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ASTM A956 PDF

A – 02 Standard Test Method for Leeb Hardness Testing of Steel Products, Dynamic Hardness Test, Equotip, Equotip Hardness Test, Leeb, Rebound. A/AM – 17 Standard Test Method for Leeb Hardness Testing of Steel Products, dynamic hardness test, Equotip, Equotip hardness test, Leeb, rebound . ASTM A – Download as PDF File .pdf), Text File .txt) or read online.

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This compensation value can be determined in accordance with Tables In addition to the hardness.

In order to reproduce the standard direction dependency, it is necessary to specify velocity and mass separately and to have a specific free flight length. Last previous edition approved in as A — Asrm extrapolation takes places at the required impact time. This disadvantage is not apparent in instruments which operate according to the Krautkramer rebound method. For the definition of some of the parameters refer to Fig. Combining values from the two systems may result in non-conformance with the standard.

The grinding wheel grit size shown for each finish is offered for guidance in achieving the finish noted. We need your help! Coarse finishes will tend to lower the measured value.

The results obtained are indicative of the strength and dependent on the heat treatment of the material tested. Requires better surface finish than impact device D. This is accomplished by means of a permanent magnet mounted in the impact body which, during the test, moves through a coil in the impact device and induces an electric voltage on both the impact and rebound movements.

Each of the a56 probes has its own characteristic direction dependency. If the material being tested is considered to be nonhomogeneous for example, cast iron ten impacts in an area shall be made to constitute a test.

A number in parentheses indicates the year of last reapproval. The ratio of the rebound velocity xstm the impact velocity of the impact body is a measure of the hardness of the material under test. The measurement readings determined by the latter method are erroneous due to gravitational acceleration and are not independent of direction. The main reasons for this are: Specifically, one calibration block of a hardness equal to or lower than the minimum expected hardness of the material being tested, one calibration block of a hardness equal to or greater than the maximum expected hardness of the material being tested, and one calibration block near the middle of the range should be used.

ASTM A956-06.pdf

The charging tube is allowed to slowly return to the adtm position. If replacement, non-original equipment parts are used, multiple block calibration verification is strongly advised. When replacement parts are used in a Leeb hardness tester it is important that they be fully compatible with 9a56 original equipment. These induced voltages are proportional to the respective impact and rebound velocities. The quotient of these measured voltage values derived from the impact and rebound velocities, multiplied by the factor produces a number which constitutes the Leeb hardness value.

Users of this standard are expressly advised that determination of the validity of any such patent rights. Owing to the different orientations during the measurement sequence, one obtains astk coverage of the impact energy range occurring when in operation.

ASTM A – 00 Standard Test Method for Leeb Hardness Testing of Steel Products NO_PDF

No conversions shall be employed without specific agreement between the party specifying this test method and the party performing the hardness test. In order to reproduce the standard direction dependency. Thank you for interesting in our services.

The results generated at that location do zstm represent the part at any other surface location and yield no information about the material at subsurface locations.

The Leeb hardness value is read on the indicator device. This is a measure for the velocity of the impact body: Some newer models automatically compensate for test direction. The two opposite end plane surfaces shall be parallel. Rebound Velocity L 5 Impact Velocity 3 1. Each of the standard aa956 has its own characteristic direction dependency, which is determined by: Probe S LS -4 -4 -4 -4 -3 -3 -3 -3 -3 -2 -2 -5 -7 -5 -8 -5 -9 -6 -6 -7 -7 -7 -8 -8 -9 aatm. Impact Device 65 6.

Furthermore, the L value depends on the geometry of the indenter and its material properties, predominantly hardness and elasticity.

Impact bodies tend to wear out at the high end of hardness range. Individual reprints single or multiple copies of this standard may be obtained by contacting ASTM at the above address or at phone. Probe C LE LE -7 -7 -7 -6 -6 -6 -5 -5 -4 -4 -4 -3 -2 -5 -4 -3 -3 -2 -2 -9 a9556 -6 -5 -4 -3 -9 -7 -6 -6 -3 -5 -7 -3 -6 -8 -9 LD -2 -2 -2 -2 -2 -5 -9 -5 -9 -5 -5 -5 TABLE X1. The results obtained are indicative of the strength and dependent on the heat treatment of the material tested.

Impact bodies show no wear even at high hardness levels when compared to D device.

L5 Rebound Velocity 3 Impact Velocity 1. Same materials to be tested like standard D unit but at extended hardness range.

Owing to the different orientations during the measurement sequence. Coil and permanent magnet are not explicitly specified. Originally approved in