1、Designation: A790/A790M 17Standard Specification forSeamless and Welded Ferritic/Austenitic Stainless SteelPipe1This standard is issued under the fixed designation A790/A790M; the number immediately following the designation indicates the yearof original adoption or, in the case of revision, the yea
2、r of last revision. A number in parentheses indicates the year of last reapproval.A superscript epsilon () indicates an editorial change since the last revision or reapproval.1. Scope*1.1 This specification2covers seamless and straight-seamwelded ferritic/austenitic steel pipe intended for general c
3、orro-sive service, with particular emphasis on resistance to stresscorrosion cracking. These steels are susceptible to embrittle-ment if used for prolonged periods at elevated temperatures.1.2 Optional supplementary requirements are provided forpipe when a greater degree of testing is desired. These
4、supplementary requirements call for additional tests to be madeand, when desired, one or more of these may be specified in theorder.1.3 Appendix X1 of this specification lists the dimensions ofwelded and seamless stainless steel pipe as shown in ANSIB36.19. Pipe having other dimensions may be furnis
5、hedprovided such pipe complies with all other requirements of thisspecification.1.4 The values stated in either SI units or inch-pound unitsare to be regarded separately as standard. Within the text, theSI units are shown in brackets. The values stated in eachsystem may not be exact equivalents; the
6、refore, each systemshall be used independently of the other. Combining valuesfrom the two systems may result in non-conformance with thestandard. The inch-pound units shall apply unless the Mdesignation of this specification is specified in the order.NOTE 1The dimensionless designator NPS (nominal p
7、ipe size) hasbeen substituted in this standard for such traditional terms as nominaldiameter, size, and nominal size.1.5 This international standard was developed in accor-dance with internationally recognized principles on standard-ization established in the Decision on Principles for theDevelopmen
8、t of International Standards, Guides and Recom-mendations issued by the World Trade Organization TechnicalBarriers to Trade (TBT) Committee.2. Referenced Documents2.1 ASTM Standards:3A370 Test Methods and Definitions for Mechanical Testingof Steel ProductsA923 Test Methods for Detecting Detrimental
9、IntermetallicPhase in Duplex Austenitic/Ferritic Stainless SteelsA941 Terminology Relating to Steel, Stainless Steel, RelatedAlloys, and FerroalloysA999/A999M Specification for General Requirements forAlloy and Stainless Steel PipeE213 Practice for Ultrasonic Testing of Metal Pipe andTubingE309 Prac
10、tice for Eddy Current Examination of Steel Tubu-lar Products Using Magnetic SaturationE381 Method of Macroetch Testing Steel Bars, Billets,Blooms, and ForgingsE426 Practice for Electromagnetic (Eddy Current) Examina-tion of Seamless and Welded Tubular Products, Titanium,Austenitic Stainless Steel an
11、d Similar AlloysE527 Practice for Numbering Metals and Alloys in theUnified Numbering System (UNS)2.2 ANSI Standards:4B1.20.1 Pipe Threads, General PurposeB36.10 Welded and Seamless Wrought Steel PipeB36.19 Stainless Steel Pipe2.3 SAE Standard:5SAE J 10862.4 Other Standard:6SNT-TC-1A Personal Qualif
12、ication and Certification inNondestructive Testing1This specification is under the jurisdiction of ASTM Committee A01 on Steel,Stainless Steel and Related Alloys and is the direct responsibility of SubcommitteeA01.10 on Stainless and Alloy Steel Tubular Products.Current edition approved Sept. 1, 201
13、7. Published September 2017. Originallyapproved in 1981. Last previous edition approved in 2016 as A790/A790M 16.DOI: 10.1520/A0790_A0790M-17.2For ASME Boiler and Pressure Vessel Code applications see related Specifi-cation SA790 in Section II of that Code.3For referenced ASTM standards, visit the A
14、STM 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.4Available from American National Standards Institute (ANSI), 25 W. 43rd St.,4th Floor, New York, NY 100
15、36, http:/www.ansi.org.5Available from Society of Automotive Engineers (SAE), 400 CommonwealthDr., Warrendale, PA 15096-0001, http:/www.sae.org.6Available fromAmerican Society for Nondestructive Testing (ASNT), P.O. Box28518, 1711 Arlingate Ln., Columbus, OH 43228-0518, http:/www.asnt.org.*A Summary
16、 of Changes section appears at the end of this standardCopyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United StatesThis international standard was developed in accordance with internationally recognized principles on standardization established in
17、 the Decision on Principles for theDevelopment of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.12.5 AWS Standard:7A5.9 Corrosion-Resisting Chromium and Chromium-NickelSteel Welding Rods and Electrodes3. Termino
