1、Designation: A758/A758M 10A758/A758M 13Standard Specification forWrought-Carbon Steel Butt-Welding Piping Fittings withImproved Notch Toughness1This standard is issued under the fixed designation A758/A758M; the number immediately following the designation indicates the yearof original adoption or,
2、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 wrought-carbon steel butt-welding seamless or welded f
3、ittings specially processed to ensure betternotch toughness than that to be expected in fittings manufactured to the requirements of Specification A234/A234M.1.1.1 Included are elbows, caps, tees, reducers, and other type fittings covered by ASME B16.9.1.1.2 Heat treatment is required for all fittin
4、gs.1.1.3 Fittings with mandatory radiographic examination of welds are included.1.1.4 Supplementary requirements are provided for use when additional testing or examination is desired.1.1.5 Cast fittings, and fittings formed from all weld metal, are not included.1.2 Several type of fittings are prov
5、ided, as follows:TypeHeat TreatmentRequiredWeld SeamFinish (5.3.2)RadiographyRequired?30 normalize UW-35 no31 normalize UW-35 yes32 normalize UW-35 and ground flush yes40 normalize and temper UW-35 no41 normalize and temper UW-35 yes42 normalize and temper UW-35 and ground flush yes50 quench and tem
6、per UW-35 no51 quench and temper UW-35 yes52 quench and temper UW-35 and ground flush yes1.3 It shall be the responsibility of the purchaser to determine whether material meeting the requirements of this specificationis satisfactory for the service application.1.4 This specification is expressed in
7、both inch-pound units and SI units. However, unless the order specifies the applicable “M”specification designation (SI units), the material shall be furnished to inch-pound units.1.5 The values stated in either SI units or inch-pound units are to be regarded separately as standard. Within the text,
8、 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 those ref
9、erence documents listed in Specification A960/A960M, the following list of standards apply to thisspecification:2.2 ASTM Standards:2A234/A234M Specification for Piping Fittings of Wrought Carbon Steel and Alloy Steel for Moderate and High TemperatureServiceA275/A275M Practice for Magnetic Particle E
10、xamination of Steel ForgingsA960/A960M Specification for Common Requirements for Wrought Steel Piping FittingsE165 Practice for Liquid Penetrant Examination for General Industry1 This specification is under the jurisdiction ofASTM Committee A01 on Steel, Stainless Steel and RelatedAlloys and is the
11、direct responsibility of Subcommittee A01.22on Steel Forgings and Wrought Fittings for Piping Applications and Bolting Materials for Piping and Special Purpose Applications.Current edition approved Nov. 1, 2010Oct. 1, 2013. Published December 2010October 2013. Originally approved in 1978. Last previ
12、ous edition approved in 20092010as A758/A758M09.10. DOI: 10.1520/A0758_A0758M-10.10.1520/A0758_A0758M-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 standard
13、s Document Summary page on the ASTM website.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,
14、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 standardCopyright ASTM International, 100 Barr Harbor Drive,
15、PO Box C700, West Conshohocken, PA 19428-2959. United States1E709 Guide for Magnetic Particle Testing2.3 ASME Boiler and Pressure Vessel Code (ASME Code):3Section VIII, Division 1 Pressure VesselsSection IX , Welding and Brazing Qualifications2.4 ASME Standard:B16.9 Standards for Steel Butt-Welding
16、Fittings32.5 ASNT Standard:SNT-TC-1A Practice for Nondestructive Examination Personnel Qualification and Certification43. Ordering Information3.1 See Specification A960/A960M.4. General Requirements4.1 Product furnished to this specification shall conform to the requirements of Specification A960/A9
17、60M, including anysupplementary requirements that 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/A9
18、60M, this specification shall prevail.5. Materials and Manufacture5.1 The steel shall be killed and shall be melted to a fine austenitic grain size practice.5.2 The starting material shall be wrought and in the form of blooms, billets, slabs, forgings, bars, plates, sheets, seamless pipeor tube, or
19、welded-with-filler-metal pipe or tube. Cast products shall not be used.5.3 Any forming process, fusion-welding process, or combination of such processes, may be used.5.3.1 All welding shall be fusion-welded in accordance with the requirements of Section IX of the ASME Boiler and PressureVessel Code.
