1、Designation: B853 12B853 16Standard Specification forPowder Metallurgy (PM) Boron Stainless Steel StructuralComponents1This standard is issued under the fixed designation B853; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the ye
2、ar of last revision. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon () indicates an editorial change since the last revision or reapproval.1. Scope*1.1 This specification covers stainless steel powder metallurgy (PM) structural components with a 7.7-g/cm3 minimum
3、 densitythat are fabricated from prealloyed powder consisting primarily of iron, chromium, nickel, molybdenum, and boron2 and areintended for use in corrosive service.1.2 With the exception of the values for density and the mass used to determine density, for which the use of the gram per cubiccenti
4、metre (g/cm3) and gram (g) units is the longstanding industry practice, the values in inch-pound units are to be regarded asstandard. The values given in parentheses are mathematical conversions to SI units that are provided for information only and arenot considered standard.2. Referenced Documents
5、2.1 ASTM Standards:3A262 Practices for Detecting Susceptibility to Intergranular Attack in Austenitic Stainless SteelsB117 Practice for Operating Salt Spray (Fog) ApparatusB243 Terminology of Powder MetallurgyB311 Test Method for Density of Powder Metallurgy (PM) Materials Containing Less Than Two P
6、ercent PorosityE8 Test Methods for Tension Testing of Metallic MaterialsE354 Test Methods for Chemical Analysis of High-Temperature, Electrical, Magnetic, and Other Similar Iron, Nickel, andCobalt AlloysE572 Test Method for Analysis of Stainless and Alloy Steels by Wavelength Dispersive X-Ray Fluore
7、scence SpectrometryE1019 Test Methods for Determination of Carbon, Sulfur, Nitrogen, and Oxygen in Steel, Iron, Nickel, and Cobalt Alloys byVarious Combustion and Fusion TechniquesE1086 Test Method for Analysis of Austenitic Stainless Steel by Spark Atomic Emission SpectrometryG48 Test Methods for P
8、itting and Crevice Corrosion Resistance of Stainless Steels and RelatedAlloys by Use of Ferric ChlorideSolution3. Terminology3.1 DefinitionsDefinitions of powder metallurgy terms can be found in Terminology B243.Additional descriptive informationis in the Related Material section of Volume 02.05 of
9、the Annual Book of ASTM Standards.4. Ordering Information4.1 Orders for components under this specification shall include the following information:4.1.1 Dimensions (see Section 9),4.1.2 Chemical composition (see Section 6, 10.1, and Table 1),4.1.3 Density (see Section 7),4.1.4 Mechanical properties
10、 (see Section 8, 10.2, and Table 2),4.1.5 Certification (see Section 13),1 This specification is under the jurisdiction of ASTM Committee B09 on Metal Powders and Metal Powder Products and is the direct responsibility of SubcommitteeB09.11 on Near Full Density Powder Metallurgy Materials.Current edi
11、tion approved Nov. 15, 2012Oct. 1, 2016. Published November 2012October 2016. Originally approved in 1994. Last previous edition approved in 20072012as B853 07.B853 12. DOI: 10.1520/B0853-12.10.1520/B0853-16.2 U.S. Patents 3980444, 4014680, 4032336.3 For referencedASTM standards, visit theASTM websi
12、te, 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 standard an indication
13、 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 ASTM is to be conside
14、red 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 States14.1.6 Reference to the standard.5. Materials and Manufacture5.1 Structural components shall be
15、made by cold pressing and sintering prealloyed powder.5.2 The sintering temperature is dependent on the chemical composition of the powder.6. Chemical Composition6.1 The material shall conform to the composition limits specified in Table 1.6.2 Chemical analysis should be made in accordance with Test
16、 Methods E354, E572, E1019, and E1086.7. Physical Properties7.1 Density:7.1.1 The sintered density shall be 7.7 g/cm3 minimum.7.1.2 Density shall be determined in accordance with Test Method B311.8. Mechanical Properties8.1 The purchaser and manufacturerproducer shall agree upon the method to be use
17、d to verify the typical yield or tensilestrength in the finished parts. The preferred method for verifying the tensile or yield strength is for the manufacturerproducer andpurchaser to agree upon a qualification test to be performed on the actual part. The specific test should be determined aftercon
18、sideration of the function of the part. An example would be measuring the force needed to break teeth off a gear, using aprescribed fixture.8.2 The tensile properties of the material may also be verified using specifically prepared bars, compacted from the same mixedpowder lot as the purchased parts