18、logy3.1 DefinitionsFor definitions of terms used in this speci-fication refer to Terminology A941.4. Ordering Information4.1 Orders for material under this specification shouldinclude the following, as required, to describe the desiredmaterial adequately:4.1.1 Quantity (feet, metres, or number of le
19、ngths),4.1.2 Name of material (ferritic/austenitic steel pipe),4.1.3 Process (seamless or welded),4.1.4 Grade (see Table 1),4.1.5 Size (NPS designator or outside diameter and sched-ule number of average wall thickness),4.1.6 Length (specific or random) (see Section 11),7Available from American Weldi
20、ng Society (AWS), 550 NW LeJeune Rd.,Miami, FL 33126, http:/www.aws.org.TABLE 1 Heat TreatmentUNSDesignationTypeATemperature F C QuenchS31200 1920201010501100Rapid cooling in waterS31260 1870201010201100Rapid cooling in air or waterS31500 180019009801040Rapid cooling in air or waterS31803 1870201010
21、201100Rapid cooling in air or waterS32003 1850205010101120Rapid cooling in air or waterS32101 1870 1020 Quenched in water or rapidlycooled by other meansS32202 1870197510201080Rapid cooling in air or waterS32205 2205 1870201010201100Rapid cooling in air or waterS32304 2304 170019209251050Rapid cooli
22、ng in air or waterS32506 1870205010201120Rapid cooling in air or waterS32520 1975205010801120Rapid cooling in air or waterS32550 255 1900 1040 min Rapid cooling in air or waterS32707 1975205010801120Rapid cooling in air or waterS32750 2507 1880206010251125Rapid cooling in air or waterS32760 19602085
23、10701140Rapid cooling in air or waterS32808 1920210010501150Rapid cooling in air or waterS32900 329 17001750925955Rapid cooling in air or waterS32906 1870210010201150Rapid cooling in air or waterS32950 182018809901025Air coolS33207 1905208510401140Rapid cooling in water or byother meansS39274 192020
24、6010251125Rapid cooling in air or waterS39277 1975215510801180Rapid cooling in air or waterS81921 176020109601100Rapid cooling in air or waterS82011 1850205010101120Rapid cooling in air or waterS82121 1830201010001100Rapid cooling in air or waterS82441 1870 1020 Rapid cooling in air or waterS83071 .
25、 . . 1830210010001150Rapid cooling in water or byother meansACommon name, not a trademark, widely used, not associated with any oneproducer. 329 is an AISI number.A790/A790M 1724.1.7 End finish (section on ends of Specification A999/A999M),4.1.8 Optional requirements (product analysis, Section 9;hyd
26、rostatic test or nondestructive electric test, Section 14),4.1.9 Test report required (section on certification of Speci-fication A999/A999M),4.1.10 Specification designation, and4.1.11 Special requirements and any supplementary require-ments selected.5. General Requirements5.1 Material furnished un
27、der this specification shall con-form to the applicable requirements of the current edition ofSpecification A999/A999M unless otherwise provided herein.6. Materials and Manufacture6.1 Manufacture:6.1.1 The pipe shall be made by the seamless or anautomatic welding process, with no addition of filler
28、metal inthe welding operation.6.1.2 At the manufacturers option, pipe may be eitherhot-finished or cold-finished.6.1.3 The pipe shall be pickled free of scale. When brightannealing is used, pickling is not necessary.6.2 DiscardA sufficient discard shall be made from eachingot to secure freedom from
29、injurious piping and unduesegregation.6.3 Unless otherwise stated in the order, all pipe shall befurnished in the heat-treated condition as shown in Table 1.6.3.1 For seamless pipe, as an alternate to final heat treat-ment in a continuous furnace or batch-type furnace, immedi-ately following hot for
30、ming while the temperature of the pipesis not less than the specified minimum solution treatmenttemperature, pipes shall be individually quenched in water orrapidly cooled by other means, except for UNS S32950, whichshall be air cooled.6.3.2 If the purchaser desires pipe without heat treatmentsubseq
31、uent to welding, the purchase order shall specify thefollowing condition:6.3.2.1 No final heat treatment of pipe fabricated from platethat has been heat treated as required by Table 1 for theparticular grade is required, provided a sample of that heat offinished pipe or material representative of th
32、at heat of pipe asa prolongation of the weld passes the Test Methods A923Method B or C (See Note 2), including base metal, weld metal,and heat affected zone per heat. Each pipe supplied under thisrequirement shall be stenciled with the suffix “HT-O.”6.3.2.2 For materials not listed in Table 3 of Tes
33、t MethodsA923, the HT-O provision does not apply.NOTE 2The Test Methods A923 test method (B or C) is at themanufacturers option, unless otherwise specified by the purchaser.7. Chemical Composition7.1 The steel shall conform to the chemical requirements asprescribed in Table 2.8. Heat Analysis8.1 An
