1、Designation: A 790/A 790M 07Standard Specification forSeamless and Welded Ferritic/Austenitic Stainless SteelPipe1This standard is issued under the fixed designationA 790/A 790M; the number immediately following the designation indicates the yearof original adoption or, in the case of revision, the
2、year of last revision. A number in parentheses indicates the year of last reapproval.A superscript epsilon (e) 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 gener
3、al corro-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. T
4、hesesupplementary 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 dimensionsof welded and seamless stainless steel pipe as shown in ANSIB36.19. Pipe having other dimensions may be fu
5、rnishedprovided such pipe complies with all other requirements of thisspecification.1.4 The values stated in either inch-pound units or SI unitsare to be regarded separately as standard. Within the text, theSI units are shown in brackets. The values stated in eachsystem are not exact equivalents; th
6、erefore, each system mustbe used independently of the other. Combining values from thetwo systems may result in nonconformance with the specifi-cation. The inch-pound units shall apply unless the M desig-nation of this specification is specified in the order.NOTE 1The dimensionless designator NPS (n
7、ominal pipe size) hasbeen substituted in this standard for such traditional terms as nominaldiameter, size, and nominal size.2. Referenced Documents2.1 ASTM Standards:3A 370 Test Methods and Definitions for Mechanical Testingof Steel ProductsA 941 Terminology Relating to Steel, Stainless Steel, Re-l
8、ated Alloys, and FerroalloysA 999/A 999M Specification for General Requirements forAlloy and Stainless Steel PipeE 213 Practice for Ultrasonic Examination of Metal Pipeand TubingE 309 Practice for Eddy-Current Examination of Steel Tu-bular Products Using Magnetic SaturationE 381 Method of Macroetch
9、Testing Steel Bars, Billets,Blooms, and ForgingsE 426 Practice for Electromagnetic (Eddy-Current) Exami-nation of Seamless and Welded Tubular Products, Austen-itic Stainless Steel and Similar AlloysE 527 Practice for Numbering Metals and Alloys in theUnified Numbering System (UNS)2.2 ANSI Standards:
10、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 Qualification and Certification inNondestructive Testing2.5 AWS StandardA5.9 Corrosion-Resisting Chromium and Chromium-Nick
11、el Steel Welding Rods and Electrodes3. Terminology3.1 DefinitionsFor definitions of terms used in this speci-fication refer to Terminology A 941.4. Ordering Information4.1 Orders for material under this specification shouldinclude the following, as required, to describe the desiredmaterial adequatel
12、y:4.1.1 Quantity (feet, metres, or number of lengths),1This 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,
13、 2007. Published October 2007. Originallyapproved in 1981. Last previous edition approved in 2005 as A 790/A 790M 05b.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 ASTM website, www.astm.or
14、g, 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 10036, http:/www.ansi.org.5
15、Available 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.1*A Summary of Changes section app
16、ears at the end of this standard.Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.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 outsid
17、e diameter and sched-ule 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 A 999/A 999M),4.1.8 Optional requirements (product analysis, Section 9;hydrostatic test or nondestructive electric test, Section 14),4.1.9
18、Test report required (section on certification of Speci-fication A 999/A 999M),4.1.10 Specification designation, and4.1.11 Special requirements and any supplementary require-ments selected.5. General Requirements5.1 Material furnished under this specification shall con-form to the applicable require
19、ments of the current edition ofSpecification A 999/A 999M 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 metal inthe welding operation.6.1.2 At the manufacturers opti
20、on, 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 injurious piping and unduesegregation.6.3 All pipe shall be f
21、urnished in the heat-treated conditionas shown in Table 1. For seamless pipe, as an alternate to finalheat treatment in a continuous furnace or batch-type furnace,immediately following hot forming while the temperature ofthe pipes is not less than the specified minimum solutiontreatment temperature,
