1、Designation: A126 04 (Reapproved 2009)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
2、 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 Department of Defense.1. Scope1.1 This specification covers th
3、ree 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 onlyan
4、d are not considered standard.NOTE 1The 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
5、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 ar
6、e 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 requi
7、red (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
8、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 shallconfo
9、rm to the mechanical properties specified inTable 1.9. Cast Test Bars9.1 Separately cast 118 in. (28.6 mm) diameter test barsshown in Fig. 1 shall be poured in sand molds from the samelot as the castings represented.NOTE 2The numbering on the test specimens shown in Fig. 1 and Fig.2 is intended simp
10、ly 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) beforeshakeou
11、t, 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 be1This specification is under the jurisdiction of ASTM Commi
12、ttee A04 on IronCastings and is the direct responsibility of SubcommitteeA04.01 on Grey and WhiteIron Castings.Current edition approved Oct. 1, 2009. Published January 2010. Originallyapproved in 1929. Last previous edition approved in 2004 as A126 04. DOI:10.1520/A0126-04R09.2For referenced ASTM st
13、andards, 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.TABLE 1 Tensile RequirementsClass A Class B Class CTensile strength, min, ksi(MPa)21
14、 (145) 31 (214) 41 (283)1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.cooled 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 t
15、he castingsthey represent.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 t
16、est.NOTE 3Suitable 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 exceed18 in. (3.2 mm)/min.11. Sampling11.1 A
17、 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 fo
18、r a given period of time between changes in charge,processing conditions, or aim-for chemistry or 4 h, whicheveris the shorter period.Metric Equivalentsin. 1/81/41/23/47/811/81.219/32 1 1/213/423/413mm 3.2 6.4 12.7 19.0 22.2 28.6 30.5 32.5 38.1 44.4 69.8 1330NOTEThese dimensions are suggested as sat
19、isfactory for average conditions, but may be varied to best suit individual pouring.FIG. 1 Mold of Tension and Transverse Test SpecimensMetric Equivalentsin. mm in. mm11/8 28.6 3 3/4 95.213/4 44.4 5 5/8 142.917/8 47.6 7 1/2 290.5NOTEModification may be made to the grip-ends of the tension test speci
20、men to allow alternative means of gripping as required by testing proceduresand equipment. Should alternative grip-ends be disputed, the threaded grip-ends shall be used.FIG. 2 Tension Test SpecimenA126 04 (2009)211.1.3.1 The purchaser may agree to extend the 4-h timeperiod to8hifthemanufacturer can
21、 demonstrate sufficientprocess control to warrant such an extension.12. Test Specimens12.1 Tension test specimens shall have threaded ends andconform to the dimensions shown in Fig. 2. The cross-sectionalarea of the reduced section shall be 1 in.2(645 mm2) 65 %. Theactual cross-sectional area shall
22、be used in calculating thetensile strength.13. Alternate Test Bars13.1 Alternate test bars poured in accordance with Specifi-cation A48/A48M to the equivalent classes shown in Table 2may be substituted for the Specification A126 test bars. Whenthe alternate bars are used, they shall be machined and
23、tested inaccordance with Specification A48/A48M and shall meet therequirements of Specification A48/A48M.14. Inspection14.1 All tests and inspections required by this specificationshall be performed by the manufacturer or other reliablesources whose services have been contracted for by themanufactur
24、er. Complete records of all tests and inspectionsshall be maintained by the manufacturer and shall be availablefor review by the purchaser.15. Rejection and Rehearing15.1 Castings which fail to conform to the requirementsspecified when inspected or tested by the purchaser or his agentmay be rejected
25、. Rejection shall be reported to the manufac-turer or supplier promptly and in writing. In case of dissatis-faction with the test results, the manufacturer or supplier maymake claim for a rehearing.16. Certification16.1 When requested by the purchaser, the manufacturershall furnish the certification
26、 stating that the material wasmanufactured, sampled, tested, and inspected in accordancewith Specification A126, including the year date. The certifi-cation shall also include the results of all tests performedincluding chemical analysis.16.2 A signature is not required on the certification. How-eve
27、r, the document shall clearly identify the organizationsubmitting the certification and the authorized agent of themanufacturer who certified the test results. Notwithstandingthe absence of a signature, the organization submitting thecertification is responsible for its content.17. Keywords17.1 gray
28、 iron castings; pressure retaining partsASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mentionedin this standard. Users of this standard are expressly advised that determination of the validity of any such patent rights, and the
29、 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 reviewed every five years andif not revised, either reapproved or withdrawn. Your comments are invited either for revision of
30、 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 hearing you shouldm
31、ake your views known to the ASTM Committee on Standards, at the address shown below.This standard is copyrighted by ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959,United States. Individual reprints (single or multiple copies) of this standard may be obtained
32、 by contacting ASTM at the aboveaddress or at 610-832-9585 (phone), 610-832-9555 (fax), or serviceastm.org (e-mail); or through the ASTM website(www.astm.org). Permission rights to photocopy the standard may also be secured from the ASTM website (www.astm.org/COPYRIGHT/).TABLE 2 Equivalent Classes (Specification A48/A48M)SpecificationA126 ClassUnder 0.50 in.(12.7 mm)0.51 to 1.00 in.(13.0 to 25.4 mm)Over 1 in.(25.4 mm)A25A20B20CB333C444A126 04 (2009)3
