1、Designation:D404293(Reapproved 2014)Standard Test Method forSampling and Testing for Ash and Total Iron in Steel MillDispersions of Rolling Oils1This standard is issued under the fixed designation D4042;the number immediately following the designation indicates the year oforiginal adoption or,in the
2、 case of revision,the year of last revision.A number in parentheses indicates the year of last reapproval.Asuperscript epsilon()indicates an editorial change since the last revision or reapproval.1.Scope1.1 This test method describes a procedure for sampling andtesting dispersions of rolling oils in
3、 water from operating steelrolling mills for determination of ash and total iron content.Itspurpose is to provide a test method such that a representativesample may be taken and phenomenon such as iron separation,fat-emulsion separation,and so forth,do not contribute toanalytical error in determinat
4、ion of ash and total iron.1.2 The values stated in SI units are to be regarded as thestandard.The values given in parentheses are for informationonly.1.3 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 sta
5、ndard to establish appro-priate safety and health practices and determine the applica-bility of regulatory limitations prior to use.For specificwarning statements,see Sections 6 and 7.2.Referenced Documents2.1 ASTM Standards:2D482 Test Method for Ash from Petroleum ProductsD1068 Test Methods for Iro
6、n in WaterD1193 Specification for Reagent WaterD2795 Test Methods for Analysis of Coal and Coke Ash(Withdrawn 2001)3E50 Practices for Apparatus,Reagents,and Safety Consid-erations for Chemical Analysis of Metals,Ores,andRelated MaterialsE832 Specification for Laboratory Filter Papers3.Summary of Tes
7、t Method3.1 Polyethylene disposable sample bags in a suitable hold-ing device are used to collect representative samples ofnonhomogeneous dispersions of rolling mill oils in water froman operating mill coolant system.3.2 The collected sample and disposable bag are analyzed asone for ash and total ir
8、on.3.2.1 Ash content is determined gravimetrically by evapo-rating all water from the sample bag before heating the residueand bag in a muffle furnace to a constant weight(Test MethodD482).3.2.2 Total iron content is determined by digesting the ironin the ashed sample and bag in an acidified solutio
9、n.The ironin the solution is reduced with stannous chloride and titratedwith standardized potassium dichromate.3.2.3 The ash and total iron contributed by a sample bagalone are determined separately and are subtracted from thevalues of bag and sample to obtain the values for the samplealone.NOTE1The
10、re are a number of alternative methods available fordetermining total iron in an ashed solution such as Test Methods D2795and D1068.4.Significance and Use4.1 The life cycle and cleanliness of a recirculating steelmill rolling oil dispersion is affected by the amount of ironpresent.This iron consists
11、 mainly of iron from acid picklingresidues and iron from attrition of the steel sheet or rolls duringcold rolling.In sampling rolling oils for total iron it is difficultto prevent adherence of iron containing sludge to the samplecontainer.Thus,the accuracy of a total iron determination froman aliquo
12、t sample is suspect.This practice provides a means forensuring that all iron contained in a sample is included in theanalysis.4.2 Although less significant,the ash content is still anessential part of the procedure for obtaining a total ironanalysis.Generally,the ash will be mostly iron,and in manyc
13、ases,could be used as a substitute for total iron in determiningwhen to change the dispersion.5.Sampling5.1 Apparatus:1This test method is under the jurisdiction of ASTM Committee D02 onPetroleum Products,Liquid Fuels,and Lubricants and is the direct responsibility ofSubcommittee D02.L0.04 on Metal
14、Deformation Fluids and Lubricants.Current edition approved May 1,2014.Published July 2014.Originally approvedin 1981.Last previous edition approved in 2009 as D4042 93(2009).DOI:10.1520/D4042-93R14.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at
15、serviceastm.org.For Annual Book of ASTMStandards volume information,refer to the standards Document Summary page onthe ASTM website.3The last approved version of this historical standard is referenced onwww.astm.org.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA
16、19428-2959.United States1 5.1.1 Disposable Plastic(Polyethylene)Sampling Bags4177and 473 cm3(6 and 16 oz)complete with closure wire.5.1.2 Holding Fixture.NOTE2A plastic baby bottle holder with an open 177-cm3(6-oz)sampling bag inserted makes a suitable holder.5.1.3 Sampling Cup and Handle.NOTE3Ahockey stick or similar formed apparatus of steel,plastic,orwood with or without a separate cup can be used to hold the holdingfixture or the fixture itself can be attached to the handle(see Fig.1).5.2 Sa