22、 pipes shall be individually quenched inwater or rapidly cooled by other means, except for UNSS32950, which shall be air cooled.7. Chemical Composition7.1 The steel shall conform to the chemical requirements asprescribed in Table 2.TABLE 1 Heat TreatmentUNSDesignationTypeATemperature F C QuenchS3120
23、0 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 rapidlycooled b
24、y other meansS32205 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 1040 min Rapid cooling in air or waterS32707 197520501
25、0801120Rapid cooling in air or waterS32750 2507 1880206010251125Rapid cooling in air or waterS32760 2010208511001140Rapid cooling in air or waterS32808 1920210010501150Rapid cooling in air or waterS32900 329 17001750925955Rapid cooling in air or waterS32906 1870210010201150Rapid cooling in air or wa
26、terS32950 182018809901025Air coolS39274 1920206010251125Rapid cooling in air or waterS39277 1975215510801180Rapid cooling in air or waterACommon name, not a trademark, widely used, not associated with any oneproducer. 329 is na AISI number.A 790/A 790M 0728. Heat Analysis8.1 An analysis of each heat
27、 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, shall be made by the manu
28、facturer.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 results of these ana
29、lyses 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 billet or pipe from the s
30、ame 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 with the followingreg
31、ular 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 2) with the permissible range of 15 to 24 ft (see Note 2).Short lengths are acceptable and the number and minimumlength shall be agreed upon between the manufa
32、cturer and thepurchaser.TABLE 2 Chemical RequirementsAUNSDesigna-tionBTypeCC 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
33、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 4.06.0 0.040 0.030 1.00 1.351.70 21.022.0 0.100.80 0.200.25 0.100.80
34、 . . .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 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
35、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 Co0.52.0S32750 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 . . .S32760 0.05 1.00 0
36、.030 0.010 1.00 6.08.0 24.026.0 3.04.0 0.200.30 0.501.00 W0.501.0040 minDS32808 0.030 1.10 0.030 0.030 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
37、 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 . . . . . .S39274 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 W 0.81.2AMaximum, unless a range or min
38、imum is indicated. Where ellipses (.) appear in this table, there is no minimum and analysis for the element need not be determinedor reported.BNew designation established in accordance with Practice E 527 and SAE J 1086.CCommon name, not a trademark, widely used, not associated with any one produce
39、r. 329 is na AISI number.D%Cr+3.33 %Mo+163 %N.A 790/A 790M 073NOTE 2This 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 th
40、e manufacturer and 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
41、Appearance12.1 The 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 A 999/A 99
42、9M.13. Mechanical Tests Required13.1 Transverse or Longitudinal Tension TestOne tensiontest shall be made on a specimen for lots of not more than 100pipes. Tension tests shall be made on specimens from 2 pipesfor lots of more than 100 pipes.13.2 Mechanical Testing Lot Definition The term lot formech
43、anical 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
44、 continuous 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,
45、 hot formed 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 larg
46、er of (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 cont
47、rolled 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 theTABLE 3 Tensile and Hardness RequirementsUNSDesignationTypeATensileStrength,min, ksiMPaYieldStrength,min,ksi MPaElongationin
48、 2 in. or50 mm,min, %Hardness, maxHBW HRCS31200 100 690 65 450 25 280 . . .S31260 100 690 65 450 25 . . . . . .S31500 92 630 64 440 30 290 30S31803 90 620 65 450 25 290 30S32003 90 620 65 450 25 290 30S32101t #0.187 in.5.00 mm101 700 77 530 30 290 . . .t0.187 in.5.00 mm94 650 65 450 30 290 . . .S322
49、05 2205 95 655 65 450 25 290 30S32304 2304 87 600 58 400 25 290 30S32506 90 620 65 450 18 302 32S32520 112 770 80 550 25 310 . . .S32550 255 110 760 80 550 15 297 31S32707 133 920 101 700 25 318 34S32750 2507 116 800 80 550 15 300 32S32760B109 750 80 550 25 270 . . .S32808 116 800 80 550 15 310 32S32900 329 9
