ASTM_A_644_-_14.pdf

Designation:A64414Standard Terminology Relating toIron Castings1This standard is issued under the fixed designation A644;the number immediately following the designation indicates the year oforiginal adoption or,in the 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.This standard has been approved for use by agencies of the U.S.Department of Defense.ausferrite,na cast iron matrix microstructure,produced by acontrolled thermal process,which consists of predominantlyacicular ferrite and high carbon austenite.(See austemperedductile iron.)austempered ductile iron,na ductile cast iron that has beenproduced by a controlled thermal process which results in amatrix microstructure consisting of predominately acicularferrite and high carbon austenite.austenitize,vtto convert the matrix of a ferrous alloy toaustenite by heating above the transformation temperature.batch,nthe component raw materials properly weighed,proportioned,and mixed for delivery to a processing unit.Also,the product output from a processing unit in whichthere is essentially no product output until all componentmaterials are charged and processed.brittle fracture,nfracture that occurs without appreciableplastic deformation of the material.brittle fracture area,nThe fraction or percent of thefracture surface that formed by brittle fracture.(Whenobserved with no or low magnification,brittle fractureappears whiter and shinier than ductile fracture.)capability index(Cp),nfor a stable process,the specificationrange divided by six times the standard deviation.Cp5USL2 LSL!6 3scapability index(Cpk),nfor a stable process,the smaller ofthe upper capability index(CPU)or the lower capabilityindex(CPL).carbide,primary,ncarbide precipitated in cast iron duringsolidification.cast iron,na generic term for a series of alloys primarily ofiron,carbon,and silicon in which the carbon is in excess ofthe amount which can be retained in solid solution inaustenite at the eutectic temperature.cementite,na very hard and brittle compound of iron andcarbon corresponding to the empirical formula Fe3C,com-monly known as iron carbide.cementite,primary,ncementite precipitated in cast ironduring solidification.Also known as primary carbide.(Seecementite.)center stop,nan integral part of the gasket,centered at itsaxial length,intended to limit the insertion depth of the pipeor fitting,or both,to be coupled.certification,nA document supplied by the maker or manu-facturer of a product which testifies to the factuality or truthof statements made that the requirements of a productstandard have been met.chill,nan object,usually metal,imbedded in a portion of themold to accelerate the local rate of heat removal from themetal being cast.chill,vto accelerate the freezing rate of cast iron,usually ina localized region,to refine the graphite structure or causeformation of primary carbides.chill,microstructural,na localized region of primary car-bides in a casting made from a cast iron that would normallysolidify free of primary carbides.chilled iron,na cast iron that would normally solidify free ofprimary carbide which is purposely caused to solidify aswhite cast iron,locally or entirely,by accelerated pacted graphite iron,na cast iron that has been treatedin the liquid state so as to cause its graphitic carbon to occurin the compacted graphite shape in the as-cast condition.(See graphite,compacted and graphite,spheroidal.)compound,nan intimate mixture of all the ingredientsnecessary for a finished material or pression gasket,na gasket designed to be used pression seal,na seal that is attained by a compressiveforce on the sealing material.1This terminology is under the jurisdiction of ASTM Committee A04 on IronCastings and is the direct responsibility of Subcommittee A04.91 on EditorialMatters and Nomenclature.Current edition approved Oct.1,2014.Published October 2014.Originallyapproved in 1971.Last previous edition approved in 2013 as A644-13.DOI:10.1520/A0644-14.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 confidence level,nthe probability,or expected percent of thetimes,that the selected percent(P%)of the actual popula-tion lies within the tolerance interval calculated from thedata sample.coupling,nthe complete clamp,shield and gasket assembly.coupling,push-on type,na coupling utilizing a fixed gasketwhere assembly of the joint is accomplished without remov-ing the shield.direct reduced iron,niron ores that have been reduced toessentially metallic iron by heat and reducing agents,butwithout melting,and processed into suitable shapes(typi-cally pellets)for use as a charge material in a meltingoperation.dual metal,ntwo metals of different composition that arefusion bonded at all interfacial surfaces by casting metal ofone composition against metal of a second composition.ductile fr