1、Designation: A774/A774M 09A774/A774M 13Standard Specification forAs-Welded Wrought Austenitic Stainless Steel Fittings forGeneral Corrosive Service at Low and ModerateTemperatures1This standard is issued under the fixed designation A774/A774M; the number immediately following the designation indicat
2、es the yearof original adoption or, in the case of revision, 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 five grades of as-
3、welded, wrought austenitic stainless steel fittings for low-pressure piping andintended for low and moderate temperatures and general corrosive service. Users should note that certain corrosive conditions mayrestrict the use of one or more grades. For applications requiring a product that requires h
4、eat treatment or full pressure rating, referto Specification A403/A403M. The term “fittings” applies to butt and socket welding parts such as 45 and 90 elbows, tees,reducers, wyes, laterals, crosses, and stub ends.1.2 This specification covers as-welded fittings 3 through 48 in. 75 through 1225 mm i
5、n outside diameter and in nominal wallthicknesses 0.062 through 0.500 in. 1.6 through 12.7 mm. Table 1 and Table 2 list the common diameters and nominal thicknessesof fittings in this specification.1.3 This specification does not apply to cast fittings. Cast austenitic steel fittings are covered by
6、Specification A351/A351M.1.4 Optional supplementary requirements are provided for fittings where a greater degree of examination is desired. Thesesupplementary requirements call for additional tests. When desired, one or more of these may be specified in the order.1.5 This specification is expressed
7、 in both inch-pound units and in SI units. However, unless the order specifies the applicable“M” specification designation (SI units), the material shall be furnished to inch-pound units.1.6 The values stated in either SI units or inch-pound units are to be regarded separately as standard. Within th
8、e text, the SI unitsare shown in brackets. The values stated in each system may not be exact equivalents; therefore, each system shall be usedindependently of the other. Combining values from the two systems may result in non-conformance with the standard.2. Referenced Documents2.1 In addition to th
9、ose reference documents listed in Specification A960/A960M, the following list of standards apply to thisspecification:2.2 ASTM Standards:2A240/A240M Specification for Chromium and Chromium-Nickel Stainless Steel Plate, Sheet, and Strip for Pressure Vessels andfor General ApplicationsA351/A351M Spec
10、ification for Castings, Austenitic, for Pressure-Containing PartsA403/A403M Specification for Wrought Austenitic Stainless Steel Piping FittingsA960/A960M Specification for Common Requirements for Wrought Steel Piping FittingsE527 Practice for Numbering Metals and Alloys in the Unified Numbering Sys
11、tem (UNS)2.3 ASME Standard:Section IX , Welding Qualtifications,Qualifications, ASME Boiler and Pressure Vessel Code31 This specification is under the jurisdiction ofASTM Committee A01 on Steel, Stainless Steel and RelatedAlloys and is the direct responsibility of Subcommittee A01.22on Steel Forging
12、s and Wrought Fittings for Piping Applications and Bolting Materials for Piping and Special Purpose Applications.Current edition approved Oct. 1, 2009Oct. 1, 2013. Published November 2009October 2013. Originally approved in 1980. Last previous edition approved in 20062009as A774/A774M 06.A774/A774M
13、09. DOI: 10.1520/A0774_A0774M-09. 10.1520/A0774_A0774M-13.2 For referencedASTM standards, 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 A
14、vailable from American Society of Mechanical Engineers (ASME), ASME International Headquarters, Three Park Ave., New York, NY 10016-5990, http:/www.asme.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
15、 to the previous version. Becauseit may not be technically 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 Su
16、mmary 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 States12.4 MSS Standard:SP 43 Wrought Stainless Steel Butt Welding Fittings42.5 AWS Standards:A5.4 Corrosion-Resisting Chromium and C
17、hromium-Nickel Steel Covered Welding Electrodes5A5.9 Corrosion-Resisting Chromium and Chromium-Nickel Steel Welding Rods and Bare Electrodes52.6 SAE Standard:J1086 Unified Numbering System for Metals and Alloys63. Ordering Information3.1 See Specification A960/A960M and the following:3.1.1 Dimension
