1、Designation: B 834 95 (Reapproved 2003)Standard 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 fixed desi
2、gnation B 834; 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 (e) indicates an editorial change since the last revision
3、 or reapproval.1. Scope1.1 This specification covers pressure consolidated powdermetallurgy iron-nickel-chromium-molybdenum (UNSN08367) and nickel-chromium-molybdenumcolumbium (Nb)(UNS N06625) pipe flanges, fittings, valves, and parts intendedfor general corrosion or heat-resisting service.1.2 The v
4、alues stated in inch-pound units are to be regardedas the standard. The values given in parentheses are forinformation only.1.3 The following safety hazards caveat pertains only to testmethods portions, Sections 7.3 and 13, of this specification:This standard does not purport to address all of the s
5、afetyconcerns, if any, associated with its use. It is the responsibilityof the user of this standard to establish appropriate safety andhealth practices and to determine the applicability of regula-tory limitations prior to use.2. Referenced Documents2.1 ASTM Standards:2E 8 Test Methods for Tension
6、Testing of Metallic MaterialsE 1473 Test Methods for Chemical Analysis of Nickel,Cobalt, and High-Temperature AlloysG 28 Test Methods for Detecting Susceptibility to Inter-granular Corrosion in Wrought, Nickel-Rich, Chromium-Bearing AlloysG 48 Test Methods for Pitting and Crevice Corrosion Re-sistan
7、ce of Stainless Steels and Related Alloys by Use ofFerric Chloride Solution2.2 Manufacturers Standardization Society of the Valveand Fittings Industry Standard:SP-25 Standard Marking System for Valves, Fittings,Flanges, and Unions32.3 ASME/ANSI Standard:ASME/ANSI B16.5 Pipe Flanges and Flanged Fitti
8、ngs43. Terminology3.1 Definitions of Terms Specific to This Standard:3.1.1 can, nthe container used to encapsulate the powderduring the pressure consolidation process; it is removed fromthe final part.3.1.2 compact, nthe consolidated powder from one can; itmay be used to make one or more parts.3.1.3
9、 fill pin, nthe part of the compact in the spout used tofill the can; it is not usually integral to the part produced.3.1.4 part, na single item coming from a compact, eitherprior to or after machining.3.1.5 powder blend, na homogeneous mixture of powderfrom one or more heats; it is limited to the a
10、mount that can bemixed in the same blender at one time.3.1.6 rough part, nthe part prior to final machining.4. Ordering Information4.1 Orders for material under this specification shouldinclude the following information:4.1.1 Quantity (weight or number of pieces),4.1.2 Name of material or UNS number
11、,4.1.3 Microstructure examination, if required (5.1.4),4.1.4 ASTM designation and year of issue,4.1.5 Inspection (14.1),4.1.6 Whether rough part or finish machined (7.2.2),4.1.7 Supplementary requirements, when applicable, and4.1.8 If possible, the intended end use.5. Materials and Manufacture5.1 Ma
12、nufacturing Practice:5.1.1 Compacts shall be manufactured by placing a singlepowder blend into a can, evacuating the can, and sealing it. The1This specification is under the jurisdiction of ASTM Committee B02 onNonferrous Metals and Alloys and is the direct responsibility of SubcommitteeB02.07 on Re
13、fined Nickel and Cobalt and Their Alloys.Current edition approved Nov. 1, 2003. Published November 2003. Originallyapproved in 1993. Last previous edition approved in 1995 as B 834 95.2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at serviceastm
14、.org. For Annual Book of ASTMStandards volume information, refer to the standards Document Summary page onthe ASTM website.3Available from Manufacturers Standardization Society of the Valve and FittingsIndustry (MSS), 127 Park St., NE, Vienna, VA 22180-4602.4Available from American Society of Mechan
15、ical Engineers (ASME), ASMEInternational Headquarters, Three Park Ave., New York, NY 10016-5990.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.can material shall be selected to ensure that it has no deleteri-ous effect on the final
16、product. The entire assembly shall beheated and placed under sufficient pressure for a sufficientperiod of time to ensure that the final consolidated part is fullydense. The compact may represent one part or a number ofparts may be machined from it.5.1.2 The powder shall be produced by vacuum meltin
17、gfollowed by gas atomization.5.1.3 When powder from more than one heat is used tomake a blend, the heats shall be thoroughly mixed to ensurehomogeneity.5.1.4 When specified on the order, a section of the compactmay be sectioned and the microstructure examined to showporosity and other internal imper
18、fections. This is usuallyperformed on the fill pin. In such cases, the section location andthe question of acceptable and unacceptable microstructureshall be agreed upon by the manufacturer and the purchaser.5.2 Heat Treatment:5.2.1 Alloy N06625 shall be supplied in the solution an-nealed condition.
