1、Designation: A524 96 (Reapproved 2012)Standard Specification forSeamless Carbon Steel Pipe for Atmospheric and LowerTemperatures1This standard is issued under the fixed designation A524; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revisi
2、on, the 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.1. Scope1.1 This specification2covers seamless carbon steel pipeintended primarily for service at atmospheric and
3、lowertemperatures, NPS18 to 26 inclusive, with nominal (average)wall thickness as given in ANSI B36.10. Pipe having otherdimensions may be furnished, provided such pipe complieswith all other requirements of this specification. Pipe orderedto this specification shall be suitable both for welding, an
4、d forbending, flanging, and similar forming operations.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 onlyand are not considered standard.NOTE 1The dimensionless design
5、ator NPS (nominal pipe size) hasbeen substituted in this standard for such traditional terms as “nominaldiameter,” “size,” and “nominal size.”1.3 The following hazard caveat applies to the test methodsportion, Section 16, only. This standard does not purport toaddress all of the safety concerns, if
6、any, associated with itsuse. It is the responsibility of the user of this standard toestablish appropriate safety and health practices and deter-mine the applicability of regulatory limitations prior to use.2. Referenced Documents2.1 ASTM Standards:3A530/A530M Specification for General Requirements
7、forSpecialized Carbon and Alloy Steel PipeE29 Practice for Using Significant Digits in Test Data toDetermine Conformance with Specifications2.2 American National Standards Institute Standard:B36.10 Welded and Seamless Wrought Steel Pipe43. Ordering Information3.1 Orders for material under this speci
8、fication shouldinclude the following, as required, to describe the desiredmaterial adequately:3.1.1 Quantity (feet or number of lengths),3.1.2 Name of material (seamless carbon steel pipe),3.1.3 Grade (Table 1 and Table 2),3.1.4 Manufacture (hot finished or cold drawn),3.1.5 Size (either nominal wal
9、l thickness and weight class orschedule number, or both, or outside diameter and nominalwall thickness, ANSI B36.10),3.1.6 Length (17),3.1.7 Optional requirements ( Section 8 and Section 11 ofSpecification A530/A530M),3.1.8 Test report required (Certification Section of Specifi-cation A530/A530M),3.
10、1.9 Specification designation,3.1.10 End use of material, and3.1.11 Special requirements.4. General Requirements4.1 Material furnished to this specification shall conform tothe applicable requirements of the current edition of Specifi-cation A530/A530M unless otherwise provided herein.5. Materials a
11、nd Manufacture5.1 Process:5.1.1 The steel shall be killed steel made by one or more ofthe following processes: open-hearth, electric-furnace, orbasic-oxygen.5.1.2 The steel shall be made to fine grain practice.5.1.3 Steel may be cast in ingots or may be strand cast.When steel of different grades are
12、 sequentially strand cast,identification of the resultant transition material is required.The producer shall remove the transition material by anyestablished procedure that positively separates the grades.1This specification is under the jurisdiction of ASTM Committee A01 on Steel,Stainless Steel an
13、d Related Alloys and is the direct responsibility of SubcommitteeA01.09 on Carbon Steel Tubular Products.Current edition approved March 1, 2012. Published November 2012. Originallyapproved in 1965. Last previous edition approved in 2005 as A524 96 (2005).DOI: 10.1520/A0524-96R12.2For ASME Boiler and
14、 Pressure Vessel Code Applications see related Specifi-cation SA-524 in Section II of that Code.3For 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 Docume
15、nt Summary page onthe ASTM website.4Available from American National Standards Institute, 11 West 42nd St., 13thFloor, New York, NY 10036.Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States15.1.4 Pipe NPS 112 and under may be either hot f
16、inished orcold drawn.5.1.5 Unless otherwise specified, pipe NPS 2 and over shallbe furnished hot finished. When agreed upon between themanufacturer and purchaser, cold-drawn pipe may be fur-nished.5.2 Heat TreatmentAll hot-finished and cold-drawn pipeshall be reheated to a temperature above 1550 F (
17、845C) andfollowed by cooling in air or in the cooling chamber of acontrolled atmosphere furnace.6. Chemical Composition6.1 The steel shall conform to the chemical requirementsprescribed in Table 1.7. Heat Analysis7.1 An analysis of each heat of steel shall be made by thesteel manufacturer to determi
18、ne the percentages of the ele-ments specified in Section 6. The chemical composition thusdetermined, or that determined from a product analysis madeby the manufacturer, if the latter has not manufactured thesteel, shall be reported to the purchaser or the purchasersrepresentative, and shall conform
