1、Designation: B834 17Standard Specification forPressure Consolidated Powder Metallurgy Iron-Nickel-Chromium-Molybdenum (UNS N08367), Nickel-Chromium-Molybdenum-Columbium (Nb) (UNS N06625), Nickel-Chromium-Iron Alloys (UNS N06600 and N06690), andNickel-Chromium-Iron-Columbium-Molybdenum (UNSN07718) Al
2、loy Pipe Flanges, Fittings, Valves, and Parts1This standard is issued under the fixed 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 r
3、eapproval. Asuperscript epsilon () indicates an editorial change since the last revision or reapproval.1. Scope*1.1 This specification covers pressure consolidated powdermetallurgy iron-nickel-chromium-molybdenum (UNSN08367) and nickel-chromium-molybdenumcolumbium (Nb)(UNS N06625), nickel-chromium-i
4、ron alloys (UNS N06600and N06690), and nickel-chromium-iron-columbium (Nb)-molybdenum (UNS N07718) alloy pipe flanges, fittings,valves, and parts intended for general corrosion or heat-resisting service.1.1.1 UNS N06625 products are furnished in two grades ofdifferent heat-treated conditions:1.1.1.1
5、 Grade 1 (annealed)Material is normally employedin service temperatures up to 1100F (593C).1.1.1.2 Grade 2 (solution annealed)Material is normallyemployed in service temperatures above 1100F (593C) whenresistance to creep and rupture is required.1.2 UNS N08367 products are furnished in the solutiona
6、nnealed condition.1.3 UNS N06600 products are furnished in the annealedcondition.1.4 UNS N06690 products are furnished in the annealedcondition.1.5 UNS N07718 products are furnished in the solutionannealed + precipitation hardened condition.1.6 The values stated in inch-pound units are to be regarde
7、das standard. The values given in parentheses are mathematicalconversions to SI units that are provided for information onlyand are not considered standard.1.7 The following safety hazards caveat pertains only to testmethods portions, Sections 7.3 and 13, of this specification:This standard does not
8、 purport to address all of the safetyconcerns, if any, associated with its use. It is the responsibilityof the user of this standard to become familiar with all hazardsincluding those identified in the appropriate Safety Data Sheet(SDS) for this product/material as provided by themanufacturer, to es
9、tablish appropriate safety, health, andenvironmental practices, and to determine the applicability ofregulatory limitations prior to use.1.8 This international standard was developed in accor-dance with internationally recognized principles on standard-ization established in the Decision on Principl
10、es for theDevelopment of International Standards, Guides and Recom-mendations issued by the World Trade Organization TechnicalBarriers to Trade (TBT) Committee.2. Referenced Documents2.1 ASTM Standards:2E3 Guide for Preparation of Metallographic SpecimensE8/E8M Test Methods for Tension Testing of Me
11、tallic Ma-terialsE29 Practice for Using Significant Digits in Test Data toDetermine Conformance with SpecificationsE1473 Test Methods for Chemical Analysis of Nickel, Co-balt and High-Temperature AlloysG28 Test Methods for Detecting Susceptibility to Inter-granular Corrosion in Wrought, Nickel-Rich,
12、 Chromium-Bearing AlloysG48 Test Methods for Pitting and Crevice Corrosion Resis-tance of Stainless Steels and Related Alloys by Use ofFerric Chloride Solution1This specification is under the jurisdiction of ASTM Committee B02 onNonferrous Metals and Alloys and is the direct responsibility of Subcom
13、mitteeB02.07 on Refined Nickel and Cobalt and Their Alloys.Current edition approved Nov. 1, 2017. Published November 2017. Originallyapproved in 1993. Last previous edition approved in 2015 as B834 15. DOI:10.1520/B0834-17.2For referenced ASTM standards, visit the ASTM website, www.astm.org, orconta
14、ct ASTM Customer Service at serviceastm.org. For Annual Book of ASTMStandards volume information, refer to the standards Document Summary page onthe ASTM website.*A Summary of Changes section appears at the end of this standardCopyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Co
15、nshohocken, PA 19428-2959. United StatesThis international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for theDevelopment of International Standards, Guides and Recommendations issued by the World Trade
16、Organization Technical Barriers to Trade (TBT) Committee.12.2 Manufacturers Standardization Society of the Valve andFittings Industry Standard:3SP-25 Standard Marking System for Valves, Fittings,Flanges, and Unions2.3 ASME/ANSI Standard:4ASME/ANSI B16.5 Pipe Flanges and Flanged FittingsASME Boiler a
17、nd Pressure Vessel CodeSection ISection IIISection IVSection VIIISection XIIASME B31.1 Power PipingASME B31.3 Process Piping3. 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 remove
18、d 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 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
19、to or after machining.3.1.5 powder blend, na homogeneous mixture of powderfrom one or more heats; it is limited to the amount 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
20、shouldinclude 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 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,
21、 when applicable, and4.1.8 If possible, the intended end use.5. Materials and Manufacture5.1 Manufacturing Practice:5.1.1 Compacts shall be manufactured by placing a singlepowder blend into a can, evacuating the can, and sealing it. Thecan material shall be selected to ensure that it has no deleteri
22、-ous effect on the final 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
23、produced by vacuum meltingfollowed 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 Powder shall be protected during storage to preventthe detrimental pick-up of oxygen and other contaminants.5.2 Heat
24、Treatment:5.2.1 Alloy N06625 shall be supplied in either:5.2.1.1 Grade 1: The annealed condition. At the option ofthe producer, the anneal may be a separate operation followingconsolidation or may be part of the consolidation process. Ineither case, the temperature shall be 1600F (871C) minimum,or5.
