black materials.

2. Blackening refers to the process of pickling, degreasing, heating, and oxidation of the reaction surface to form a black or blue oxide film. The bolt size is accurate and cannot be replaced. Indoor use is frequent. The surface of high-strength blackened bolts produces an oxide layer, which usually does not deform due to low temperature during processing. Compared to chrome plating, it is certainly much cheaper, but its rust resistance and decorative properties are worse than chrome plating.

3. After metal isolation of air and rust prevention treatment, a layer of oxide film will be formed on the surface of high-strength bolts. If the appearance requirements are not high, blackening treatment can be used. The surface of the steel is blackened, also known as some blue. Blue treatment is a chemical surface treatment. Its main function is to form a dense oxide film on the surface of the workpiece, preventing corrosion and rusting. In order to improve the wear resistance of the workpiece, this is only surface treatment and will not have any impact on the internal structure. This is not heat treatment, it is fundamentally different from quenching.

The company's main products include high-strength bolts, high-strength nuts, steel structural bolts, steel structural nuts, grid sealing plates, grid bolts, etc.