1、Designation:A476/A476M00(Reapproved 2014)Standard Specification forDuctile Iron Castings for Paper Mill Dryer Rolls1,2This standard is issued under the fixed designation A476/A476M;the number immediately following the designation indicates the yearof original adoption or,in the case of revision,the
2、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.Scope1.1 This specification covers ductile iron castings for use inpressure containing paper mill dryer rolls at temperatur
3、es up to450F 230C.1.2 No precise quantitative relationship can be stated be-tween the properties of the iron in various locations of the samecasting or between the properties of a casting and those of a testspecimen cast from the same iron(see Appendix X1).1.3 The values stated in either SI units or
4、 inch-pound unitsare to be regarded separately as standard.The values stated ineach system may not be exact equivalents;therefore,eachsystem shall be used independently of the other.Combiningvalues from the two systems may result in non-conformancewith the standard.1.3.1 ExceptionWithin the text,the
5、 SI units are shown inbrackets.2.Referenced Documents2.1 ASTM Standards:3A644 Terminology Relating to Iron CastingsE8 Test Methods for Tension Testing of Metallic MaterialsE10 Test Method for Brinell Hardness of Metallic MaterialsE94 Guide for Radiographic ExaminationE446 Reference Radiographs for S
6、teel Castings Up to 2 in.(50.8 mm)in Thickness3.Terminology3.1 Definitions for many terms common to iron castings arefound in Terminology A644.4.Ordering Information4.1 Orders for material purchased to the requirements of thisspecification should include the following information:4.1.1 Quantity,4.1.
7、2 Specification number and date of issue,4.1.3 Description of casting by pattern number or drawing,4.1.4 Heat treatment,if required(see 5.1),4.1.5 Type of test coupon(see 9.2),4.1.6 Certification,if required(see 13.1),4.1.7 Marking location(see 14.1),and4.1.8 Additional requirements.5.Heat Treatment
8、5.1 The castings may be stress relieved at a temperature notto exceed 1200F 650C.6.Chemical Requirements6.1 The castings shall conform to the following chemicalrequirements:Total carbon,min,%3.0Silicon,max,%3.0Phosphorus,max,%0.08Sulfur,max,%0.056.2 The castings shall have a carbon equivalent of 3.8
9、 to 4.5inclusive.NOTE1The carbon content equivalent is calculated as follows:Total carbon+0.3(silicon+phosphorus)6.3 The chemical analysis for total carbon shall be made oneither chilled cast pencil-type specimens or on thin wafersapproximately132in.0.8 mm thick,cut from test coupons.Drillings shall
10、 not be used due to attendant loss of graphite.7.Mechanical Properties7.1 The iron represented by test coupons shall conform totensile requirements prescribed in Table 1.7.2 The yield strength prescribed in Table 1 may be deter-mined by any of the approved procedures described in 7.3 ofTest Methods
11、E8.7.3 The Brinell hardness of the material shall be a minimumof 201 HB.Hardness tests shall be conducted in accordancewith Test Method E10,using a 3000-kgf load.The test may bemade on either the casting or on a test coupon representing thecasting.8.Workmanship,Finish,and Appearance8.1 The castings
12、shall conform to the dimensions on thedrawings furnished by the purchaser,or if no drawing has been1This specification is under the jurisdiction of ASTM Committee A04 on IronCastings and is the direct responsibility of Subcommittee A04.02 on Malleable andDuctile Iron Castings.Current edition approve
13、d April 1,2014.Published April 2014.Originallyapproved in 1962.Last previous edition approved in 2009 as A476/A476M-00(2009).DOI:10.1520/A0476_A0476M-00R14.2For ASME Boiler and Pressure Vessel Code Applications see related Specifi-cations SA-467 in Section II of that Code.3For referenced ASTM standa
14、rds,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 19428-295
15、9.United States1 provided,to the dimensions predicated by the pattern suppliedby the purchaser.Surfaces of the castings shall be free ofadhering sand.Runners,risers,fins,and other extraneous metalshall be removed.9.Sampling9.1 Test coupons shall be poured from the same iron as thecastings represente
16、d.9.2 Test coupons shall be cast either to the“Y”block sizeand shape shown in Fig.1 or to the dimensions of the 1-in.25-mm keel block shown in Fig.2.The type of test couponand,when selected,the size of the“Y”block shall be specifiedby the purchaser.9.3 The test coupons shall be cast in open molds made ofsuitable core sand with a minimum 112in.38 mm of sand forthe 1-in.25 mm size and 3 in.75 mm of sand for the 3-in.75-mm size.The coupons shall be left in the mold until black.9.4 Table 2 shows the