what are types of stainless stee screw and its appliciation?

Stainless steel screw manufacturers share for you: stainless steel screws usually refer to screws that are resistant to corrosion by air, water, acid, alkali salt or other media. Stainless steel screws are generally not easy to rust and are durable, and can be used in environmental protection equipment, medical equipment, communication equipment and other fields.
People often think that magnets absorb stainless steel materials to verify their quality and authenticity. If they are not attractive and non-magnetic. They are considered to be good and ture stainless steel; if they are magnetic, they are considered to be counterfeit products. In fact, this is an extremely one-sided and impractical method of identifying errors. There are many types of stainless steel screws. Stainless steel screw manufacturers can be divided into several categories according to their organizational structure at room temperature:
Austenite type: such as 304, 321, 316, 310, etc.;
Martensite or ferrite type: such as 430, 420, 410, etc.;
Austenite type is non-magnetic or weakly magnetic, martensite or ferrite is magnetic

The stainless steel usually used as decorative material is mostly austenitic 304 material. Generally speaking, it is non-magnetic or weak magnetic. However, due to chemical composition fluctuations or different processing conditions caused by smelting, magnetism may also appear, but this cannot be considered as What is the reason for counterfeit or unqualified?

As mentioned above, austenite is non-magnetic or weakly magnetic, while martensite or ferrite is magnetic. Due to component segregation or improper heat treatment during smelting, a small amount of martensite or ferrite in austenitic 304 stainless steel will be caused. Body tissue. In this way, 304 stainless steel will have weak magnetic properties.
In addition, after 304 stainless steel is cold worked, the structure will also be transformed into martensite. The greater the degree of cold working deformation, the more martensite transformation and the greater the magnetic properties of the steel. Like a batch of steel belts, Φ76 pipes are produced without obvious magnetic induction, and Φ9.5 pipes are produced. Because the bending deformation is larger, the magnetic induction is more obvious. The deformation of the square rectangular tube is larger than that of the round tube, especially the corner part, the deformation is more intense and the magnetism is more obvious.

In order to completely eliminate the magnetic properties of 304 steel caused by the above-mentioned reasons, high-temperature solution treatment can be used to restore and stabilize the austenite structure, thereby eliminating the magnetic properties.
As a stainless steel screw manufacturers,we have to point out is that the magnetism of 304 stainless steel caused by the above reasons is not at the same level as other materials of stainless steel, such as 430 and carbon steel. That is to say, the magnetism of 304 steel is always weak. magnetic.
This tells us that if stainless steel is weakly magnetic or not magnetic at all, it should be judged as 304 or 316 material; if it is the same as carbon steel, it shows strong magnetism, because it is judged as not 304 material.

Application areas: stainless steel screws are widely used in machinery, petrochemical, communications, chemical, construction, power, textile, sports equipment, papermaking, sewage treatment, ships, automobiles and other industries. With the domestic economic and living standards greatly improving the application of stainless steel screws The scope will be wider.

Stainless steel generally refers to steel that has the ability to resist corrosion by air, water, acid, alkali salt or other media. According to the different alloy components, the focus is on rust resistance and acid resistance. Although some steels are rust-proof, they are not necessarily acid-resistant, and acid-resistant steels are usually rust-proof. Austenitic stainless steel is mainly used to produce fasteners. In people's daily life, the stainless steel that is often referred to is also austenitic stainless steel. The stainless steel fasteners we use mainly use austenitic 302, 304, 316 and "low nickel" 201 as raw materials.

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