1、Designation: A790/A790M 13aA790/A790M 14Standard 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 rev
2、ision, 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 intend
3、ed 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
4、desired.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 dimension
5、s 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 exa
6、ct 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 desi
7、gnator NPS (nominal pipe size) has been substituted in this standard for such traditional terms as nominal diameter,size, and nominal size.2. Referenced Documents2.1 ASTM Standards:3A370 Test Methods and Definitions for Mechanical Testing of Steel ProductsA923 Test Methods for Detecting Detrimental
8、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 Pipe and TubingE309
9、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,AusteniticStainless Steel
10、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 Pipe2.3 SAE Standard:5SAE J 10861 This specification is under the jurisdic
11、tion ofASTM 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 May 1, 2013March 1, 2014. Published June 2013March 2014. Originally approved in 1981. Last previous edit
12、ion approved in 2013 asA790/A790M13.13a. DOI: 10.1520/A0790_A0790M-13A.10.1520/A0790_A0790M-14.2 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 contactASTM Custom
13、er 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.5 Available from Socie
14、ty of Automotive Engineers (SAE), 400 Commonwealth Dr., Warrendale, PA 15096-0001, http:/www.sae.org.This document 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 technical
15、ly possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. 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 stan
16、dardCopyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States12.4 Other Standard:6SNT-TC-1A Personal Qualification and Certification in Nondestructive Testing2.5 AWS StandardStandard:7A5.9 Corrosion-Resisting Chromium and Chromium-Nickel Steel
17、Welding Rods and Electrodes3. Terminology3.1 DefinitionsFor definitions of terms used in this 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 Qu
18、antity (feet, metres, or number of lengths),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 schedule number of average wall thickness),4.1.6 Length (specific or random) (see Sectio
19、n 11),4.1.7 End finish (section on ends of Specification A999/A999M),4.1.8 Optional requirements (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 designat
20、ion, and4.1.11 Special requirements and any supplementary requirements selected.5. General 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 Manu
21、facture6.1 Manufacture:6.1.1 The pipe shall be made by the seamless or an automatic welding 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
22、 annealing is used, pickling is not necessary.6.2 DiscardAsufficient discard shall be made 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 s
23、eamless pipe, as an alternate to final heat treatment in a continuous furnace or batch-type 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 cool
24、ed by other means, except for UNS S32950, which shall be air cooled.6.3.2 If the purchaser 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 re
25、quired by Table 1 for the particulargrade is required, provided a sample of that heat of finished 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 hea
26、t. Each pipe supplied under this requirement shall be stenciled with the suffix “HT-O.”6.3.2.2 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 th
27、e purchaser.7. Chemical Composition7.1 The steel shall conform to the chemical requirements as prescribed in Table 2.8. Heat Analysis8.1 An analysis of each heat of steel shall be made by the steel manufacturer to determine the percentages of the elementsspecified.6 Available from American Society f
28、or Nondestructive Testing (ASNT), P.O. Box 28518, 1711 Arlingate Ln., Columbus, OH 43228-0518, http:/www.asnt.org.7 Available from American Welding Society (AWS), 550 NW LeJeune Rd., Miami, FL 33126, http:/www.aws.org.A790/A790M 1429. Product Analysis9.1 At the request of the purchasers inspector, a
29、n 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 Designator Lengths of Pipe in Lot
30、Under 2 400 or fraction thereof2 to 5, incl 200 or fraction thereof6 and over 100 or fraction thereof9.2 The results of these analyses shall be reported to the purchaser or the purchasers representative and shall conform to therequirements specified in Section 7.9.3 If the analysis of one of the tes
31、ts 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, and all billets or pipe conforming to the requirements shallbe accepted.TABLE 1 Heat TreatmentUNSDesignation TypeA Temperature F C QuenchS3
32、1200 1920201010501100Rapid cooling in waterS31260 1870201010201100Rapid cooling in air or waterS31500 180019009801040Rapid cooling in air or waterS31803 1870201010201100Rapid cooling in air or waterS32003 1850205010101120Rapid cooling in air or waterS32101 1870 1020 Quenched in water or rapidlycoole
33、d by other meansS32202 1870197510201080Rapid cooling in air or waterS32205 2205 1870201010201100Rapid 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
34、 1040 min Rapid cooling in air or waterS32707 1975205010801120Rapid cooling in air or waterS32750 2507 1880206010251125Rapid cooling in air or waterS32760 1960208510701140Rapid cooling in air or waterS32808 1920210010501150Rapid cooling in air or waterS32900 329 17001750925955Rapid cooling in air or
35、 waterS32906 1870210010201150Rapid cooling in air or waterS32950 182018809901025Air coolS33207 1905208510401140Rapid cooling in water or byother meansS39274 1920206010251125Rapid cooling in air or waterS39277 1975215510801180Rapid cooling in air or waterS81921 176020109601100Rapid cooling in air or
36、waterS82011 1850205010101120Rapid cooling in air or waterS82121 18301000Rapid cooling in air or waterS82121 1830201010001100Rapid cooling in air or waterS82441 1870 1020 Rapid cooling in air or waterACommon name, not a trademark, widely used, not associated with any oneproducer. 329 is naan AISI num
37、ber.A790/A790M 14310. 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 Unless otherwise agreed upon, all sizes from NPS 18 to and
38、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 purchaser.NOTE 3This value applies when the inch-pound designa
39、tion 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.11.1.2 If definite cut lengths are desired, the lengths required shall be specified
40、 in the order. No pipe shall be less than thespecified length and no more than 14 in. 6 mm over it.11.1.3 No jointers are permitted unless otherwise specified.12. Workmanship, Finish, and Appearance12.1 The finished pipes shall be reasonably straight and shall have a workmanlike finish. Imperfection
41、s may be removed bygrinding, provided the wall thicknesses are not decreased to less than that permitted, in the Permissible Variations in WallThickness Section of Specification A999/A999M.TABLE 2 Chemical RequirementsAUNSDesigna-tionBTypeC C Mn P S Si Ni Cr Mo N Cu OthersS31200 0.030 2.00 0.045 0.0
42、30 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 . . . .
43、 . .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 4.06.0 0.040 0.030 1.00 1.351.70 21.022.0 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.
44、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 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.
45、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 Co0.52.0S32750D 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 0.05 1.00 0.030 0.010 1.00 6.08.0 24.026.0 3.04.0 0.200.30 0.501.
46、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 2.55.0 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
47、 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 0.020 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
48、.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 0.50 . . .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.
49、00 0.200.30 0.100.80AMaximum, unless a range or minimum 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
