ASTM_A_126_-_04_2014.pdf

Designation:A12604(Reapproved 2014)Standard Specification forGray Iron Castings for Valves,Flanges,and Pipe Fittings1This standard is issued under the fixed designation A126;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.1.Scope1.1 This specification covers three classes of gray iron forcastings intended for use as valve pressure retaining parts,pipefittings,and flanges.1.2 The values stated in inch-pound units are to be regardedas standard.The values given in parentheses are mathematicalconversions to SI units that are provided for information onlyand are not considered standard.NOTE1The text of this standard references notes and footnotes whichprovide explanatory material.These notes and footnotes(excluding thosein tables and figures)shall not be considered as requirements of thestandard.2.Referenced Documents2.1 ASTM Standards:2A48/A48M Specification for Gray Iron CastingsA644 Terminology Relating to Iron CastingsE8 Test Methods for Tension Testing of Metallic Materials3.Terminology3.1 Definitions of many terms common to gray iron castingsare found in Terminology A644.4.Classification4.1 Castings produced to this specification are classifiedbased upon the minimum tensile strength of the iron(see Table1).5.Ordering Information5.1 Orders for material in this specification should includethe following information:5.1.1 ASTM designation and year date,5.1.2 Class of iron required,5.1.3 Quantity,and5.1.4 Certification,if required(see Section 17).6.Workmanship,Finish,and Appearance6.1 The castings shall be made in a workmanlike mannerand the surface shall be free of adhering sand,scale,cracks,and hot tears as determined by visual examination.7.Chemical Requirements7.1 A chemical analysis shall be performed on each lot andshall conform to the following requirements for phosphorusand sulfur:Phosphorus,max,%0.75Sulfur,max,%0.157.2 The chemical analysis shall be performed on a sampleobtained during the pouring of the lot.8.Tensile Properties8.1 One tension test shall be performed on each lot and shallconform to the mechanical properties specified inTable 1.9.Cast Test Bars9.1 Separately cast 118in.(28.6 mm)diameter test barsshown in Fig.1 shall be poured in sand molds from the samelot as the castings represented.NOTE2The numbering on the test specimens shown in Fig.1 and Fig.2 is intended simply to illustrate a method of designation.In the particularmethod shown12refers to December 8,B1 is the cupola number,and thenumeral 1 which follows shows the hour cast(1 p.m.).9.2 Test bars that are intended to represent castings whichare cooled in the mold to less than 900F(480C)beforeshakeout,shall be cooled in their molds to a temperature lessthan 900F,and then may be cooled in still air to roomtemperature.9.3 Test bars that are intended to represent castings whichare hotter than 900F when shaken out of their molds,shall becooled as described in 9.2 or(by agreement between themanufacturer and the purchaser)may be shaken out of theirmolds at approximately the same temperature as the castingsthey represent.1This specification is under the jurisdiction of ASTM Committee A04 on IronCastings and is the direct responsibility of Subcommittee A04.01 on Grey and WhiteIron Castings.Current edition approved April 1,2014.Published April 2014.Originallyapproved in 1929.Last previous edition approved in 2009 as A126 04(2009).DOI:10.1520/A0126-04R14.2For 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.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 10.Tension Test Apparatus10.1 Ball and socket specimen holders or spherical-seatedbearings or other device which will ensure that the specimen,when under load,will be as nearly as possible in pure axialtension without transverse stress shall be used in making thetension test.NOTE3Suitable socket specimens holders and spherical-seated bear-ing device are shown in Fig.4 and described in 5.2.3 of Test Methods E8.10.2 After reaching a stress of 15 000 psi(103 MPa),thespeed of the crosshead of the testing machine shall not exceed18in.(3.2 mm)/min.11.Sampling11.1 A lot shall consist of one of the following:11.1.1 All the metal poured from a single heating in a batchtype melting furnace,11.1.2 All the metal from two or more batch type meltingfurnaces poured into a single ladle or single casting,or11.1.3 All the metal poured from a continuous meltingfurnace for a given period of time between changes in charge,processing conditions,or aim-fo