1、Designation: B468 10 (Reapproved 2016)Standard Specification forWelded UNS N08020 Alloy Tubes1This standard is issued under the fixed designation B468; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the year of last revision. A nu
2、mber in parentheses indicates the year of last reapproval. Asuperscript epsilon () indicates an editorial change since the last revision or reapproval.1. Scope1.1 This specification2covers welded UNS N08020 alloyboiler, heat exchanger, and condenser tubes for generalcorrosion-resisting and low- or h
3、igh-temperature service.1.2 This specification covers tubes18 to 5 in. (3.18 to 127mm), inclusive, in outside diameter and 0.015 to 0.500 in. (0.38to 12.70 mm), inclusive, in wall thickness. Table 2 of Specifi-cation B751 lists the dimensional requirements of these sizes.Tubes having other dimension
4、s may be furnished providedsuch tubing complies with all other requirements of thisspecification.1.3 The values stated in inch-pound units are to be regardedas standard. The values given in parentheses are mathematicalconversions to SI units that are provided for information onlyand are not consider
5、ed standard.1.4 This standard does not purport to address all of thesafety concerns, if any, associated with its use. It is theresponsibility of the user of this standard to become familiarwith all hazards including those identified in the appropriateSafety Data Sheet (SDS) for this product/material
6、 as providedby the manufacturer, to establish appropriate safety and healthpractices, and determine the applicability of regulatory limi-tations prior to use.2. Referenced Documents2.1 ASTM Standards:3A262 Practices for Detecting Susceptibility to IntergranularAttack in Austenitic Stainless SteelsB7
7、51 Specification for General Requirements for Nickel andNickel Alloy Welded TubeB899 Terminology Relating to Non-ferrous Metals and Al-loys3. Terminology3.1 DefinitionsDefinitions for terms defined in Terminol-ogy B899 shall apply unless otherwise defined by the require-ments of this document.4. Gen
8、eral Requirements4.1 Material furnished in accordance with this specificationshall conform to the applicable requirements of the currentedition of Specification B751 unless otherwise providedherein.5. Ordering Information5.1 It is the responsibility of the purchaser to specify allrequirements that a
9、re necessary for material ordered under thisspecification. Examples of such requirements include, but arenot limited to, the following:5.1.1 Quantity (feet or number of lengths),5.1.2 UNS number,5.1.3 Size (outside diameter and minimum or average wallthickness),5.1.4 Length (random or specific),5.1.
10、5 ASTM designation,5.1.6 Product AnalysisState if required,5.1.7 CertificationState if a certification or a report of testresults is required,5.1.8 Purchaser InspectionState which tests or inspec-tions are to be witnessed, if any, and5.1.9 Supplementary requirements, if any.6. Materials and Manufact
11、ure6.1 The tubing shall be made from flat-rolled stock by anautomatic welding process with no addition of filler metal.Subsequent to welding and prior to final heat treatment, thematerial shall be cold-worked in either the weld metal only, orin both the weld and base metal.6.2 Heat TreatmentTubing o
12、f UNS N08020 alloy shall befurnished in the stabilized-annealed condition.NOTE 1The recommended annealing temperatures are 1800 to 1850F(982 to 1010C) for UNS N08020.7. Chemical Composition7.1 The material shall conform to the composition limitsspecified in Table 1. One test is required for each lot
13、 as definedin Specification B751.1This specification is under the jurisdiction of ASTM Committee B02 onNonferrous Metals and Alloys and is the direct responsibility of SubcommitteeB02.07 on Refined Nickel and Cobalt and Their Alloys.Current edition approved June 1, 2016. Published June 2016. Origina
14、llyapproved in 1968. Last previous edition approved in 2010 as B468 10. DOI:10.1520/B0468-10R16.2For ASME Boiler and Pressure Vessel Code applications, see related Specifi-cation SB-468 in Section II of that code.3For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Cu
15、stomer Service at serviceastm.org. For Annual Book of ASTMStandards volume information, refer to the standards Document Summary page onthe ASTM website.Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States17.2 If a product analysis is perfo
16、rmed, it shall meet thechemistry limits prescribed in Table 1, subject to the analysistolerances specified in Table 6 of Specification B751.8. Mechanical Properties and Other Requirements8.1 Mechanical PropertiesThe material shall conform tothe mechanical property requirements specified in Table 2.
17、Onetest is required for each lot as defined in Specification B751.8.2 Flattening TestA flattening test shall be made on eachend of one tube per lot. Superficial ruptures resulting fromsurface imperfections shall not be cause for rejection.8.3 Flange TestA flange test shall be made on each end ofone
18、tube per lot.8.4 Nondestructive Test RequirementsEach tube shall besubjected to either a pressure test or a nondestructive electrictest at the manufacturers option. The purchaser may specifywhich test is to be used.9. Keywords9.1 welded tube; N08020SUPPLEMENTARY REQUIREMENTSThe following supplementa
19、ry requirements shall be applied only when specified by the purchaserin the inquiry, contract, or order:S1. Corrosion TestsS1.1 One intergranular corrosion test per lot shall be per-formed by the manufacturer on a sensitized specimen andtested in accordance with Practices A262. When this supple-ment
20、ary requirement is specified, the specific practice (PracticeB or Practice E) shall also be specified. If Practice B isspecified, the specimen must pass with a rate of less than 0.002in. (0.05 mm) per month. A lot for intergranular corrosiontesting shall be the same as for mechanical testing.S1.1.1
21、In addition to the anneal recommended in Note 1, thespecimen shall be sensitized for1hat1250F (677C) beforebeing subjected to corrosion testing.S1.1.2 If any corrosion test specimen fails the test, thematerial represented by such specimens may be reheat-treatedand resubmitted for test.ASTM Internati
22、onal takes no position respecting the validity of any patent rights asserted in connection with any item mentionedin this standard. Users of this standard are expressly advised that determination of the validity of any such patent rights, and the riskof infringement of such rights, are entirely thei
23、r own responsibility.This standard is subject to revision at any time by the responsible technical committee and must be reviewed every five years andif not revised, either reapproved or withdrawn. Your comments are invited either for revision of this standard or for additional standardsand should b
24、e addressed to ASTM International Headquarters. Your comments will receive careful consideration at a meeting of theresponsible technical committee, which you may attend. If you feel that your comments have not received a fair hearing you shouldmake your views known to the ASTM Committee on Standard
25、s, at the address shown below.This standard is copyrighted by ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959,United States. Individual reprints (single or multiple copies) of this standard may be obtained by contacting ASTM at the aboveaddress or at 610-832-
26、9585 (phone), 610-832-9555 (fax), or serviceastm.org (e-mail); or through the ASTM website(www.astm.org). Permission rights to photocopy the standard may also be secured from the Copyright Clearance Center, 222Rosewood Drive, Danvers, MA 01923, Tel: (978) 646-2600; http:/ 1 Chemical RequirementsElem
27、entComposition,%UNS N08020Carbon, max 0.07Manganese, max 2.00Phosphorus,max0.045Sulfur, max 0.035Silicon, max 1.00Nickel 32.0038.00Chromium 19.0021.00Molybdenum 2.003.00Copper 3.004.00Columbium(Nb) +8 carbon1.00tantalumNitrogen .IronAremainderABy difference.TABLE 2 Mechanical Property RequirementsTensile Strength,min, ksi (MPa)Yield Strength,min, ksi (MPa)Elongation in 2 in.(50.8 mm), min, %80 (551) 35 (241) 30.0B468 10 (2016)2
