S-2 Rockbit Balls
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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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S-2 Tool Steel (Rockbit) Balls: Available
Grades and Sizes
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Grade
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Size Range in Inches and Millimeters
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50 - 200
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5/32 - 1 3/4
3.968 - 38.100
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Click here for sizes and pricing |
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Balls per Pound
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Size
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Balls per Pound
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Inches
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Millimeters
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3/16
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4.762
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1,020
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7/32
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5.556
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645
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1/4
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6.350
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432
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9/32
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7.143
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303
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5/16
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7.937
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221
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11/32
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8.731
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166
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3/8
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9.525
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128
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13/32
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10.318
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101
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7/16
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11.112
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80.6
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15/32
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11.906
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65.5
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1/2
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12.700
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54.0
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17/32
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13.493
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445.0
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9/16
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14.287
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37.9
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5/8
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15.875
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27.6
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11/16
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17.462
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20.8
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3/4
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19.050
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16.0
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13/16
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20.637
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12.6
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7/8
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22.225
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10.1
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1
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25.400
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6.75
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1 1/8
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28.575
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4.74
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1 1/4
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31.750
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3.46
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1 1/2
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38.100
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2.00
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* Upon special request only.
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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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©
copyright 2005 Hoover Precision Products, Inc., All Rights Reserved |