Surface treatment of stainless steel screws and characteristics of self-tapping screws
Under normal circumstances, the surface of stainless steel screws is usually smooth and does not require special surface treatment. However, some customers will request specific surface treatments, which can not only meet their engineering needs, but also improve certain properties of stainless steel screws and increase their aesthetics. So how much do you know about the surface treatment of stainless steel screws?
1. Electroplating: Soak the parts in an aqueous solution containing metal compounds, and deposit metal on the surface of the parts through electric current. Common electroplating includes zinc plating, copper plating, nickel plating, chromium plating, copper-nickel alloy plating, etc.
2. Hot-dip galvanizing: Immerse carbon steel parts into molten zinc liquid with a temperature of about 510°C, so that a passivation layer in which the iron-zinc alloy transforms into zinc is formed on the surface. A similar process is hot-dip aluminizing.
3. Mechanical plating: A coating is formed on the surface of the product by spraying metal particles, and the coating is fixed on the surface of the product through cold welding. Usually electroplating is used for screws, but for hex wood screws etc. used outdoors, hot dip galvanizing is usually used. The cost of electroplating is generally 0.6-0.8 yuan per kilogram, and the cost of hot-dip galvanizing is generally 1.5-2 yuan per kilogram, which is higher.
Among those who are interested in screws, many may have some knowledge of self-tapping screws. However, we cannot become complacent because of this. Everyone's understanding of screws may be different. If we can share information about self-tapping screws, screw manufacturers can get more innovative ideas and produce higher-quality products, benefiting everyone and making our lives more diverse.
Therefore, many screw manufacturers will conduct a systematic summary of the screw market. We will find that self-tapping screws can actually be divided into several types, including thread forming, thread cutting, thread rolling and self-drilling.
First, let's talk about thread forming self-tapping screws. This kind of screw is developed from sheet metal. When using it, we need to pre-drill the hole and then screw the screw into the hole to form a match between the internal and external threads. This is how thread forming self-tapping screws work.
Self-tapping screws have a wide range of applications. If you can master this technology proficiently, I believe you will be able to make many mechanical products with ease. This is also a very learned technique. You need to do more research. This process may be tiring, but don't be afraid of sweating or hard work. When you truly master this technology, you will feel prouder than ever before.
