Basic definition of stainless steel ball and pitting prevention measures

- Jun 29, 2018-

Stainless steel balls are generally made using forging processes. For now, the more common materials are 201, 302, 304, 316, 316L, 420, 440C. Usually stainless steel balls are made of steel that contains more than 12% chromium and is resistant to chemical attack.


In fact, the stainless steel ball does not completely mean that it will not rust, but it is not easy to rust. The rust prevention principle is that with the addition of chromium, a dense layer of dense chromium oxide is formed on the surface of the steel, which can effectively block the re-contact between the steel and the air, so that the oxygen in the air cannot enter the steel and reach The effect of preventing steel rust.


In order to avoid pitting corrosion of stainless steel balls, some precautions can be taken: for example, in the environment where pitting corrosion is known to be appropriate, the appropriate stainless steel material is selected. Experiments indicate that the content of Mo or Mn is higher. Stainless steel is more resistant to pitting corrosion.


At the same time during application, attention should be paid to controlling the pH, chloride concentration, and temperature of the liquid in contact with stainless steel balls. In addition, it is recommended to use a better quality stainless steel, such as 316 or 316L, to improve the resistance to pitting corrosion of stainless steel balls.