19、, and sintered along with the parts.8.3 Typical tensile values for 0.2 % offset yield strength, ultimate strength, and percent elongation in 1-in. gage length foras-sintered standard flat unmachined tension test specimens for powder metallurgy (PM) products (see Test Methods E8) are inTable 2.9. Dim
20、ensions and Tolerances9.1 Dimensions and tolerances of the structural components shall be indicated on drawings accompanying the purchase orderor contract.10. Sampling10.1 Chemical AnalysisIf required by purchase agreement, at least one sample for chemical analysis shall be taken from eachlot. A rep
21、resentative sample of chips may be obtained by dry-milling, drilling, or crushing at least two pieces without lubricationusing clean dry tools.TABLE 1 Chemical Composition RequirementsElement Composition Limits, Mass %Carbon 0.05 maxManganese 2.00 maxPhosphorus 0.03 maxSulfur 0.03 maxSilicon 1.0 max
22、Chromium 22.0 to 24.0Nickel 17.0 to 19.0Molybdenum 3.0 to 4.0Boron 0.20 to 0.50Nitrogen 0.10 maxIronA balanceA Iron shall be determined arithmetically by difference.TABLE 2 Typical Mechanical PropertiesA0.2 % Offset yield strength 33 000 psi (228 MPa)Ultimate tensile strength 76 000 psi (520 MPa)Elo
23、ngation in one inch 23 %Apparent Hardness 75 HRBA Determined on a cold-pressed and vacuum-sintered standard flat unmachinedtest specimen for powder metallurgy (PM) products (see Test Methods E8).B853 16210.2 Mechanical TestingIf required by the purchase agreement, the manufacturerproducer and purcha
24、ser shall mutually agreeon the number of specimens for mechanical testing from each lot. This number shall be based on good practice of statistical qualitycontrol.11. Inspection11.1 Unless otherwise specified, inspection of components supplied on contract shall be made by the purchaser.12. Rejection
25、 and Rehearing12.1 Components that fail to conform to the requirements of this specification may be rejected. Rejection shall be reported tothe producer or supplier promptly and in writing. In case of dissatisfaction with test results, the producer or supplier may makea claim for rehearing.13. Certi
26、fication13.1 When specified in the purchase order or contract, a producers certification of compliance document shall be reported tothe purchaser, verifying that the components manufactured were sampled, tested, and inspected in accordance with thisspecification and have met the requirements. When s
27、pecified in the purchase order or contract, a report of test results shall befurnished.13.2 Certification by an independent third party indicating conformance to the requirements of this specification may beconsidered upon the request of the purchaser.13.3 The purchase order or contract shall specif
28、y whether or not the certification includes a report of chemical analysis.14. Keywords14.1 cold pressing; density; powder metallurgy (PM); prealloyed powder; sintering; stainless steel; structural (PM) componentsSUPPLEMENTARY REQUIREMENTSThe following supplementary requirements shall apply only when
29、 specified by the purchaser in theinquiry, contract, or order. The supplier and the purchaser should agree upon a minimum number ofhours survival for the requested corrosion test.S1. Intergranular Corrosion TestS1.1 When specified, material shall pass intergranular corrosion tests conducted by the m
30、anufacturer in accordance withPractices A262.S2. Salt Spray (Fog) TestingS2.1 When specified, material shall pass the salt spray corrosion test conducted by the manufacturer in accordance with PracticeB117.S3. Pitting and Crevice Corrosion TestS3.1 When specified, material shall pass pitting and cre
31、vice corrosion tests conducted by the manufacturer in accordance withTest Methods G48.B853 163SUMMARY OF CHANGESCommittee B09 has identified the location of selected changes to this standard since the last issue(B853-07)-12) that may impact the use of this standard.(1) Changed the statement on units
32、 in Section 1.2. “manufacturer” to “producer” throughout the document.(2) Removed the reference to IEEE/ASTMDeleted “or supplier” in 12.1 SI 10 from Section 2.1. in two places.(3) Deleted the word “representative“ from section 10.2.ASTM International takes no position respecting the validity of any
33、patent rights asserted in connection with any item mentionedin 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 revis
34、ion at any time by the responsible technical committee and 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 co
35、mments will receive careful consideration at a meeting of 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 copyrigh
36、ted 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 the ASTM website(www.astm.org). Permission rights to photocopy the standard may also be secured from the Copyright Clearance Center, 222Rosewood Drive, Danvers, MA 01923, Tel: (978) 646-2600; http:/ 164
