1、Designation: B853 07 B853 12Standard 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 y
2、ear 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 minimu
3、m 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 density values, for which g/cm3 the values for density and the mass used to determine density, forwhich th
4、e use of the gram per cubic centimetre (g/cm3) and gram (g) units is the longstanding industry standard,practice, the valuesstated in inch-pound units are to be regarded as the standard. The SI values given in parentheses are converted in accordancewithmathematical conversions to SI IEEE/ASTM SI 10
5、and are for information only.units that are provided for information onlyand are not considered standard.2. Referenced Documents2.1 ASTM Standards:3A262 Practices for Detecting Susceptibility to Intergranular Attack in Austenitic Stainless SteelsB117 Practice for Operating Salt Spray (Fog) Apparatus
6、B243 Terminology of Powder MetallurgyB311 Test Method for Density of Powder Metallurgy (PM) Materials Containing Less Than Two Percent PorosityE8 Test Methods for Tension Testing of Metallic MaterialsE354 Test Methods for Chemical Analysis of High-Temperature, Electrical, Magnetic, and Other Similar
7、 Iron, Nickel, andCobalt AlloysE572 Test Method for Analysis of Stainless and Alloy Steels by X-ray Fluorescence SpectrometryE1019 Test Methods for Determination of Carbon, Sulfur, Nitrogen, and Oxygen in Steel, Iron, Nickel, and Cobalt Alloys byVarious Combustion and Fusion TechniquesE1086 Test Met
8、hod for Atomic Emission Vacuum Spectrometric Analysis of Stainless Steel by Point-to-Plane ExcitationTechniqueG48 Test Methods for Pitting and Crevice Corrosion Resistance of Stainless Steels and Related Alloys by Use of Ferric ChlorideSolutionIEEE/ASTM SI 10 American National Standard for Metric Pr
9、actice3. 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 the Annual Book of ASTM Standards.4. Ordering Information4.1 Orders for components under this specificat
10、ion 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),1 This specification is under the jurisdiction of ASTM Committee B09 on Metal Powders and Metal Powder Products and is the direct responsibility of SubcommitteeB
11、09.11 on Near Full Density Powder Metallurgy Materials.Current edition approved Oct. 1, 2007Nov. 15, 2012. Published November 2007November 2012. Originally approved in 1994. Last previous edition approved in 20022007as B853 02.B853 07. DOI: 10.1520/B0853-07.10.1520/B0853-12.2 U.S. Patents 3980444, 4
12、014680, 4032336.3 For referenced ASTM standards, visit the ASTM website, www.astm.org, or contact ASTM 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
13、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 changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only th
14、e 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 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States14.1.3 Density (see Sectio
15、n 7),4.1.4 Mechanical properties (see Section 8, 10.2, and Table 2),4.1.5 Certification (see Section 13),4.1.6 Reference to the standard.5. Materials and Manufacture5.1 Structural components shall be made by cold pressing and sintering prealloyed powder.5.2 The sintering temperature is dependent on
16、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 Methods E354, E572, E1019, and E1086.7. Physical Properties7.1 Density:7.1.1 The sintered density s
17、hall 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 manufacturer shall agree upon the method to be used to verify the typical yield or tensile strength in thefinished parts. The preferred method for verifying t
18、he tensile or yield strength is for the manufacturer and purchaser to agree upona qualification test to be performed on the actual part. The specific test should be determined after consideration of the functionof the part. An example would be measuring the force needed to break teeth off a gear, us
19、ing a prescribed 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, and sintered along with the parts.8.3 Typical tensile values for 0.2 % offset yield strength, ultimate strength,
20、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. Dimensions and Tolerances9.1 Dimensions and tolerances of the structural components shall be indicated on drawings acc
21、ompanying the purchase orderor contract.TABLE 1 Chemical Composition RequirementsElement Composition Limits,WeightMass %Carbon 0.05 maxManganese 2.00 maxPhosphorus 0.03 maxSulfur 0.03 maxSilicon 1.0 maxChromium 22.0 to 24.0Nickel 17.0 to 19.0Molybdenum 3.0 to 4.0Boron 0.20 to 0.50Nitrogen 0.10 maxIr
22、onA 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)Elongation in one inch 23 %Apparent Hardness 75 HRBA Determined on a cold-pressed and vacuum-sintered
23、 standard flat unmachinedtest specimen for powder metallurgy (PM) products (see Test Methods E8).B853 12210. Sampling10.1 Chemical AnalysisIf required by purchase agreement, at least one sample for chemical analysis shall be taken from eachlot. A representative sample of chips may be obtained by dry
24、-milling, drilling, or crushing at least two pieces without lubricationusing clean dry tools.10.2 Mechanical TestingIf required by the purchase agreement, the manufacturer and purchaser shall mutually agree on therepresentative number of specimens for mechanical testing from each lot. This number sh
25、all be based on good practice of statisticalquality control.11. Inspection11.1 Unless otherwise specified, inspection of components supplied on contract shall be made by the purchaser.12. Rejection and Rehearing12.1 Components that fail to conform to the requirements of this specification may be rej
26、ected. 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. Certification13.1 When specified in the purchase order or contract, a producers certification of compliance
27、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 specified in the purchase order or contract, a report of test results shall befurnished.13.2 Certificati
28、on 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 specify whether or not the certification includes a report of chemical analysis.14. Keywords14.1 cold pressin
29、g; density; powder metallurgy (PM); prealloyed powder; sintering; stainless steel; structural (PM) componentsSUPPLEMENTARY REQUIREMENTSThe following supplementary requirements shall apply only when specified by the purchaser in theinquiry, contract, or order. The supplier and the purchaser should ag
30、ree 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 manufacturer in accordance withPractices A262.S2. Salt Spray (Fog) TestingS2.1 When specified, material
31、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 crevice corrosion tests conducted by the manufacturer in accordance withTest Methods G48.B853 123SUMMARY O
32、F CHANGESCommittee B09 has identified the location of selected changes to this standard since the last issue(B853-02)-07) that may impact the use of this standard.(1) Corrected the title of Test Method E572 in Section 2.1.(1) Changed the statement on units in Section 1.2.(2) Removed the reference to
33、 IEEE/ASTM SI 10 from Section 2.1.(3) Deleted the word “representative“ from section 10.2.(2) Deleted the reference to a specific figure number in Test Methods E8 in Section 8.3.(3) Deleted the definition of “lot” in Section 10.1 as we currently have an approved definition in Terminology B243.ASTM I
34、nternational takes no position respecting the validity of any 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 entir
35、ely their own responsibility.This standard is subject to revision 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
36、should be addressed to ASTM International Headquarters. Your comments 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
37、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 the ASTM website(www.astm.org). Permission rights to photocopy the standard may also be secured from the ASTM website (www.astm.org/COPYRIGHT/).B853 124
