ASTM D6425-05

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Designation:D6425–05
Standard Test Method for
Measuring Friction and Wear Properties of Extreme
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Pressure (EP) Lubricating Oils Using SRV Test Machine
This standard is issued under the fixed designation D6425; 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 (´) indicates an editorial change since the last revision or reapproval.
INTRODUCTION
This test method represents the transformation of DIN 51834-2:1997. The DIN working group
implemented changes at its annual meeting in Munich in September 2000. ASTM Committee D02
adopted these modifications as closely as possible. The DIN working group widens the scope of the
standard to accommodate different test conditions and refines repeatability and reproducibility on the
base of four international RR tests. It also introduces the wear volume as a tribological quantity.
1. Scope D4175 Terminology Relating to Petroleum, Petroleum
Products, and Lubricants
1.1 This test method covers an extreme pressure (EP)
E45 Test Methods for Determining the Inclusion Content of
lubricating oil’s coefficient of friction and its ability to protect
Steel
against wear when subjected to high-frequency, linear oscilla-
G40 Terminology Relating to Wear and Erosion
tion motion. The procedure is identical to that described in
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2.2 DIN Standards:
DIN 51834.
DIN EN ISO 683-17 Heat-treated Steels, alloy steels and
1.2 This test method can also be used to determine the
free-cutting steels – Part 17 : Ball and roller bearing steels
ability of a non-EP lubricating oil to protect against wear and
DIN 51631:1999 Mineral spirits; special boiling point spir-
its coefficient of friction under similar test conditions.
its; requirements
1.3 The values stated in SI units are to be regarded as
DIN 51834 Tribological Test in the Translatory Oscillation
standard. No other units of measurement are included in this
Apparatus (Part 2: Determination of Friction and Wear
standard.
Data for Lubricating Oils)
1.4 This standard does not purport to address all of the
DIN EN ISO 13565-2:1998 Geometrical Product Specifica-
safety concerns, if any, associated with its use. It is the
tions (GPS)—Surface Texture: Profile Method; Surfaces
responsibility of the user of this standard to establish appro-
having Stratified Functional Properties—Part 2: Height
priate safety and health practices and determine the applica-
Characterization using Linear Material Ratio Curve (re-
bility of regulatory limitations prior to use.
placement of DIN 4776:1990)
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2. Referenced Documents
2.3 ISO Standards:
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ISO 1250:1972 Mineral Solvents for Paints, White Spirits
2.1 ASTM Standards:
and Related Hydrocarbon Solvents
A295 Specification for High-Carbon Anti-Friction Bearing
Steel
3. Terminology
3.1 Definitions:
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This test method is under the jurisdiction of ASTM Committee D02 on
3.1.1 break-in, n—in tribology, an initial transition process
Petroleum Products and Lubricants and is the direct responsibility of Subcommittee
occurring in newly established wearing contacts, often accom-
D02.L0 on Industrial Lubricants.
panied by transients in coefficient of friction or wear rate, or
Current edition approved July 1, 2005. Published August 2005. Originally
approved in 1999. Last previous edition approved in 2002 as D6425–02. DOI:
10.1520/D6425-05.
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For referenced ASTM standards, visit the ASTM website, www.astm.org, or Available from Deutsches Institut für Normung, Beuth Verlag GmbH, Burg-
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM grafenstrasse 6, D-10787 Berlin, Germany.
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D6425–05
both, that are uncharacteristic of the given tribological sys-
tem’s long term behavior. (Synonym: run-in, wear-in) G40
3.1.2 C.L.A., n—in measuring surface finish, the arithmetic
average of the absolute distances of all profile points from the
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mean line for a given distance.
3.1.3 coeffıcient of friction µ or f, n—in tribology, the
dimensionless ratio of the friction force (F) between two
f
bodies to the normal force (F ) pressing these bodies together.
n
G40
µ 5 ~F / F ! (1)
f n
3.1.4 EP lubricating oil, n—a liquid lubricant containing an
extreme pressure (EP) additive
3.1.5 extreme pressure (EP) additive, n—in a lubricant,a
FIG. 1 SRV Test Machine
substance that minimizes damage to metal surf
...