1、Designation: A858/A858M 10Standard 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 r
2、evision, 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 c
3、ontent 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 Specifi
4、cation 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 o
5、f 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. Wit
6、hin 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 applicabl
7、e “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:2A370 Test Methods and
8、Definitions for Mechanical Testingof Steel ProductsA960/A960M Specification 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 o
9、f Valves,Fittings, Flanges and UnionsMSS SP-75 Specification for High Test 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 OutletFittings
10、Socket Welding, Threaded and ButtweldingEnds2.5 ASME Boiler and Pressure 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 Nondestr
11、uctiveTesting Personnel Qualification and Certification1This 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 and BoltingMater
12、ials for Piping and Special Purpose Applications.Current edition approved May 1, 2010. Published June 2010. Originallyapproved in 1986. Last previous edition approved in 2009 as A858/A858M09.DOI: 10.1520/A0858_A0858M-10.2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact
13、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 York, NY 10016-5990, ht
14、tp:/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:/www.sae.org.6Available
15、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 Conshohocken, PA 19428-2959
16、, United States.3. Ordering Information3.1 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
17、of Specification A960/A960M, including anysupplementary requirements that are indicated in the purchaseorder. Failure to comply with the general requirements ofSpecification A960/A960M constitutes nonconformance withthis specification. In case of conflict between the requirementsof this specificatio
18、n and Specification A960/A960M, thisspecification shall prevail.5. 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 r
19、esistance to hydrogeninduced cracking, and for weldability suitable 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 Astarti
20、ng material that specifically requires the additionof any element 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, S
21、ection VIII, Paragraph UW-30 arecomplied with.6. Manufacture6.1 Forging 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 f
22、romwhich the fittings are made shall be:6.2.1 Made by welders, welding 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 throughou
23、t the entirelength of each weld in accordance with Articles 1 and 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 requireme
24、nts of Paragraph UW-35(a) ofASME Boiler and Pressure Vessel Code, 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 accord
25、ance with awritten procedure and shall be performed after final heattreatment. 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
26、 be examinedwhen size permits accessibility. No cracks shall be permitted.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 appl
27、icable, to indicatecompliance. NDE personnel shall be qualified in 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 ma
28、rking as in 5.4.7. Heat Treatment7.1 All fittings shall be furnished 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 h
29、eat treated by normalizing, quenching, andtempering or stress-relieving 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 elem
30、ents forthe ordered grade to the extent that it conforms to therequirements 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 sha
31、ll conform to Table 1.8.4 The fittings manufacturer shall make a product 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
32、and 11.1after heat treatment in accordance with Section 7. A chemicalanalysis shall be performed on deposited weld metal for eachheat of filler metal or, for submerged arc welding, each heat ofTABLE 1 Chemical RequirementsComposition %Heat AnalysisCarbon 0.20Manganese 0.901.35 All values arePhosphor
33、us 0.030 maximum unless aSulfur 0.010 range is shownSilicon 0.150.40ANickel 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,
34、 and copper shall notexceed 1.0 %.A858/A858M 102filler 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-metalcomposition need comply with the requirements of Table 1.The total nickel content of
35、 the deposited weld metal shall notexceed 1.0 %.9. Tensile Requirements 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
36、of the same heat andnominal thickness that was heat-treated in a 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 equi
37、pped with recording pyrometers.9.4 In addition, fittings containing 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 thickne
38、ss and heat treated in either a continu-ous or batch-type furnace 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 HR
39、C(235 HB).11. Notch Toughness Properties11.1 The notch toughness properties of the fittings shallconform to the requirements listed in Table 2. The testing shallbe performed in accordance with Methods and DefinitionsA370. Full-size Charpy, V-notch, Type A specimens shall beused whenever possible. Sm
40、all size specimens shall be usedonly when the material thickness does not permit full sizespecimens. The impact specimens shall not be flattened afterheat treatment.All base metal specimens shall be removed withthe axis of the specimens longitudinal to the direction ofprimary metal flow. Weld metal
41、specimens shall have the axistransverse to the weld seam.11.2 One 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
42、shall be 50 F 46 C.12. Dimensions12.1 Dimensional requirements for 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
43、12.312.3 Fittings of a size or shape differing from the standardsin 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
44、 specific require-ments.14. Repair by Welding (Base Metal)14.1 Repair 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 proce
45、ss shall be of the low-hydrogen type.14.1.2 Sections thicker than 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 5
46、0 F 28 C below thetempering temperature if tempering has been performed.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 bequalifi
47、ed in accordance with SNT-TC-1A.15. Hydrostatic Test15.1 Hydrostatic testing is not required by this specification.TABLE 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
48、 specimen, 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
49、(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 thickness below516 in. 7.94mm a deduction 1.5 % from the 30 % shown above is permitted. Where thesection thickness lies between two values defined above, the minimum elongationvalue is determined by the following equation:E =48t + 15.00where:E = elongation in 2 in. 50 mm, andt = actual t