20、 Welding procedures, welders, and welding operators shall be qualified in accordance with Section IX of the ASMEBoiler and Pressure Vessel Code.5.3.2 All welded joints shall be finished in accordance with Paragraph UW-35 of Section VIII, Division 1, of the ASME Code.5.3.3 Welded joints of Type 32, 4
21、2, and 52 shall be ground flush.5.3.4 Welded joints of Types 31, 41, 51, 32, 42, and 52 shall be examined by radiography in accordance with the requirementsof Paragraph UW-51 of Section VIII, Division 1, of theASME Code, and shall conform to the requirements of Paragraph UW-51.5.4 Heat TreatmentAll
22、fittings shall be heat treated subsequent to final welding and forming.5.4.1 Types 30, 31, and 32 fittings shall be normalized by uniformly heating to a temperature in the austenitizing range, but notto exceed 1700 F 925 C, and subsequently removed from the furnace and air-cooled individually to roo
23、m temperature.5.4.2 Types 40, 41, and 42 fittings shall be normalized in accordance with 5.4.1.After normalizing, the fittings shall be temperedby heating to a temperature in the range from 1100 F to 1200 F 595 C to 675 C, soaking at that temperature for 12 h minimumper 1 in. 25 mm of thickness, but
24、 not less than 15 min, and then air-cooled to room temperature.5.4.3 Types 50, 51, and 52 fittings shall be quenched-and-tempered by uniformly heating to a temperature in the austenitizingrange, but not to exceed 1700 F 925 C, and then quenching in a liquid media from the austenitizing temperature t
25、o atemperature below 800 F 425 C. After quenching, the fittings shall be reheated to a temperature in the range from 1100 F to1250 F 595 C to 675 C, soaking at that temperature for 12 h minimum per 1 in. 25 mm of thickness, but not less than 15min, and then air-cooled to room temperature.6. Chemical
26、 Composition6.1 Heat or Cast AnalysisThe results shall conform to the requirements for the applicable grade as specified in Table 1.6.2 Product AnalysisThe purchaser may make a product analysis on products made to this specification in accordance withSpecification A960/A960M.6.3 The steel shall not
27、contain any unspecified elements for the 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.7. Mechanical Requirements7.1 Tensile Requirements:3 Available from American Society of Mechanical
28、 Engineers (ASME), ASME International Headquarters, Three Park Ave., New York, NY 10016-5990, http:/www.asme.org.4 Available from American Society for Nondestructive Testing (ASNT), P.O. Box 28518, 1711 Arlingate Ln., Columbus, OH 43228-0518, http:/www.asnt.org.A758/A758M 1327.1.1 The fittings, as r
29、epresented by tensile test specimens taken subsequent to final heat treatment, shall conform to therequirements for the applicable grade as specified in Table 2.7.1.2 Number and Location of Specimens:7.1.2.1 LotFor tension testing, a lot shall consist of the fittings from a heat, in each heat treatm
30、ent charge, with nominal wallthicknesses within 14 in. 6 mm of the nominal thickness of the test specimen. In addition, for Types 32, 42, and 52, the lotdefinition shall include each heat or lot of weld metal. If heat treatment is performed in a continuous or batch-type furnacecontrolled within a ra
31、nge of plus-or-minus 25 F 14 C and equipped with calibrated thermocouples and recording pyrometers,and records of heat treatment are maintained, all fittings heat treated in such a furnace are considered to be in one charge. Forfurnaces not so equipped and controlled, each batch constitutes a charge
32、.7.1.2.2 Representative Test PieceFor instances in which the tension test specimen cannot be obtained from a fitting due to sizelimitations, a representative test piece may be used. The test piece shall be from the same heat and shall be heat treated in the sameheat treatment batch or charge as the
33、fittings it represents, and shall have had approximately the same amount of working as thefittings. In addition, for fittings manufactured from bars, plate, or forgings, the test piece shall have a cross-section equal to or largerthan the greatest cross-section of the fittings it represents. Test pi
34、eces representing fittings manufactured from pipe shall have anominal outside diameter and wall thickness equal to that of the pipe from which the fitting was formed. Test pieces for fittingsfabricated by welding or formed from welded pipe shall be prepared with the same welding procedure and from t
35、he same heat orlot of weld metal as the fitting it represents.7.1.2.3 Types 30, 31, 40, 41, 50, and 51One base-metal tension test specimen shall be tested from each lot. For fittingsfabricated by welding, one transverse-weld tension test specimen shall also be made from each lot. One traverse-weld t
