440 Stainless Steel Balls

440 Stainless Steel balls are a martenistic-type stainless steel which is used extensively in steel ball bearing applications that require hardness, dimensional stability, corrosion resistance and toughness. 440 Stainless Steel is also used for corrosion-resistant ball and check valves. 440 ball are resistant to corrosion from fresh water, steam, crude oil, gasoline, perspiration, alcohol, blood and food stuffs. Maximum resistance to corrosion and tarnishing is only achieved when 440 is fully hardened and surfaces are polished to a high luster. 440 is also magnetic.


Material Analysis

Carbon 0.95-1.20%
Chromium 16.0-18.0%
Silicon 1.00%
Manganese 1.0% Max.
Phosphorus 0.040%
Sulfur 0.030%
Molybdenum 0.075%


Mechanical Properties

Tensile Strength 285,000 psi
Yield Strength 275,000 psi
Modulus of Elasticity 29,000,000 psi
Density 0.277 lbs/cubic inch

The information on this web site is intended for guidance only. Since we gathered technical data from various technical sources, the actual mechanical and physical properties will vary from one lot of material to the next. Therefore, we accept no liability for deficiencies or damages arising from the use of this data, and customers should determine the suitability of a material or product by conducting practical tests under realistic conditions.

Need Help with Your 440 Stainless Steel Precision Ball Project?