19、 At the option of the producer, the anneal maybe a separate operation following consolidation or may be partof the consolidation process. In either case, the temperatureshall be 1800F minimum.5.2.2 Alloy N08367 shall be supplied in the solution an-nealed condition.5.2.2.1 The heat treatment shall co
20、nsist of heating to aminimum temperature of 2025F and quenching in water orrapidly cooling by other means.6. Chemical Composition6.1 The material shall conform to the requirements forchemical composition prescribed in Table 1.6.2 If a product (check) analysis is performed by thepurchaser, the materi
21、al shall conform to the product (check)analysis variations prescribed in Table 2.7. Mechanical and Other Requirements7.1 Mechanical PropertiesThe material shall conform tothe requirements for mechanical properties prescribed in Table3 at room temperature.7.2 Hydrostatic TestsAfter machining, valve b
22、odies, fit-tings, and other pressure-containing parts shall be tested to thehydrostatic shell-test pressures prescribed in ASME/ANSIB16.5 for the applicable steel rating for which the compact isdesigned, and shall show no leaks. Parts ordered under thesespecifications for working pressures other tha
23、n those listed inthe American National Standard ratings shall be tested to suchpressures as may be agreed upon between the manufacturer andpurchaser.7.2.1 No hydrostatic test is required for welding neck orother flanges.7.2.2 The compact manufacturer is not required to performpressure tests on rough
24、 parts that are to be finish machined byothers. The fabricator of the finished part is not required topressure test parts that are designed to be pressure containingonly after assembly by welding into a larger structure. How-ever, the manufacturer of such parts is responsible as requiredin 15.1 for
25、the satisfactory performance of the parts under thefinal test required in 7.2.7.3 DensityThe density shall be determined using samplesuspended from a scale and weighed in air and water usingArchimedes principle. The equipment used shall have accu-racy sufficient for the test. The measured value shal
26、l not be lessthan 0.3047 lb/in.3(8.452 gm/cm3) for UNS N06625 and0.2904 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 differencesin micro-porosity.7.4 Microstruc
27、ture ExaminationExaminations shall showsound and reasonably uniform material, free from injuriousporosity, voids, laps, cracks, segregations, and similar objec-tionable defects. The etching can be performed after theconsolidation or final heat treatment. If the sample fails to meetthe requirements o
28、f this section, all parts from that compactshall be rejected.TABLE 1 Chemical RequirementsElementComposition,%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.
29、00 to 10.00 6.00 to 7.00Nickel 58.0 minA23.50 to 25.50Iron 5.00 max balanceACobalt (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 maxAElement shall be determined arithmetically by difference.TABLE 2 Product Analysis
30、ToleranceElementTolerance, Over the Maximum Limit or Under theMinimum 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 speci
31、fied) 0.03 .Columbium (Nb) 0.15 .Aluminum 0.05 .Titanium 0.03 .Nitrogen . 0.01Copper . 0.04TABLE 3 Mechanical Property RequirementsAlloyTensile Strength Yield Strength Elongation,min%ksi MPa ksi MPaN06625N083671109575865550453453103030B 834 95 (2003)28. Dimensions and Permissible Variations8.1 The p
32、arts shall conform to the sizes and shapes specifiedby the purchaser.9. Workmanship, Finish, and Appearance9.1 The parts shall be uniform in quality and condition, andshall be free from injurious imperfections.10. Sampling10.1 LotA lot is defined as follows:10.1.1 A lot for chemical analysis shall c
33、onsist of onepowder blend.10.1.2 A lot for mechanical properties shall consist offinished parts with the same dimensions made from the samepowder blend consolidated in the same hot isostatic press usingthe same pressure, temperature, and time parameters andheat-treated in the same final heat-treatme
34、nt charge.10.1.3 A lot for density shall be all parts from the samecompact.10.2 Test Material Selection:10.2.1 Chemical AnalysisRepresentative samples shall betaken after powder blending or during subsequent processing.10.2.1.1 Check Analysis shall be wholly the responsibilityof the purchaser.10.2.2
35、 Mechanical PropertiesTest specimens shall betaken from compacts in the final heat-treated condition fromlocations in that lot in order to be representative of that lot.10.2.3 DensityTest specimens shall be taken from the fillpin of each compact after consolidation or after final heat-treatment.11.