36、ension testspecimen shall also be required from each lot for fittings formed from welded pipe if the weld in the welded pipe was not testedin the same heat treatment condition as the fittings.7.1.2.4 Types 32, 42, and 52One base-metal and one transverse-weld tension test specimen shall be tested fro
37、m each lot.Fittings fabricated by welding or formed from welded pipe shall be tested as in 7.1.2.3.7.1.2.5 Tension test specimens shall be taken from an integral part of the fitting where practicable. All base-metal tension testsshall be conducted in the longitudinal direction. Weld metal specimens
38、shall be taken transverse to the weld.7.1.2.6 Yield strength shall be determined either by the 0.2 % offset method or the 0.5 % extension-under-load method.7.2 Transverse Guided Weld Bend TestsWelded Fittings Only:7.2.1 Number of Tests:TABLE 1 Chemical RequirementsElement Cast or HeatAnalysisCarbon,
39、 max, % 0.27Manganese, % 0.851.20Phosphorus, max, % 0.035Sulfur, max, % 0.035Silicon, % 0.150.30Vanadium, max, % 0.05Residual elementsA,BChromium, max, % 0.25Nickel, max, % 0.25Molybdenum, max, % 0.08Copper, max, % 0.35Lead, max, % 0.05AIndividual limits of chromium, nickel, molybdenum, and copper m
40、ay be exceededby 0.05 % provided that their total does not exceed 0.90 % in both the heat andproduct analysis.BThese are not to be added to the melt and shall only occur as a result ofunavoidable residuals from the melting stock.TABLE 2 Tensile RequirementsGrade 60 Grade 70Tensile strength, ksi MPa
41、60 to 85 415 to 585 70 to 95 485 to 635Yield strength,A min, ksiMPa35 240 38 260Elongation in 2 in. 50 mm,min, %Longitudinal 30 27Transverse 22 20A0.2 % offset or 0.5 % EUL.A758/A758M 1337.2.1.1 LotA lot shall be as defined in 7.1.2.1.7.2.1.2 One guided face-bend and one guided root-bend test shall
42、be made to represent each lot for fittings with a nominal wallthickness of 38 in. 10 mm and less. For fittings with a nominal wall thickness greater than 38 in. 10 mm, one guided side-bendtest shall be made to represent each lot.7.2.2 Test Specimen Location and OrientationFull thickness specimens sh
43、all be taken transverse to the weld, subsequent tofinal heat treatment, in accordance with Section IX of the ASME Boiler and Pressure Vessel Code.7.2.3 RequirementThe guided-bend test specimen shall not have any cracks or other open defects exceeding 18 in. 3 mm,measured in any direction on the conv
44、ex surface of the specimen after bending. Cracks occurring on the corners of the specimenduring testing shall not be considered unless there is definite evidence that they result from slag inclusions or other internal defects.8. Dimensions8.1 Butt-welded fittings shall conform to the dimensions and
45、tolerances specified in ASME B16.9.9. Surface Quality9.1 See Specification A960/A960M.10. Radiographic Examination10.1 Types 31, 32, 41, 42, 51, and 52 fittings shall have the entire length of each weld joint examined radiographically inaccordance with Paragraph UW-51 of Section VIII, Division 1, of
46、 the ASME Boiler and Pressure Vessel Code.10.2 Radiographic examination may be performed prior to final heat treatment.10.3 Personnel performing radiographic examination shall be qualified and certified in accordance with SNT-TC-1A-1984, orwith the approval of the purchaser, in accordance with anoth
47、er nationally-accepted standard which covers the qualification andcertification of radiographic examination personnel.11. Rework and Retreatment11.1 See Specification A960/A960M.11.2 Repair WeldingParent Metal:11.2.1 Repair welding by the manufacturer is permissible for parts made to dimensional sta
48、ndards, in ASME or equivalentstandards.11.2.2 Prior approval of the purchaser shall be required to weld repair special parts made to the purchasers requirements.11.2.3 Welding shall produce low hydrogen in the weldment.11.2.4 The product shall be heat treated in accordance with Section 5 after weld
49、repair.12. Inspection12.1 The manufacturer shall afford the purchasers inspectors all reasonable facilities necessary to satisfy him that the materialis being produced and furnished in accordance with this specification. Inspection by the purchaser shall not interfere unnecessarilywith the manufacturers operations. All tests and inspections shall be made at the place of manufacture, unless otherwise agreedto.13. Rejection and Rehearing13.1 Material that fails to conform to the requirements of this spe
