1、Designation: A778/A778M 15A778/A778M 16Standard Specification forWelded, Unannealed Austenitic Stainless Steel TubularProducts1This standard is issued under the fixed designation A778/A778M; the number immediately following the designation indicates the yearof original adoption or, in the case of re
2、vision, 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 specification covers straight seam and spiral butt seam welded unannealed austenitic stainle
3、ss steel tubular productsintended for low and moderate temperatures and corrosive service where heat treatment is not necessary for corrosion resistance.Table 1 lists the five grades covered by this specification. The user of this specification should be aware that a minimum amountof testing and exa
4、mination is required of the basic product. The user requiring additional testing or examination is referred to thesupplemental requirements or Ordering Information, or both. Users requiring a tubular product with post-weld heat treatment orwith radiographic examination are referred to Specification
5、A312/A312M, A358/A358M, or A409/A409M, as applicable.1.2 This specification covers welded unannealed tubular products 3 in. 75 mm through 48 in. 1200 mm in outside diameterand in nominal wall thicknesses of 0.062 in. 1.57 mm through 0.500 in. 12.70 mm produced to this specification. Tubularproducts
6、having other diameters or wall thickness, or both, may be furnished provided it complies with all other requirements ofthis specification.1.3 The values stated in either inch-pound units or SI units are to be regarded separately as standard. Within the text, SI unitsare shown in brackets. The values
7、 stated in each system may not be exact equivalents; therefore, each system shall be usedindependently of the other. Combining the 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 specifie
8、d in the order.2. Referenced Documents2.1 ASTM Standards:2A240/A240M Specification for Chromium and Chromium-Nickel Stainless Steel Plate, Sheet, and Strip for Pressure Vessels andfor General ApplicationsA262 Practices for Detecting Susceptibility to Intergranular Attack in Austenitic Stainless Stee
9、lsA312/A312M Specification for Seamless, Welded, and Heavily Cold Worked Austenitic Stainless Steel PipesA358/A358M Specification for Electric-Fusion-WeldedAustenitic Chromium-Nickel Stainless Steel Pipe for High-TemperatureService and General ApplicationsA370 Test Methods and Definitions for Mechan
10、ical Testing of Steel ProductsA409/A409M Specification for Welded Large Diameter Austenitic Steel Pipe for Corrosive or High-Temperature ServiceA700 Guide for Packaging, Marking, and Loading Methods for Steel Products for ShipmentA941 Terminology Relating to Steel, Stainless Steel, Related Alloys, a
11、nd FerroalloysA999/A999M Specification for General Requirements for Alloy and Stainless Steel PipeE340 Practice for Macroetching Metals and AlloysE527 Practice for Numbering Metals and Alloys in the Unified Numbering System (UNS)2.2 AWS Standards:A5.4 CorrosionResisting Chromium and Chromium-Nickel
12、Steel Covered Welding Electrodes3A5.9 CorrosionResisting Chromium and Chromium-Nickel Steel Welding Rods and Bare Electrodes31 This specification is under the jurisdiction ofASTM Committee A01 on Steel, Stainless Steel and RelatedAlloys and is the direct responsibility of Subcommittee A01.10on Stain
13、less and Alloy Steel Tubular Products.Current edition approved Sept. 1, 2015May 1, 2016. Published September 2015May 2016. Originally approved in 1980. Last previous edition approved in 20092015 asA778 01 (2009)A778 15.1. DOI: 10.1520/A0778_A0778M-15.10.1520/A0778_A0778M-16.2 For referencedASTM stan
14、dards, visit theASTM website, www.astm.org, or contactASTM Customer Service at serviceastm.org. For Annual Book of ASTM Standardsvolume information, refer to the standards Document Summary page on the ASTM website.3 Available from American Welding Society (AWS), 550 NW LeJeune Rd., Miami, FL 33126,
15、http:/www.aws.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 technically possible to adequately depict all changes accurately, ASTM recommends that users
16、 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 standardCopyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshoho
17、cken, PA 19428-2959. United States12.3 SAE Standard:SAE J1086 Practice for Numbering Metals and Alloys (UNS)43. Terminology3.1 Definitions:3.2 The definitions in Specification A999/A999M and Terminology A941 are applicable to this specification.4. Ordering Information4.1 Orders for material to this
18、specification should include the following:4.1.1 Quantity (feet, metres, or number of pieces),4.1.2 Name of material (welded unannealed austenitic stainless steel tubular products),4.1.3 Straight seam or spiral butt seam,4.1.4 Grade (see Table 1),4.1.5 Size (outside diameter and specified wall thick
