1、Designation: A858/A858M 10aStandard Specification forHeat-Treated Carbon Steel Fittings for Low-Temperature andCorrosive Service1This standard is issued under the fixed designation A858/A858M; the number immediately following the designation indicates the yearof original adoption or, in the case of
2、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 heat-treated wrought carbonsteel piping fittings with lowered carbon
3、content of seamlessand electric fusion-welded construction covered by the latestrevisions in ASME B16.9, ASME B16.11, MSS SP-75, MSSSP-79, MSS SP-83, MSS SP-95,orMSS SP-97. Fittingsdiffering from these ASME and MSS standards shall befurnished in accordance with Supplementary Requirement S58of Specif
4、ication A960/A960M. These fittings are for use inpressure components where inherent notch toughness andoptimum sulfide-cracking resistance are required, such as oiland gas industry piping and distribution systems.1.2 Optional supplementary requirements are provided forfittings when a greater degree
5、of examination is desired. One ormore of the supplementary requirements may be specified inthe order.1.3 This specification does not cover cast-welding fittings orfittings machined from castings.1.4 The values stated in either SI units or inch-pound unitsare to be regarded separately as standard. Wi
6、thin the text, theSI units are shown in brackets. The values stated in eachsystem may not be exact equivalents; therefore, each systemshall be used independently of the other. Combining valuesfrom the two systems may result in non-conformance with thestandard. Unless the other specifies the applicab
7、le “M” speci-fication designation (SI units), the material shall be furnishedto inch-pound units.2. Referenced Documents2.1 In addition to those reference documents listed inSpecification A960/A960M, the following list of standardsapply to this specification.2.2 ASTM Standards:2A960/A960M Specificat
8、ion for Common Requirements forWrought Steel Piping Fittings2.3 ASME Standards:3B16.9 Steel Butt-Welding FittingsB16.11 Forged Steel Fittings, Socket Welding and Threaded2.4 MSS Standards:4MSS SP-25 The Standard Marking System of Valves,Fittings, Flanges and UnionsMSS SP-75 Specification for High Te
9、st Wrought Butt-Welding FittingsMSS SP-79 Socket Welding Reducer InsertsMSS SP-83 Steel Pipe Unions, Socket-Welding andThreadedMSS SP-95 Swage(d) Nipples and Bull PlugsMSS SP-97 Integrally Reinforced Forged Branch OutletFittingsSocket Welding, Threaded and ButtweldingEnds2.5 ASME Boiler and Pressure
10、 Vessel Code:Section V Nondestructive Examination5Section VIII Division 1, Pressure Vessels5Section IX Welding and Brazing Qualifications2.6 American Society of Nondestructive Testing:6SNT-TC-1A Recommended Practice for NondestructiveTesting Personnel Qualification and Certification3. Ordering Infor
11、mation3.1 In addition to the requirements of Specification A960/A960M, the following ordering information applies: require-ments for certification of the test report.4. General Requirements4.1 Products furnished to this specification shall conform tothe requirements of Specification A960/A960M, incl
12、uding anysupplementary requirements that are indicated in the purchase1This specification is under the jurisdiction of ASTM Committee A01 on Steel,Stainless Steel and Related Alloys and is the direct responsibility of SubcommitteeA01.22 on Steel Forgings and Wrought Fittings for PipingApplications a
13、nd BoltingMaterials for Piping and Special Purpose Applications.Current edition approved Nov. 1, 2010. Published December 2010. Originallyapproved in 1986. Last previous edition approved in 2010 as A858/A858M10.DOI: 10.1520/A0858_A0858M-10a.2For referenced ASTM standards, visit the ASTM website, www
14、.astm.org, orcontact ASTM Customer Service at serviceastm.org. For Annual Book of ASTMStandards volume information, refer to the standards Document Summary page onthe ASTM website.3Available from American Society of Mechanical Engineers (ASME), ASMEInternational Headquarters, Three Park Ave., New Yo
15、rk, NY 10016-5990, http:/www.asme.org.4Available from Manufacturers Standardization Society of the Valve and FittingsIndustry (MSS), 127 Park St., NE, Vienna, VA 22180-4602, http:/www.mss-.5Available from Society of Automotive Engineers (SAE), 400 CommonwealthDr., Warrendale, PA 15096-0001, http:/ww
16、w.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, West Consho
17、hocken, PA 19428-2959, United States.order. Failure to comply with the general requirements ofSpecification A960/A960M constitutes nonconformance withthis specification. In case of conflict between the requirementsof this specification and Specification A960/A960M, thisspecification shall prevail.5.
