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AISI S-2 (Rockbit) Tool Steel
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Material Analysis
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Carbon
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0.47 to 0.52%
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Molybdenum
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0.40 to 0.50%
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Silicon
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0.90 to 1.10%
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Manganese
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0.30 to 0.50%
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Chromium
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0.20% Max.
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Mechanical Properties
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Tensile strength
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approx. 310,000 psi
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Yield strength
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approx. 290,000 psi
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Elongation in 2"
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7 to 8%
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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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0.286 lbs/cu. in.
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Hardness
Rock bit balls have a uniform hardness of 54-60, Rockwell C scale,
using the parallel flat method.
Applicability
Suited to extreme conditions common to oil drilling, the material provides
toughness, strength, shock and abrasion resistance.
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