1、Designation: A234/A234M 14A234/A234M 15 Used in USDOE-NE StandardsStandard Specification forPiping Fittings of Wrought Carbon Steel and Alloy Steel forModerate and High Temperature Service1This standard is issued under the fixed designation A234/A234M; the number immediately following the designatio
2、n indicates 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.This standard has been approved for use by agenc
3、ies of the U.S. Department of Defense.1. Scope*1.1 This specification2 covers wrought carbon steel and alloy steel fittings of seamless and welded construction covered by thelatest revision of ASME B16.9, B16.11, MSS-SP-79, MSS-SP-83, MSS-SP-95, and MSS-SP-97. These fittings are for use inpressure p
4、iping and in pressure vessel fabrication for service at moderate and elevated temperatures. Fittings differing from theseASME and MSS standards shall be furnished in accordance with Supplementary Requirement S58 of Specification A960/A960M.1.2 Optional supplementary requirements are provided for fit
5、tings where a greater degree of examination is desired. Whendesired, one or more of these supplementary requirements may be specified in the order.1.3 This specification does not cover cast welding fittings or fittings machined from castings. Cast steel welding fittings aregoverned by Specifications
6、 A216/A216M and A217/A217M.1.4 This specification is expressed 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.1.5 The values stated in either SI units or inch-po
7、und units are to be regarded separately as standard. Within the 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
8、with the standard.2. Referenced Documents2.1 In addition to those reference documents listed in Specification A960/A960M, the following list of standards apply to thisspecification.2.2 ASTM Standards:3A216/A216M Specification for Steel Castings, Carbon, Suitable for Fusion Welding, for High-Temperat
9、ure ServiceA217/A217M Specification for Steel Castings, Martensitic Stainless and Alloy, for Pressure-Containing Parts, Suitable forHigh-Temperature ServiceA960/A960M Specification for Common Requirements for Wrought Steel Piping Fittings2.3 ASME Standards:4B16.9 Steel Butt-Welding FittingsB16.11 Fo
10、rged Steel Fittings, Socket Welding and Threaded2.4 ASME Boiler and Pressure Vessel Code:4Section VSection VIII, Division 1Section IX1 This specification is under the jurisdiction ofASTM Committee A01 on Steel, Stainless Steel and RelatedAlloys and is the direct responsibility of Subcommittee A01.22
11、on Steel Forgings and Wrought Fittings for Piping Applications and Bolting Materials for Piping and Special Purpose Applications.Current edition approved Oct. 1, 2014Sept. 1, 2015. Published October 2014September 2015. Originally approved in 1940. Last previous edition approved in 20132014as A234/A2
12、34M1314.1. DOI: 10.1520/A0234_A0234M-14.10.1520/A0234_A0234M-15.2 For ASME Boiler and Pressure Vessel Code applications see related Specification SA-234 in Section II of that Code.3 For referencedASTM standards, visit theASTM website, www.astm.org, or contactASTM Customer Service at serviceastm.org.
13、 For Annual Book of ASTM Standardsvolume information, refer to the standards Document Summary page on the ASTM website.4 Available from American Society of Mechanical Engineers (ASME), ASME International Headquarters, Two Park Ave., New York, NY 10016-5990, http:/www.asme.org.This document is not an
14、 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 consult prior editions as appropriate. I
15、n 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 Conshohocken, PA 19428-2959. United States12.5 MS
16、S Standards:5MSS-SP-25 Standard Marking System for Valves, Fittings, Flanges, and UnionsMSS-SP-79 Socket Welding Reducer InsertsMSS-SP-83 Steel Pipe Unions, Socket-Welding and ThreadedMSS-SP-95 Swage(d) Nipples and Bull PlugsMSS-SP-97 Integrally Reinforced Forged Branch Outlet FittingsSocket Welding
17、, Threaded and Buttwelding Ends2.6 ASNT Standard:6SNT-TC-1A Recommended Practice for Nondestructive Testing Personnel Qualification and Certification2.7 AWS Specifications7A5.5/A5.5M Specification for Low-Alloy Steel Electrodes for Shielded Metal Arc WeldingA5.23/A5.23M Specification for Low-Alloy S
18、teel Electrodes and Fluxes for Submerged Arc WeldingA5.28/A5.28M Specification for Low-Alloy Steel Electrodes for Gas Shielded Arc WeldingA5.29/A5.29M Low-Alloy Steel Electrodes for Flux Cored Arc Welding3. Ordering Information3.1 See Specification A960/A960M.4. General Requirements4.1 Product furni
19、shed to this specification shall conform to the requirements of Specification A960/A960M, 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
