1、Designation: A790/A790M 17A790/A790M 18Standard 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 revi
2、sion, the year 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 specification2 covers seamless and straight-seam welded ferritic/austenitic steel pipe intende
3、d for general corrosiveservice, with particular emphasis on resistance to stress corrosion cracking. These steels are susceptible to embrittlement if usedfor prolonged periods at elevated temperatures.1.2 Optional supplementary requirements are provided for pipe when a greater degree of testing is d
4、esired.These supplementaryrequirements call for additional tests to be made and, when desired, one or more of these may be specified in the order.1.3 Appendix X1 of this specification lists the dimensions of welded and seamless stainless steel pipe as shown inANSI B36.19.Pipe having other dimensions
5、 may be furnished provided such pipe complies with all other requirements of this specification.1.4 The values stated in either SI units or inch-pound units are to be regarded separately as standard. Within the text, the SI unitsare shown in brackets. The values stated in each system may not be exac
6、t equivalents; therefore, each system shall be usedindependently of the other. Combining values from the two systems may result in non-conformance with the standard. Theinch-pound units shall apply unless the M designation of this specification is specified in the order.NOTE 1The dimensionless desig
7、nator NPS (nominal pipe size) has been substituted in this standard for such traditional terms as nominal diameter,size, and nominal size.1.5 This international standard was developed in accordance with internationally recognized principles on standardizationestablished in the Decision on Principles
8、 for the Development of International Standards, Guides and Recommendations issuedby the World Trade Organization Technical Barriers to Trade (TBT) Committee.2. Referenced Documents2.1 ASTM Standards:3A370 Test Methods and Definitions for Mechanical Testing of Steel ProductsA923 Test Methods for Det
9、ecting Detrimental Intermetallic Phase in Duplex Austenitic/Ferritic Stainless SteelsA941 Terminology Relating to Steel, Stainless Steel, Related Alloys, and FerroalloysA999/A999M Specification for General Requirements for Alloy and Stainless Steel PipeE213 Practice for Ultrasonic Testing of Metal P
10、ipe and TubingE309 Practice for Eddy Current Examination of Steel Tubular Products Using Magnetic SaturationE381 Method of Macroetch Testing Steel Bars, Billets, Blooms, and ForgingsE426 Practice for Electromagnetic (Eddy Current) Examination of Seamless and Welded Tubular Products, Titanium,Austeni
11、ticStainless Steel and Similar AlloysE527 Practice for Numbering Metals and Alloys in the Unified Numbering System (UNS)2.2 ANSI Standards:4B1.20.1 Pipe Threads, General PurposeB36.10 Welded and Seamless Wrought Steel PipeB36.19 Stainless Steel Pipe1 This specification is under the jurisdiction ofAS
12、TM Committee A01 on Steel, Stainless Steel and RelatedAlloys and is the direct responsibility of Subcommittee A01.10on Stainless and Alloy Steel Tubular Products.Current edition approved Sept. 1, 2017March 1, 2018. Published September 2017March 2018. Originally approved in 1981. Last previous editio
13、n approved in 20162017as A790/A790M 16.A790/A790M 17. DOI: 10.1520/A0790_A0790M-17.10.1520/A0790_A0790M-18.2 For ASME Boiler and Pressure Vessel Code applications see related Specification SA790 in Section II of that Code.3 For referencedASTM standards, visit theASTM website, www.astm.org, or contac
14、tASTM Customer Service at serviceastm.org. For Annual Book of ASTM Standardsvolume information, refer to the standards Document Summary page on the ASTM website.4 Available from American National Standards Institute (ANSI), 25 W. 43rd St., 4th Floor, New York, NY 10036, http:/www.ansi.org.This docum
15、ent is not an ASTM standard and is intended only to provide the user of an ASTM standard an indication of what changes have been made to the previous version. Becauseit may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as a
16、ppropriate. In all cases only the current versionof the standard as published by ASTM is to be considered the official document.*A Summary 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
17、States12.3 SAE Standard:5SAE J 10862.4 Other Standard:6SNT-TC-1A Personal Qualification and Certification in Nondestructive Testing2.5 AWS Standard:7A5.9 Corrosion-Resisting Chromium and Chromium-Nickel Steel Welding Rods and Electrodes3. Terminology3.1 DefinitionsFor definitions of terms used in th
18、is specification refer to Terminology A941.4. Ordering Information4.1 Orders for material under this specification should include the following, as required, to describe the desired materialadequately:4.1.1 Quantity (feet, metres, or number of lengths),4.1.2 Name of material (ferritic/austenitic ste
19、el 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 schedule number of average wall thickness),4.1.6 Length (specific or random) (see Section 11),4.1.7 End finish (section on ends of Specification A999/A999M),4.1.8 Optional require
