1、Designation: A 714 99 (Reapproved 2003)Standard Specification forHigh-Strength Low-Alloy Welded and Seamless Steel Pipe1This standard is issued under the fixed designation A 714; 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 (e) indicates an editorial change since the last revision or reapproval.1. Scope1.1 This specification covers seamless and welded high-strength low-alloy steel pipe NPS12 to NPS 26, inclusive.
3、Pipehaving other dimensions may be furnished provided such pipecomplies with all other requirements of this specification. Thismaterial is intended for pressure piping service, and othergeneral purposes, where savings in weight or added durabilityare important.NOTE 1The dimensionless designator NPS
4、(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 Standard B36.10.1.2 ClassThese high-strength low-alloy steels have en-hanced resistan
5、ce to general atmospheric corrosion by weath-ering as commonly encountered in rural, urban, marine, andindustrial environments. They are supplied in two classes:Class 2, having corrosion resistance equivalent to that ofcarbon steel with copper (0.20 minimum Cu); and Class 4,having corrosion resistan
6、ce substantially better than that ofClass 2 (Note 3). Class 4 steels when properly exposed to theatmosphere can be used bare (unpainted) for many applica-tions.NOTE 3For methods of estimating the atmospheric corrosion resis-tance of low alloy steels see Guide G 101 or actual data.1.3 TypePipe may be
7、 furnished in the following types ofmanufacturing processes:Type FFurnace-butt welded, continuous welded,Type EElectric-resistance welded, andType SSeamless.1.3.1 Pipe ordered under this specification is suitable forwelding.1.3.2 Type E pipe may be furnished either nonexpanded orcold-expanded at the
8、 option of the manufacturer.1.3.3 Types F, E, and S pipe are commonly furnished innonheat-treated condition. Type S pipe may be furnished innormalized (or other) heat-treated condition, when so specified.1.3.4 Types F, E, and S pipe in single random lengths maybe furnished with hot-dipped galvanized
9、 coating of zinc,subject to inquiry to the producer.1.3.5 Couplings, when furnished, shall be of the same class,heat-treated condition, and grade of material as the pipeordered.1.4 GradeThis specification designates eight grades ofsteel composition as listed in Table 1 and corresponding tensilerequi
10、rements for the grades as listed in Table 2.1.4.1 For Class 2 pipe, Grade I, II, or III shall be specified,and copper-bearing steel is required as specified in Table 1.1.4.2 For Class 4 pipe, Grade IV, V, VI, VII, or VIII shall bespecified. Alternatively, for Class 4, Type S, and Type E pipe,a steel
11、 composition corresponding to a grade listed in Table 1of Specification A 588/A 588M may be specified, subject tonegotiation.1.5 When Class 4 pipe is joined by welding or is used inwelded construction, the user is cautioned that the selection ofwelding procedure and resultant composition of fused me
12、talshould be suitable for Class 4 material and the intendedservice.1.6 The values stated in inch-pound units are to be regardedas the standard.2. Referenced Documents2.1 ASTM Standards:2A 53/A 53M Specification for Pipe, Steel, Black and Hot-Dipped, Zinc-Coated, Welded and SeamlessA 90 Test Method f
13、or Weight Mass of Coating on Iron andSteel Articles with Zinc or Zinc-Alloy CoatingsA 370 Test Methods and Definitions for Mechanical Testingof Steel ProductsA 588/A 588M Specification for High Strength Low-AlloyStructural Steel with 50 ksi 345 MPa Minimum YieldPoint to 4-in. 100-mm ThickA 700 Pract
14、ices for Packaging, Marking, and LoadingMethods for Steel Products for Domestic ShipmentA 751 Test Methods, Practices, and Terminology forChemical Analysis of Steel Products1This specification is under the jurisdiction of ASTM Committee A01 on Steel,Stainless Steel, and Related Alloys and is the dir
15、ect responsibility of SubcommitteeA01.09 on Carbon Steel Tubular Products.Current edition approved Mar. 10, 1999. Published May 1999. Originallyapproved in 1975. Last previous edition approved in 1996 as A 714 96.2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Cu
16、stomer Service at serviceastm.org. For Annual Book of ASTMStandards volume information, refer to the standards Document Summary page onthe ASTM website.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.B 6 Specification for ZincG 101 G
17、uide for Estimating the Atmospheric CorrosionResistance of Low-Alloy Steels2.2 ANSI Standard:TABLE 1 Chemical RequirementsComposition, %Element Grade I Grade II Grade III Grade IVHeat Product Heat Product Heat Product Heat ProductCarbon, max 0.22 0.26 0.22 0.26 0.23 0.27 0.10 0.13Manganese 1.25 max
18、1.30 max 0.85 to 1.25 1.30 max 1.35 max 1.40 max 0.60 max 0.65 maxPhosphorus . . 0.04 max 0.05 max 0.04 max 0.05 max 0.03 to 0.08ASulfur, max 0.05 0.063 0.05 0.063 0.05 0.06 0.05 0.06Silicon . . 0.30 max 0.33 max 0.30 max 0.35 max . .Copper 0.20 min 0.18 min 0.20 min 0.18 min 0.20 min 0.18 min 0.25
19、to 0.45 0.22 to 0.48Vanadium . . 0.02 min 0.01 min 0.02Bmin 0.01 min . .Nickel . . . . . . 0.20 to 0.50 0.17 to 0.53Chromium . . . . . . 0.80 to 1.20 0.74 to 1.26Molybdenum . . . . . . . .Composition, %Element Grade V Grade VI Grade VII Grade VIIIHeat Product Heat Product Heat Product Heat ProductCa
20、rbon, max 0.16 0.20 0.15 0.18 0.12 0.15 0.19 0.23Manganese 0.40 to1.010.35 to1.060.50 to 1.00 0.45 to1.050.20 to0.500.17 to0.530.80 to 1.25 0.74 to 1.31Phosphorus 0.035 max 0.045 max 0.035 max 0.045 max 0.07 to0.15A0.04 max 0.05 maxSulfur, max 0.040 0.050 0.045 0.055 0.05 0.06 0.05 0.06Silicon . . .
