1、Designation: B834 95 (Reapproved 2009)B834 13Standard Specification forPressure Consolidated Powder Metallurgy Iron-Nickel-Chromium-Molybdenum (UNS N08367) and Nickel-Chromium-Molybdenum-Columbium (Nb) (UNS N06625)Alloy Pipe Flanges, Fittings, Valves, and Parts1This standard is issued under the fixe
2、d designation B834; 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 parentheses indicates the year of last reapproval. Asuperscript epsilon () indicates an editorial change since the last revi
3、sion or reapproval.1. Scope Scope*1.1 This specification covers pressure consolidated powder metallurgy iron-nickel-chromium-molybdenum (UNS N08367) andnickel-chromium-molybdenumcolumbium (Nb) (UNS N06625) pipe flanges, fittings, valves, and parts intended for generalcorrosion or heat-resisting serv
4、ice.1.1.1 UNS N06625 products are furnished in two grades of different heat-treated conditions:1.1.1.1 Grade 1 (annealed)Material is normally employed in service temperatures up to 1100F (593C).1.1.1.2 Grade 2 (solution annealed)Material is normally employed in service temperatures above 1100F (593C
5、) whenresistance to creep and rupture is required.1.2 UNS N08367 products are furnished in the solution annealed condition.1.3 The values stated in inch-pound units are to be regarded as standard. The values given in parentheses are mathematicalconversions to SI units that are provided for informati
6、on only and are not considered standard.1.4 The following safety hazards caveat pertains only to test methods portions, Sections 7.3 and 13, of this specification:Thisstandard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the use
7、rof this standard to become familiar with all hazards including those identified in the appropriate Material Safety Data Sheet(MSDS) for this product/material as provided by the manufacturer, to establish appropriate safety and health practices, and todetermine the applicability of regulatory limita
8、tions prior to use.2. Referenced Documents2.1 ASTM Standards:2E8 Test Methods for Tension Testing of Metallic MaterialsE1473 Test Methods for Chemical Analysis of Nickel, Cobalt, and High-Temperature AlloysG28 Test Methods for Detecting Susceptibility to Intergranular Corrosion in Wrought, Nickel-Ri
9、ch, Chromium-Bearing AlloysG48 Test Methods for Pitting and Crevice Corrosion Resistance of Stainless Steels and RelatedAlloys by Use of Ferric ChlorideSolution2.2 Manufacturers Standardization Society of the Valve and Fittings Industry Standard:3SP-25 Standard Marking System for Valves, Fittings, F
10、langes, and Unions2.3 ASME/ANSI Standard:4ASME/ANSI B16.5 Pipe Flanges and Flanged Fittings3. Terminology3.1 Definitions of Terms Specific to This Standard:1 This specification is under the jurisdiction ofASTM Committee B02 on Nonferrous Metals andAlloys and is the direct responsibility of Subcommit
11、tee B02.07 on RefinedNickel and Cobalt and Their Alloys.Current edition approved Oct. 1, 2009Oct. 1, 2013. Published October 2009October 2013. Originally approved in 1993. Last previous edition approved in 20032009 asB834 95 (2003).(2009). DOI: 10.1520/B0834-95R09.10.1520/B0834-13.2 For referencedAS
12、TM standards, visit theASTM website, www.astm.org, or contactASTM Customer Service at serviceastm.org. For Annual Book of ASTM Standardsvolume information, refer to the standards Document Summary page on the ASTM website.3 Available from Manufacturers Standardization Society of the Valve and Fitting
13、s Industry (MSS), 127 Park St., NE, Vienna, VA 22180-4602, http:/www.mss-.4 Available from American Society of Mechanical Engineers (ASME), ASME International Headquarters, Three Park Ave., New York, NY 10016-5990, http:/www.asme.org.This document is not an ASTM standard and is intended only to prov
14、ide the user of an ASTM standard an indication of what changes have been made to the previous version. Becauseit may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current versionof the
15、standard as published by ASTM is to be considered the official document.*A Summary of Changes section appears at the end of this standardCopyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States13.1.1 can, nthe container used to encapsulate the
16、 powder during the pressure consolidation process; it is removed from thefinal part.3.1.2 compact, nthe consolidated powder from one can; it may be used to make one or more parts.3.1.3 fill pin, nthe part of the compact in the spout used to fill the can; it is not usually integral to the part produc
17、ed.3.1.4 part, na single item coming from a compact, either prior to or after machining.3.1.5 powder blend, na homogeneous mixture of powder from one or more heats; it is limited to the amount that can be mixedin the same blender at one time.3.1.6 rough part, nthe part prior to final machining.4. Or
