Steel Balls Manufacturer introduces that steel balls can be divided into high hardness balls and softballs according to their hardness; according to their anti-rust ability, they can be divided into stainless steel balls and non-rust-proof steel balls.
Bearing steel balls do not have the ability to prevent rust due to the material itself. Therefore, a certain amount of anti-rust oil must be added to the general inventory and packaging; the hardness of the bearing steel balls is in accordance with the requirements of the latest national standard GB/T308.1-2002. It is HRC58-66; the hardness will vary depending on the size. Over -30, the hardness is generally HRC61-66; over 30-50mm, the hardness range is about HRC58-64.
Steel ball hardness, in the industry's testing methods, is generally the hardness of mechanical equipment, the core hardness, and the surface hardness. Bearing steel balls are relatively hard spheres and are used in high-precision equipment, so the core hardness is similar to the surface hardness.