Standard Test Method for
Effective Case Depth of Ferrous Powder Metallurgy (P/M)
Parts Using Microindentation Hardness Measurements1
This standard is issued under the fixed designation B 934; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (e) indicates an editorial change since the last revision or reapproval.
1. Scope
1.1 This test method covers a procedure for determination
of the effective case depth of powder metallurgy (P/M) parts.
1.2 A microindentation hardness traverse procedure is described to determine effective case depth. This test method may
be used to determine the effective case depth for all types of
hardened cases.
1.3 The procedure for determining the microindentation
hardness of powder metallurgy materials, as described in Test
Method B 933 shall be followed.
1.4 This standard does not purport to address all of the
safety concerns, if any, associated with its use. 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.
2. Referenced Documents
2.1 ASTM Standards: 2
B 243 Terminology of Powder Metallurgy
B 933 Test Method for Microindentation Hardness of Powder Metallurgy (P/M) Materials
E 18 Test Methods for Rockwell Hardness and Rockwell
Superficial Hardness of Metallic Materials
E 384 Test Method for Microindentation Hardness of Materials
2.2 Other Standard:
SAE J 423 Recommended Practice, Methods of Measuring
Case Depth3
3. Terminology
3.1 Definitions of powder metallurgy (P/M) terms can be
found in Terminology B 243. Additional descriptive information is available in the Related Material section of Volume
02.05 of the Annual Book of ASTM Standards.
3.2 Definitions of Terms Specific to This Standard:
3.2.1 case —that portion of a part, extending inward from
the surface that has a microindentation hardness, after hardening, equal to or greater than a specified hardness.
3.2.2 effective case depth—the perpendicular distance from
the surface of the hardened case to the furthest point where a
microindentation hardness value equivalent to 5
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