1、Designation: A523 96 (Reapproved 2012)Standard Specification forPlain End Seamless and Electric-Resistance-Welded SteelPipe for High-Pressure Pipe-Type Cable Circuits1This standard is issued under the fixed designation A523; the number immediately following the designation indicates the year oforigi
2、nal adoption or, in the case of revision, 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 specification covers seamless and electric-resistance-welde
3、d steel pipe used as conduit for the installationof high-pressure pipe-type electrical cables in NPS 4 to NPS12, inclusive, with nominal (average) wall thicknesses 0.219 to0.562 in., depending on size. Pipe having other dimensions(Note 2) may be furnished, provided such pipe complies withall other r
4、equirements of this specification.NOTE 1The dimensionless designator NPS (nominal pipe size) hasbeen substituted in this standard for such traditional terms as “nominaldiameter,” “size,” and “nominal size.”NOTE 2A comprehensive listing of standardized pipe dimensions iscontained in ANSI B36.10.1.2 P
5、ipe ordered under this specification is suitable forwelding and for forming operations involving flaring, belling,and bending.1.3 Pipe for this purpose shall be furnished in Grade A orGrade B as specified in the purchase order. Grade A is moresuitable for forming operations involving bending, flarin
6、g, orbelling and this grade is normally preferred. This provision isnot intended to prohibit the cold bending, flaring, or belling ofGrade B pipe.1.4 The values stated in inch-pound units are to be regardedas standard. The values given in parentheses are mathematicalconversions to SI units that are
7、provided for information onlyand are not considered standard.1.5 The following hazard caveat applies to the test methodportion, Section 20, of this specification: This standard doesnot purport to address all of the safety concerns, if any,associated with its use. It is the responsibility of the user
8、 of thisstandard to establish appropriate safety and health practicesand determine the applicability of regulatory limitations priorto use.2. Referenced Documents2.1 ASTM Standards:2A370 Test Methods and Definitions for Mechanical Testingof Steel ProductsA751 Test Methods, Practices, and Terminology
9、 for Chemi-cal Analysis of Steel ProductsE59 Practice for Sampling Steel and Iron for Determinationof Chemical Composition (Withdrawn 1996)32.2 ANSI Standard:B36.10 Welded and Seamless Wrought Steel Pipe43. Ordering Information3.1 Orders for material under this specification shouldinclude the follow
10、ing, as required, to describe the desiredmaterial adequately:3.1.1 Quantity (feet or number of lengths),3.1.2 Name of material (steel pipe),3.1.3 Method of manufacture (seamless or electric-resistance-welded),3.1.4 Grade (Table 1),3.1.5 Size (outside diameter and nominal wall thickness orweight per
11、foot),3.1.6 Length when other than specified in Section 13,3.1.7 End finish (Section 16),3.1.8 Skelp for tension tests, if permitted 20.2,3.1.9 When mill applied coating is required (Section 10),and3.1.10 ASTM specification number.1This specification is under the jurisdiction of ASTM Committee A01 o
12、n Steel,Stainless Steel and 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 1964. Last previous edition approved in 2005 as A523 96 (2005).DOI: 10.1520/A0523-
13、96R12.This specification was initiated by the IEEE Insulated Conductors Committee inrecognition of the need for a specification embodying the special requirements ofpipe for high-voltage electrical circuits. It was prepared for acceptance as anASTMspecification by a task group of Subcommittee A01.09
14、 of ASTM Committee A01.2For 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.3The last approved version of this his
15、torical standard is referenced onwww.astm.org.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 States14. Process4.1 The steel shall be made
16、 by one or more of the followingprocesses: open-hearth, basic-oxygen, or electric-furnace.4.2 Steel may be cast in ingots or may be strand cast. Whensteels of different grades are sequentially strand cast, identifi-cation of the resultant transition material is required. Theproducer shall remove the
17、 transition material by any estab-lished procedure that positively separates the grades.5. Chemical Composition5.1 The steel shall conform to the requirements as tochemical composition prescribed in Table 2 and the chemicalanalysis shall be in accordance with Test Methods, Practices,and Terminology
18、A751.6. Heat Analysis6.1 When specified in the purchase order, the manufacturershall report the heat analysis of each heat of steel used in themanufacture of pipe to this specification. The analysis shallconform to the requirements specified in Section 5 for thegrade of pipe ordered.7. Product Analy
