Stainless Steel | Precision & Semi-Precision Balls

Hoover manufactures 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. To learn more about our stainless steel products, please see the series types below.

302 Stainless Steel | 316 Stainless Steel | 316L Stainless Steel | 440 Stainless Steel

302 Stainless Steel

Balls: 302 Stainless Steel
Material	Size Range	Grade
AISI Type 302 Stainless	1/8 - 2” (3.175mm - 50.8mm)	100 - 1000
Additional Services: Special sizes upon request.

AISI type 302 stainless steel balls meet requirements for an unhardened ball with excellent toughness and resistance to corrosion. Corrosion resistance may be increased through annealing. Both non-annealed and annealed balls are widely used in valves and related equipment.

Stainless steel type 302 balls are capable of resisting corrosion by such agents as oxidizing solutions, most organic chemicals, food stuffs and sterilizing solutions. They are moderately resistant to sulfuric acids. Nonmagnetic properties are available upon request.

Applications include aerosol, sprayers, finger pumps mechanisms, milk machine blenders, food processing equipment and medical applications.

Material Analysis:
All sizes and grades are of the highest quality and in accordance with AISI type 302.
Passivation to ASTM A380 is available upon request..

Material	AISI	Federal	Military	ASTM	UNS	AMS
Stainless Steel Type 302	302	QQ-S-763	-	A-493	S-30200	-

Chemical Analysis:
Carbon..........................................0.15% maximum
Chromium....................................17.0% to 19.0%
Manganese..................................2.0% maximum
Silicon...........................................1.0% maximum
Nickel............................................8.0% to 10.0%
Phosphorus.................................0.045% maximum
Sulphur.........................................0.03% maximum

Mechanical Properties:
Hardness as measured on parallel flat surfaces is Rockwell “C” 25-39.
Tensile Strength.........................80,000 to 180,000 psi
Yield Strength..............................50,000 to 150,000 psi
Elongation in two inches..........10.0% to 50.0%
Reduction in area.......................55.0% to 65.0%
Modulus of elasticity...................29,000,000 psi
Density..........................................0.286 lbs./cu. in

316 Stainless Steel

Balls: 316 Stainless Steel
Material	Size Range	Grade
AISI Type 316 Stainless	1/8 - 2” (3.175mm - 50.8mm)	100 - 1000
Additional Services: Special sizes upon request.

AISI type 316 stainless steel balls meet requirements for an unhardened ball with excellent toughness and resistance to corrosion. Corrosion resistance may be increased through annealing. Both non-annealed and annealed balls are widely used in valves and related equipment.

AISI type 316 is an austenitic, chromium-nickel-molybdenum stainless steel and heat resisting steel with corrosion resistance superior to most other chromium-nickel stainless steels in many types of chemical corrodents, as well as, marine atmospheres.

Applications include phosphate industry parts, textile finishing equipment, printing equipment, body jewelry and valve industries.

Material Analysis:
All sizes and grades are of the highest quality and in accordance with AISI type 316. Passivation to ASTM A380 is available upon request.

Material	AISI	Federal	Military	ASTM	UNS	AMS
Stainless Steel Type 316	316	QQ-S-763	-	A-493	S-31600	-

Chemical Analysis:
Carbon..........................................0.08% maximum
Chromium....................................16.0% to 18.0%
Manganese..................................2.0% maximum
Silicon...........................................1.0% maximum
Nickel............................................10.0% to 14.0%
Phosphorus.................................0.045% maximum
Sulphur.........................................0.03% maximum

Mechanical Properties:
Hardness as measured on parallel flat surfaces is Rockwell “C” 25-39.
Tensile Strength.........................80,000 to 120,000 psi
Elongation in two inches..........10.0% to 15.0%
Reduction in area.......................55.0% to 65.0%
Modulus of elasticity...................28,000,000 psi
Density..........................................0.29 lbs./cu. in

316L Stainless Steel

Balls: 316L Stainless Steel
Material	Size Range	Grade
AISI Type 316L Stainless	1/8 - 2” (3.175mm - 50.8mm)	100 - 1000
Additional Services: Special sizes upon request.

AISI type 316L stainless steel balls meet requirements for an unhardened ball with excellent toughness and resistance to corrosion. Corrosion resistance may be increased through annealing. Both non-annealed and annealed balls are widely used in valves and related equipment.

Type 316L is a low carbon austenitic, chromium-nickel-molybdenum stainless steel with general corrosion resistance similar to type 316, but with superior resistance to intergranular corrosion following welding or stress relieving.

It is suggested for use in certain corrosive environments for parts that are fabricated by welding and cannot be subsequently annealed. Parts made from 316L are generally limited to service temperatures up to 800ºF (425ºC).

Material Analysis:
All sizes and grades are of the highest quality and in accordance with AISI type 316L. Passivation to ASTM A380 is available upon request..

Material	AISI	Federal	Military	ASTM	UNS	AMS
Stainless Steel Type 316L	316	QQ-S-763	-	A-493	S-31603	-

Chemical Analysis:
Carbon..........................................0.03% maximum
Chromium....................................16.0% to 18.0%
Manganese..................................2.0% maximum
Silicon...........................................1.0% maximum
Nickel............................................10.0% to 14.0%
Phosphorus.................................0.045% maximum
Sulphur.........................................0.03% maximum

440 Stainless Steel

Balls: 440 Stainless Steel
Material	Size Range	Grade
440SS	3/16 - 1 1/2” (4.762mm - 38.1mm)	10 - 48
440SS	1/8 - 2” (3.175mm - 52.0mm)	100 - 1000
440SS	1/16 - 6” (1.587mm - 152.4mm)	24 - 1000 (Special Sizes)
Additional Services: Special sizes upon request.

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) materials are available upon request.

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.