36、Number of Tests11.1 Chemical AnalysisOne test per lot.11.2 Mechanical PropertiesOne test per lot.11.3 DensityOne test per lot.12. Specimen Preparation12.1 The tension test specimens taken from the compactshall be machined to the form and dimensions of the standard2-in. (50.8-mm) gage length tension
37、test specimen shown inFig. 8 of Test Methods E 8, except as specified in 12.2.12.2 In the case of small sections from which a standard testspecimen (specified in 12.1) cannot be taken, the tension testspecimen shall be as large as feasible and its dimensions shallbe proportional to those shown in Fi
38、g. 8 of Test Methods E 8.The gage length for measuring elongation shall be four timesthe diameter of the specimen.12.3 For the purpose of tests, extra compacts or test barsshall be provided as necessary. The test specimen, if cut froma flange, shall be cut tangentially from the flange portionapproxi
39、mately midway between the inner and outer surfacesand approximately midway between the front and back faces.Test bar compacts made separately must be processed in thesame manner as the parts.13. Test Methods13.1 The chemical composition and mechanical propertiesof the material as enumerated in this
40、specification shall, in thecase of disagreement, be determined in accordance with thefollowing test methods:Test ASTM Test MethodsChemical analysis E 1473Tension E 814. Inspection14.1 If specified, source inspection of the material by thepurchaser at the manufacturers plant shall be made as agreedup
41、on between the manufacturer and the purchaser as part of thepurchase contract.15. Rejection and Rehearing15.1 Material tested by the purchaser that fails to conform tothe requirements of this specification may be rejected. Rejec-tion should be reported to the supplier promptly and in writing.In case
42、 of dissatisfaction with the results of the test, theproducer or supplier may make claim for a rehearing.16. Certification16.1 When specified in the purchase order or contract, aproducers or suppliers certification shall be furnished to thepurchaser stating that the material was manufactured, sample
43、d,tested, and inspected in accordance with this specification andhas been found to meet its requirements. When specified in thepurchase order or contract, a report of the test results shall befurnished.17. Product Marking17.1 Identification marks consisting of the manufacturerssymbol or name, design
44、ation of service rating, specificationnumber, grade of material, and size shall be stamped legibly oneach part in accordance with MSS SP-25, and in such positionas not to injure the usefulness of the part.18. Keywords18.1 compact; iron-nickel-chromium-molybdenum; nickel-chromium-molybdenum-columbium
45、; powder parts; pressureconsolidated powder metallurgy; UNS N06625; UNS N08367B 834 95 (2003)3SUPPLEMENTARY REQUIREMENTSThe following supplementary requirements shall be applied when specified by the purchaser in theinquiry, contract, or order.S1. Corrosion TestsS1.1 UNS N06625 shall be tested in ac
46、cordance with TestMethods G 28 and UNS N08367 in accordance with TestMethods G 48. Acceptance criteria shall be a matter of agree-ment between the manufacturer and purchaser.ASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mention
47、edin 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 their own responsibility.This standard is subject to revision at any time by the responsible technical committee and
48、 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 be addressed to ASTM International Headquarters. Your comments will receive careful consideration at a meeting of
49、 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 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 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