20、of a conflict between the requirements of thisspecification and Specification A960/A960M, this specification shall prevail.5. Materials5.1 The starting material for fittings shall be fully killed steel, consisting of forgings, bars, plates, sheet, and seamless orfusion-welded tubular products with f
21、iller metal added and shall conform to the chemical requirements of Table 1. Unless otherwisespecified for carbon steel plates and sheet, the steel may be made to either coarse grain or fine grain practice. Grade WP9 shallbe made to fine grain practice.5.2 A starting material specification that spec
22、ifically requires the addition of any element beyond those listed for the materialsin Table 1 for the applicable grade of material is not permitted. This does not preclude the use of deoxidizers or the judicious useof elements for grain size control.6. Manufacture6.1 Forging or shaping operations ma
23、y be performed by hammering, pressing, piercing, extruding, upsetting, rolling, bending,fusion welding, machining, or by a combination of two or more of these operations. The forming procedure shall be so appliedthat it will not produce injurious imperfections in the fittings.6.2 Fittings NPS-4 and
24、under may be machined from hot-forged or rolled, cold-sized, and straightened bar stock having thechemical composition of the Grade in Table 1 and the mechanical properties of the Grade in Table 2. Heat treatment shall be inaccordance with Section 7. All caps machined from bar stock shall be examine
25、d by liquid penetrant or magnetic particle inaccordance with S52 or S53 in Specification A960/A960M.6.3 All welds including welds in tubular products from which fittings are made shall be (1) made by welders, welding operators,and welding procedures qualified under the provisions of ASME Section IX,
26、 (2) heat treated in accordance with Section 7 of thisspecification, and (3) radiographically examined throughout the entire length of each weld in accordance with Article 2, ASMESection V with acceptance limits in accordance with Paragraph UW-51 of ASME Section VIII, Division 1 of the ASME BoilerSA
27、W, A5.23/A5.23M EB9 + flux; GTAW, A5.28/A5.28M ER90S-B9; and FCAW A5.29/A5.29M E91T1-B9. Inaddition, the Ni+Mn content of all welding consumables used to fabricate WP91 fittings shall not exceed 1.0 %.6.3.2 All welds inWP92 andWP911 shall be made using welding consumables meeting the chemical requir
28、ements for the gradein Table 1.5 Available from Manufacturers Standardization Society of the Valve and Fittings Industry (MSS), 127 Park St., NE, Vienna, VA 22180-4602, http:/www.mss-.6 Available from American Society for Nondestructive Testing (ASNT), P.O. Box 28518, 1711 Arlingate Ln., Columbus, O
29、H 43228-0518, http:/www.asnt.org.7 Available from American Welding Society (AWS), 550 NW LeJeune Rd., Miami, FL 33126, http:/www.aws.org.A234/A234M 1526.4 Personnel performing NDE examinations shall be qualified in accordance with SNT-TC-1A.6.5 The welded joints of the fittings shall be finished in
30、accordance with the requirements of Paragraph UW-35 (a) of ASMESection VIII, Division 1.6.6 All butt-weld tees manufactured by cold-forming method(s) shall be liquid penetrant or magnetic particle examined by oneof the methods specified in Supplementary Requirement S52 or S53 in Specification A960/A
31、960M. This examination shall beperformed after final heat treat. Only the side wall area of the tees need be examined. This area is defined by a circle that coversthe area from the weld bevel of the branch outlet to the center line of the body or run. Internal and external surfaces shall beexamined
32、when size permits accessibility. No cracks shall be permitted. Other imperfections shall be treated in accordance withSection 14 on Surface Quality. After the removal of any crack, the tee(s) shall be re-examined by the original method. Acceptabletees shall be marked with the symbol PT or MT, as app
33、licable, to indicate compliance.6.7 Stubends may be produced with the entire lap added by the welding of a ring, made from plate or bar of the same alloy gradeand composition, to the outside of a straight section of pipe, provided the weld is double welded, is a full penetration joint, satisfiesthe
34、requirements of 6.3 for qualifications and 7.3.4 for post weld heat treatment.TABLE 1 Chemical RequirementsNOTE 1All requirements are maximum unless otherwise indicated.NOTE 2Where an ellipsis (.) appears in this table, there is no requirement and analysis for the element need not be determined or r