25、2.1.2 Grade 2: The solution annealed condition. At theoption of the producer, the anneal may be a separate operationfollowing consolidation or may be part of the consolidationprocess. In either case, the temperature shall be 2000F(1093C) minimum.5.2.2 Alloy N08367 shall be supplied in the solution a
26、n-nealed condition.5.2.2.1 The heat treatment shall consist of heating to aminimum temperature of 2025F and quenching in water orrapidly cooling by other means.5.2.3 Alloy N06600 shall be supplied in the annealedcondition. The temperature shall be 1750F (954C) minimum,A.C. or faster.5.2.4 Alloy N066
27、90 shall be supplied in the annealedcondition. The temperature shall be 1950F (1066C)minimum, with a minimum holding time of 30 min. Thematerial shall be water quenched.5.2.5 Alloy N07718 shall be supplied in the solution +precipitation hardened condition. The recommended solutiontemperature is 1700
28、 to 1850F (924 to 1010C) hold12 hminimum, cool at rate equivalent to air cool or faster. Theprecipitation hardening treatment is 1325 6 25F (718 614C). Hold at temperature for 8 h, furnace cool to 1150 625F (621 6 14C), hold until total precipitation heat treatmenttime has reached 18 h, and air cool
29、.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 material shall conform to the product (check)analysis variations prescribed in Table 2.7. Mechanical and Other
30、Requirements7.1 Mechanical PropertiesThe material shall conform tothe requirements for mechanical properties prescribed in Table3 at room temperature.7.2 Hydrostatic TestsAfter machining, valve bodies,fittings, and other pressure-containing parts shall be tested tothe hydrostatic shell-test pressure
31、s prescribed in ASME/ANSIB16.5 for the applicable steel rating for which the compact isdesigned, and shall show no leaks. Parts ordered under these3Available from Manufacturers Standardization Society of the Valve and FittingsIndustry (MSS), 127 Park St., NE, Vienna, VA 22180-4602, http:/www.mss-.4A
32、vailable from American Society of Mechanical Engineers (ASME), ASMEInternational Headquarters, Three Park Ave., New York, NY 10016-5990, http:/www.asme.org.B834 172specifications for working pressures other than those listed inthe American National Standard ratings shall be tested to suchpressures a
33、s 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 parts that are to be finish machined byothers. The fabricator of the finished part is not
34、 required topressure test parts that are designed to be pressure containingonly after assembly by welding into a larger structure.However, the manufacturer of such parts is responsible asrequired in 15.1 for the satisfactory performance of the partsunder the final test required in 7.2.7.3 DensityThe
35、 density shall be determined for onesample from each production lot. The sample shall be sus-pended 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 shall not be lessthan 0.3047 lb/in.3(8.452 gm/c
36、m3) for UNS N06625, 0.2904lb/in.3(8.055 gm/cm3) for UNS N08367, 0.3029 lb/in.3(8.385TABLE 1 Chemical RequirementsElementComposition,%UNS N06625 UNS N08367 UNS N06600 UNS N06690 UNS N07718Carbon, max 0.10 0.030 0.15 0.05 0.08Manganese, max 0.50 2.00 1.0 0.5 0.35Silicon, max 0.50 1.00 0.5 0.5 0.35Phos
37、phorus, max 0.015 0.040 . . 0.015Sulfur, max 0.015 0.030 0.015 0.015 0.015Chromium 20.00 to 23.00 20.00 to 22.00 14.0 to 17.0 27.0 to 31.0 17.0 to 21.0Molybdenum 8.00 to 10.00 6.00 to 7.00 . . 2.80 to 3.30Nickel 58.0 minA23.50 to 25.50 72.0 min 58.0 min 50.0 to 55.0Iron 5.00 max remainderA6.0 to 10.
