1、Designation: A 49 01 (Reapproved 2006)Standard Specification forHeat-Treated Carbon Steel Joint Bars, Microalloyed JointBars, and Forged Carbon Steel Compromise Joint Bars1This standard is issued under the fixed designationA49; the number immediately following the designation indicates the year of o
2、riginaladoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A superscriptepsilon (e) indicates an editorial change since the last revision or reapproval.This standard has been approved for use by agencies of the Department of
3、 Defense.1. Scope1.1 This specification covers heat-treated carbon steel jointbars, microalloyed joint bars, and forged compromise joint barsfor general use in standard railroad track.1.2 The joint bars may be used for the production ofinsulated joints.1.3 The values stated in inch-pound units are t
4、o be regardedas the standard. The values given in parentheses are forinformation only.2. Referenced Documents2.1 ASTM Standards:2A 29/A 29M Specification for Steel Bars, Carbon andAlloy,Hot-Wrought, General Requirements forA 370 Test Methods and Definitions for Mechanical Testingof Steel ProductsA 7
5、00 Practices for Packaging, Marking, and LoadingMethods for Steel Products for Shipment2.2 American Railway Engineering and Maintenance ofWay Association Manual for Railway Engineering33. Ordering Information3.1 Orders for joint bars under this specification shallinclude the following information as
6、 appropriate:3.1.1 Quantitynumber of pairs of bars,3.1.2 Typedesign or type bar along with section designa-tion and weight of rails being joined,3.1.3 Dimensionoverall length,3.1.4 Punchingtype (elliptical, oval, round, or combina-tions), size, number, location, spacing and elevation ofpunched holes
7、, with dimensional drawing if necessary,3.1.5 Head Easementif required, and3.1.6 Certification and Test Report Requirements (see11.1).4. Manufacture4.1 The steel shall be made by one or both of the followingprocesses: basic-oxygen or electric-furnace.4.1.1 The steel may be cast by a continuous proce
8、ss, or iningots.4.2 Heating and QuenchingQuenched carbon-steel jointbars and forged compromise joint bars shall be uniformlyheated for punching, slotting, shaping, and forging and subse-quently quenched. Maximum depth of decarburized layer offorged bars shall not exceed 0.040 in.4.3 Microalloyed joi
9、nt bars shall be produced from hotrolled steel sections. Bars shall be sheared or sawed cold, andholes shall be drilled. No reheating and quenching is required.5. Chemical Requirements5.1 The chemical composition of the quenched carbon-steeljoint bars and forged compromise joint bars determined aspr
10、escribed in 5.3 shall be within the limits shown in Table 1.5.2 The chemical composition of the microalloyed joint barsshall be agreed upon by the purchaser and the manufacturer.Microalloying shall be accomplished with columbium, vana-dium, and nitrogen, or combinations thereof.5.3 Heat or Cast Anal
11、ysisSeparate analysis shall be madefrom test samples representing one of the first three and one ofthe last three ingots or continuously cast blooms preferablytaken during the pouring of the heat. Determinations may bemade chemically or spectrographically. Any portion of the heat1This specification
12、is under the jurisdiction of ASTM Committee A01 on Steel,Stainless Steel and Related Alloys, and is the direct responsibility of SubcommitteeA01.01 on Steel Rails and Accessories.Current edition approved March 1, 2006. Published March 2006. Originallyapproved in 1915. Last previous edition approved
13、in 2001 as A 49 01.2For 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.3Available fromAmerican Railway Engineerin
14、g and Maintenance of WayAssn.,10003 Derekwood Lane, Suite 210, Lanham, MD 20706.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.meeting the chemical analysis requirements of Table 1 may beapplied. The first heat analysis shall be rec
15、orded as the officialheat analysis, but the purchaser shall have access to all ladleanalyses.Additionally, any material meeting the product analy-sis limits shown in Table 2 may be applied after testing suchmaterial in accordance with Specification A 29/A 29M.5.4 Product AnalysisWhen ladle tests are
16、 not available,finished material representing the heat may be product tested.The product analysis allowance beyond the limits of thespecified ladle analysis shall be within the limits for productanalyses specified in Table 2.5.4.1 An analysis may be made by the purchaser from asample taken from a fi
17、nished joint bar representing each heat orcast. The chemical composition thus determined shall conformto the requirements in Table 2.6. Tensile Requirements6.1 Properties:6.1.1 The material as represented by a tension test specimenshall conform to the tensile properties prescribed in Table 3.6.1.2 T
18、he yield point prescribed in Table 3 may be deter-mined by the drop of the beam or halt of the gage of the testingmachine, or by use of dividers. Where a definite yield point isnot exhibited, the yield strength method defined in 6.1.3 shallbe used.6.1.3 The yield strength prescribed in Table 3 shall
19、 bedetermined by a strain gage or extensometer reading to 0.0002in. (0.005 mm). Yield strength may be defined as the stress at0.5 % total strain under load or as the stress at 0.2 % offset. Themethod described in Test Methods and Definitions A 370 shallbe followed. After the yield point has been pas
20、sed, theextensometer may then be removed and the test continued todetermine the tensile strength.6.2 Test SpecimensThe tension test specimen shall betaken from the middle of the head at the center of a finishedjoint bar, and shall be machined to the form and dimensions fora standard round tension te
21、st specimen with 2-in., or 50-mmgage length as described in Test Methods and DefinitionsA 370.6.3 Number of TestsOne tension test shall be made fromeach lot of 1000 bars or less, but not less than one test fromeach heat or cast on each day in which bars are heated andquenched. For microalloyed bars,