19、to the requirements specifiedin Section 6.8. Product Analysis8.1 At the request of the purchaser, analyses of two pipesfrom each lot (Note 2) shall be made by the manufacturer fromthe finished pipe. The chemical composition thus determinedshall conform to the requirements specified in Section 6.NOTE
20、 2Alot shall consist of 400 lengths, or fraction thereof, for eachsize NPS 2 up to but not including NPS 6, and of 200 lengths, or fractionthereof, for each size NPS 6 and over.8.2 If the analysis of one of the tests specified in 8.1 doesnot conform to the requirements specified in 6, analyses shall
21、be made on additional pipe of double the original number fromthe same lot, each of which shall conform to requirementsspecified.9. Physical Properties9.1 Tensile PropertiesThe material shall conform to therequirements as to tensile properties prescribed in Table 2.9.2 Bending Properties:9.2.1 For pi
22、pe NPS 2 and under, a sufficient length of pipeshall stand being bent cold through 90 around a cylindricalmandrel, the diameter of which is twelve times the nominaldiameter of the pipe, without developing cracks. When orderedfor close coiling, the pipe shall stand being bent cold through180 around a
23、 cylindrical mandrel, the diameter of which iseight times the nominal diameter of the pipe, without failure.9.2.2 For pipe whose diameter exceeds 25 in. (635 mm) andwhose diameter to wall thickness ratio is 7.0 or less, bend testspecimens shall be bent at room temperature through 180without cracking
24、 on the outside of the bent portion. The insidediameter of the bend shall be 1 in. (25.4 mm). This test shall bein place of Section 10.NOTE 3Diameter to wall thickness ratio = specified outside diameter/nominal wall thickness.Example: For 28 in. diameter 5.000 in. thick pipe the diameter to wallthic
25、kness ratio = 28/5 = 5.6.10. Flattening Test Requirements10.1 For pipe over NPS 2, a section of pipe not less than 212in. (63.5 mm) in length shall be flattened cold between parallelplates until the opposite walls of the pipe meet. Flattening testsshall be in accordance with Specification A530/A530M
26、, exceptthat in the equation used to calculate the H value, the followinge constants shall be used:0.07 for Grade I0.08 for Grade II10.2 When low D-to-t ratio tubulars are tested, because thestrain imposed due to geometry is unreasonably high on theinside surface at the 6 and 12 oclock locations, cr
27、acks at theselocations shall not be cause for rejection if the D-to-t ratio isless than ten.11. Hydrostatic Test Requirements11.1 Each length of pipe shall be subjected to the hydro-static pressure, except as provided in 11.2.11.2 When specified in the order, pipe may be furnishedwithout hydrostatic
28、 testing and each length so furnished shallinclude with the mandatory marking the letters “NH.”11.3 When certification is required by the purchaser and thehydrostatic test has been omitted, the certification shall clearlystate “Not Hydrostatically Tested,” and the specification num-ber and grade des
29、ignation, as shown on the certification, shallbe followed by the letters “NH.”12. Dimensions and Weights12.1 The dimensions and weights of plain-end pipe areincluded in ANSI B36.10. Sizes and wall thicknesses mostgenerally available are listed in Appendix X1.13. Dimensions, Weight, and Permissible V
30、ariations13.1 WeightThe weight of any length of pipe shall notvary more than 6.5 % over and 3.5 % under that specified forpipe of Schedule 120 and lighter nor more than 10 % over and3.5 % under that specified for pipe heavier than Schedule 120.Unless otherwise agreed upon between the manufacturer an
31、dpurchaser, pipe in sizes NPS 4 and smaller may be weighed inconvenient lots; pipe in sizes larger than NPS 4 shall beweighed separately.13.2 DiameterVariations in outside diameter shall notexceed those specified in Table 3.TABLE 1 Chemical RequirementsElement Grades I and II, Composition, %Carbon,
32、max 0.21Manganese 0.901.35Phosphorus, max 0.035Sulfur, max 0.035Silicon 0.100.40A524 96 (2012)213.3 ThicknessThe minimum wall thickness at any pointshall not be more than 12.5 % under the nominal wall thicknessspecified.NOTE 4The minimum wall thickness on inspection is shown inAppendix X1.14. Workma
33、nship, Finish, and Appearance14.1 The pipe manufacturer shall explore a sufficient num-ber of visual surface imperfections to provide reasonableassurance that they have been properly evaluated with respectto depth. Exploration of all surface imperfections is notrequired but may be necessary to assur
34、e compliance with 14.2.14.2 Surface imperfections that penetrate more than 1212 %of the nominal wall thickness or encroach on the minimumwall thickness shall be considered defects. Pipe with suchdefects shall be given one of the following dispositions:14.2.1 The defect may be removed by grinding pro
