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AISI440/440C
The microstructure is martensitic, and the manufacturing process is demanding. Few domestic manufacturers are capable of producing stainless steel 440C, which is why companies that do so are often regarded as specialists in this material. The heat‑treatment process is complex, prone to cracking, and requires high precision. As a result, 440C is one of the hardest stainless‑steel ball grades, with a Rockwell hardness (HRC) of ≥58. Its hardness is comparable to that of bearing steel balls, yet it offers superior resistance to rust and corrosion.
