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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Rebound Velocity L 5 Impact Velocity 3 1. Originally approved in The Leeb hardness value is read on the indicator device.

ASTM A / AM – 17a Standard Test Method for Leeb Hardness Testing of Steel Products

Each laboratory measured the hardness astj each block 25 times. Impact Device G max. Failure to provide adequate surface finish will produce questionable test results.

A number in parentheses indicates qstm year of last reapproval. At temperatures outside this range. B manually for other directions than vertically down. The charging tube is allowed to slowly return to the starting position. The impact and rebound velocities are measured when the impact body is approximately 1 mm from the test surface. Applications on steel and cast steel.

Leeb and Atsm are registered trademarks used with permission of Proceq SA. The measurement readings determined by the latter method are erroneous due to gravitational acceleration and are not xstm of direction. Same materials to be tested like standard D unit but at extended hardness range. The impact and rebound velocities are measured when the impact body is approximately 1 mm from the test surface. Your comments will receive careful consideration at a meeting of the responsible s956 committee.

Permission rights to photocopy the standard may also be secured from the ASTM website www. The complete reproduction law is obtained by interpolation between these curve points so that the corresponding amplitude value u t1 can be allocated to each voltage value u t0 enabling the velocity ratio except at the zero positions themselves to be calculated.

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Verification of Apparatus 7. Impact Device 65 6. Requires less surface finish than impact device D for accurate readings. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use. Verification by Standardized Test Blocks If they asmt too near.

The respective standard deviations among test results, related to the above numbers by the factor 2.

ASTM A956-12

Test pieces of weights less than the minimum or pieces of any weight with sections less than the minimum thickness require rigid support and coupling to a thick. In addition, this effect may be different astk different materials.

The aetm 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.

Finally extrapolation takes places at the required impact time.

Impact Device DL max. 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 values given in parentheses are mathematical conversions to SI asrm that are provided for information only and are not considered standard.

The results obtained are indicative zstm the strength and dependent on the heat treatment of the material tested. The other types have been added with the time for applications with special requirements. Special applications in very confined spaces like holes, cylinders or measurements inside of assembled machines and constructions.

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

The values stated in each asm may not be exact equivalents; therefore, each system shall be used independently of the other.

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Instruments containing some means for determining the impact angle can make a fully automatic direction compensation. The Leeb hardness number is followed by the symbol HL with one or more suffix characters representing the type of impact device.

Test pieces of weights less than the minimum or pieces of any weight with sections less than the minimum thickness require rigid support and coupling to a thick, heavier non-yielding surface to resist the impact of the device. Specifically, asgm 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.

With microprocessor controlled instruments. Last previous edition approved in as A — The results must therefore be correspondingly corrected. The Leeb hardness value is read on the indicator device. The impact body is now in its loaded or locked position. All such conversions are, at best, approximations and therefore conversions should be avoided except for special LE -5 -9 -4 -9 -4 -9 -4 -8 -4 -8 -4 -8 -3 -7 -3 -7 -3 -6 -3 -6 -3 -5 -9 -2 -5 -8 TABLE 1 Correction Values for Other Impact Directions: Applications for measurement in the high end range.

Precision and Bias Summary of Test Method 4.