35、videdthat the remaining wall thickness is within specified limits.14.2.2 Repaired in accordance with the repair weldingprovisions of 14.6.14.2.3 The section of pipe containing the defect may be cutoff within the limits of requirements on length.14.2.4 Rejected.14.3 To provide a workmanlike finish an
36、d basis for evalu-ating conformance with 14.2, the pipe manufacturer shallremove by grinding the following noninjurious imperfections:14.3.1 Mechanical marks, abrasions (Note 5), and pits, anyof which imperfections are deeper than116 in. (1.58 mm).NOTE 5Marks and abrasions are defined as cable marks
37、, dinges, guidemarks, roll marks, ball scratches, scores, die marks, and the like.14.3.2 Visual imperfections, commonly referred to as scabs,seams, laps, tears, or slivers, found by exploration in accor-dance with 14.1 to be deeper than 5 % of the nominal wallthickness.14.4 At the purchasers discret
38、ion, pipe shall be subject torejection if surface imperfections acceptable under 14.2 are notscattered, but appear over a large area in excess of what isTABLE 2 Tensile RequirementsWall ThicknessesGrade I, 0.375 in. (9.52 mm)and underGrade II, greater than 0.375 in.(9.52 mm)Tensile strength, psi (MP
39、a) 60 00085 000(414586)55 00080 000(380550)Yield strength, min, psi (MPa) 35 000 (240) 30 000 (205)Longitudinal Transverse Longitudinal TransverseElongation in 2 in. or 50 mm, min %:Basic minimum elongation for walls516 in. (7.9 mm) and over in thickness, striptests, and for all small sizes tested i
40、n full section30 16.5 35 25When standard round 2 in. or 50 mm gauge length test specimen is used for striptests, a deduction for each132 in. (0.8 mm) decrease in wall thickness below516 in. (7.9 mm) from the basic minimum elongation of the followingpercentage221.50A121.00A28.20.AThe following table
41、gives the computed minimum values:Wall Thickness Elongation in 2 in. or 50 mm, min, %Grade Iin. mm Longitudinal Transverse516 (0.312) 7.94 30.0 16.5932 (0.281) 7.14 28.5 15.514 (0.250) 6.35 27.0 14.5732 (0.219) 5.56 25.5 . . .316 (0.188) 4.76 24.0 . . .532 (0.156) 3.97 22.5 . . .18 (0.125) 3.18 21.0
42、 . . .332 (0.094) 2.38 19.5 . . .116 (0.062) 1.59 18.0 . . .NoteThe above table gives the computed minimum elongation values for each132-in. (0.79-mm) decrease in wall thickness. Where the wall thickness lies betweentwo values shown above, the minimum elongation value is determined by the following
43、equation:Grade Direction of Test EquationI transverse E = 32t + 6.50I longitudinal E = 48t + 15.00where:E = elongation in 2 in. or 50 mm in % andt = actual thickness of specimen, in. (mm).TABLE 3 Variations in Outside DiameterNPSDesignatorPermissible Variations in Outside Diameter, in. (mm)Over Unde
44、r18 to 112, incl164 (0.4)132 (0.8)Over 112 to 4, incl132 (0.8)132 (0.8)Over 4 to 8, incl116 (1.6)132 (0.8)Over 8 to 18, incl332 (2.4)132 (0.8)Over 1818 (3.2)132 (0.8)A524 96 (2012)3considered a workmanlike finish. Disposition of such pipe shallbe a matter of agreement between the manufacturer and th
45、epurchaser.14.5 When imperfections or defects are removed bygrinding, a smooth curved surface shall be maintained, and thewall thickness shall not be decreased below that permitted bythis specification. The outside diameter at the point of grindingmay be reduced by the amount so removed.14.5.1 Wall
46、thickness measurements shall be made with amechanical caliper or with a properly calibrated nondestruc-tive testing device of appropriate accuracy. In case of dispute,the measurement determined by use of the mechanical calipershall govern.14.6 Weld repair shall be permitted only subject to theapprov
47、al of the purchaser and in accordance with SpecificationA530/A530M.14.7 The finished pipe shall be reasonably straight.15. Number of Tests and Retests15.1 One of either of the tests specified in 9.1 shall be madeon one length of pipe from each lot (Note 2).15.2 For pipe NPS 2 and under, the bend tes
48、t specified in 9.2shall be made on one pipe from each lot (Note 2). The bendtests specified in 9.2.2 shall be made on one end of each pipe.15.3 The flattening test specified in 10 shall be made on onelength of pipe from each lot (Note 2).15.4 Retests shall be in accordance with SpecificationA530/A53
49、0M and as provided in 15.5 and 15.6.15.5 If a specimen breaks in an inside or outside surfaceflaw, a retest shall be allowed.15.6 Should a crop end of a finished pipe fail in theflattening test, one retest may be made from the broken end.16. Test Specimens and Methods of Testing16.1 Specimens cut either longitudinally or transverselyshall be acceptable for the tension test.16.2 Test specimens for the bend test specified in 9.2 and forthe flattening tests specified in 10 shall consist of sections cutfrom a pipe. Specimens for
