ASTM G75-15

Standard Test Method for Determination of Slurry Abrasivity (Miller Number) and Slurry Abrasion Response of Materials (SAR Number)

SIGNIFICANCE AND USE
5.1 The Miller Number5 is an index of the relative abrasivity of slurries. Its primary purpose is to rank the abrasivity of slurries in terms of the wear of a standard reference material. The wear damage on the standard wear block is worse as the Miller Number gets higher.  
5.2 The SAR Number is an index of the relative abrasion response of materials as tested in any particular slurry of interest. The SAR Number is a generalized form of the Miller Number applicable to materials other than the reference material used for the Miller Number determination. A major purpose is to rank construction materials for use in a system for pumping and fluid handling equipment for a particular slurry. It can also be used to rank the abrasivity of various slurries against any selected construction material other than the reference material specified for a Miller Number determination. The slurry damage on the specimen of material being tested is worse as the SAR Number gets higher.  
5.3 Experience has shown that slurries with a Miller Number or a SAR Number of approximately 50 or lower can be pumped with minor abrasive damage to the system. Above a number of 50, precautions must be observed and greater damage from abrasion is to be expected. Accordingly, the Miller Number and the SAR Number provide information about the slurry or the material that may be useful in the selection of pumps and other equipment and to predict the life expectancy of liquid-end parts of the pumps involved.  
5.4 The SAR Number can be used to determine the most suitable materials for certain slurry systems.
SCOPE
1.1 This test method covers a single laboratory procedure that can be used to develop data from which either the relative abrasivity of any slurry (Miller Number) or the response of different materials to the abrasivity of different slurries (SAR Number), can be determined.  
1.2 The test data obtained by this procedure is used to calculate either a number related to the rate of mass loss of duplicate standard-shaped 27 % chromium iron wear blocks when run for a period of time in the slurry of interest (Miller Number), or to calculate a number related to the rate of mass loss (converted to volume loss) of duplicate standard-shaped wear specimens of any material of interest when run for a period of time in any slurry of interest (SAR Number).  
1.3 The requirement for a finished flat wearing surface on the test specimen for a SAR Number test may preclude application of the procedure where thin (0.051 to 0.127-mm), hard, wear-resistant coatings will not allow for surface finishing. The 6 hours total duration of the SAR Number Test may not allow establishment of a consistent rate-of-mass-loss of the unfinished surface.  
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.

General Information

• Status: Historical
• Publication Date: 31-Oct-2015
• ICS: 17.040.20 - Properties of surfaces
• Technical Committee: G02 - Wear and Erosion
• Drafting Committee: G02.30 - Abrasive Wear

Standards Content (Sample)

NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
Contact ASTM International (www.astm.org) for the latest information
Designation: G75 − 15
Standard Test Method for
Determination of Slurry Abrasivity (Miller Number) and
1
Slurry Abrasion Response of Materials (SAR Number)
ThisstandardisissuedunderthefixeddesignationG75;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginal
adoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscript
epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope 2.2 Military Standard:
MIL-R-6855CRubber, Synthetic, Sheets, Strips, Molded or
1.1 This test method covers a single laboratory procedure
3
Extruded Shapes
that can be used to develop data from which either the relative
abrasivity of any slurry (Miller Number) or the response of
3. Terminology
different materials to the abrasivity of different slurries (SAR
3.1 Definitions:
Number), can be determined.
3.1.1 Definitions used in this test method are in accordance
1.2 The test data obtained by this procedure is used to
with Terminology G40 as follows:
calculate either a number related to the rate of mass loss of
3.1.2 abrasive wear—wear due to hard particles or hard
duplicate standard-shaped 27% chromium iron wear blocks
protuberancesforcedagainstandmovingalongasolidsurface.
when run for a period of time in the slurry of interest (Miller
Number), or to calculate a number related to the rate of mass
3.1.3 corrosive wear—wear in which chemical or electro-
loss (converted to volume loss) of duplicate standard-shaped
chemical reaction with the environment is significant.
wear specimens of any material of interest when run for a
3.1.4 abrasion-corrosion—a synergistic process involving
period of time in any slurry of interest (SAR Number).
both abrasive wear and corrosion in which each of these
1.3 The requirement for a finished flat wearing surface on processes is affected by the simultaneous action of the other
the test specimen for a SAR Number test may preclude and, in many cases is thereby accelerated.
application of the procedure where thin (0.051 to 0.127-mm),
3.1.5 cumulative erosion-time curve—a plot of cumulative
hard, wear-resistant coatings will not allow for surface finish-
erosion versus cumulative exposure duration, usually deter-
ing. The 6 hours total duration of the SAR Number Test may
mined by periodic interruption of the test and weighing of the
notallowestablishmentofaconsistentrate-of-mass-lossofthe
specimen. This is the primary record of an erosion test. Most
unfinished surface.
other characteristics, such as the incubation period, maximum
1.4 This standard does not purport to address all of the
erosionrate,terminalerosionrate,anderosionrate-timecurve,
safety concerns, if any, associated with its use. It is the are derived from it.
responsibility of the user of this standard to establish appro-
3.1.6 erosion—progressive loss of original material from a
priate safety and health practices and determine the applica-
solid surface due to mechanical interaction between that
bility of regulatory limitations prior to use.
surface and a fluid, a multi-component fluid, or impinging
liquid or solid particles.
2. Referenced Documents
3.1.7 erosion-corrosion—a conjoint action involving corro-
2
2.1 ASTM Standards:
sion and erosion in the presence of a corrosive substance.
G40Terminology Relating to Wear and Erosion
3.1.8 instantaneous erosion rate—the slope of a tangent to
the cumulative erosion-time curve at a specified point on that
curve.
1
This test method is under the jurisdiction of ASTM Committee G02 on Wear
and Erosion and is the direct responsibility of Subcommittee G02.30 on Abrasive 3.2 Definitions of Terms Specific to This Standard:
Wear.
3.2.1 mass concentration—the mass of solid particles per
Current edition approved Nov. 1, 2015. Published November 2015. Originally
unit mass of mixture, expressed in percent.
approved in 1982. Last previous edition approved in 2013 as G75–07 (2013). DOI:
10.1520/G0075-15.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM
3
Standards volume information, refer to the standard’s Document Summary page on AvailablefromStandardizationDocumentsOrderDesk,Bldg.4SectionD,700
the ASTM website. Robbins Ave., Philadelphia, PA 19111-5094, Attn: NPODS.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1