18、s (outside diameter and specified wall thickness, see Table 1 and Table 2),3.1.2 Grade (Table 3), and3.1.3 End use, if known.4. General Requirements4.1 Product furnished to this specification shall conform to the requirements of Specification A960/A960M, including anysupplementary requirements that
19、are indicated in the purchase order. Failure to comply with the requirements of SpecificationA960/A960M constitutes non-conformance with this specification. In case of a conflict between the requirements of thisspecification and Specification A960/A960M, this specification shall prevail.5. Manufactu
20、re5.1 The fittings shall be made from flat-rolled steel, such as in Specification A240/A240M. The flat rolled steel shall be in thesolution annealed condition unless other heat treat conditions are agreed upon by the manufacturer and the purchaser. The fittingsshall be formed by a hot or cold proces
21、s, and welded by a shielded welding process with or without the addition of filler metal.4 Available from Manufacturers Standardization Society of the Valve and Fittings Industry (MSS), 127 Park St., NE, Vienna, VA 22180-4602, http:/www.mss-.5 Available from American Welding Society (AWS), 550 NW Le
22、Jeune Rd., Miami, FL 33126, http:/www.aws.org.6 Available from Society of Automotive Engineers (SAE), 400 Commonwealth Dr., Warrendale, PA 15096-0001, http:/www.sae.org.TABLE 1 Common Tubular Fittings Sizes, Outside DiameterAin. mm in. mm3 76 1234 325312 90 14 3554 100 16 405412 115 18 4606 150 20 5
23、10658 170 24 6108 205 30 760858 220 36 91510 255 40 10151034 275 42 107012 305 48 1220A Other sizes may be furnished provided they comply with all other requirementsof this specification.TABLE 2 Common Tubular Fittings Nominal ThicknessesAin. or gage in. mm16 gage 0.062 1.614 gage 0.078 2.012 gage 0
24、.109 2.811 gage 0.125 3.210 gage 0.140 3.68 gage 0.172 4.4316 in. 0.187 4.814 in. 0.250 6.4516 in. 0.312 8.038 in. 0.375 9.512 in. 0.500 12.5A Other thicknesses may be furnished provided they comply with all otherrequirements of this specification.A774/A774M 1325.2 Fittings shall be furnished clean
25、and free of scale.5.3 Welding:5.3.1 The joints shall be full penetration double-welded or single-welded butt joints employing fusion-welding processes withor without the addition of filler metal as defined under Definitions, ASME Boiler and Pressure Vessel Code, Section IX. Thisspecification makes n
26、o provision for any difference in weld quality requirements regardless of the weld joint-type employed (singleor double) in making the weld. Welding procedures and welding operators shall be qualified in accordance withASME Boiler andPressure Vessel Code, Section IX.5.3.2 For fittings employing mult
27、iple passes, the root-pass may be made without the addition of filler metal.5.3.3 The alloy content (chromium, nickel, molybdenum, columbium, and tantalum) of the deposited weld metal shall conformto that required of the base metal or for equivalent weld metal as given in the AWS filler metal specif
28、ication A5.4 or A5.9, exceptthat, when welding on Types 304L base metal, the deposited weld metal shall correspond, respectively, to AWS Types E308L(ER308L) and, when welding on Type 321 base metal, the weld metal shall correspond to AWS Types E347 (ER347 or ER321).6. Chemical Composition6.1 The ste
29、el shall conform to requirements of chemical composition for the respective material prescribed in Table 3.6.2 The purchaser may make a product analysis on products made to this specification in accordance with SpecificationA960/A960M.6.3 The steel shall not contain any unspecified elements for the
30、ordered grade to the extent that it conforms to the requirementsof another grade for which that element is a specified element having a required minimum content.6.4 Mill certificates of analysis of each heat of steel shall be furnished on request.7. Mechanical Properties7.1 The material used in maki
31、ng these fittings shall conform to the test requirements listed in Table 4 for the specified grade.Mechanical tests made on the sheet or plate by the manufacturer shall qualify the sheet or plate material.TABLE 3 Chemical RequirementsNOTE 1Where an ellipsis (.) appears in this table, there is no req
32、uirement.Composition, %Grade UNSDesigna-tionACarbon,maxBMan-ganese,maxPhos-phorus,maxSulfur,maxSilicon,maxChromium Nickel Molybdenum Tita-niumColum-bium plusTantalumNitro-gen,maxTP 304L S30403 0.030 2.00 0.045 0.030 1.00 18.020.0 8.012.0 . . . . . . . . . 0.10TP 316L S31603 0.030 2.00 0.045 0.030 1.
