1、Designation: B834 15B834 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 (UNSN07
2、718) Alloy 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
3、 last reapproval. Asuperscript epsilon () indicates an editorial change since the last revision or reapproval.1. Scope*1.1 This specification covers pressure consolidated powder metallurgy iron-nickel-chromium-molybdenum (UNS N08367) andnickel-chromium-molybdenumcolumbium (Nb) (UNS N06625), nickel-c
4、hromium-iron alloys (UNS N06600 and N06690), andnickel-chromium-iron-columbium (Nb)-molybdenum (UNS N07718) alloy pipe flanges, fittings, valves, and parts intended forgeneral corrosion or heat-resisting service.1.1.1 UNS N06625 products are furnished in two grades of different heat-treated conditio
5、ns: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) whenresistance to creep and rupture is required.1.2 UNS N08367 products are furnished in t
6、he solution annealed condition.1.3 UNS N06600 products are furnished in the annealed condition.1.4 UNS N06690 products are furnished in the annealed condition.1.5 UNS N07718 products are furnished in the solution annealed + precipitation hardened condition.1.6 The values stated in inch-pound units a
7、re to be regarded as standard. The values given in parentheses are mathematicalconversions to SI units that are provided for information only and are not considered standard.1.7 The following safety hazards caveat pertains only to test methods portions, Sections 7.3 and 13, of this specification: Th
8、isstandard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the userof this standard to become familiar with all hazards including those identified in the appropriate Safety Data Sheet (SDS) for thisproduct/material as provided by t
9、he manufacturer, to establish appropriate safety safety, health, and healthenvironmentalpractices, and to determine the applicability of regulatory limitations prior to use.1.8 This international standard was developed in accordance with internationally recognized principles on standardizationestabl
10、ished in the Decision on Principles for the Development of International Standards, Guides and Recommendations issuedby the World Trade Organization Technical Barriers to Trade (TBT) Committee.2. Referenced Documents2.1 ASTM Standards:2E3 Guide for Preparation of Metallographic SpecimensE8E8/E8M Tes
11、t Methods for Tension Testing of Metallic MaterialsE29 Practice for Using Significant Digits in Test Data to Determine Conformance with Specifications1 This specification is under the jurisdiction ofASTM Committee B02 on Nonferrous Metals andAlloys and is the direct responsibility of Subcommittee B0
12、2.07 on RefinedNickel and Cobalt and Their Alloys.Current edition approved Oct. 1, 2015Nov. 1, 2017. Published October 2015November 2017. Originally approved in 1993. Last previous edition approved in 20132015as B834 13.B834 15. DOI: 10.1520/B0834-15.10.1520/B0834-17.2 For referencedASTM standards,
13、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.This document is not an ASTM standard and is intended only to provide the user of an ASTM sta
14、ndard 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 standard as published by AS
15、TM 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 States1E1473 Test Methods for Chemical Analysis of Nickel, Cobalt and High-Temperat
16、ure AlloysG28 Test Methods for Detecting Susceptibility to Intergranular Corrosion in Wrought, Nickel-Rich, Chromium-Bearing AlloysG48 Test Methods for Pitting and Crevice Corrosion Resistance of Stainless Steels and RelatedAlloys by Use of Ferric ChlorideSolution2.2 Manufacturers Standardization So
17、ciety of the Valve and Fittings 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 and Pressure Vessel CodeSection ISection IIISection IVSection VIIISection XIIASME B31.1 Power
18、 PipingASME B31.3 Process Piping3. Terminology3.1 Definitions of Terms Specific to This Standard:3.1.1 can, nthe container used to encapsulate the 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 t
19、o 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 produced.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 m
20、ore 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. Ordering Information4.1 Orders for material under this specification should include the following information:4.1.1 Quantity (weight or number of pieces),4.
