What are the main materials of Dongguan screws?
Screws are a kind of parts that are very commonly used, and they have penetrated into many fields such as machinery, chemical industry, petroleum and so on. The development of Dongguan screws has also led to the prosperity of raw materials, so what are the main common screw materials? What are their characteristics?
First, Iron
There are more screws made of iron on the market, which are very cheap and relatively rough in processing. But we all know that iron has one of the biggest flaws that is relatively easy to rust in the air, once rusted, the connection performance of the iron screw will be greatly reduced. Therefore, in the instrument industry, if iron screws are used, in addition to higher processing accuracy requirements, they also need to be compared and processed. Common treatment methods are mainly blackening and galvanizing. Regardless of the treatment method, it is to block the contact between the screw and the air, so as to prevent it from rusting. Of course, after these surface treatments, the price of screws will also increase a lot. Under normal circumstances, the price of screws with the same specifications and blackened iron is similar to that of 304. Therefore, in some cases, the price of Dongguan screws cannot be judged only by the material of Dongguan screws.
Second, Carbon steel
Carbon steel is also very common. In the material market, carbon steel is not only one type. There are four types of low carbon steel, medium carbon steel, high carbon steel and alloy steel. This classification is mainly based on carbon steel. In terms of carbon content. As far as carbon steel screws are concerned, high-carbon steel screws are rare, and medium-carbon steel screws are the most frequently used.
Third, Stainless steel screws
Stainless steel materials are also divided into many types, one is austenite, which has higher heat resistance and corrosion resistance; the other is martensite, which has better corrosion resistance than martensite Austenite is much worse, but it also has many advantages, such as its very good wear resistance.
Fourth, Brass
Brass is also used to process Dongguan screws. Because the price of brass is significantly higher than that of carbon steel and stainless steel, copper screws are generally more expensive.