What are the methods to deal with blackening of hexagon socket bolts? The processing technology of hexagon socket bolts is different from that of ordinary bolts. In addition to substrate processing technology, it is also suitable for large hexagonal heads, steel frame structures, etc. Blackening treatment refers to using a specific treatment method to produce a black surface oxide film on the hexagon socket bolts to improve its compressive strength. It is usually suitable for bolts above grade 8.8.
In fact, at normal temperature, the colors of black raw materials and black materials are different. Black oxide film refers to the black or blue oxide film formed on the surface through processes such as pickling, degreasing, heating and oxidation. This processing method is suitable for indoor use with high precision requirements and non-replaceable parts.
Compared with stainless steel, the metal with blackened surface on the hexagon socket bolt belongs to ferrous metal, and the processing temperature is not high, so it is generally not easy to deform. Compared with stainless steel, its cost is cheaper. However, its rust-proof performance and decorative effect are not comparable to that of stainless steel. When metal materials are selected to block air, an oxide film will form on the surface of the hexagon socket bolts after anti-rust treatment. If the appearance requirements are not high, you can choose black treatment.
The surface of the hexagon socket bolts is blackened, also known as a slight blue treatment. Blue treatment is a chemical surface treatment method whose main function is to generate a dense oxide film on the metal surface to prevent the metal from rusting and improve wear resistance. This treatment method only targets the surface and will not affect the internal structure, unlike alloy treatment methods such as quenching.
As we all know, all screws have a grade, which is determined by the tensile strength and shear strength of the screw. The breakage of stainless steel screws may be caused by the tensile or shear force exceeding the ultimate strength of the stainless steel screws, unless there is a problem with the screws themselves.
Stainless steel screws usually refer to steel screws that can resist corrosion from air, water, acid, alkali salts or other media. Depending on the alloy composition, stainless steel screws can be focused on rust resistance or acid resistance. Although some steels are stainless, they are not necessarily acid-resistant, and acid-resistant steel is usually stainless. The reasons for the breakage of stainless steel screws can be the following:
Screw quality issues.