21、1.2 Name of material or UNS number,4.1.3 Condition (UNS N06625),4.1.4 Microstructure examination, if required (5.1.4),4.1.4 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 po
22、ssible, the intended end use.5. Materials and Manufacture5.1 Manufacturing Practice:5.1.1 Compacts shall be manufactured by placing a single powder 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
23、. The entire assembly shall be heated andplaced under sufficient pressure for a sufficient period of time to ensure that the final consolidated part 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 fol
24、lowed 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 ensurehomogeneity.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 imperfe
25、ctions. This is usually performed on the fill pin. In such cases, the section location and the question ofacceptable and unacceptable microstructure shall be agreed upon by the manufacturer and the purchaser.Powder shall be protectedduring storage to prevent the detrimental pick-up of oxygen and oth
26、er contaminants.3 Available from Manufacturers Standardization Society of the Valve and Fittings 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 10
27、016-5990, http:/www.asme.org.B834 1725.2 Heat Treatment:5.2.1 Alloy N06625 shall be supplied in 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, th
28、e temperature shall be 1600F (871C)minimum.minimum, oror5.2.1.2 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 1800F2000F(1093
29、C) minimum.5.2.2 Alloy N08367 shall be supplied in the solution annealed 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.5.2.3 Alloy N06600 shall be supplied in the annealed condition. The tempera
30、ture shall be 1750F (954C) minimum, A.C. orfaster.5.2.4 Alloy N06690 shall be supplied in the annealed condition. The temperature shall be 1950F (1066C) minimum, with aminimum holding time of 30 min. The material shall be water quenched.5.2.5 Alloy N07718 shall be supplied in the solution + precipit
31、ation hardened condition.The recommended solution temperatureis 1700 to 1850F (924 to 1010C) hold 12 h minimum, cool at rate equivalent to air cool or faster. The precipitation hardeningtreatment is 1325 6 25F (718 6 14C). Hold at temperature for 8 h, furnace cool to 1150 6 25F (621 6 14C), hold unt
32、il totalprecipitation heat treatment time has reached 18 h, and air cool.6. Chemical Composition6.1 The material shall conform to the requirements for chemical composition prescribed in Table 1.6.2 If a product (check) analysis is performed by the purchaser, the material shall conform to the product
33、 (check) analysisvariations prescribed in Table 2.7. Mechanical and Other Requirements7.1 Mechanical PropertiesThe material shall conform to the requirements for mechanical properties prescribed in Table 3 atroom temperature.7.2 Hydrostatic TestsAfter machining, valve bodies, fittings, and other pre
34、ssure-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 ordered under these specifications for working pressures other than those listed in the American
35、National 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.7.2.2 The compact manufacturer is not required to perform pressure tests on rough parts that are to be fini
36、sh 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 required in 15.1 for thesatisfactory performan
37、ce of the parts under the final test required in 7.2.TABLE 1 Chemical RequirementsElementElement Composition,%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 0.35Phosphorus, max 0.015 0.040
38、 . . 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 minA 23.50 to 25.50 72.0 min 58.0 min 50.0 to 55.0Iron 5.00 max balanceA 6.0 to 10.0 7.0 to 11.0 remainder
39、AIron 5.00 max remainderA 6.0 to 10.0 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 maxA El
40、ement shall be determined arithmetically by difference.B Columbium (Nb) + tantalum.B834 1737.3 DensityThe density shall be determined for one sample from each production lot. The sample shall be suspended froma scale and weighed in air and water using Archimedes principle. The equipment used shall h
41、ave accuracy sufficient for the test.The measured value shall not be less than 0.3047 lb/in.3 (8.452 gm/cm3) for UNS N06625, 0.2904 lb/in.3 (8.055 gm/cm3) for UNSN08367, 0.3029 lb/in.3 (8.385 gm/cm3) for UNS N06600, 0.2930 lb/in.3) (8.111 gm/cm3) for UNS N06690, and 0.2940 lb/in.3(8.139 gm/cm3) for
42、UNS N07718. (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 differences inmicro-porosity.7.4 Microstructure ExaminationExaminations shall show sound and reasonably uniform material, free from injuriou
43、sporosity, voids, laps, cracks, segregations, and similar objectionable defects. The etching can be performed after the consolidationor final heat treatment. If the sample fails to meet the requirements of this section, all parts from that compact shall be rejected.8. Dimensions and Permissible Vari
44、ations8.1 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 and condition, and shall be free from injurious imperfections.10. Sampling10.1 LotA lot is defined as follows:10.1.1 A lot for chemical
45、 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 powderblend consolidated in the same hot isostatic press using the same pressure, temperature, and time parameters and heat-treated inthe sam
46、e 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 samples shall be taken after powder blending or during subsequent processing.10.2.1.1 Check Analysis shall be wholly the responsibility
47、of the purchaser.from one part from each lot of parts. Thecomposition of the sample shall conform to the chemical requirements prescribed in Table 1.TABLE 2 Product Analysis ToleranceElementTolerance, Over the Maximum Limit or Under theMinimum Limit, %UNS N06625 UNS N08367 UNS N06600 UNS N06690 UNS
48、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 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
49、. 0.10 0.15 .Cobalt (when specified) 0.03 . . . .Columbium (Nb) 0.15 . . . 0.20Aluminum 0.05 . . . 0.10Titanium 0.03 . . . 0.05Nitrogen . 0.01 . . .Copper . 0.04 0.03 0.03 0.03TABLE 3 Mechanical Property RequirementsAlloy Condition Tensile Strength Yield Strength Elongation,min%ksi MPa ksi MPAN06600 Annealed 85 585 35 240 30N06625 Grade 1 (annealed) 120 827 60 414 30N06625 Grade 2 (solution annealed) 110 758 50 345 30N06690 Annealed 85 585 35 240 30N07718 Solution annealed +precipitation hardened185 1275 150 1034 6N07718 Solution a