19、ness) (see 10.3 and 10.4),4.1.6 Length (mill standard lengths, or specify cut lengths) (see 10.1),4.1.7 Optional requirements (Supplementary Requirements S1 to S5),4.1.8 Certification requirements,4.1.9 Specification designation, and4.1.10 Special requirements.5. Significance and Use5.1 It is antici
20、pated that the ASTM Subcommittees A01.06, A01.10, A01.17, A01.22, and A01.28 will use the standardcomposition limits listed in this specification for the grades identified by the corresponding UNS designation in the productspecification unless there is a specific technical justification for doing ot
21、herwise. The compositions in this specification shall notbe considered as chemical requirements for any particular product until adopted by the subcommittee overseeing that product.6. Manufacture6.1 The tubular products shall be made from flat-rolled steel sheet, coil, or plate by a shielded arc-wel
22、ding process. The materialused for manufacture shall conform to the requirements of one of the grades of Specification A240/A240M listed in Table 1. Atthe manufacturers option, filler metal may be used.6.2 Tubular products 14 in. 350 mm in diameter and smaller shall have a single longitudinal weld o
23、r a spiral butt weld seam.Tubular products of larger diameter may have a maximum of three longitudinal welds. All weld tests, examinations, inspections,or treatments are to be performed on each weld seam.6.3 Circumferentially welded joints of the same quality as the longitudinal or spiral joints sha
24、ll be permitted by agreementbetween the manufacturer and the purchaser.6.4 All tubular products shall be furnished clean and free of scale.6.5 Welding:6.5.1 The welds shall be made by the manual or automatic electric-welding process.4 Available from Society of Automotive Engineers (SAE), 400 Commonw
25、ealth Dr., Warrendale, PA 15096-0001, http:/www.sae.org.TABLE 1 Chemical RequirementsGrade UNSDesignationA CarbonmaxBManga-nese,maxPhos-phorus,maxComposition, %TitaniumColumbiumPlusTantalumNitrogen,maxSulfur,max Silicon,max Chromium NickelTP 304L S30403 0.030 2.00 0.045 0.030 1.00 18.020.0 8.013.0 .
26、 . . 0.10TP 316L S31603 0.030 2.00 0.045 0.030 1.00 16.018.0 10.014.0 2.003.00. . 0.10TP 317L S31703 0.030 2.00 0.045 0.030 1.00 18.020.0 11.015.0 3.04.0. . 0.10TP 321 S32100 0.08 2.00 0.045 0.030 1.00 17.019.0 9.012.0 . C . .TP 347 S34700 0.08 2.00 0.045 0.030 1.00 17.019.0 9.012.0 . . D .A New des
27、ignation established in accordance with Practice E527 and SAE J1086.B The carbon analysis shall be reported to the nearest 0.01 %, except for the low carbon (0.030) types, which shall be reported to the nearest 0.001 %.C The titanium content shall be not less than five times the carbon content and n
28、ot more than 0.70 %.D The columbium plus tantalum content shall be not less than ten times the carbon content and not more than 1.10 %.A778/A778M 1626.5.2 The welded joints may show a reinforcing bead no greater than 116 in. 1.57 mm on either surface of the tubular product.At no place shall the thic
29、kness of the weld section be less than the minimum wall thickness permitted by the tolerances of 10.4.The weld bead may be removed at the option of the manufacturer or upon agreement between the manufacturer and purchaser.6.5.3 Injurious weld defects shall be repaired by removal to sound metal and r
30、ewelding.6.5.4 The alloy content (chromium, nickel, molybdenum, columbium, and carbon) of the filler metal shall conform to thatrequired for the plate or the welding electrodes as shown in Table II of SpecificationAWSA5.4 or in Table I of SpecificationAWSA5.9, except that when welding on Type 321 ba
31、se metal, the deposited weld metal may correspond to Type 347.7. Mechanical Test Requirements7.1 Each lot shall be subjected to one transverse tension test and two transverse guided bend tests.NOTE 1The term lot applies to all pipe of the same grade, of the same thickness, produced from the same hea
32、t with the same weld procedure.7.2 The maximum lot size shall be in accordance with the following table:Diameter Range Lot Size (lengths)up to 3 in. 75 mm exclusive 40038 in. 75200 mm exclusive 3003 in. 75 mm to 8 in. 200 mm exclusive 300814 in. 200350 mmexclusive2008 in. 200 mmto 14 in. 350 mm excl
33、usive20014 in. 350 mm and over 1007.3 Specimen Preparation:7.3.1 Transverse tension and bend test specimens shall be taken from the end of a length and shall be flattened cold before finalmachining to size.7.3.2 As an alternative to the requirements of 7.3.1, the test specimens may be taken from tes
34、t plates of the same material asthe tube, which are attached to the end of the cylinder and welded as a prolongation of the tube longitudinal weld.7.3.3 Tension test specimens shall be made in accordance with Test Methods and Definitions A370.7.4 Transverse Tension Test:7.4.1 Transverse tension test
