1、Designation: A 571/A 571M 01 (Reapproved 2006)Standard Specification forAustenitic Ductile Iron Castings for Pressure-ContainingParts Suitable for Low-Temperature Service1This standard is issued under the fixed designationA571/A571M; the number immediately following the designation indicates the yea
2、rof original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval.A superscript epsilon (e) indicates an editorial change since the last revision or reapproval.1. Scope1.1 This specification2covers austenitic ductile iron, Typ
3、eD-2M, Classes 1 and 2, for compressors, expanders, pumps,valves, and other pressure-containing parts intended primarilyfor low-temperature service.1.2 These grades of austenitic ductile iron are characterizedby having their graphite substantially in a spheroidal form andfree of flake graphite. They
4、 are essentially free of carbides andcontain sufficient alloy content to produce a stable austeniticmatrix down to 423F 252C (liquid hydrogen).1.3 The values stated in either inch-pound or SI units are tobe regarded separately as standard. Within the text, the SI unitsare shown in brackets. The valu
5、es stated in each system are notexact equivalents; therefore, each system shall be used inde-pendently of the other. Combining values from the two systemsmay result in nonconformance with the specification.1.4 The following precautionary caveat pertains only to thetest methods portion, Section 11, o
6、f this specification: Thisstandard does not purport to address all of the safety concerns,if any, associated with its use. It is the responsibility of the userof this standard to establish appropriate safety and healthpractices and determine the applicability of regulatory limita-tions prior to use.
7、2. Referenced Documents2.1 ASTM Standards:3A 941 Terminology Relating to Steel, Stainless Steel, Re-lated Alloys, and FerroalloysE8 Test Methods for Tension Testing of Metallic MaterialsE23 Test Methods for Notched Bar Impact Testing ofMetallic MaterialsE30Test Methods for Chemical Analysis of Steel
8、, CastIron, Open-Hearth Iron, and Wrought IronE59 Practice for Sampling Steel and Iron for Determinationof Chemical Composition43. Ordering Information3.1 Orders for material under this specification shall includethe following information:3.1.1 Quantity (weight or number of pieces),3.1.2 ASTM design
9、ation and year of issue,3.1.3 Material class (Table 1),3.1.4 Impact test temperature requirement (Section 11),3.1.5 Place of inspection (Section 13), and3.1.6 Certification requirements (Section 14).4. Materials and Manufacture4.1 MaterialThe iron shall be made in the electric-arcfurnace, induction
10、furnace, cupola, or any other furnace whichis capable of producing castings meeting the chemical compo-sitions and mechanical properties in this specification.4.2 Heat Treatment:4.2.1 All castings shall be heat treated.4.2.2 Heat treatment shall be performed before machiningexcept in instances when
11、reheat treating is necessary.4.2.3 Heat treatment shall consist of annealing. The proce-dure for this type treatment shall consist of heating the castingto a minimum of 1600F 870C but not greater than 1800F980C holding at that temperature not less than 1 h/in. 1 h/25mm of section and furnace cooling
12、. (See TerminologyA 941.)5. Chemical Requirements5.1 Drillings taken from test coupons, broken test speci-mens or castings shall conform to the requirements as tochemical composition prescribed in Table 2.5.2 The chemical analysis for total carbon shall be made oneither chilled cast pencil-type spec
13、imens or thin wafers ap-proximately132-in. 0.8-mm thick cut from test coupons.Drillings shall not be used because of attendant loss ofgraphite.1This specification is under the jurisdiction of the ASTM Committee A04 onIron Castings and is the direct responsibility of Subcommittee A04.02 on Malleablea
14、nd Ductile Iron Castings.Current edition approved June 1, 2006. Published June 2006. Originallyapproved in 1966. Last previous edition approved in 2001 as A 571/A 571M 01.2For ASME Boiler and Pressure Vessel Code applications see related Specifi-cation SA-571 in Section II of that code.3For referenc
15、ed 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.4Withdrawn.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C7
16、00, West Conshohocken, PA 19428-2959, United States.6. Physical Property Requirements6.1 Tensile PropertiesThe room temperature mechanicalproperties of the two classes of ductile iron used for the castingshall conform to the requirements for the heat-treated conditionshown in Table 1.6.2 Impact Prop
17、ertiesThe notched-bar impact propertiesof the materials shall be determined by testing a set of threeCharpy V-notch impact specimens to the energy absorptionrequirements shown in Table 1. The test temperature shall beagreed upon by the manufacturer and the purchaser.The energyabsorption value shown