18、 Materials5.1 The material for fittings shall be fully killed fine-grainmaterial made by a melting process that is intended to producerounded, well dispersed, fine sulfide inclusions, that promotegood notch toughness, assists in the resistance to hydrogeninduced cracking, and for weldability suitabl
19、e for field-welding.5.2 Starting materials shall consist of plate, sheet, forgings,forging quality bar and seamless or fusion welded tubularproducts with filler metal added. The chemical compositionshall conform to Table 1.5.3 Astarting material that specifically requires the additionof any element
20、beyond those listed in Table 1 is not permitted.This does not preclude the use of deoxidizers.5.4 Starting materials shall not require a preheat for fieldwelding provided that the restrictions of ASME Boiler andPressure Vessel Code, Section VIII, Paragraph UW-30 arecomplied with.6. Manufacture6.1 Fo
21、rging or shaping operations may be performed byhammering, pressing, piercing, extruding, upsetting, rolling,bending, fusion welding, machining, or by a combination ofthese operations.6.2 All welds including welds in tubular products fromwhich the fittings are made shall be:6.2.1 Made by welders, wel
22、ding operators, and weldingprocedures qualified under the provisions of ASME Boiler andPressure Vessel Code, Section IX,6.2.2 Heat treated in accordance with Section 7 of thisspecification, and6.2.3 Radiographically examined throughout the entirelength of each weld in accordance with Articles 1 and
23、2 ofASME Boiler and Pressure Vessel Code, Section V with theacceptance limits in accordance with Paragraph UW-51 inSection VIII of that same code.6.3 The welded joints of the fittings shall be furnished inaccordance with the requirements of Paragraph UW-35(a) ofASME Boiler and Pressure Vessel Code,
24、Section VIII.6.4 All butt-weld tees manufactured by cold-forming meth-ods shall be liquid-penetrant or magnetic-particle examined byone of the methods specified in Specification A960/A960M.This examination shall be performed in accordance with awritten procedure and shall be performed after final he
25、attreatment. Only the side wall area of the tees need beexamined. This area is defined by a circle that covers the areafrom the weld bevel of the branch outlet to the center line of thebody or run. Internal and external surfaces shall be examinedwhen size permits accessibility. No cracks shall be pe
26、rmitted.Other imperfections shall be treated in accordance with Section14 on finish. After the removal of any crack, the tees shall bere-examined by the original method. Acceptable tees shall bemarked with the symbol PT or MT, as applicable, to indicatecompliance. NDE personnel shall be qualified in
27、 accordancewith SNT-TC-1A.6.5 All caps machined from bar stock shall be examined byliquid penetrant or magnetic particle in accordance withSupplementary Requirement S69 or S70 with personnel quali-fications, acceptance criteria and marking as in 5.4.7. Heat Treatment7.1 All fittings shall be furnish
28、ed in the heat-treated condi-tion. Fittings formed above the transformation temperature orupon which welding is performed, shall be cooled to below thelower criteria temperature prior to heat treatment. Fittings shallsubsequently be heat treated by normalizing, quenching, andtempering or stress-reli
29、eving in accordance with SpecificationA960/A960M.8. Chemical Composition Requirements8.1 The chemical composition of the steel shall conform tothe requirements prescribed in Table 1.8.2 The steel shall not contain any unspecified elements forthe ordered grade to the extent that it conforms to thereq
30、uirements of another grade for which that element is aspecified element having a required minimum content.8.3 An analysis of each heat of steel shall be made from asample taken preferably during the pouring of the heat. Theresults shall conform to Table 1.8.4 The fittings manufacturer shall make a p
31、roduct analysisper heat from either the starting material or from a fitting inaccordance with Specification A960/A960M.8.5 Weld metal used in the construction of the fittings shallconform to the tensile and impact requirements of 9.4 and 11.1after heat treatment in accordance with Section 7. A chemi
32、calanalysis shall be performed on deposited weld metal for eachheat of filler metal or, for submerged arc welding, each heat offiller metal and batch of flux. The weld metal shall be depositedin accordance with the qualified weld procedure.8.6 Only the carbon content of the deposited weld-metalcompo
33、sition need comply with the requirements of Table 1.The total nickel content of the deposited weld metal shall notexceed 1.0 %.TABLE 1 Chemical RequirementsComposition %Heat AnalysisCarbon 0.20Manganese 0.901.35 All values arePhosphorus 0.030 maximum unless aSulfur 0.010 range is shownSilicon 0.150.