35、eported.Grade andMarkingSymbolAComposition, %Carbon Manganese Phospho-rus Sulfur Silicon Chromium Molybdenum Nickel Copper OthersWPBB,C,D,E, 0.30 0.291.06 0.050 0.058 0.10 min 0.40 0.15 max 0.40 0.40 Vanadium 0.08WPCC,D,E, 0.35 0.291.06 0.050 0.058 0.10 min 0.40 0.15 max 0.40 0.40 Vanadium 0.08WP1 0
36、.28 0.300.90 0.045 0.045 0.100.50 . . . 0.440.65 . . . . . . . . .WP12 CL1, 0.050.20 0.300.80 0.045 0.045 0.60 0.801.25 0.440.65 . . . . . . . . .WP12 CL2 . . .WP11 CL1 0.050.15 0.300.60 0.030 0.030 0.501.00 1.001.50 0.440.65 . . . . . . . . .WP11 CL2, 0.050.20 0.300.80 0.040 0.040 0.501.00 1.001.50
37、 0.440.65 . . . . . . . . .WP11 CL3 . . .WP22 CL1, 0.050.15 0.300.60 0.040 0.040 0.50 1.902.60 0.871.13 . . . . . . . . .WP22 CL3 . . .WP24 0.050.10 0.300.70 0.020 0.010 0.150.45 2.202.60 0.901.10 . . . 0.751.25 Aluminum 0.020Boron 0.00150.0070Nitrogen 0.12Titanium 0.060.10Vanadium 0.200.30WP5 CL1,
38、0.15 0.300.60 0.040 0.030 0.50 4.06.0 0.440.65 . . . . . . . . .WP5 CL3 . . .WP9 CL1,WP9 CL30.15 0.300.60 0.030 0.030 1.00 8.010.0 0.901.10 . . . . . . . . .WPR 0.20 0.401.06 0.045 0.050 . . . . . . . . . 1.602.24 0.751.25 . . .WP91 0.080.12 0.300.60 0.020 0.010 0.200.50 8.09.5 0.851.05 0.40 . . . V
39、anadium 0.180.25Columbium 0.060.10Nitrogen 0.030.07Aluminum 0.02FTitanium 0.01FZirconium 0.01FWP911 0.090.13 0.300.60 0.020 0.010 0.100.50 8.59.5 0.901.10 0.40 . . . Vanadium 0.180.25Columbium 0.0600.10Nitrogen 0.040.09Aluminum 0.02 maxFBoron 0.00030.006Tungsten 0.901.10Titanium 0.01 maxFZirconium 0
40、.01 maxFWP92 0.070.13 0.300.60 0.020 0.010 0.50 8.509.50 0.300.60 0.40 . . . Aluminum 0.02FBoron 0.0010.006Columbium 0.040.09Nitrogen 0.0300.070Titanium 0.01FTungsten 1.502.00Vanadium 0.150.25Zirconium 0.01FA When fittings are of welded construction, the grade and marking symbol shown above shall be
41、 supplemented by letter “W”.B Fittings made from bar or plate may have 0.35 max carbon.C Fittings made from forgings may have 0.35 max carbon and 0.35 max silicon with no minimum.D For each reduction of 0.01 % below the specified carbon maximum, an increase of 0.06 % manganese above the specified ma
42、ximum will be permitted, up to a maximumof 1.65 %.E The sum of Copper, Nickel, Chromium, and Molybdenum shall not exceed 1.00 %.FApplies both to heat and product analyses.A234/A234M 153TABLE 2 Tensile RequirementsNOTE 1Where an ellipsis (.) appears in this table, there is no requirement.Grade and Ma
43、rking Symbol WPBWPC,WP11 CL2,WP12 CL2 WP1WP11 CL1,WP22 CL1,WP5 CL1WP9 CL1WPRWP11 CL3,WP22 CL3WP5 CL3WP9 CL3WP24 WP91 WP92WP911 WP12 CL1Tensile strength, minimum unlessa range is given ksi MPa60 415 70 485 558038055060 415 638843560575 520 85 585 90 620 9012062084060 415Yield strength, min, ksi MPa(0
44、.2 % offset or 0.5 %extension-under-load)35 240 40 275 30 205 30 205 46 315 45 310 60 415 60 415 64 440 32 220Elongation RequirementsGradesAll Grades except WPR,WP91, and WP911 WPR and WP24WP91WP92WP911Longi-tudinalTrans-verseLongi-tudinalTrans-verseLongi-tudinalTrans-verseElongation:Standard round
45、specimen, or small proportional specimen, min % in 4 D 22 14 20 . . . 20 13Rectangular specimen for wall thickness 516 in. 7.94 mm and over,and for all small sizes tested in full section; min % in 2 in. 50 mm30 20A 28 . . . . . . . . .Rectangular specimen for wall thickness less than 516 in. 7.94 mm
46、;min % in 2 in. 50 mm (12-in. 12.7-mm wide specimen)B B B . . . . . . . . .A WPB and WPC fittings manufactured from plate shall have a minimum elongation of 17 %.B For each 132 in. 0.79 mm decrease in wall thickness below 516 in. 7.94 mm, a deduction of 1.5 % for longitudinal and 1.0 % for transvers
47、e from the values shown above is permitted. The following table gives theminimum value for various wall thicknesses.Wall ThicknessGradesAll Grades except WPR, WP91 and WP911 WPR WP91, WP92, andWP911in. mm Longitudinal Transverse Longitudinal Longitudinal516 (0.312) 7.94 30.0 20.0 28.0 20932 (0.281)
48、7.14 28.5 19.0 26.5 1914 (0.250) 6.35 27.0 18.0 25.0 18732 (0.219) 5.56 25.5 . . . 23.5 17316 (0.188) 4.76 24.0 . . . 22.0 16532 (0.156) 3.97 22.5 . . . 20.5 1518 (0.125) 3.17 21.0 . . . 19.0 14332 (0.094) 2.38 19.5 . . . 17.5 13116 (0.062) 1.59 18.0 . . . 16.0 12NoteThis table gives the computed mi
49、nimum % elongation value for each 132 in. 0.79 mm decrease in wall thickness. Where the wall thickness lies between two values above, the minimum elongation value isdetermined by the following equations:Direction of Test EquationLongitudinal E = 48t + 15.00Transverse E = 32t + 10.00where:E = elongation in 2 in. or 50 mm, %, andt = actual thickness of specimen, in. mm.A234/A234M1547. Heat Treatment7.1 Heat Trea
