Products > Precision & Semi-Precision Balls > S-2 Tool Steel (Rock Bit)

Balls: S-2 Tool Steel (Rock Bit)
Material	Size Range	Grade
S-2 Tool Steel (Rock Bit)	3/8 - 1 3/8” (9.525mm - 34.9mm)	50 - 200

S-2 Tool Steel balls are designed to achieve extreme ruggedness. The ball surface has a smooth ground and polished finish. These balls provide the toughness and strength necessary for severe shock loads.  S-2 Tool Steel balls are hardened throughout and have unusually good wear characteristics.

S-2 Tool Steel balls find most frequent use in oil field equipment and offshore drilling operations.
They provide good service in withstanding the abrasion of pulverized rock and mud slurries.

Material Analysis:
S-2 Tool Steel (Rockbit) balls are manufactured to the following chemical analysis:

Material	AISI	Federal	Military	ASTM	UNS	AMS	Military & Gov’t Stds.
S-2 Tool Steel	S-2	QQ-T-570	-	A681	T-4190	-	-

Chemical Analysis:
Carbon............................................0.47% to 0.55%
Manganese....................................0.30% to 0.50%
Silicon.............................................0.90% to 1.10%
Molybdenum..................................0.30% to 0.60%
Phosphorus...................................0.030% maximum
Sulpher...........................................0.030% maximum
Vanadium.......................................0.5% maximum

Mechanical Properties
Hardness as measured on parallel flat surfaces is Rockwell “C” 55-58.
Ball of special hardness are available upon request.
Tensile Strength............................310,000 psi
Yield Strength................................290,000 psi
Elongation in two inches.............7%
Reduction in area.........................25%
Modulus of elasticity....................30,000,000 psi
Density...........................................0.283 lbs./cu. in.