35、s taken transversely across the welded joint shall meet the same minimum tensile strength as thebase material (Table 2).7.4.2 When diameters below 8-in. 200 mm make it impractical to perform a transverse tension test, an alternative test maybe permitted by agreement between the manufacturer and the
36、purchaser.7.5 Transverse GuidedBend Weld Test:7.5.1 Take two bend test specimens transversely from the weld. Subject one to a face guided-bend test and the second to a rootguided-bend test. Bend one specimen with the inside surface of the tube against the plunger, and the other with the outside surf
37、aceagainst the plunger.7.5.2 The bend test shall be acceptable if no cracks or other defects exceeding 18 in. 3.17 mm in any direction are present inthe weld metal or between the weld and the parent metal after bending. Cracks that originate along the edges of the specimenduring testing, and that ar
38、e less than 14 in. 6.35 mm measured in any direction shall not be considered.7.5.3 Make and test transverse guided-bend weld test specimens in accordance with Test Methods and Definitions A370.7.5.4 When diameters below 8 in. 200 mm make it impractical to perform a transverse guided-bend test, a fla
39、ttening test maybe substituted (see Supplementary Requirement S5).8. Heat Treatment8.1 Heat treatment shall not be required.9. Chemical Requirements9.1 Mill certificates of heat analysis of each heat of steel shall be furnished upon request.TABLE 2 Tensile RequirementsGrade UNSDesignationTensileStre
40、ngth, min,ksi MPaTP 304L S30403 70 485TP 316L S31603 70 485TP 317L S31703 75 515TP 321 S32100 75 515TP 347 S34700 75 515A778/A778M 16310. Permissible Variations in Tubular Products Dimensions10.1 LengthsTubular products are normally furnished in mill lengths 10 ft 3 m and over. If specific lengths a
41、re ordered, nolength shall be under the length specified and not more than 14 in. 6.35 mm over that specified.10.2 StraightnessUsing a 10-ft 3-m straightedge placed so that both ends are in contact with the length, a maximum of a0.25-in. 6.35-mm gap is allowable.10.3 Diameter ToleranceRefer to the a
42、pplicable table in Specification A999/A999M.10.4 Wall ThicknessWall thickness tolerance shall be 612.5 %.11. Workmanship11.1 Finished products shall have smooth ends free of burrs. Tubular products shall be free of injurious defects and shall havea workmanlike finish. Surface imperfections, such as
43、handling marks, straightening marks, light mandrel and die marks, shallowpits, and scale patterns, will not be considered as serious defects, provided the imperfections are removable within the allowablewall thickness tolerance. The removal of surface imperfections is not required.12. Inspection12.1
44、 The inspector representing the purchaser shall have entry at all times while work on the contract of the purchaser is beingperformed, to all parts of the manufacturers works that concern the manufacture of the material ordered. The manufacturer shallafford the inspector all reasonable facilities to
45、 satisfy him that the material is being furnished in accordance with this specification.All required tests and inspections shall be made at the place of manufacture prior to shipment, unless otherwise specified, and shallbe conducted so as not to interfere unnecessarily with the operation of the wor
46、ks.13. Rejection13.1 Each length of tube received from the manufacturer may be inspected by the purchaser. If it does not meet the requirementsof this specification based on the inspection and test method as outlined, the length may be rejected and the manufacturer shallbe notified. Disposition of r
47、ejected lengths shall be a matter of agreement between the manufacturer and the purchaser.14. Certification14.1 A certification that the material conforms to the requirements of this specification shall be the basis of acceptance of thematerial. When requested by the purchaser, the manufacturer shal
48、l report to the purchaser or his representative the results of anysupplemental test requirements.15. Product Marking15.1 Each length of tube shall be legibly marked with the manufacturers name or brand, specified size, heat number, thisspecification number, grade of material, and the letters HT-O to
49、 indicate that the pipe was not heat treated.15.2 For small-diameter tubes and pieces under 3 ft 0.90 m in length, the information specified in 15.1 shall be marked ona tag securely attached to the bundle or box in which the pieces are shipped.16. Packaging16.1 Tubular products may be shipped loose. The manufacturer may, at his option, box, crate, or package in secure lifts orbundles to ensure safe delivery as specified in Practices A700.17. Keywords17.1 austenitic stainless steel; stainl