38、0 7.0 to 11.0 remainderACobalt (when specified) 1.00 max . . . 1.0 maxColumbium (Nb) 3.15 to 4.15 . . . 4.75 to 5.50BAluminum 0.50 max . . . 0.20 to 0.80Titanium 0.40 max . . . 0.65 to 1.15Nitrogen . 0.18 to 0.25 . . .Copper . 0.75 max 0.5 max 0.5 max 0.30 maxAElement shall be determined arithmetica
39、lly by difference.BColumbium (Nb) + tantalum.TABLE 2 Product Analysis ToleranceElementTolerance, Over the Maximum Limit or Under theMinimum Limit, %UNS N06625 UNS N08367 UNS N06600 UNS N06690 UNS N07718Carbon, max 0.01 0.005 0.01 0.01 0.01Manganese, max 0.03 0.04 0.03 0.03 0.03Silicon, max 0.03 0.05
40、 0.03 0.03 0.03Phosphorus, max 0.005 0.005 . . 0.005Sulfur, max 0.003 0.005 0.003 0.003 0.003Chromium 0.25 0.25 0.25 0.30 0.25Molybdenum 0.15 0.15 . . 0.10Nickel 0.35 0.25 0.45 0.35 0.35Iron 0.07 . 0.10 0.15 .Cobalt (when specified) 0.03 . . . .Columbium (Nb) 0.15 . . . 0.20Aluminum 0.05 . . . 0.10T
41、itanium 0.03 . . . 0.05Nitrogen . 0.01 . . .Copper . 0.04 0.03 0.03 0.03TABLE 3 Mechanical Property RequirementsAlloy Condition Tensile Strength Yield StrengthElongation,min%ksi MPa ksi MPAN06600 Annealed 85 585 35 240 30N06625 Grade 1 (annealed) 120 827 60 414 30N06625 Grade 2 (solution annealed) 1
42、10 758 50 345 30N06690 Annealed 85 585 35 240 30N07718 Solution annealed +precipitation hardened185 1275 150 1034 12N08367 Solution annealed 95 655 45 310 30B834 173gm/cm3) for UNS N06600, 0.2930 lb/in.3) (8.111 gm/cm3) forUNS N06690, and 0.2940 lb/in.3(8.139 gm/cm3) for UNSN07718. (See Note 1.)NOTE
43、 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.8. Dimensions and Permissible Variations8.1 The parts shall conform to the sizes and shapes specifiedby the purchaser.9. Workmanship, Finish,
44、 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 consist of onepowder blend.10.1.2 A lot for mechanical properties shall consist offinished pa
45、rts 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-treatment charge.10.1.3 A lot for density shall be all parts from the samecompact.10.2 Test Materia
46、l Selection:10.2.1 Chemical AnalysisRepresentative samples shall betaken after powder blending or during subsequent processing.10.2.1.1 Check Analysis shall be from one part from each lotof parts. The composition of the sample shall conform to thechemical requirements prescribed in Table 1.10.2.2 Me
47、chanical PropertiesTest specimens shall betaken from the component, stem, protrusion, or test part madefrom a single powder blend consolidated in the same hotisostatic press using the same pressure, temperature, and timeparameters and heat-treated in the same final heat-treatmentcharge.10.2.3 Densit
48、yTest specimens shall be taken from the fillpin 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 Preparation12.1 The tension test specimens
49、shall be machined to theform and dimensions of the standard 2-in. (50.8-mm) gagelength tension test specimen shown in Fig. 8 of Test MethodsE8/E8M, 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 Fig. 8 of Test MethodsE8/E8M. The gage length for measuring elongation shall befour times the diameter of the specimen.12.3 For the purpose of