18、in Table 1 are applicable at tempera-tures down to and including 320F 195C.6.3 Brinell HardnessThe room temperature hardness oftest bars and castings shall conform to the requirements ofTable 1.7. Workmanship, Finish, and Appearance7.1 The castings shall conform to the dimensions andtolerances on th
19、e drawings furnished by the purchaser, or if nodrawing has been provided, to the dimensions predicated bythe pattern supplied by the purchaser. The castings shall be freefrom injurious defects. Surfaces of the castings shall be free ofburnt-on sand and shall be reasonably smooth. Runners, risers,fin
20、s, and other useless cast-on pieces shall be removed. In otherrespects the castings shall conform to whatever points may bespecifically agreed upon between the manufacturer and thepurchaser.8. Sampling8.1 The standard test coupons shall be the 1-in. 25-mm“Y” block and 1-in. 25-mm keel block as shown
21、 in Fig. 1 andFig. 2, respectively.8.2 The separately cast test coupons from which the tensiontest specimens are machined shall be cast to the size and shapeshown in Fig. 1 or Fig. 2. The size of coupon cast to representthe casting shall be at the option of the purchaser. In case nooption is express
22、ed, the manufacturer shall make the choice.8.3 Test coupons shall be poured immediately after thecastings and from the same ladle of metal. Test coupons shallbe left in the mold until they have cooled black. Test couponsshall be included in the same furnace load as the castings theyrepresent (see Fi
23、g. 3).9. Number of Tests and Retests9.1 Test coupons shall be poured from each ladle treatedwith nodulizing agent unless otherwise specified.9.2 The number of representative coupons poured and testedshall be established by the manufacturer, unless otherwiseagreed upon with the purchaser.9.3 One tens
24、ion test at room temperature and three impacttests at the required temperature shall be performed from eachladle treated with nodulizing agent unless otherwise specified.TABLE 1 Mechanical Property RequirementsAClass 1 Class 2 Class 3 Class 4Tensile Strength, min, ksi mPa 65 60 450 415Yield Strength
25、 0.2 % (offset), min, ksi mPaB30 25 205 170Elongation, min, % 30 25 30 25Brinell Hardness, 3000 kg kgf 121171 111171 121171 111171Charpy V-notch, ftlbf Jmin, average 3 tests 15 20 20 27min, individual testC12 15 16 20AHeat-treated condition.BYield Strength shall be determined at 0.2 % offset by the
26、offset method, see Test Methods E8. Other methods may be agreed upon by mutual consent of manufacturerand purchaser.CNot more than one test in a set of three may be below the minimum average required for the set of three.TABLE 2 Chemical RequirementsElement Composition, %Total carbon 2.22.7ASilicon
27、1.52.50Manganese 3.754.5Nickel 21.024.0Chromium 0.20 maxBPhosphorus 0.08 maxAFor castings with sections under14 in. 6 mm, it may be desirable to adjust thecarbon upwards to a maximum of 2.90 %.BNot intentionally added.“Y Block Size“Y” Block SizeDimen-sionsFor Castingsof ThicknessLess Than12in. 12.5
28、mmFor Castingsof Thickness12 to 112 in.12.5 to 40 mmFor Castingsof Thicknessof 112 in. 40 mmand Overin. mm in. mm in. mmA12 12.5 1 25 3 75B 1 25 218 55 5 125C 2 50 3 75 4 100D 4 100 6 150 8 200E 7 175 7 175 7 175approx approx approxF916 14 1116 27 3116 78G718 180 718 180 718 180approx approx approxF
29、IG. 1 “Y” Blocks for Test CouponsA 571/A 571M 01 (2006)29.4 If any test specimens (tension or impact) show obviousfoundry defects, another specimen may be cut from the sametest coupon or from another test coupon representing the samemetal. The manufacturer may reheat treat castings, but onlyonce wit
30、hout requiring approval of the purchaser, if the testresults do not conform to the requirements specified.9.5 Failure of the retest specimen to conform to thisspecification shall be cause for rejection of the castings thatthey represent.10. Specimen Preparation10.1 Tension test specimens shall be th
31、e standard roundspecimen with 2-in. 50-mm gage length (Fig. 4) except whenthe12-in. 12.5-mm “Y” block is being used. In this case,either of the test specimens shown in Fig. 5 shall be satisfac-tory.10.2 Impact test specimens shall be machined to the formshown for Type A in Test Methods E23.11. Test
32、Methods11.1 Chemical AnalysisAll chemical analyses shall bemade in accordance with the following methods: Practice E59,and Test Methods E30, or by spectrographic methods. Shoulda dispute arise concerning the chemical composition whenspectrographic techniques are used, the methods specified inPractic
33、e E59and Test Methods E30shall be used as umpiremethods.11.2 Impact Test:11.2.1 The notched-bar impact test shall be made in accor-dance with the procedure for the simple beam Type A Charpytest described in Test Methods E23.11.2.2 In particular, impact tests at these low temperaturesshould be made w