21、 . 0.25 to0.750.20 to0.800.30 to 0.65 0.25 to 0.70Copper 0.80 min 0.75 to1.250.30 to 1.00 0.27 to1.030.25 to0.550.22 to0.580.25 to 0.40 0.22 to 0.43Vanadium . . . . . . 0.02 to 0.10 0.01 to 0.11Nickel 1.65 min 1.60 to2.240.40 to 1.10 0.35 to1.150.65 max 0.68 max 0.40 max 0.43 maxChromium . . 0.30 ma
22、x 0.33 max 0.30 to1.250.24 to1.310.40 to 0.65 0.36 to 0.69Molybdenum . . 0.10 to 0.20 0.09 to0.21. . . .ABecause of the degree to which phosphorus segregates, product analysis for this element is not technologically appropriate for rephosphorized steels unlessmisapplication is clearly indicated.BFor
23、 Grade III, columbium may be used in conformance with the following limits: 0.005 % min (heat) and 0.004 % min (product).TABLE 2 Tensile RequirementsClass 2 Pipe Class 4 PipeGrade I Grade II Grade III Grade IV Grade V,Type FGrade V,Type E and SGrade VI,Type E and SGrade VII,AType E and SGrade VIII,T
24、ype E and STensile strength,min, psi (MPa)70 000 (485) 70 000 (485) 65 000 (450) 58 000 (400) 55 000 (380) 65 000 (450) 65 000 (450) 65 000 (450) 70 000 (485)Yield strength, min,psi (MPa)50 000 (345) 50 000 (345) 50 000 (345) 36 000 (250) 40 000 (275) 46 000 (315) 46 000 (315) 45 000 (310) 50 000 (3
25、45)Elongation in 2 in.(50.8 mm)min, %22 22 20B,CB,CB,CB,C22 21Elongation in 8 in.(203.2 mm)min, %19 18 18 . . . . . .ANot available in wall thicknesses over12 in.BThe minimum elongation in 2 in. (50.8 mm) shall be determined by the following equation:e = 625 000(A0.2/U0.9)where:e = minimum elongatio
26、n in 2 in. (50.8 mm), rounded to nearest 0.5 %,A = cross-sectional area of the tension test specimen in square inches, based on specified outside diameter or nominal specimen width and specified wall thicknessrounded to the nearest 0.01 in.2If the area thus calculated is greater than 0.75 in.2, then
27、 the value of 0.75 in.2shall be used, andU = specified tensile strength, psi.CSee Table X1.1 for minimum elongation values for various size tension specimens and grades.A 714 99 (2003)2B36.10 Welded and Seamless Wrought Steel Pipe33. Terminology3.1 Definitions of Terms Specific to This Standard:3.1.
28、1 defect, nany imperfection of sufficient size or mag-nitude to be cause for rejection.3.1.2 imperfection, nany discontinuity or irregularityfound in the pipe.4. Ordering Information4.1 Orders for material under this specification shouldinclude the following, as required, to describe the desiredmate
29、rial adequately:4.1.1 Quantity (feet, or metres, or number of lengths),4.1.2 Name of material (steel pipe),4.1.3 Class of pipe (Class 2 or Class 4, see 1.2),4.1.4 Method of manufacture or Type of pipe (Types F, E, orS, see 1.3),4.1.5 Grade (see 1.4),4.1.6 Heat treatment, when required (see 1.3.3),4.
