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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.
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Material Analysis:
S-2 Tool Steel (Rockbit) balls are manufactured to the following chemical analysis:
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Material
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AISI
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Federal
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Military
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ASTM
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UNS
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AMS
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Military and Gov't Stds.
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S-2 Tool Steel
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S-2
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QQ-T-570
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-
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A681
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T-4190
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-
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-
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Chemical Analysis
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Carbon............................................
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0.47% to 0.55%
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Manganese.....................................
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0.30% to 0.50%
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Silicon............................................
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0.90% to 1.10%
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Molybdenum...................................
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0.30% to 0.60%
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Phosphorus.....................................
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0.030% maximum
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Sulpher...........................................
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0.030% maximum
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Vanadium.......................................
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0.5% maximum
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Mechanical Properties
Hardness as measured on parallel flat surfaces is Rockwell “C” 55-58.
Ball of special hardness are available upon request.
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Tensile strength...............................
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310,000 psi
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Yield strength..................................
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290,000 psi
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Elongation in two inches...................
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7%
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Reduction in area.............................
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25%
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Modulus of elasticity........................
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30,000,000 psi
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Density...........................................
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0.283 lbs./cu. in
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