A 956-06 Standard Test Method for Leeb Hardness Testing of Steel Products

Designation: A 956-06 Standard Test Method for Leeb Hardness Testing of Steel Products1
1. Scope*
1.1This test mcthod covers the determination of the Lecbhardness of steel, cast steel. and cast iron (Part A). includingthe methods for the verification of Lecb hardness testinginstruments (Part B). and the calibration of standardized lestblocks (Part C).
NoE l—The oeiginal title of this standardl was ""Standard Test Methodfor Equatip Hardness Testing of Steel Products."-"
1.2 The values stated in inch-pound units are to be regardedas standard.Thc valucs given in parenthcses are mathematicalconversions to SI units that are provided for infonmation onlyand are not considered standard.
1.3 This standard does wor parporr to address all of thesafety concernts.if cnay. associated with is ase. It is therespowsibiliry of the user of this sfaPidard ro establisla appro-priate safety and healrie pracrices cand detersine the appiicce-bility of regulctory limitations prior to use.
2.Referenced Documents
2.1 A.STM Standards: 2
E 691 Practice for Conducting an Interlaboratory Study toDetermine the Precision of a Test Method
3. Terminology
3.1 Defiirionxs:
3.1.1 calibrationr——determination of the values of the sig-nificant operating parameters of the instrument by comparisonwith values indicaied by a reference instrument or by a set ofreference standards.
3.1.2 Leeb hardness anber——a number equal to the ratio ofthe rebound velocity to the impact velocity of a 3-mm or S-mm(based on the type of impact devicey diamcter tungsten carbideball or diamond tipped impact body, multiplied by 1000.