30、1.7 Surface finish (bare, oiled, coated, or galvanized),4.1.8 Size (either NPS and weight class or schedule number,or both; or outside diameter and nominal wall thickness),4.1.9 Length (specific or random, see Section 14),4.1.10 End finish (plain or threaded, see Section 15),4.1.11 Skelp for tension
31、 tests, if permitted (see 11.2),4.1.12 Couplings, if threaded; no couplings, if not desired;couplings power-tight, if so desired,4.1.13 Specification number,4.1.14 End use of material, and4.1.15 Special requirements.5. Materials and Manufacture5.1 The steel shall be made by one or more of the follow
32、ingprocesses: open-hearth, basic-oxygen, or electric-furnace.5.2 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 transition material by any e
33、stab-lished procedure that positively separates the grades.5.3 The pipe shall be made by the seamless, furnace-buttwelded (continuous-welded), or electric resistance-weldedprocess.6. Chemical Composition6.1 When subjected to the heat and product analysis, respec-tively, the steel shall conform to th
34、e requirements prescribed inTable 1. Chemical analysis shall be in accordance with TestMethods, Practices, and Terminology A 751.6.2 For Grade I, the choice and use of alloying elements,combined with carbon, manganese, sulfur, and copper withinthe limits prescribed in Table 1 to give the mechanicalp
35、roperties prescribed in Table 2, shall be made by the manu-facturer and included and reported in the heat analysis forinformation purposes only to identify the type of steel applied.For Class 4 material, the atmospheric corrosionresistanceindex, calculated on the basis of the chemical composition of
36、the steel as described in Guide G 101, shall be 6.0 or higher.NOTE 4The user is cautioned that the Guide G 101 predictiveequation for calculation of an atmospheric corrosionresistance index hasbeen verified only for the composition limits stated in that guide. It is notapplicable, for example, for S
37、pecification A 714 Grade V because thecopper and nickel contents of this grade are greater than the limitsspecified in Guide G 101.6.3 Heat AnalysisAn analysis of each heat of open-hearth,basic-oxygen or electric-furnace steel shall be made from a testingot taken during the pouring of the heat. The
38、chemicalcomposition thus determined shall conform to the requirementsspecified in Table 1 for heat analysis.6.4 Product Analysis:6.4.1 An analysis may be made by the purchaser fromfinished pipe manufactured in accordance with this specifica-tion, or an analysis may be made from flat-rolled stock fro
39、mwhich the welded pipe is manufactured. When product analy-ses are made, two sample lengths from each lot of 500 lengthsor fraction thereof shall be selected. The chemical compositionthus determined shall conform to the requirements specified inTable 1 for product analysis.6.4.2 In the event that th
40、e chemical composition of one ofthe sample lengths does not conform to the requirementsshown in Table 1 for product analysis, an analysis shall bemade on two additional lengths selected from the same lot,each of which shall conform to the requirements specified inTable 1 for product analysis, or the
41、 lot is subject to rejection.7. Tensile Requirements7.1 The material shall conform to the requirements as totensile properties prescribed in Table 2 for the grade of Class 2or Class 4 pipe specified.7.2 The yield strength corresponding to a permanent offsetof 0.2 % of the gage length of the specimen
42、 or to a totalextension of 0.5 % of the gage length under load shall bedetermined.7.3 The test specimen taken across the weld of welded pipeshall show a tensile strength not less than the minimum tensilestrength specified for the grade of pipe ordered. This test willnot be required for pipe under NP
43、S 8.7.4 Transverse tension test specimens for electric-weldedpipe NPS 8 and larger shall be taken opposite the weld. Alltransverse test specimens shall be approximately 112 in. (38.1mm) wide in the gage length, and shall represent the full wallthickness of the pipe from which the specimen was cut.8.
44、 Bending Requirements8.1 For pipe NPS 2 and under, a sufficient length of pipeshall withstand being bent cold through 90 around a cylindri-cal mandrel, the diameter of which is twelve times the nominaldiameter of the pipe, without developing cracks at any portionand without opening the weld. Double-
45、extra-strong pipe neednot be subjected to the bend test.9. Flattening Test9.1 The flattening test shall be made on pipe over NPS 2with wall thicknesses extra strong and lighter.3Available from American National Standards Institute, 11 West 42nd St., 13thFloor, New York, NY 10036.A 714 99 (2003)39.2
46、Seamless Pipe:9.2.1 For seamless pipe a section not less than 212 in. (63.5mm) in length shall be flattened cold between parallel plates intwo steps. During the first step, which is a test for ductility, nocracks or breaks on the inside or outside or end surfaces, exceptas provided for in 9.7, shall
47、 occur until the distance betweenthe plates is less than the value of H calculated as follows:H1 1 e!te 1 t/D!where:H = distance between flattening plates, in. or mm,e = deformation per unit length (constant for a given gradeof steel, 0.07),t = specified wall thickness, in. or mm, andD = specified o
48、utside diameter, in. or mm.9.2.2 During the second step, which is a test for soundness,the flattening shall be continued until the specimen breaks orthe opposite walls of the pipe meet. Evidence of laminated orunsound material that is revealed during the entire flatteningtest shall be cause for reje
49、ction.9.3 Electric-Resistance-Welded Pipe A specimen at least4 in. (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 9.3.1.During the first step, which is a test for ductility of the weld, nocracks or breaks on the inside or outside surfaces 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, w