18、dering Information4.1 Orders for material under this specification should include the following information:4.1.1 Quantity (weight or number of pieces),4.1.2 Name of material or UNS number,4.1.3 Condition (UNS N06625),4.1.4 Microstructure examination, if required (5.1.4),4.1.5 ASTM designation and y
19、ear of issue,4.1.6 Inspection (14.1),4.1.7 Whether rough part or finish machined (7.2.2),4.1.8 Supplementary requirements, when applicable, and4.1.9 If possible, the intended end use.5. Materials and Manufacture5.1 Manufacturing Practice:5.1.1 Compacts shall be manufactured by placing a single powde
20、r blend into a can, evacuating the can, and sealing it. The canmaterial shall be selected to ensure that it has no deleterious effect on the final product. The entire assembly shall be heated andplaced under sufficient pressure for a sufficient period of time to ensure that the final consolidated pa
21、rt is fully dense. The compactmay represent one part or a number of parts may be machined from it.5.1.2 The powder shall be produced by vacuum melting followed by gas atomization.5.1.3 When powder from more than one heat is used to make a blend, the heats shall be thoroughly mixed to ensurehomogenei
22、ty.5.1.4 When specified on the order, a section of the compact may be sectioned and the microstructure examined to show porosityand other internal imperfections. This is usually performed on the fill pin. In such cases, the section location and the question ofacceptable and unacceptable microstructu
23、re shall be agreed upon by the manufacturer and the purchaser.5.2 Heat Treatment:5.2.1 Alloy N06625 shall be supplied in the solution annealed condition. At the option of the producer, the anneal may be aseparate operation following consolidation or may be part of the consolidation process. In eithe
24、r case, the temperature shall be1800F minimum.either:5.2.1.1 Grade 1: The annealed condition. At the option of the producer, the anneal may be a separate operation followingconsolidation or may be part of the consolidation process. In either case, the temperature shall be 1600F (871C) minimum.or5.2.
25、1.2 Grade 2: The solution annealed condition. At the option of the producer, the anneal may be a separate operationfollowing consolidation or may be part of the consolidation process. In either case, the temperature shall be 1800F (1093C)minimum.5.2.2 Alloy N08367 shall be supplied in the solution a
26、nnealed condition.5.2.2.1 The heat treatment shall consist of heating to a minimum temperature of 2025F and quenching in water or rapidlycooling by other means.6. Chemical Composition6.1 The material shall conform to the requirements for chemical composition prescribed in Table 1.6.2 If a product (c
27、heck) analysis is performed by the purchaser, the material shall conform to the product (check) analysisvariations prescribed in Table 2.B834 1327. Mechanical and Other Requirements7.1 Mechanical PropertiesThe material shall conform to the requirements for mechanical properties prescribed in Table 3
28、 atroom temperature.7.2 Hydrostatic TestsAfter machining, valve bodies, fittings, and other pressure-containing parts shall be tested to thehydrostatic shell-test pressures prescribed inASME/ANSI B16.5 for the applicable steel rating for which the compact is designed,and shall show no leaks. Parts o
29、rdered under these specifications for working pressures other than those listed in the AmericanNational Standard ratings shall be tested to such pressures as may be agreed upon between the manufacturer and purchaser.7.2.1 No hydrostatic test is required for welding neck or other flanges.TABLE 1 Chem
30、ical RequirementsElement Composition,%UNS N06625 UNS N08367Carbon, max 0.10 0.030Manganese, max 0.50 2.00Silicon, max 0.50 1.00Phosphorus, max 0.015 0.040Sulfur, max 0.015 0.030Chromium 20.00 to 23.00 20.00 to 22.00Molybdenum 8.00 to 10.00 6.00 to 7.00Nickel 58.0 minA 23.50 to 25.50Iron 5.00 max bal
31、anceACobalt (when specified) 1.00 max .Columbium (Nb) 3.15 to 4.15 .Aluminum 0.50 max .Titanium 0.40 max .Nitrogen . 0.18 to 0.25Copper . 0.75 maxA Element shall be determined arithmetically by difference.TABLE 2 Product Analysis ToleranceElementTolerance, Over the Maximum Limit or Under theMinimum
32、Limit, %UNS N06625 UNS N08367Carbon, max 0.01 0.005Manganese, max 0.03 0.04Silicon, max 0.03 0.05Phosphorus, max 0.005 0.005Sulfur, max 0.003 0.005Chromium 0.25 0.25Molybdenum 0.15 0.15Nickel 0.35 0.25Iron 0.07 .Cobalt (when specified) 0.03 .Columbium (Nb) 0.15 .Aluminum 0.05 .Titanium 0.03 .Nitroge
33、n . 0.01Copper . 0.04TABLE 3 Mechanical Property Requirementscolwidth=“0.47in“ colname=“col3“ colwidth=“0.67in“ colname=“col4“ colwidth=“0.57in“ colname=“col5“colwidth=“0.52in“Alloy TensileStrength Yield Strength Elongation,min%ksi MPa ksi MPaN06625N083671109575865550453453103030TABLE 3 Mechanical P
34、roperty RequirementsAlloy Condition Tensile Strength Yield Strength Elongation,min%ksi MPa ksi MPAN06625 Grade 1 (annealed) 120 827 60 414 30N06625 Grade 2 (solution annealed) 110 758 50 345 30N08367 Solutionannealed95 655 45 310 30B834 1337.2.2 The compact manufacturer is not required to perform pr
