1、Designation: A126 04 (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
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 U.S. Department of Defense.1. Scope1.1 This specification cove
3、rs 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 o
4、nlyand 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/
5、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 specificati
6、on 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
7、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
8、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 shall
9、conform 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
10、 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) beforesh
11、akeout, 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 th
12、emanufacturer 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 Casti
13、ngs.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. Fo
14、r 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 States110. Tension Test Apparatus10.1 Ball and socket specimen holders or sphe
15、rical-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.NOTE 3Suitable socket specimens holders and spherical-seated bear-ing device are shown in Fig
16、. 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 lot shall consist of one of the following:11.1.1 All the metal poured from a single heating in a
17、 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-for chemistry or
18、 4 h, whicheveris the shorter period.11.1.3.1 The purchaser may agree to extend the 4-h timeperiod to8hifthemanufacturer can 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
19、 Fig. 2. The cross-sectionalMetric Equivalentsin.1814123478 118 1.2 1932 112 134 234 13mm 3.2 6.4 12.7 19.0 22.2 28.6 30.5 32.5 38.1 44.4 69.8 1330NOTE 1These dimensions are suggested as satisfactory for average conditions, but may be varied to best suit individual pouring.FIG. 1 Mold of Tension and
20、 Transverse Test SpecimensMetric Equivalentsin. mm in. mm118 28.6 334 95.2134 44.4 558 142.9178 47.6 712 290.5NOTE 1Modification may be made to the grip-ends of the tension test specimen to allow alternative means of gripping as required by testingprocedures and equipment. Should alternative grip-en
21、ds be disputed, the threaded grip-ends shall be used.FIG. 2 Tension Test SpecimenTABLE 1 Tensile RequirementsClass A Class B Class CTensile strength, min, ksi(MPa)21 (145) 31 (214) 41 (283)A126 04 (2014)2area of the reduced section shall be 1 in.2(645 mm2) 65%.The actual cross-sectional area shall b
22、e 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 t
23、ested 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 themanufacture
24、r. 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.However,
27、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 ir
28、on 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 ri
29、skof 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 th
30、is 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 shouldmake
31、 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 by
32、 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 (2014)3