20、ments (product analysis, Section 9; hydrostatic test or nondestructive electric test, Section 14),4.1.9 Test report required (section on certification of Specification A999/A999M),4.1.10 Specification designation, and4.1.11 Special requirements and any supplementary requirements selected.5. General
21、Requirements5.1 Material furnished under this specification shall conform 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 an automatic welding
22、 process, with no addition of filler metal in the weldingoperation.6.1.2 At the manufacturers option, pipe may be either hot-finished or cold-finished.6.1.3 The pipe shall be pickled free of scale. When bright annealing is used, pickling is not necessary.6.2 DiscardAsufficient discard shall be made
23、from each ingot to secure freedom from injurious piping and undue segregation.6.3 Unless otherwise stated in the order, all pipe shall be furnished in the heat-treated condition as shown in Table 1.6.3.1 For seamless pipe, as an alternate to final heat treatment in a continuous furnace or batch-type
24、 furnace, immediatelyfollowing hot forming while the temperature of the pipes is not less than the specified minimum solution treatment temperature,pipes shall be individually quenched in water or rapidly cooled by other means, except for UNS S32950, which shall be air cooled.6.3.2 If the purchaser
25、desires pipe without heat treatment subsequent to welding, the purchase order shall specify the followingcondition:6.3.2.1 No final heat treatment of pipe fabricated from plate that has been heat treated as required by Table 1 for the particulargrade is required, provided a sample of that heat of fi
26、nished pipe or material representative of that heat of pipe as a prolongationof the weld passes the Test Methods A923 Method B or C (See Note 2), including base metal, weld metal, and heat affected zoneper heat. Each pipe supplied under this requirement shall be stenciled with the suffix “HT-O.”6.3.
27、2.2 For materials not listed in Table 3 of Test Methods A923, the HT-O provision does not apply.NOTE 2The Test Methods A923 test method (B or C) is at the manufacturers option, unless otherwise specified by the purchaser.7. Chemical Composition7.1 The steel shall conform to the chemical requirements
28、 as prescribed in Table 2.5 Available from Society of Automotive Engineers (SAE), 400 Commonwealth Dr., Warrendale, PA 15096-0001, http:/www.sae.org.6 Available from American Society for Nondestructive Testing (ASNT), P.O. Box 28518, 1711 Arlingate Ln., Columbus, OH 43228-0518, http:/www.asnt.org.7
29、Available from American Welding Society (AWS), 550 NW LeJeune Rd., Miami, FL 33126, http:/www.aws.org.A790/A790M 1828. Heat Analysis8.1 An analysis of each heat of steel shall be made by the steel manufacturer to determine the percentages of the elementsspecified.9. Product Analysis9.1 At the reques
30、t of the purchasers inspector, an analysis of one billet or one length of flat-rolled stock from each heat, or twopipes from each lot, shall be made by the manufacturer. A lot of pipe shall consist of the following number of lengths of the samesize and wall thickness from any one heat of steel:NPS D
31、esignator Lengths of Pipe in LotUnder 2 400 or fraction thereof2 to 5, incl 200 or fraction thereof6 and over 100 or fraction thereofTABLE 1 Heat TreatmentUNSDesignation TypeA Temperature F C QuenchS31200 1920201010501100Rapid cooling in waterS31260 1870201010201100Rapid cooling in air or waterS3150
32、0 180019009801040Rapid cooling in air or waterS31803 1870201010201100Rapid 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 1870201010201100Rapi
33、d cooling in air or waterS32304 2304 170019209251050Rapid cooling 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 25
34、07 1880206010251125Rapid cooling in air or waterS32760 1960208510701140Rapid 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 19052
35、08510401140Rapid cooling in water or byother meansS39274 1920206010251125Rapid 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
36、 or waterS82441 1870 1020 Rapid cooling in air or waterS83071 . . . 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 1839.2 The results of these analyses shall be reported to the p
37、urchaser or the purchasers representative and shall conform to therequirements specified in Section 7.9.3 If the analysis of one of the tests specified in 8.1 or 9.1 does not conform to the requirements specified in Section 7, ananalysis of each billet or pipe from the same heat or lot may be made,
38、and all billets or pipe conforming to the requirements shallbe accepted.10. Tensile and Hardness Properties10.1 The material shall conform to the tensile and hardness properties prescribed in Table 3.11. Lengths11.1 Pipe lengths shall be in accordance with the following regular practice:11.1.1 Unles
39、s otherwise agreed upon, all sizes from NPS 18 to 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 minimum lengthshall be agreed upon between the manufacturer and the purchase
40、r.NOTE 3This value applies when the inch-pound designation of this specification is the basis of purchase. When the M designation of this specificationis the basis of purchase, the corresponding metric value(s) shall be agreed upon between the manufacturer and purchaser.TABLE 2 Chemical Requirements
41、AUNSDesigna-tionBTypeC C Mn P S Si Ni Cr Mo N Cu OthersS31200 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 . .