33、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 designatio
34、n 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, that shall be reported to the nearest 0.001 %.C Ti = 5X(C+N) 0.70.D The columbium plus tantalum content shall be not less than ten times
35、 the carbon content and not more than 1.10 %.TABLE 4 Mechanical Test RequirementsTypeA UNSDesignationTensileStrengthYieldStrengthElongation in2 in.50 mm,min, %Hardness, maxBksi MPa ksi MPa Brinell RockwellB304L S30403 70-95 485-65525 170 40.0 183 88316L S31603 70-95 485-65525 170 40.0 217 95317L S31
36、703 75-100 515-69030 205 35.0 217 95321 S32100 75-100 515-69030 205 40.0 217 95347 S34700 75-100 515-69030 205 40.0 202 92A Unless otherwise indicated, a grade designation originally assigned by the American Iron and Steel Institute (AISI).B Either Brinell or Rockwell B Hardness is permissible.A774/
37、A774M 1337.2 Mechanical properties of fittings made to this specification are not verified unless specific tests and limits have been agreedupon between the purchaser and manufacturer.8. Heat Treatment8.1 Heat treatment is not required (see 16.1).9. Permissible Variations in Nominal Dimensions9.1 Re
38、fer to MSS SP 43 for tolerances for fittings covered by this specification. For fittings not covered in MSS SP 43 (wyesand laterals) acceptance limits must be agreed upon between the purchaser and manufacturer.10. Hydrostatic Tests10.1 Hydrostatic testing of the fittings is not required by this spec
39、ification.11. Surface Quality11.1 See Specification A960/A960M.11.2 When the removal of a surface discontinuity reduces the wall thickness below 8712 % of the specified nominal wallthickness at any point, the fitting shall be subject to rejection or to repair as provided in Section 14.12. Inspection
40、12.1 The manufacturer shall afford the purchasers inspector all reasonable facilities necessary to satisfy him that the materialis being furnished in accordance with the specification. Mill inspection by the purchaser shall not interfere unnecessarily with themanufacturers operations. All tests and
41、inspections shall be made at the place of manufacture, unless otherwise agreed to.12.2 Other tests, when required by agreement, shall be made from material of the lots covered in the order.NOTE 1A lot shall consist of all fittings of the same type, size, and wall thickness, manufactured from one hea
42、t of material and using one lot numberof electrode or one heat of weld wire.13. Repair of Defects13.1 Injurious defects that are deeper than the minimum specified in Section 12 may be repaired with the approval of thepurchaser. Such defects shall be entirely removed by either chipping, machining, or
43、 grinding before welding. Rewelding shall bein accordance with 5.3 of this specification.14. Rejection and Rehearing14.1 Material that fails to conform to the requirements of this specification may be rejected. Rejection should be reported to theproducer or supplier promptly and in writing. In case
44、of dissatisfaction with the results of the test, the producer or supplier maymake claim for rehearing.14.2 Fittings that develop defects in shop working or application operations may be rejected. Upon rejection the manufacturershall be notified in writing.15. Certification15.1 See Test reports are r
45、equired for all fittings covered by this specification. Each test report shall meet the requirements forcertification in Specification A960/A960M. as well as include the following information specific to this specification:15.1.1 Chemical analysis results, Section 6 (Table 3), reported results shall
46、 be to the same number of significant figures as thelimits specified in Table 3 for that element.15.1.2 Tensile property results, Section 7 (Table 2) report yield strength and tensile strength in ksi MPa and elongation inpercent, and15.1.3 Any supplementary testing required by the purchase order.16.
47、 Product Marking16.1 Each fitting shall be legibly marked with the manufacturers name or brand, the schedule number or pressure class orthickness, the specified size, the specification number, the grade of material listedIn addition to marking requirements ofSpecification A960/A960M in Table 1, the
48、heat number or manufacturers heat identification, and additional marking of the letters“HT-O” to indicate that there has been no heat treating after welding or forming. forming is required.NOTE 2For purposes of identification marking, the manufacturer is considered the organization that certifies th
49、e piping component complies with thespecification.16.2 The specification year of issue and revision letter, if any, are not required for product marking.A774/A774M 13417. Packaging17.1 The manufacturer shall box, crate, or package in secure lifts or bundles to ensure safe delivery. If specified, the ends shallbe protected with wooden or plastic plugs. Special packaging requiring extra operations other than those above must be specifiedby the purcha