22、 one tension test shall bemade from each heat or cast.6.4 Retests:6.4.1 If the results of the tension test of any test lot forquenched bars do not conform to the specified requirements,the manufacturer may retreat such lot not more than twice, inwhich case two additional tension tests shall be made
23、fromsuch lot, and both shall conform to the requirements specifiedin Table 3.6.4.2 If the results of the tension test for microalloyed barsdo not conform to the specified requirements, a retest may bemade on two random samples from the heat or cast, and bothshall conform to the requirements specifie
24、d in Table 3.6.4.3 If any test specimen fails because of mechanicalreasons such as failure of testing equipment or improperspecimen preparation, it may be discarded and another speci-men taken.7. Dimensions and Permissible Variations7.1 The joint bars shall be true to template and shallaccurately fi
25、t the rails for which they are intended.7.2 The joint bars shall be either sheared or sawed to length,punched to the dimensions specified by the purchaser andalignment adjusted, all subject to the permissible variationsprescribed in 7.3 and Table 4.7.3 Any variation from a straight line in a vertica
26、l planeshall be such as will make the bars high in the center.8. Workmanship, Finish, and Appearance8.1 The joint bars shall be straight subject to the variationprescribed in 7.3 and Table 4.8.2 The general appearance with respect to soundness andsurface finish shall be consistent with good commerci
27、al prac-tice as determined by ordinary visual inspection.9. Inspection9.1 The manufacturer shall afford the purchasers inspectorall reasonable facilities necessary to satisfy that the material isTABLE 1 Chemical RequirementsElement Composition, %Carbon 0.350.60Manganese, max 1.20Phosphorus, max 0.04
28、Sulfur, max 0.050TABLE 2 Product AnalysesAllowance Beyond Limits of Specified Chemical AnalysisPercent undermin limitPercent overmax limitCarbon 0.04 0.04Manganese 0.06 0.06Phosphorus . . . 0.008Sulfur . . . 0.008TABLE 3 Tensile Requirementsksi MPaTensile strength, min 100 690Yield point or yield st
29、rength,minimumA70 485Elongation in 2 in. or 50 mm, min,%12Reduction in area, min, % 25ADetermination by either the 0.2 % offset method or the 0.5 % extension-under-load method.TABLE 4 Permissible Variations in Dimensionsin. (mm)Specified size of holes 6 1/32 (0.8)Specified location of holes 6 1/16 (
30、1.6)Specified length of bar 6 1/8 (3.2)Maximum camber in either plane (see 7.3)24-in. (610-mm) bars 1/32 (0.8)36-in. (914-mm) bars 1/16 1.6)A 49 01 (2006)2being produced and furnished in accordance with the specifi-cation. Mill inspection by the purchaser shall not interfereunnecessarily with the ma
31、nufacturers operations. All tests andinspections shall be made at the place of manufacture, unlessotherwise agreed upon.10. Rejection and Rehearing10.1 Material that fails to conform to the requirements ofthis specification may be rejected. Rejections shall be reportedto the manufacturer or supplier
32、 promptly and in writing. In caseof dissatisfaction with the test results, the manufacturer orsupplier may make claim for a rehearing.11. Certification and Test Report11.1 When specified in the purchaser order or contract, amanufacturers certification shall be furnished to the purchaserthat the mate
33、rial was produced and tested in accordance withthis specification and has been found to meet the requirements.11.2 When specified in the purchaser order or contract, areport of the chemical and mechanical test results shall befurnished.11.3 A Material Test Report, Certificate of Inspection, orsimila
34、r document printed from or used in electronic form froman electronic data interchange (EDI) transmission shall beregarded as having the same validity as a counterpart printed inthe certifiers facility. The content of the EDI transmitteddocument must meet the requirements of the invoked ASTMstandard(
35、s) and conform to any existing EDI agreement be-tween the purchaser and the supplier.11.4 Notwithstanding the absence of a signature, the orga-nization submitting either a printed document (Material TestReport, Certificate of Inspection or similar document) or anEDI transmission is responsible for t
36、he content of the report.12. Product Marking12.1 The name or brand of the manufacturer, the sectiondesignation, and the year of manufacture shall be either rolledin raised letters and figures on the side of the rolled bars, anda portion of this marking shall appear on each finished joint baror hot s
37、tamped.12.2 For quenched bars, a serial number representing theheat or cast shall be hot stamped on the outside of the web ofeach bar, near one end.12.3 Each compromise joint bar shall also have the railsections shown at each end along with the word “gage” or“out” to indicate on which side of the ra
38、il the bar is to be used.(If the compromise joint bars are interchangeable, the words“gage” and “out” shall be omitted.)12.4 Bar Coding:12.4.1 The Automotive Industry Action Group (AIAG) BarCode Standard for Primary Metals for Steel Products may beconsidered as a possible auxiliary method of identif
39、ication. Useof this method shall be by agreement between purchaser andsupplier.13. U. S. Government Procurement13.1 When specified in the contract or purchase order,material shall be prepared for shipment and storage in accor-dance with the requirements of Practices A 700.14. Keywords14.1 joint bars
40、; rails; railway applications; steel railsASTM 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 t
41、he 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
42、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 hearing you shoul
43、dmake 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 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).A 49 01 (2006)3