19、sis7.1 When specified in the purchase order, a product analysisreport shall be furnished by the manufacturer on two pipesfrom each lot of 400 lengths, or fraction thereof, of 412-in.outside diameter and 5916-in. outside diameter sizes and fromeach lot of 200 lengths, or fraction thereof, of each siz
20、e 658-in.outside diameter through 1234-in. outside diameter pipe.Samples for chemical analysis, except for spectrographicanalysis, shall be taken in accordance with Practice E59. Thechemical composition thus determined shall conform to therequirements specified in Section 5.7.2 Product Analysis Rete
21、stsIf both lengths of pipe rep-resenting the lot fail the specified product analysis, the lot shallbe rejected, or at the option of the manufacturer, all of theremaining lengths of the lot shall be tested individually forconformance to the specified requirements. If only one of thelengths of pipe re
22、presenting the lot fails the specified checkanalysis, the lot shall be rejected or, at the option of themanufacturer, two retest analyses shall be made on twoadditional lengths selected from the same lot. If both of theseretest analyses conform to the specified requirements, the lotshall be accepted
23、 except for the length which failed on theinitial analysis. If one or both of the retest analyses fail thespecified requirements, the entire lot shall be rejected, or, at theoption of the manufacturer, each of the remaining lengths shallbe tested individually. Only analysis of the rejecting element
24、orelements is necessary in checking the remaining lengths.8. Tensile Requirements8.1 The material shall conform to the requirements as totensile properties prescribed in Table 1.8.2 The yield point shall be determined by the drop of thebeam or by the halt in the gauge of the testing machine, by theu
25、se of dividers, or by other approved methods. When a definiteyield point is not exhibited, the yield strength corresponding toa permanent offset of 0.2 % of the gauge length of thespecimen or to a total extension of 0.5 % of the gauge lengthof the specimen under load shall be determined.8.3 The test
26、 specimen taken across the weld shall show atensile strength not less than the minimum tensile strengthspecified for the grade of pipe ordered. This test will not berequired for pipe under NPS 8.TABLE 1 Tensile RequirementsGrade A Grade BTensile strength, min, ksi (MPa) 48 (330) 60 (415)Yield streng
27、th, min, ksi (MPa) 30 (205) 35 (240)Elongation in 2 in. or 50 mm, %:Basic minimum elongation for walls516 in. (7.94mm) and over in thickness, longitudinal striptests, and for small sizes tested in full section.35 30When standard round 2-in. or 50-mm gage lengthtest specimen is used28 22For longitudi
28、nal strip tests, the width of the gagesection shall be 112 in. (38.1 mm) and adeduction for each132 in. (0.79 mm) decrease inwall thickness below516 in. (7.94 mm) from thebasic minimum elongation of the followingpercentage points1.75A1.50AAThe following tableBgives the minimum computed values:Wall T
29、hickness Elongation in 2 in. or 50mm, min, %in. mm Grade A Grade B516 (0.312) 7.94 35.0 30.0932 (0.281) 7.14 33.2 28.514 (0.250) 6.35 31.5 27.0732 (0.219) 5.56 29.8 25.5316 (0.188) 4.76 28.0 24.0532 (0.156) 3.97 26.2 22.518 (0.125) 3.18 24.5 21.0332 (0.094) 2.38 22.8 19.5116 (0.062) 1.59 21.0 18.0BT
30、his table gives the computed minimum elongation values for each132 in.(0.79 mm) decrease in wall thickness. Where the wall thickness lies between twovalues shown above, the minimum elongation value shall be determined by thefollowing equation:Grade EquationABE =56t + 17.50E =48t + 15.00where:E = elo
31、ngation in 2 in. or 50 mm, %, andt = actual thickness of specimen, in.TABLE 2 Chemical RequirementsComposition, %Carbon,maxManganese,maxPhosphorus,maxSulfur,maxHeat Product Heat Product Heat Product Heat ProductGrade ASeamless 0.22 0.25 0.90 0.95 0.035 0.045 0.050 0.060E.R.W.A0.21 0.25 0.90 0.95 0.0
32、35 0.045 0.050 0.060Grade BSeamless 0.27 0.30 1.15 1.20 0.035 0.045 0.050 0.060E.R.W.A0.26 0.30 1.15 1.20 0.035 0.045 0.050 0.060AElectric-Resistance-Welded pipe.A523 96 (2012)29. Flattening Test Requirements9.1 Seamless PipeFor seamless pipe, a section not lessthan 212 in. (63.5 mm) in length shall
33、 be flattened cold betweenparallel plates in two steps. During the first step, which is a testfor ductility, no cracks or breaks on the inside or outside or endsurfaces, except as provided for in 9.5, shall occur until thedistance between the plates is less than the value of Hcalculated by the follo
34、wing equation:H 511e!te1tD(1)where:H = distance between flattening plates, in. (mm),e = deformation per unit length (constant for a givengrade of steel, 0.09 for Grade A and 0.07 for Grade B),t = specified wall thickness, in. (mm), andD = specified outside diameter, in. (mm).During the second step,
