4140/42 Annealed — ASTM A331
CTI Color-Black
This alloy responds well to heat treatment. Its chromium content provides good hardness penetration, and the molybdenum imparts uniformity of hardness and high strength. In the annealed condition it machines at 110 sfm. Other desirable properties include good wear resistance, excellent toughness and good ductility in the quenched and tempered condition.
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Chemistry
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Carbon
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0.38/0.43
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Manganese
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0.75/1.00
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Phosphorus (Max.)
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0.035
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Sulfur (Max.)
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0.04
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Silicon
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0.15/0.35
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Chromium
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0.80/1.10
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Molybdenum
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0.15/0.25
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Typical Mechanical Properties
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| Tensile Strength |
105,000 psi
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| Yield Strength |
85,000 psi
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| Elongation in 2” |
15%
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| Reduction of Area |
45%
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| Brinell Hardness |
215
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Machinability
65% of 1212
Applications
Highly stressed parts, or parts subject to severe wear.