1、Designation: B834 13B834 15Standard Specification forPressure Consolidated Powder Metallurgy Iron-Nickel-Chromium-Molybdenum (UNS N08367) and N08367), Nickel-Chromium-Molybdenum-Columbium (Nb) (UNS N06625)N06625), Nickel-Chromium-Iron Alloys (UNS N06600 andN06690), and Nickel-Chromium-Iron-Columbium
2、-Molybdenum (UNS N07718) 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 in
3、dicates the year of 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) (UN
4、S N06625) N06625), nickel-chromium-iron alloys (UNS N06600 andN06690), and nickel-chromium-iron-columbium (Nb)-molybdenum (UNS N07718) alloy pipe flanges, fittings, valves, and partsintended for general corrosion or heat-resisting service.1.1.1 UNS N06625 products are furnished in two grades of diff
5、erent 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) whenresistance to creep and rupture is required.1.2 UNS N08367
6、products are furnished in the 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 s
7、tated in inch-pound units are 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
8、, 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 userof this standard to become familiar with all hazards including those identified in the appropriate Material Safety Data Sheet(MSDS)(SDS) f
9、or this product/material as provided by the manufacturer, to establish appropriate safety and health practices, andto determine the applicability of regulatory limitations prior to use.2. Referenced Documents2.1 ASTM Standards:2E8 Test Methods for Tension Testing of Metallic MaterialsE29 Practice fo
10、r Using Significant Digits in Test Data to Determine Conformance with SpecificationsE1473 Test Methods for Chemical Analysis of Nickel, Cobalt, and High-Temperature AlloysG28 Test Methods for Detecting Susceptibility to Intergranular Corrosion in Wrought, Nickel-Rich, Chromium-Bearing Alloys1 This s
11、pecification is under the jurisdiction ofASTM Committee B02 on Nonferrous Metals andAlloys and is the direct responsibility of Subcommittee B02.07 on RefinedNickel and Cobalt and Their Alloys.Current edition approved Oct. 1, 2013Oct. 1, 2015. Published October 2013October 2015. Originally approved i
12、n 1993. Last previous edition approved in 20092013 asB834 95 (2009).B834 13. DOI: 10.1520/B0834-13.10.1520/B0834-15.2 For referencedASTM standards, visit theASTM website, www.astm.org, or contactASTM Customer Service at serviceastm.org. For Annual Book of ASTM Standardsvolume information, refer to t
13、he standardsstandards 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 standard an indication of what changes have been made to the previous version. Becauseit may not be technically possible to adequately depict all
14、changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current versionof the 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
15、 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States1G48 Test Methods for Pitting and Crevice Corrosion Resistance of Stainless Steels and RelatedAlloys by Use of Ferric ChlorideSolution2.2 ManufacturersManufacturers Standardization Society of the Valve and Fittings Indus
16、try Standard:3SP-25 Standard Marking System for Valves, Fittings, Flanges, and Unions2.3 ASME/ANSI Standard:4ASME/ANSI B16.5 Pipe Flanges and Flanged Fittings3. Terminology3.1 Definitions of Terms Specific to This Standard:3.1.1 can, nthe container used to encapsulate the powder during the pressure
17、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 produced.3.1.4 part, na single ite
18、m 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. Ordering Information4.1 Orders
19、 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 year of issue,4.1.6 Inspectio
20、n (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 powder blend into a can, evacuati
21、ng 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 part is fully dense. The compa
22、ctmay 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 ensurehomogeneity.5.1.4 When specified on t
23、he 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 microstructure shall be agreed upon by t
24、he manufacturer and the purchaser.5.2 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, the t
25、emperature shall be 1600F (871C) minimum.or5.2.1.2 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 1800F (1093C)minimum.5.2.2 A
26、lloy 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.3 Available from Manufacturers Standardization Society of the Valve and Fittings Industry (MS
27、S), 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.B834 1525.2.3 Alloy N06600 shall be supplied in the annealed condition. The temp
28、erature 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 + preci
29、pitation 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
30、until 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 prod
31、uct (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
32、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 ordered under these specifications for working pressures other than those listed in the Ameri
33、canNational 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 f
34、inish machined by others.The fabricator of the finished part is not required to pressure test parts that are designed to be pressure containing only afterTABLE 1 Chemical RequirementsElement Composition,%UNS N06625 UNS N08367Carbon, max 0.10 0.030Manganese, max 0.50 2.00Silicon, max 0.50 1.00Phospho
35、rus, 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 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 0.25Coppe
36、r . 0.75 maxTABLE 1 Chemical RequirementsElement 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 . . 0.015Sulfur, max 0.015 0.030 0.015 0.015 0.
37、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 remainderACobalt (when specified) 1.00 max . . . 1.0 maxC
38、olumbium (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 Element shall be determined arithmetically by difference.B Columbium (Nb) + tantalum.B834 153assembly by weld
39、ing into a larger structure. However, the manufacturer of such parts is responsible as 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 for one sample from each production lot. The sample shall
40、besuspended from a scale and weighed in air and water using Archimedes principle. The equipment used shall have accuracysufficient for the test. The measured value shall not be less than 0.3047 lb/in.3 (8.452 gm/cm3) for UNS N06625 and N06625,0.2904 lb/in.3 (8.055 gm/cm3) for UNS N08367. N08367, 0.3
41、029 lb/in.3 (8.385 gm/cm3) for UNS N06600, 0.2930 lb/in.3) (8.111gm/cm3) for UNS N06690, and 0.2940 lb/in.3 (8.139 gm/cm3) for 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 i
42、nmicro-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 sample f
43、ails 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.TABLE 2 Product Analysis ToleranceElement Tolerance, Over the Maximum Limit or Under the
44、 Minimum 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
45、 .Nitrogen . 0.01Copper . 0.04TABLE 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 0.03 0.03 0.03
46、Phosphorus, 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 . . . 0.10Titanium 0.03 .
47、. . 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
48、30N06690 Annealed 85 585 35 240 30N07718 Solution annealed +precipitation hardened185 1275 150 1034 6N08367 Solution annealed 95 655 45 310 30B834 1549. Workmanship, Finish, and Appearance9.1 The parts shall be uniform in quality and condition, and shall be free from injurious imperfections.10. Samp
49、ling10.1 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 powderblend 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 sampl
