1、Designation:B46810(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 number in
2、 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 high-temperatur
3、e service.1.2 This specification covers tubes18to 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 dimensions may be furnished pro
4、videdsuch 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 considered standard.1.4 This st
5、andard 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 as providedby the manufactu
6、rer,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 SteelsB751 Specification for General Re
7、quirements 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.General Requirements4.1 Material fur
8、nished 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 are necessary for material ordered
9、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),5.1.5 ASTM designation,5.1.6 Product Analysi
10、sState 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 Manufacture6.1 The tubing shall be made from flat-ro
11、lled 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 of UNS N08020 alloy shall befurnished in the st
12、abilized-annealed condition.NOTE1The 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 as definedin Specification B751.1This specificati
13、on 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.Originallyapproved in 1968.Last previous edition approved in
14、 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 Customer Service at serviceastm.org.For Annual Book of ASTMSt
15、andards 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 States1 7.2 If a product analysis is performed,it shall meet thechemistry limits prescribed in Table 1,subj
16、ect 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.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 sh
