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Why does the stainless steel ball rust, and what is the cause of the rust?


First of all, we must know what a stainless steel ball […]

First of all, we must know what a stainless steel ball is. The definition of stainless steel ball: a steel ball that contains more than 12.5% ​​chromium and is highly resistant to chemical substances (acid, alkali, salt).

Why do stainless steel balls rust?

1) When brown rust spots appear on the surface of the stainless steel ball, the stainless steel does not rust. The rust is not stainless steel. It is surprising that there may be problems with the steel. In fact, this is a one-sided erroneous view of the lack of understanding of stainless steel. Stainless steel can also rust under certain conditions.

2) Why is stainless steel magnetic?

3) People often think that magnets adsorb stainless steel materials to verify its quality and authenticity. If magnets are not adsorbed, they are considered good, and the real attractors of goods are considered to be fake. In fact, this is an extremely one-sided and uncertain method of error identification.

There are many kinds of Stainless Steel Ball, and they are divided into several categories according to the organization structure at room temperature.

1) Austenitic steel, which typically represents 201, 202, 302, 304, 304HC, 304L, 316, 316L. This stainless steel contains nickel and has strong rust and corrosion resistance. This stainless steel is non-magnetic, but it produces Magnetism, heat treatment can remove the magnetism.

2) Martensitic steel or ferritic, this is generally 4 series stainless steel, 410, 420, 430, 420C, 440, 440C and other stainless steels only contain chromium, no nickel, rust and corrosion resistance is not as good as austenitic steel ball. This kind of stainless steel ball cannot be demagnetized, but the martensitic steel has unique advantages: heat treatment can increase the hardness, is suitable for finishing, and has strong wear resistance.

Stainless steel has the ability to resist atmospheric oxidation, that is, it is not rusty, and it also has the ability to corrode media containing acids, alkalis and salts. However, the size of its corrosion resistance varies with the chemical composition, interaction state, use conditions and environmental media types of the steel itself.