34、analysis of each heat of steel shall be made by thesteel manufacturer to determine the percentages of the ele-ments specified.9. Product Analysis9.1 At the request of the purchasers inspector, an analysisof one billet or one length of flat-rolled stock from each heat,or two pipes from each lot, shal
35、l be made by the manufacturer.A lot of pipe shall consist of the following number of lengthsof the same size and wall thickness from any one heat of steel:NPS Designator Lengths of Pipe in LotUnder 2 400 or fraction thereof2 to 5, incl 200 or fraction thereof6 and over 100 or fraction thereof9.2 The
36、 results of these analyses shall be reported to thepurchaser or the purchasers representative and shall conformto the requirements specified in Section 7.9.3 If the analysis of one of the tests specified in 8.1 or 9.1does not conform to the requirements specified in Section 7,ananalysis of each bill
37、et or pipe from the same heat or lot may bemade, and all billets or pipe conforming to the requirementsshall be accepted.10. Tensile and Hardness Properties10.1 The material shall conform to the tensile and hardnessproperties prescribed in Table 3.11. Lengths11.1 Pipe lengths shall be in accordance
38、with the followingregular practice:11.1.1 Unless otherwise agreed upon, all sizes from NPS18to and including NPS 8 are available in a length up to 24 ft (seeNote 3) with the permissible range of 15 to 24 ft (see Note 3).Short lengths are acceptable and the number and minimumlength shall be agreed up
39、on between the manufacturer and thepurchaser.NOTE 3This value applies when the inch-pound designation of thisspecification is the basis of purchase. When the M designation of thisspecification is the basis of purchase, the corresponding metric value(s)shall be agreed upon between the manufacturer an
40、d purchaser.11.1.2 If definite cut lengths are desired, the lengths re-quired shall be specified in the order. No pipe shall be less thanthe specified length and no more than14 in. 6 mm over it.11.1.3 No jointers are permitted unless otherwise specified.12. Workmanship, Finish, and Appearance12.1 Th
41、e finished pipes shall be reasonably straight andshall have a workmanlike finish. Imperfections may be re-moved by grinding, provided the wall thicknesses are notdecreased to less than that permitted, in the PermissibleVariations in Wall Thickness Section of Specification A999/A999M.13. Mechanical T
42、ests Required13.1 Transverse or Longitudinal Tension TestOne tensiontest shall be made on a specimen for lots of not more than 100A790/A790M 173pipes. Tension tests shall be made on specimens from 2 pipesfor lots of more than 100 pipes.13.2 Mechanical Testing Lot DefinitionThe term lot formechanical
43、 tests applies to all pipe of the same nominal sizeand wall thickness (or schedule) that is produced from the sameheat of steel and subjected to the same finishing treatment asdefined as follows:13.2.1 Where the heat treated condition is obtained, consis-tent with the requirements of 6.3, in a conti
44、nuous heattreatment furnace or by directly obtaining the heat treatedcondition by quenching after hot forming, the lot shall includeall pipe of the same size and heat, heat treated in the samefurnace at the same temperature, time at heat, and furnacespeed or all pipe of the same size and heat, hot f
45、ormed andquenched in the same production run.13.2.2 Where final heat treatment is obtained, consistentwith the requirements of 6.3, in a batch-type heat-treatmentfurnace equipped with recording pyrometers and automaticallycontrolled within a 50 F 30 C or smaller range, the lot shallbe the larger of
46、(a) each 200 ft 60 m or fraction thereof or (b)that pipe heat treated in the same batch furnace charge.13.2.3 Where the final heat treatment is obtained, consistentwith the requirements of 6.3, in a batch-type heat-treatmentfurnace not equipped with recording pyrometers and automati-cally controlled
47、 within a 50 F 30 C or smaller range, theterm lot for mechanical tests applies to the pipe heat treated inthe same batch furnace charge, provided that such pipe is of thesame nominal size and wall thickness (or schedule) and isproduced from the same heat of steel.13.3 Flattening TestFor pipe heat tr
48、eated in a batch-typefurnace, flattening tests shall be made on 5 % of the pipe fromeach heat-treated lot. For pipe heat treated by the continuousprocess, or by direct quenching after hot forming, this test shallTABLE 2 Chemical RequirementsAUNSDesigna-tionBTypeCC Mn P S Si Ni Cr Mo N Cu OthersS3120
49、0 0.030 2.00 0.045 0.030 1.00 5.56.5 24.026.0 1.202.00 0.140.20 . . . . . .S31260 0.030 1.00 0.030 0.030 0.75 5.57.5 24.026.0 2.53.5 0.100.30 0.200.80 W0.100.50S31500 0.030 1.202.00 0.030 0.030 1.402.00 4.25.2 18.019.0 2.503.00 0.050.10 . . . . . .S31803 0.030 2.00 0.030 0.020 1.00 4.56.5 21.023.0 2.53.5 0.080.20 . . . . . .S32003 0.030 2.00 0.030 0.020 1.00 3.04.0 19.5-22.5 1.502.00 0.140.20 . . . . . .S32101 0.040 4.06
