1、Designation: B 674 05Standard Specification forUNS N08925, UNS N08354, and UNS N08926 Welded Tube1This standard is issued under the fixed designation B 674; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the year of last revision.
2、 A number in parentheses indicates the year of last reapproval. Asuperscript epsilon (e) indicates an editorial change since the last revision or reapproval.1. Scope1.1 This specification covers UNS N08925,* UNS N08354,and UNS N08926 welded tube for general corrosion applica-tions.1.2 This specifica
3、tion covers outside diameter and nominalwall tube.1.2.1 The tube sizes covered by this specification are18 to 5in. (3.2 to 127 mm) in outside diameter and 0.015 to 0.320 in.(0.38 to 8.13 mm), inclusive, in wall thickness.1.3 ASTM International has adopted definitions wherebysome grades, such as UNS
4、N08904, previously in this speci-fication were recognized as stainless steels, because thosegrades have iron as the largest element by mass percent. Suchgrades are under the oversight of ASTM Committee A01 andits subcommittees. The products of N08904 previously coveredin this specification are now c
5、overed by Specification A 249/A 249M.1.4 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.1.5 This standard does not purport to address al
6、l 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 appropriateMaterial Safety Data Sheet for this product/material as pro-vided by the manufacturer, to establish appropria
7、te safety andhealth practices, and determine the applicability of regulatorylimitations prior to use.2. Referenced Documents2.1 ASTM Standards:2A 249/A 249M Specification for Welded Austenitic SteelBoiler, Superheater, Heat-Exchanger, and CondenserTubesB 751 Specification for General Requirements fo
8、r Nickeland Nickel Alloy Welded TubeE 527 Practice for Numbering Metals and Alloys (UNS)3. Ordering Information3.1 Orders for material to this specification should includethe following information:3.1.1 Quantity (feet or number of lengths),3.1.2 UNS number,3.1.3 Size (outsize diameter, minimum or av
9、erage wallthickness),3.1.4 Length (random or specific),3.1.5 Class, and3.1.6 ASTM designation.3.1.7 Product AnalysisState if required.3.1.8 CertificationState if a certification or a report of testresults is required.3.1.9 Purchaser InspectionState which tests or inspec-tions are to be witnessed, if
10、 any (see Tables 1 and 2).4. Materials and Manufacture4.1 Tube shall be made from flat-rolled alloy by an auto-matic welding process with no addition or filler metal. Subse-quent to welding and prior to final annealing, the material shallbe cold-worked in either the weld metal only or both weld andb
11、ase metal.NOTE 1The recommended heat treatment shall consist of heating to atemperature of 1975 to 2150F (1080 to 1180C) for UNS N08354 or2010 to 2100F (1100 to 1150C) for UNS N08925 and UNS N08926,followed by quenching in water or rapid cooling by other means.4.2 Tube shall be furnished with oxide
12、removed. Whenbright annealing is used, descaling is not necessary.5. Chemical Composition5.1 The material shall conform to the composition limitsspecified in Table 1. One test is required for each lot as definedin Specification B 751.1This specification is under the jurisdiction of ASTM Committee B0
13、2 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, 2005. Published July 2005. Originally approvedin 1980. Last previous edition approved in 2004 as B 674 04.* New designation establish
14、ed in accordance with Practice E 527 and SAEJ1086, Practice for Numbering Metals and Alloys (UNS).2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at serviceastm.org. For Annual Book of ASTMStandards volume information, refer to the standards Docu
15、ment Summary page onthe ASTM website.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.5.2 If a product analysis is performed, it shall meet thechemistry limits prescribed in Table 1, subject to the analysistolerances of Specification
16、B 751.6. Mechanical and Other Properties6.1 Mechanical PropertiesThe material shall conform tothe mechanical property requirements specified in Table 2. Onetest is required for each lot as defined in Specification B 751.6.2 Flattening TestA flattening test shall be made on eachend of one tube per lo
17、t. Superficial ruptures resulting fromsurface imperfections shall not be cause for rejection.6.3 Flange TestA flange test shall be made on each end ofone tube per lot.6.4 Nondestructive Test Requirements:6.4.1 Class 1Each piece in each lot shall be subject to oneof the following four tests: hydrosta
18、tic, pneumatic (air under-water), eddy current, or ultrasonic.6.4.2 Class 2Each piece in each lot shall be subjected toa leak test and an electric test as follows:6.4.2.1 Leak TestHydrostatic or pneumatic (air underwa-ter).6.4.2.2 Electric TestEddy current or ultrasonic.6.5 The manufacturer shall ha
19、ve the option to test to Class1 or 2 and select the nondestructive test methods, if notspecified by the purchaser.7. General Requirements7.1 Material furnished under this specification shall con-form to the applicable requirements of the current edition ofSpecification B 751 unless otherwise provide
20、d herein.8. Keywords8.1 UNS N08925; UNS N08354; UNS N08926; weldedtubeASTM International 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 a
21、ny such patent rights, and the riskof infringement of such rights, are entirely their 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
22、invited either for revision of this standard or for additional standardsand should be 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 recei
23、ved a fair hearing you shouldmake your views known to the ASTM Committee on Standards, 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
24、 this standard may be obtained by contacting ASTM at the aboveaddress or at 610-832-9585 (phone), 610-832-9555 (fax), or serviceastm.org (e-mail); or through the ASTM website(www.astm.org).TABLE 1 Chemical RequirementsElementUNS N08925 UNS N08354 UNS N08926Carbon, max 0.020 0.030 0.020Manganese, max
25、 1.00 1.00 2.00Phosphorus, max 0.045 0.030 0.03Sulfur, max 0.030 0.010 0.01Silicon, max 0.50 1.00 0.5Nickel 24.0 to 26.0 34.0 to 36.0 24.00 to 26.00Chromium 19.0 to 21.0 22.0 to 24.0 19.00 to 21.00Molybdenum 6.0 to 7.0 7.0 to 8.0 6.0 to 7.0Copper 0.8 to 1.5 . 0.5 to 1.5Nitrogen 0.1 to 0.2 0.17 to 0.
26、24 0.15 to 0.25Iron balance balance balanceTABLE 2 Mechanical PropertiesAlloy TemperTensile Strength, min,psi (MPa)Yield Strength, 0.2 %offset, min, psi (MPa)Elongation in 2 in. or50 mm (or 4D), min, %UNS N08925 solution annealed 87 (600) 43 (295) 40UNS N08354 solution annealed 93 (640) 43 (295) 40UNS N08926 solution annealed 94 (650) 43 (295) 35B674052