42、 . . . .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 . . . . . .S32003 0.030 2.00 0.030 0.020 1.00 3.04.0 19.522.5 1.502.00 0.140.20 . . . . . .S32101 0.040 4.06.0 0.040 0.030 1.00 1.351.70 21.022.
43、0 0.100.80 0.200.25 0.100.80 . . .S32202 0.030 2.00 0.040 0.010 1.00 1.002.80 21.524.0 0.45 0.180.26 . . . . . .S32205 2205 0.030 2.00 0.030 0.020 1.00 4.56.5 22.023.0 3.03.5 0.140.20 . . . . . .S32304 2304 0.030 2.50 0.040 0.040 1.00 3.05.5 21.524.5 0.050.60 0.050.20 0.050.60 . . .S32506 0.030 1.00
44、 0.040 0.015 0.90 5.57.2 24.026.0 3.03.5 0.080.20 . . . W0.050.30S32520 0.030 1.5 0.035 0.020 0.80 5.58.0 24.026.0 3.05.0 0.200.35 0.53.00 . . .S32550 255 0.04 1.50 0.040 0.030 1.00 4.56.5 24.027.0 2.93.9 0.100.25 1.502.50 . . .S32707 0.030 1.50 0.035 0.010 0.50 5.59.5 26.029.0 4.05.0 0.300.50 1.0 C
45、o0.52.0S32750D 2507 0.030 1.20 0.035 0.020 0.80 6.08.0 24.026.0 3.05.0 0.240.32 0.5 . . .S32760E 0.030 1.00 0.030 0.010 1.00 6.08.0 24.026.0 3.04.0 0.200.30 0.501.00 W0.501.00S32808 0.030 1.10 0.030 0.010 0.50 7.08.2 27.027.9 0.801.20 0.300.40 . . . W2.102.50S32900 329 0.08 1.00 0.040 0.030 0.75 2.5
46、5.0 23.028.0 1.002.00 . . . . . . . . .S32906 0.030 0.801.50 0.030 0.030 0.80 5.87.5 28.030.0 1.502.60 0.300.40 0.80 . . .S32950 0.030 2.00 0.035 0.010 0.60 3.55.2 26.029.0 1.002.50 0.150.35 . . . . . .S33207 0.030 1.50 0.035 0.010 0.80 6.09.0 29.033.0 3.05.0 0.400.60 1.0S39274 0.030 1.00 0.030 0.02
47、0 0.80 6.08.0 24.026.0 2.53.5 0.240.32 0.200.80 W1.502.50S39277 0.025 0.80 0.025 0.002 0.80 6.58.0 24.026.0 3.04.0 0.230.33 1.202.00 W0.81.2S81921 0.030 2.004.00 0.040 0.030 1.00 2.004.00 19.022.0 1.002.00 0.140.20 . . . . . .S82011 0.030 2.03.0 0.040 0.020 1.00 1.002.00 20.523.5 0.101.00 0.150.27 0
48、.50 . . .S82121 . . . 0.035 1.002.50 0.040 0.010 1.00 2.004.00 21.023.0 0.301.30 0.150.25 0.201.20 . . .S82441 0.030 2.54.0 0.035 0.005 0.70 3.04.5 23.025.0 1.002.00 0.200.30 0.100.80S83071 . . . 0.030 0.501.50 0.030 0.020 0.50 6.08.0 29.031.0 3.04.0 0.280.40 0.80 . . .AMaximum, unless a range or mi
49、nimum is indicated. Where ellipses (.) appear in this table, there is no minimum and analysis for the element need not be determinedor reported.B New designation established in accordance with Practice E527 and SAE J 1086.CCommon name, not a trademark, widely used, not associated with any one producer. 329 is an AISI number
