440C Stainless Steel

Hoover manufactures high-precision balls from a variety of 400 series stainless steels including 420, 430, and 440. 400 series stainless steel balls are moderately corrosion resistant and can be hardened by heat treating for durability.  Type 300 series or austenitic stainless steel balls are offered in 302, 304 and 316 under our "Semi-Precision Menu". Our production of 420 and 430 Stainless Steel balls is limited; please contact your local sales representative for availability.  To learn more about our stainless steel products, please see the series types below.

Balls: 440C Stainless Steel High-Precision

Material

Size Range

Grade

440CSS

.03937 - 1” (.03937 - 25.00mm)

3 - 25

Additional Services: DFAR, Stabillization, Vaccum Melt, Air Melt, NADCAP Passivation


AISI type 440-C stainless steel balls afford the advantage of maximum hardness combined with corrosion-resisting properties. This hardness, together with precise geometry and fine surface finish, makes them especially useful for bearing and valve applications where severe environmental conditions may occur.

Consumable electrode vacuum meleted (CEVM) and vacuum induction melted/vacuum arc remelted (VIM-MAR) are available upon request.  Please see menu for product details.

Material Analysis:
All sizes and grades of corrosion-resisting hardened stainless steel balls are made to ASTM 756. Passivation to ASTM A380 and QQ P 35 is available upon request.

Material

CDA

Federal

Military & Gov’t Std.

ASTM

UNS

AMS

Type 440

440-C

QQ-S-763b

MS 19060

ASTM-756

S-44004

5630G
5880A


Chemical Analysis:
Carbon.............................0.95% to 1.10%
Chromium.......................16.0% to 18.0%
Manganese.....................1.0% maximum
Silicon..............................1.0% maximum
Molybdenum....................0.40% to 0.65%
Phosphorus....................0.025% maximum
Sulphur............................0.025% maximum
Nickel...............................0.75% maximum
Copper.............................0.5% maximum

Mechanical Properties:
Type 440-C steel balls are uniformly hardened and tempered throughout their entire diameter to achieve maximum strength and quality. Ball hardness is 58-65 Rockwell “C” as measured on parallel flat surfaces. Also, type 440-C stainless steel balls are magnetic. Custom heat treating is available for special hardness requirements.
Tensile Strength........................285,000 psi
Yield Strength.............................275,000 psi
Elongation in two inches..........2.0%
Reduction in area......................10.0%
Modulus of elasticity..................29,500,000 psi
Density.........................................0.277 lbs./cu. in.

Please note that the material information provided on our website is for informational purposes only. The properties listed per product type are typical and can vary based on suppliers of raw materials and customer specific needs. Please contact customer service for verification prior to ordering. Price and delivery may be subject to change based on specific requirements.

Scroll to Top