1、Designation: A 790/A 790M 08aStandard 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 () 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 923 Test Methods for Detecting Detrimental Intermetallic
8、Phase in Duplex Austenitic/Ferritic Stainless SteelsA 941 Terminology Relating to Steel, Stainless Steel, Re-lated 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 Practi
9、ce for Eddy-Current Examination of Steel Tu-bular Products Using Magnetic SaturationE 381 Method of Macroetch 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 Simila
10、r AlloysE 527 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 Qualification
11、 and Certification inNondestructive Testing2.5 AWS StandardA5.9 Corrosion-Resisting Chromium and Chromium-Nickel Steel Welding Rods and Electrodes3. Terminology3.1 DefinitionsFor definitions of terms used in this speci-fication refer to Terminology A 941.1This specification is under the jurisdiction
12、 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 Oct. 1, 2008. Published November 2008. Originallyapproved in 1981. Last previous edition approved in 2008 a
13、s A 790/A 790M 08.2For 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.org, orcontact ASTM Customer Service at serviceastm.org. For Annual Book of ASTMStandards volume infor
14、mation, 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.5Available from Society of Automotive Engineers (SAE), 400 CommonwealthDr., Warrendale, PA 15096-0001
15、, 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 appears at the end of this standard.Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, W
16、est Conshohocken, PA 19428-2959, United States.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 lengths),4.1.2 Name of material (ferritic/austenitic
17、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),4.1.7 End finish (section on ends of Specification A 999/A 999M),4.1.8 Optional r
18、equirements (product analysis, Section 9;hydrostatic test or nondestructive electric test, Section 14),4.1.9 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.
19、 General Requirements5.1 Material furnished under this specification shall con-form to the applicable requirements 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 anautoma
20、tic welding process, with no addition of filler 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 shal
21、l be made from eachingot to secure freedom from 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.TABLE 1 Heat TreatmentUNSDesignationTypeATemperature F C QuenchS31200 1920201010501100Rapid coo
22、ling 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 by other meansS32202 1800197
23、59801080Rapid 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 1040 min Rapid cooling in air
24、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 waterS32906 1870210010201150Ra
25、pid 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 waterACommon name, not a trademark, widely used, not associated with any oneproduc
26、er. 329 is na AISI number.A 790/A 790M 08a26.3.1 For seamless pipe, as an alternate to final heat treat-ment in a continuous furnace or batch-type furnace, immedi-ately following hot forming while the temperature of the pipesis not less than the specified minimum solution treatmenttemperature, pipes
27、 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 treatmentsubsequent to welding, the purchase order shall specify thefollowing condition:6.3.2.1 No final heat treatment of pipe f
28、abricated 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 that heat of pipe asa prolongation of the weld passes the Test Methods A 923Method B or C (See Note 2), including ba
29、se 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 Test MethodsA 923, the HT-O provision does not apply.NOTE 2The Test Methods A 923 test method (B or C) is at themanu
30、facturers 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 analysis of each heat of steel shall be made by thesteel manufacturer to determine the percentages of the ele-m
31、ents 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 manufacturer.A lot of pipe shall consist of the following number of lengthsof the same size an
32、d 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 analyses shall be reported to thepurchaser or the purchasers representative and shall conform
33、to 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 same heat or lot may bemade, and all billets or pipe conforming to the requirementsshall be
34、 accepted.10. Tensile and Hardness Properties10.1 The material shall conform to the tensile and hardnessproperties prescribed in Table 3.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 . . . . . .
35、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
36、.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 22.023.0 3.03.5 0.140.20 . . . . . .S32304 2304 0.030 2.
37、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 1.50 0.040 0.030 1.00 4.56.5 24.027.0 2.93.9 0.100.25 1
38、.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 0.030 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
39、.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 26.029.0 1.002.50 0.150.35 . . . . . .S33207 0.
40、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 W 0.81.2AMaximum, unless a range or minimum is indicated. Where ellipses (.) a
41、ppear 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 producer. 329 is na AISI number.D%Cr+3.33 %Mo+
42、163 %N.A 790/A 790M 08a311. Lengths11.1 Pipe lengths shall be in accordance 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).Shor
43、t lengths are acceptable and the number and minimumlength shall be agreed upon 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 c
44、orresponding metric value(s)shall be agreed upon between the 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 permitt
45、ed unless otherwise specified.TABLE 3 Tensile and Hardness RequirementsUNSDesignationTypeATensileStrength,min, ksiMPaYieldStrength,min,ksi MPaElongationin 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 30S3180
46、3 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 . . .S32202 94 650 65 450 30 290 30S32205 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 55
47、0 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 25 300 . . .S32808 116 800 80 550 15 310 32S32900 329 90 620 70 485 20 271 28S32906Wall below0.40 in.10 mm116 800 94 650 25 300 32Wall 0.40 in.10 mmand above109
48、750 80 550 25 300 32S32950 100 690 70 480 20 290 30S33207Wall below0.157 in. (4 mm)138 950 112 770 15 336 36Wall 0.157 in.(4 mm) and above123 850 101 700 15 336 36S39274 116 800 80 550 15 310 32S39277 120 825 90 620 25 290 30ACommon name, not a trademark, widely used, not associated with any oneproducer. 329 is na AISI number.BPrior to A 790/A 790M 04, the tensile strength value for UNS 32760 was109130 ksi 750895 MPa.A 790/A 790M 08a412. Workmanship, Finish, and Appearance12.1 The finished pipes shall be reasonably straight andshall have a workmanlik
