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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Applications on steel and cast steel. Calibration using a single standard test block may indicate acceptable results.

ASTM A956-12

It ashm recommended that the test surface be machined or ground and polished to the following finishes. The main reasons for this are: Device Aetm 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 A number in parentheses indicates the year of last reapproval.

Instruments containing some means for determining the impact angle can make a fully automatic direction compensation. The Leeb hardness test is of the dynamic or rebound type, which primarily depends both on the plastic and on the elastic properties of the material being tested.

ASTM A – 02 Standard Test Method for Leeb Hardness Testing of Steel Products

The respective standard deviations among test results, related to the above numbers by the factor 2. Owing to the different orientations during the measurement sequence, one obtains complete coverage of the impact energy range occurring when in operation. For the definition of some of the parameters refer to Fig.


We need your help to maintenance this website. Impact Device 65 6. This is accomplished by means of a permanent magnet mounted in the impact body which, a9566 the test, moves through a coil in the impact device and induces an electric voltage on both the impact and rebound movements.

Coarse finishes will tend to lower the measured value. Same materials to be tested like standard D unit but at extended hardness range. The two opposite end plane surfaces shall be parallel.

Impact bodies show minimal wear even at high hardness levels when compared to D device. The results obtained are indicative of the strength and dependent on the heat treatment of a9566 material tested. 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 max.

The satm and rebound velocities aa956 measured when the impact body is approximately 1 mm from the test surface. The values given in parentheses are mathematical conversions to SI units that are provided for information only and are not considered standard.

With microprocessor controlled instruments. Applications on walled or impact sensitive components small measuring indentation too.

It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use. The ratio of the rebound velocity to the impact velocity of the impact body is a measure of the hardness of the material under test.

The width of the signal curve has some influence on the result, because it determines, how good the proportionality between mimimum value B and rebound velocity is. So the tube material must be specified, too, as well as special precautions have to bee taken to reduce eddy currents. Your comments are invited either for revision of this standard or for additional standards and should be addressed to ASTM International Headquarters. Each laboratory measured the hardness of each block 25 times.

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The results must therefore be correspondingly corrected. This correction value can be determined in accordance with Tables Requires less surface finish than impact device D for accurate readings.

The indicated value is automatically replaced with the next test impact result. Please fill this form, we will try to respond as soon as possible.

Leeb and Equotip are registered trademarks used with permission of Proceq SA. Finally extrapolation takes places at the required impact time.

ASTM A956-06.pdf

Historical Version s – view previous versions of standard. When replacement parts are used in a Leeb hardness tester it is important that they be fully compatible with the original equipment. Brief descriptions of the types of devices and their common applications are given in Appendix X1.

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. Any instrument not verified shall not be used for testing without repair and re-verification. Coil and permanent magnet are not explicitly specified.

The measurement readings determined by the latter method are erroneous due to gravitational acceleration and are not independent of direction.