ASTM_G_75_-_15.pdf

Designation:G7515Standard Test Method forDetermination of Slurry Abrasivity(Miller Number)andSlurry Abrasion Response of Materials(SAR Number)1This standard is issued under the fixed designation G75;the number immediately following the designation indicates the year of originaladoption or,in the case of revision,the year of last revision.Anumber in parentheses indicates the year of last reapproval.Asuperscriptepsilon()indicates an editorial change since the last revision or reapproval.1.Scope1.1 This test method covers a single laboratory procedurethat can be used to develop data from which either the relativeabrasivity of any slurry(Miller Number)or the response ofdifferent materials to the abrasivity of different slurries(SARNumber),can be determined.1.2 The test data obtained by this procedure is used tocalculate either a number related to the rate of mass loss ofduplicate standard-shaped 27%chromium iron wear blockswhen run for a period of time in the slurry of interest(MillerNumber),or to calculate a number related to the rate of massloss(converted to volume loss)of duplicate standard-shapedwear specimens of any material of interest when run for aperiod of time in any slurry of interest(SAR Number).1.3 The requirement for a finished flat wearing surface onthe test specimen for a SAR Number test may precludeapplication of the procedure where thin(0.051 to 0.127-mm),hard,wear-resistant coatings will not allow for surface finish-ing.The 6 hours total duration of the SAR Number Test maynot allow establishment of a consistent rate-of-mass-loss of theunfinished surface.1.4 This standard does not purport to address all of thesafety concerns,if any,associated with its use.It is theresponsibility of the user of this standard to establish appro-priate safety and health practices and determine the applica-bility of regulatory limitations prior to use.2.Referenced Documents2.1 ASTM Standards:2G40 Terminology Relating to Wear and Erosion2.2 Military Standard:MIL-R-6855C Rubber,Synthetic,Sheets,Strips,Molded orExtruded Shapes33.Terminology3.1 Definitions:3.1.1 Definitions used in this test method are in accordancewith Terminology G40 as follows:3.1.2 abrasive wearwear due to hard particles or hardprotuberances forced against and moving along a solid surface.3.1.3 corrosive wearwear in which chemical or electro-chemical reaction with the environment is significant.3.1.4 abrasion-corrosiona synergistic process involvingboth abrasive wear and corrosion in which each of theseprocesses is affected by the simultaneous action of the otherand,in many cases is thereby accelerated.3.1.5 cumulative erosion-time curvea plot of cumulativeerosion versus cumulative exposure duration,usually deter-mined by periodic interruption of the test and weighing of thespecimen.This is the primary record of an erosion test.Mostother characteristics,such as the incubation period,maximumerosion rate,terminal erosion rate,and erosion rate-time curve,are derived from it.3.1.6 erosionprogressive loss of original material from asolid surface due to mechanical interaction between thatsurface and a fluid,a multi-component fluid,or impingingliquid or solid particles.3.1.7 erosion-corrosiona conjoint action involving corro-sion and erosion in the presence of a corrosive substance.3.1.8 instantaneous erosion ratethe slope of a tangent tothe cumulative erosion-time curve at a specified point on thatcurve.3.2 Definitions of Terms Specific to This Standard:3.2.1 mass concentrationthe mass of solid particles perunit mass of mixture,expressed in percent.1This test method is under the jurisdiction of ASTM Committee G02 on Wearand Erosion and is the direct responsibility of Subcommittee G02.30 on AbrasiveWear.Current edition approved Nov.1,2015.Published November 2015.Originallyapproved in 1982.Last previous edition approved in 2013 as G7507(2013).DOI:10.1520/G0075-15.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at serviceastm.org.For Annual Book of ASTMStandards volume information,refer to the standards Document Summary page onthe ASTM website.3Available from Standardization Documents Order Desk,Bldg.4 Section D,700Robbins Ave.,Philadelphia,PA 19111-5094,Attn:NPODS.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 3.2.2 Miller Numbera measure of slurry abrasivity asrelated to the instantaneous rate of mass loss of a standardmetal wear block at a specific time on the cumulative abrasion-corrosion time curve.3.2.3 SAR Numbera measure of the relative abrasionresponse of any material in any slurry,as related to theinstantaneous rate of mass-loss of a specimen at a specific timeon the cumulative abrasion-corrosion time curve,converted tovolume or thickness loss rate.3.2.4 slurrya mixture of solid particles in liquid,of such aconsistency as to be capable of being pumped like a liquid.3.2.5 slurry abrasivitythe relative tendency of a particularmoving slu