34、ith the following precautions: The impact testspecimens as well as the handling tongs shall be cooled asufficient time in a suitable container so that both reach thedesired temperature. The temperature shall be measured withthermocouples, thermometers, or any other suitable devicesand shall be contr
35、olled within 610F 6C. The specimensshall be quickly transferred from the cooling device to the anvilNOTEThe length of the keel block shall be 6 in. 150 mm.Keel Block DimensionsDimensions in. mmA212 60B112 40C12 13D125FIG. 2 Keel Block for Test Coupons(a)12-in. 12.5-mm “Y”-BlockTwo blanks for 0.252-i
36、n. 6.5-mm diameter tension test specimens.(b) 1-in. 25-mm “Y”-BlockTwo blanks for 0.50-in. 12.5-mm diam-eter tension test specimens or impact specimens.(c) 3-in. 75-mm “Y”-BlockTwo blanks for 0.50-in. 12.5-mm diam-eter tension test specimens and two blanks for impact specimens.FIG. 3 Sectioning Proc
37、edure for “Y” BlocksA 571/A 571M 01 (2006)3of the Charpy impact testing machine and broken with a timelapse of not more than 5 s.12. Special Tests12.1 Hydrostatic Pressure Tests:12.1.1 Each pressure-containing casting, where practicable,shall be tested after machining to the test pressure specified
38、byany applicable code and shall show no leaks. Castings orderedunder this specification not covered by any pertinent specifi-cation and castings ordered for special service applicationsshall be tested to such pressures as may be established by thepurchaser.12.1.2 Although the foundry cannot always p
39、erform therequired pressure testing on unmachined castings, they shall beresponsible for the satisfactory performance of the castingsunder the final tests required in 12.1.1.12.2 Additional Tests:12.2.1 Radiographic standards, fracture tests, microstruc-ture standards, liquid penetrant tests, or any
40、 other special testsmay be required when so specified in the inquiry, contract ororder and when mutually agreed upon by the manufacturer andpurchaser.12.2.2 Due to the very low magnetic permeability of thismaterial, the magnetic particle inspection test is not an accept-able method of qualification.
41、13. Inspection13.1 The inspector representing the purchaser shall haveentry at all times, while work on the contract of the purchaseris being performed, to all parts of the manufacturers workswhich concern the manufacture of the materials ordered. Themanufacturer shall afford the inspector all reaso
42、nable facilitiesto satisfy him that the material is being furnished in accordancewith this specification. Unless otherwise specified, all tests andinspection shall be made at the place of manufacture prior toshipment, and shall be so conducted as not to interfereunnecessarily with the operation of t
43、he works.14. Certification14.1 When agreed upon in writing by the purchaser and theseller, a certification shall be made the basis of acceptance ofthe material. This shall consist of a copy of the manufacturerstest report or a statement by the seller, accompanied by a copyof the test results, that t
44、he material has been tested andinspected in accordance with the provisions of this specifica-tion. Each certification so furnished shall be signed by anauthorized agent of the seller or manufacturer.NOTEThe gage length fillets shall be as shown but the ends may be ofany shape to fit the holders of t
45、he testing machine in such a way that theload shall be axial. The reduced section shall have a gradual taper from theends toward the center, with the ends 0.003 to 0.005 in. 0.08 to 0.13 mmlarger in diameter than the center.FIG. 4 Standard Round Tension Test Specimen with 2-in. 50-mmGage LengthNOTEI
46、f desired, the length of the reduced section may be increased toaccommodate an extensometer.FIG. 5 Examples of Small-Size Specimens Proportional toStandard12-in. 12.5-mm Round SpecimenA 571/A 571M 01 (2006)4APPENDIX(Nonmandatory Information)X1. Y-BLOCK SELECTIONX1.1 As a general guide for selection
47、of the properY-block,the tabulation in Table X1.1, based on coolingrates, shows, forvarious test coupons, the equivalent geometric shapes withvarious dimensions.ASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mentionedin this sta
48、ndard. Users of this standard are expressly advised that determination of the validity of any such patent rights, and the riskof infringement of such rights, are entirely their own responsibility.This standard is subject to revision at any time by the responsible technical committee and must be revi
49、ewed every five years andif not revised, either reapproved or withdrawn. Your comments are invited either for revision of this standard or for additional standardsand should be addressed to ASTM International Headquarters. Your comments will receive careful consideration at a meeting of theresponsible technical committee, which you may attend. If you feel that your comments have not received a fair he
