1、Designation: A 858/A 858M 07Standard Specification forHeat-Treated Carbon Steel Fittings for Low-Temperature andCorrosive Service1This standard is issued under the fixed designationA 858/A 858M; the number immediately following the designation indicates the yearof original adoption or, in the case o
2、f revision, the year of last revision. A number in parentheses indicates the year of last reapproval.A superscript epsilon (e) 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 carb
3、on content of seamlessand electric fusion-welded construction covered by the latestrevisions in ASME B16.9, ASME B16.11, ASME B16.28,MSS-SP-75, MSS-SP-79, MSS-SP-83,orMSS-SP-95. Fittingsdiffering from these ASME and MSS standards shall befurnished in accordance with Supplementary Requirement S58of S
4、pecification A 960/A 960M. 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
5、degree 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 inch-pound units or SI unitsare to be regarded separately as stand
6、ard. Within the text, theSI units are shown in brackets. Combining values from the twosystems may result in nonconformance with this specification.The values stated in each system are not exact equivalents;therefore, each system must be used independently of the other.Unless the other specifies the
7、applicable “M” specificationdesignation (SI units), the material shall be furnished toinch-pound units.2. Referenced Documents2.1 In addition to those reference documents listed inSpecification A 960/A 960M, the following list of standardsapply to this specification.2.2 ASTM Standards:2A 370 Test Me
8、thods and Definitions for Mechanical Testingof Steel ProductsA 960/A 960M Specification for Common Requirementsfor Wrought Steel Piping Fittings2.3 ASME Standards:3B16.9 Steel Butt-Welding FittingsB16.11 Forged Steel Fittings, Socket Welding and ThreadedB16.28 Wrought Steel Buttwelding Short Radius
9、Elbowsand Returns2.4 MSS Standards:4MSS-SP-25 The Standard Marking System of 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
10、 and Bull Plugs2.5 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 NondestructiveTesting Personnel Quali
11、fication and Certification3. Ordering Information3.1 In addition to the requirements of Specification A 960/A 960M, 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 r
12、equirements of Specification A 960/A 960M, includingany supplementary requirements that are indicated in the1This 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 Wro
13、ught Fittings for PipingApplications and BoltingMaterials for Piping and Special Purpose Applications.Current edition approved March 1, 2007. Published April 2007. Originallyapproved in 1986. Last previous edition approved in 2006 as A 858/A 858M 06.2For referenced ASTM standards, visit the ASTM web
14、site, www.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
15、., New York, NY 10016-5990.4Available from Manufacturers Standardization Society of the Valve and FittingsIndustry, 1815 N. Fort Myer Drive, Arlington, VA 22209.5Available from Society of Automotive Engineers (SAE), 400 CommonwealthDr., Warrendale, PA 15096-0001.6Available from TheAmerican Society f
16、or Nondestructive Testing (ASNT), P.O.Box 28518, 1711 Arlingate Ln., Columbus, OH 43228-0518.1*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, United States.purchase order. Failure to
17、 comply with the general require-ments of Specification A 960/A 960M constitutes nonconfor-mance with this specification. In case of conflict between therequirements of this specification and Specification A 960/A 960M, this specification shall prevail.5. Materials5.1 The material for fittings shall
18、 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 suitable for field-welding.5.2 Starting materials sh
19、all 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 beyond those listed in Table 1 is not permitt
20、ed.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 Forging or shaping operations may be performed
21、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, welding operators, and weldingprocedures qualifi
22、ed 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 2 ofASME Boiler and Pressure Vessel Code, Sec
23、tion 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, Section VIII.6.4 All butt-weld tees manufactu
24、red by cold-forming meth-ods shall be liquid-penetrant or magnetic-particle examined byone of the methods specified in Specification A 960/A 960M.This examination shall be performed in accordance with awritten procedure and shall be performed after final heattreatment. Only the side wall area of the
25、 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 permitted.Other imperfections shall be treate
26、d 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 accordancewith SNT-TC-1A.6.5 All caps mach
27、ined 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 furnished in the heat-treated condi-tion. Fittings
28、 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-relieving in accordance with SpecificationA 960
29、/A 960M.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 therequirements of another grade for which that
30、 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 product analysisper heat from either the s
31、tarting material or from a fitting inaccordance with Specification A 960/A 960M.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 chemicalanalysis shall be performed on depos
32、ited 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-metalcomposition need comply with the requirement
33、s 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 0.150.40ANickel 0.50BChromium 0.30BMolybdenum
34、 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 %.A 858/A 858M 0729. Tensile Requirements Tensile Requirements9.1 The ten
35、sile 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 charge with thefittings it represents.
36、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 containing welds shall have onecenter-weld ten
37、sion 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 controlled within a range of 50 F28 C
38、 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 HB).11. Notch Toughness Properties11.1 The notch toughness properties of the fittings shallconfor
39、m to the requirements listed in Table 2. The testing shallbe performed in accordance with Methods and DefinitionsA 370. Full-size Charpy, V-notch, Type A specimens shall beused whenever possible. Small size specimens shall be usedonly when the material thickness does not permit full sizespecimens. T
40、he 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 specimens shall have the axistransverse to the weld seam.11.2 One set of impact tests (three specimens
41、) 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 NPS 14 and smallerfittings are prov
42、ided by ASME B16.9, B16.11, B16.28, MSS-SP-79, MSS-SP-83,orMSS-SP-95.12.2 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 standardsin 12.1 and 12.2 but meeting all the ot
43、her requirements of thisspecification, may be furnished in accordance with Supplemen-tary Requirement S58 of Specification A 960/A 960M.13. Finish and Appearance13.1 See Specification A 960/A 960M for specific require-ments.14. Repair by Welding (Base Metal)14.1 Repair welding, by the manufacturer,
44、is permissible inaccordance with Specification A 960/A 960M 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 1 in. 25 mm shall also beradiogr
45、aphed 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 performed.14.1.4 Indications discove
46、red 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 Hydrostatic testing is not required by th
47、is 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 that fails to conform to the requ
48、irements 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, min, % in 4D22Rectangular spec
49、imen, 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 thickness below516 in. 7.94mm a deductio