35、essure tests on rough parts that are to be finish machined by others.The fabricator of the finished part is not required to pressure test parts that are designed to be pressure containing only afterassembly by welding into a larger structure. However, the manufacturer of such parts is responsible as
36、 required in 15.1 for thesatisfactory performance of the parts under the final test required in 7.2.7.3 DensityThe density shall be determined using sample suspended from a scale and weighed in air and water usingArchimedesArchimedes principle. The equipment used shall have accuracy sufficient for t
37、he test. The measured value shall notbe less than 0.3047 lb/in.3 (8.452 gm/cm3) for UNS N06625 and 0.2904 lb/in.3 (8.055 gm/cm3) for UNS N08367. (See Note 1.)NOTE 1The density is a function of alloy variations. Because of this, density differences may be the result of either alloy content or differe
38、nces inmicro-porosity.7.4 Microstructure ExaminationExaminations shall show sound and reasonably uniform material, free from injuriousporosity, voids, laps, cracks, segregations, and similar objectionable defects. The etching can be performed after the consolidationor final heat treatment. If the sa
39、mple fails to meet the requirements of this section, all parts from that compact shall be rejected.8. Dimensions and Permissible Variations8.1 The parts shall conform to the sizes and shapes specified by the purchaser.9. Workmanship, Finish, and Appearance9.1 The parts shall be uniform in quality an
40、d condition, and shall be free from injurious imperfections.10. Sampling10.1 LotA lot is defined as follows:10.1.1 A lot for chemical analysis shall consist of one powder blend.10.1.2 A lot for mechanical properties shall consist of finished parts with the same dimensions made from the same powderbl
41、end consolidated in the same hot isostatic press using the same pressure, temperature, and time parameters and heat-treated inthe same final heat-treatment charge.10.1.3 A lot for density shall be all parts from the same compact.10.2 Test Material Selection:10.2.1 Chemical AnalysisRepresentative sam
42、ples shall be taken after powder blending or during subsequent processing.10.2.1.1 Check Analysis shall be wholly the responsibility of the purchaser.10.2.2 Mechanical PropertiesTest specimens shall be taken from compacts in the final heat-treated condition from locationsin that lot in order to be r
43、epresentative of that lot.10.2.3 DensityTest specimens shall be taken from the fill pin of each compact after consolidation or after final heat-treatment.11. Number of Tests11.1 Chemical AnalysisOne test per lot.11.2 Mechanical PropertiesOne test per lot.11.3 DensityOne test per lot.12. Specimen Pre
44、paration12.1 The tension test specimens taken from the compact shall be machined to the form and dimensions of the standard 2-in.(50.8-mm) gage length tension test specimen shown in Fig. 8 of Test Methods E8, except as specified in 12.2.12.2 In the case of small sections from which a standard test s
45、pecimen (specified in 12.1) cannot be taken, the tension testspecimen shall be as large as feasible and its dimensions shall be proportional to those shown in Fig. 8 of Test Methods E8. Thegage length for measuring elongation shall be four times the diameter of the specimen.12.3 For the purpose of t
46、ests, extra compacts or test bars shall be provided as necessary. The test specimen, if cut from a flange,shall be cut tangentially from the flange portion approximately midway between the inner and outer surfaces and approximatelymidway between the front and back faces. Test bar compacts made separ
47、ately must be processed in the same manner as the parts.13. Test Methods13.1 The chemical composition and mechanical properties of the material as enumerated in this specification shall, in the caseof disagreement, be determined in accordance with the following test methods:Test ASTM Test MethodsChe
48、mical analysis E1473Tension E8B834 13414. Inspection14.1 If specified, source inspection of the material by the purchaser at the manufacturersmanufacturers plant shall be made asagreed upon between the manufacturer and the purchaser as part of the purchase contract.15. Rejection and Rehearing15.1 Ma
49、terial tested by the purchaser that fails to conform to the requirements of this specification may be rejected. Rejectionshould be reported to the supplier promptly and in writing. In case of dissatisfaction with the results of the test, the producer orsupplier may make claim for a rehearing.16. Certification16.1 When specified in the purchase order or contract, a producersproducers or supplierssuppliers certification shall befurnished to the purchaser stating that the material was manufactured, sampled, tested, and inspected in a