---------------------- Page: 1 ----------------------
G75−15
3.2.2 Miller Number—a measure of slurry abrasivity as
related to the instantaneous rate of mass loss of a standard
metalwearblockataspecifictimeonthecumulativeabrasion-
corrosion time curve.
3.2.3 SAR Number—a measure of the relative abrasion
response of any material in any slurry, as related to the
instantaneousrateofmass-lossofa
...

This document is not an ASTM standard and is intended only to provide the user of an ASTM standard an indication of what changes have been made to the previous version. Because
it may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current version
of the standard as published by ASTM is to be considered the official document.
Designation: G75 − 07 (Reapproved 2013) G75 − 15
Standard Test Method for
Determination of Slurry Abrasivity (Miller Number) and
1
Slurry Abrasion Response of Materials (SAR Number)
This standard is issued under the fixed designation G75; 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.
1. Scope
1.1 This test method covers a single laboratory procedure that can be used to develop data from which either the relative
abrasivity of any slurry (Miller Number) or the response of different materials to the abrasivity of different slurries (SAR Number),
can be determined.
1.2 The test data obtained by this procedure is used to calculate either a number related to the rate of mass loss of duplicate
standard-shaped 27 % chromium iron wear blocks when run for a period of time in the slurry of interest (Miller Number), or to
calculate a number related to the rate of mass loss (converted to volume loss) of duplicate standard-shaped wear specimens of any
material of interest when run for a period of time in any slurry of interest (SAR Number).
1.3 The requirement for a finished flat wearing surface on the test specimen for a SAR Number test may preclude application
of the procedure where thin (0.051 to 0.127-mm), hard, wear-resistant coatings will not allow for surface finishing. The 6 hours
total duration of the SAR Number Test may not allow establishment of a consistent rate-of-mass-loss of the unfinished surface.
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
2.1 ASTM Standards:
G40 Terminology Relating to Wear and Erosion
2.2 Military Standard:
3
MIL-R-6855C Rubber, Synthetic, Sheets, Strips, Molded or Extruded Shapes
3. Terminology
3.1 Definitions:
3.1.1 Definitions used in this test method are in accordance with Terminology G40 as follows:
3.1.2 abrasive wear—wear due to hard particles or hard protuberances forced against and moving along a solid surface.
3.1.3 corrosive wear—wear in which chemical or electrochemical reaction with the environment is significant.
3.1.4 abrasion-corrosion—a synergistic process involving both abrasive wear and corrosion in which each of these processes
is affected by the simultaneous action of the other and, in many cases is thereby accelerated.
3.1.5 cumulative erosion-time curve—a plot of cumulative erosion versus cumulative exposure duration, usually determined by
periodic interruption of the test and weighing of the specimen. This is the primary record of an erosion test. Most other
characteristics, such as the incubation period, maximum erosion rate, terminal erosion rate, and erosion rate-time curve, are derived
from it.
3.1.6 erosion—progressive loss of original material from a solid surface due to mechanical interaction between that surface and
a fluid, a multi-component fluid, or impinging liquid or solid particles.
3.1.7 erosion-corrosion—a conjoint action involving corrosion and erosion in the presence of a corrosive substance.
1
This test method is under the jurisdiction of ASTM Committee G02 on Wear and Erosion and is the direct responsibility of Subcommittee G02.30 on Abrasive Wear.
Current edition approved Nov. 15, 2013Nov. 1, 2015. Published November 2013November 2015. Originally approved in 1982. Last previous edition approved in 20072013
as G75–07. –07 (2013). DOI: 10.1520/G0075-07R13.10.1520/G0075-15.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM Standards
volume information, refer to the standard’s Document Summary page on the ASTM website.
3
Available from Standardization Documents Order Desk, Bldg. 4 Section D, 700 Robbins Ave., Philadelphia, PA 19111-5094, Attn: NPODS.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1

---------------------- Page: 1 ----------------------
G75 − 15
3.1.8 instantaneous erosion rate—the slope of a tangent to the cumulative erosion-time curve at a specified point on that curve.
3.2 Definitions of Terms Specific to This Standard:
3.
...