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440/440C stainless steel ball
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.
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Detailed Introduction
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 hardness of HRC ≥ 58. Its hardness is comparable to that of bearing steel balls, yet it offers superior resistance to rust and corrosion.
Comparison: Compared with 440 stainless steel balls, it offers superior rust and corrosion resistance, increased hardness, and improved wear resistance.
Chemical composition
|
C |
0.95 - 1.20% |
|
Cr |
16.0 - 18.0% |
|
Yes |
1.00% |
|
Mn |
1.0% Max. |
|
S |
0.03% |
|
Mo |
0.075% Max |
Physical properties
|
Tensile strength |
285,000 psi |
|
Yield strength |
275,000 psi |
|
Elastic modulus |
29,000,000 psi |
|
Density |
0.277 lbs/cubic inch |
Production and processing
Packaging and shipping
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