35、which is a test for soundness, theflattening shall be continued until the specimen breaks or theopposite walls of the pipe meet. Evidence of laminated orunsound material that is revealed during the entire flatteningtest shall be cause for rejection.9.2 Electric-Resistance-Welded PipeAspecimen at lea
36、st 4in. (101.6 mm) in length shall be flattened cold betweenparallel plates in three steps with the weld located either 0 or90 from the line of direction of force as required in 9.2.1during the first step, which is a test for ductility of the weld, nocracks or breaks on the inside or outside surface
37、s shall occuruntil the distance between the plates is less than two thirds ofthe original outside diameter of the pipe. As a second step, theflattening shall be continued. During the second step, which istest for ductility exclusive of the weld, no cracks or breaks onthe inside or outside surfaces,
38、except as provided for in 9.5,shall occur until the distance between the plates is less than onethird of the original outside diameter of the pipe but is not lessthan five times the wall thickness of the pipe. During the thirdstep, which is a test for soundness, the flattening shall becontinued unti
39、l the specimen breaks or the opposite walls of thepipe meet. Evidence of laminated or unsound material or ofincomplete weld that is revealed during the entire flattening testshall be cause for rejection.9.2.1 For pipe produced in single lengths, the flattening testspecified in 9.2 shall be made on b
40、oth crop ends cut from eachlength of pipe. The tests from each end shall be madealternately with the weld at 0 and at 90 from the line ofdirection of force. For pipe produced in multiple lengths, theflattening test shall be made on crop ends representing the frontand back of each coil with the weld
41、at 90 from the line ofdirection of force, and on two intermediate rings representingeach coil with the weld 0 from the line of direction of force.9.3 Surface imperfections in the test specimen beforeflattening, but revealed during the first step of the flatteningtest, shall be judged in accordance w
42、ith the finish requirementsin Section 15.9.4 Superficial ruptures as a result of surface imperfectionsshall not be cause for rejection.9.5 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,
43、cracks at theselocations shall not be cause for rejection if the D-to-t ratio isless than ten.10. Coatings10.1 Unless otherwise specified, the pipe shall not be givena mill coating of paint, oil, or any other material either insideor outside.11. Dimensions and Weight11.1 Dimensions and weight of pip
44、e included in this speci-fication are listed in Table 3.12. Dimensions, Weight, and Permissible Variations12.1 WeightThe weight of the pipe as specified in Table 3shall not vary by more than the following amounts:Extra-strong and lighter wall thickness 5 %Minimum permissible length 10 %TABLE 3 Dimen
45、sions, Weight, and Test PressuresNPSDesig-natorOutsideDi-ameter,in.WallThicknessNominalWeightTest PressureGrade A Grade Bin. mm lb/ft kg/m psi MPa psi MPa4412 0.237 6.02 10.79 16.1 1900 13.10 2200 15.170.250 6.35 11.35 16.9 2000 13.79 2300 15.860.281 7.14 12.66 18.8 2200 15.17 2500 17.240.312 7.92 1
46、3.96 20.7 2500 17.24 2500 17.2455916 otherwise, the length shall be rejected. For pipeproduced in multiple lengths, retests may be cut from each endof each individual length in the multiple. Such tests shall bemade with the weld alternately 0 and 90 from the line ofdirection of force.19. Hydrostatic
47、 Test19.1 Each length of pipe shall be tested at the mill to thehydrostatic pressures prescribed in Table 3. The hydrostaticpressure shall be maintained for not less than 5 s.20. Test Methods20.1 The test specimens and the tests required by thisspecification shall conform to those described in the l
48、atest issueof Test Methods and Definitions A370. When impracticable topull a test specimen in full thickness, the standard 2-in. or50-mm gauge length tension test specimen shown in Fig. 6 ofTest Methods and Definitions A370 may be used.20.2 The longitudinal tension test specimen shall be takenfrom t
49、he end of the pipe or, by agreement between themanufacturer and the purchaser, may be taken from the skelp,at a point approximately 90 from the weld, and shall not beA523 96 (2012)4flattened between gauge marks. The sides of each specimenshall be parallel between gauge marks.20.3 Transverse weld test specimens from electric-weldedpipe shall be taken with the weld at the center of the specimen.All transverse test specimens shall be approximately 112 in.(38.1 mm) wide in the gauge length and shall represent the fullwall thickness of the pipe f
