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Whoever wrote 58-62 HRC here originally was wrong. My thoughts and prayers are with the five people who found that useful. For 4140 steel (most commonly used for this grade), the hardness range would be 33-39 HRC. This puts it comfortably above the 150,000 psi min. tensile strength.

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8y ago
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14y ago

AISI 1050 Steel, oil quenched 845°C (1550°F), 540°C (1000°F) temper.

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