34、40ANickel 0.50BChromium 0.30BMolybdenum 0.20BCopper 0.35BAWhen vacuum carbon deoxidation is used, the silicon shall be 0.10 %maximum, and on product analysis shall not exceed 0.12 %.BThe combined total of nickel, chromium, molybdenum, and copper shall notexceed 1.0 %.A858/A858M 10a29. Tensile Requir
35、ements Tensile Requirements9.1 The tensile properties of the fitting material shall con-form to the requirements listed in Table 2.9.2 Tension test specimens shall be taken from a fitting afterfinal heat treatment or from a test piece of the same heat andnominal thickness that was heat-treated in a
36、charge with thefittings it represents.9.3 One tensile test is required for each heat of fittings of thesame section thickness and heat treated in either a continuous-or batch-type furnace, controlled within a range of 50 F 28C and equipped with recording pyrometers.9.4 In addition, fittings containi
37、ng welds shall have onecenter-weld tension test made with the axis transverse to theweld seam for each heat of filler metal, or each heat of fillermetal and batch of flux for submerged arc welds, for fittings ofthe same section thickness and heat treated in either a continu-ous or batch-type furnace
38、 controlled within a range of 50 F28 C and equipped with recording pyrometers. Only theultimate tensile strength need meet the minimum requirementsof Table 2.10. Hardness Requirements10.1 Fittings shall have a maximum hardness of 22 HRC(235 HBW).11. Notch Toughness Properties11.1 The notch toughness
39、 properties of the fittings shallconform to the requirements listed in Table 2. The testing shallbe performed as specified in Specification A960/A960M.Full-size Charpy, V-notch, Type A specimens shall be usedwhenever possible. Small size specimens shall be used onlywhen the material thickness does n
40、ot permit full size speci-mens. The impact specimens shall not be flattened after heattreatment. All base metal specimens shall be removed with theaxis of the specimens longitudinal to the direction of primarymetal flow. Weld metal specimens shall have the axis trans-verse to the weld seam.11.2 One
41、set of impact tests (three specimens) shall be madeto represent the base metal and one set of impact tests (threespecimens) shall be made to represent the weld metal on thesame frequency as the tension tests.11.3 The test temperature shall be 50 F 46 C.12. Dimensions12.1 Dimensional requirements for
42、 NPS 14 and smallerfittings are provided by ASME B16.9, B16.11, MSS SP-79,MSS SP-83, MSS SP-95,orMSS SP-97.12.2 Dimensional requirements for fittings larger than NPS14 up through NPS 48 are provided in MSS SP-75, except asmodified by 12.312.3 Fittings of a size or shape differing from the standardsi
43、n 12.1 and 12.2 but meeting all the other requirements of thisspecification, may be furnished in accordance with Supplemen-tary Requirement S58 of Specification A960/A960M.13. Finish and Appearance13.1 See Specification A960/A960M for specific require-ments.14. Repair by Welding (Base Metal)14.1 Rep
44、air welding, by the manufacturer, is permissible inaccordance with Specification A960/A960M and the follow-ing:14.1.1 The deposited weld metal shall conform to therequirements of 8.5 and 8.6. Electrodes for the shieldedmetal-arc process shall be of the low-hydrogen type.14.1.2 Sections thicker than
45、1 in. 25 mm shall also beradiographed after repair welding in accordance with 6.2.14.1.3 All fittings repaired by welding shall be thermallytreated after repair by either complete reheat treatment orpost-weld heat treatment at least 50 F 28 C below thetempering temperature if tempering has been perf
46、ormed.14.1.4 Indications discovered by nondestructive examina-tion shall, after heat treatment, be again examined by the sameNDE method as used in the original determination.14.1.5 Personnel performing NDE examinations shall bequalified in accordance with SNT-TC-1A.15. Hydrostatic Test15.1 Hydrostat
47、ic testing is not required by this specification.15.2 Every fitting shall be capable of withstanding withoutfailure, leakage, or impairment of serviceability, a hydrostatictest pressure of 112 times its pressure rating or 112 times thepiping design pressure.16. Rejection and Rehearing16.1 Material t
48、hat fails to conform to the requirements ofthis specification may be rejected. Rejection shall be reportedTABLE 2 Mechanical RequirementsYield strength, min, 0.2 % offset, ksi MPa 36 250Tensile strength, min, ksi MPa 70 485-95 655Elongation:Standard round specimen, or small-sizeproportional specimen
49、, min, % in 4D22Rectangular specimen, for section thickness516 in. 7.94 mm and over, and for smallsizes tested in full section; min, % in 2 in.50 mm.30Rectangular specimen for section thicknessless than516 in. 7.94 mm; min, % in2 in. 50 mm.Width of specimen 112 in. 40 mm.AReduction of area (round specimen only);min, %.40Toughness:Cvenergy absorptionB; measured at 50 F46 C:Specimen size, mm Average/min,ftlbs J10 3 10 20/16 27/2210 3 7.5 17/13 23/1810 3 5 13/11 18/15AFor each132 in. 0.79 mm decrease in section
