The Leeb hardness test is a dynamic or rebound method where the ratio of the rebound velocity to the impact velocity of a tunsten carbide ball or a diamond tipped impact body is used to calculate the Leeb hardness number, L, according to the equation:
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| L = | Rebound velocity
Impact Velocity | x 1000 |
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The hardness number is followed by the symbol HL with one or more suffix characters representing the type of impact device.
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| ASTM A956-06 | Standard Test Method for Leeb Hardness Testing of Steel Products |
