Steel ball, also known as steel ball or ball, is a spherical steel component widely used in industry and daily life.

Based on their application fields and characteristics, steel balls can be primarily classified into the following categories:

Wear-resistant steel balls (grinding balls): Primarily used in crushing and grinding operations in industries such as mining, cement, power, and chemical, they achieve material crushing through collision and friction with the material. These steel balls require high wear resistance, and common materials include high chromium steel, low chromium steel, 65Mn, 42CrMo, etc. 12 Bearing steel balls: The core component of precision bearings, they are used to support and reduce friction of rotating parts. These steel balls have extremely high requirements for precision, roundness, and surface finish, commonly known as "steel balls" or "rolling balls". 1 Stainless steel balls: Made of stainless steel with a chromium content of ≥12.5%, the chromium oxide layer formed on the surface provides excellent resistance to atmospheric corrosion, water vapor, water, and acid-base-salt corrosion. According to alloy composition and performance, they are mainly divided into: Austenitic types: Such as 304, 304HC, 316, 316L, which are non-magnetic or weakly magnetic, with excellent rust and corrosion resistance, commonly used in medical equipment, food machinery, chemical industry, aviation, and other fields. 3 Martensitic types: Such as 420, 440C, which are magnetic, with high hardness (HRC up to 58 or more), good wear resistance, suitable for high-precision bearings, valves, petroleum machinery, etc. 3 Other types: Such as 201, 302, etc., also belong to the austenitic type, with different performance and cost characteristics, suitable for general hardware accessories, household appliances, etc. 3 Micro steel balls: Specifically designed for micro bearings, their roundness, surface roughness, and other precision indicators directly affect the performance of the bearing. The nominal diameter is usually between 0.5mm and 12.7mm, with core specifications concentrated between 0.8mm and 2.381mm, and precision grades up to G3, G5, G10