1、Designation: B 853 07Standard Specification forPowder Metallurgy (PM) Boron Stainless Steel StructuralComponents1This standard is issued under the fixed designation B 853; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the year of
2、 last revision. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon (e) indicates an editorial change since the last revision or reapproval.1. Scope*1.1 This specification covers stainless steel powder metal-lurgy (PM) structural components with a 7.7-g/cm3minimumdens
3、ity that are fabricated from prealloyed powder consistingprimarily of iron, chromium, nickel, molybdenum, and boron2and are intended for use in corrosive service.1.2 With the exception of density values, for which g/cm3 isthe industry standard, the values stated in inch-pound units areto be regarded
4、 as the standard. The SI values given inparentheses are converted in accordance with IEEE/ASTM SI10 and are for information only.2. Referenced Documents2.1 ASTM Standards:3A 262 Practices for Detecting Susceptibility to Intergranu-lar Attack in Austenitic Stainless SteelsB117 Practice for Operating
5、Salt Spray (Fog) ApparatusB 243 Terminology of Powder MetallurgyB311 Test Method for Density Determination for PowderMetallurgy (P/M) Materials Containing Less Than TwoPercent PorosityE8 Test Methods for Tension Testing of Metallic MaterialsE 354 Test Methods for Chemical Analysis of High-Temperatur
6、e, Electrical, Magnetic, and Other Similar Iron,Nickel, and Cobalt AlloysE 572 Test Method for Analysis of Stainless and AlloySteels by X-ray Fluorescence SpectrometryE 1019 Test Methods for Determination of Carbon, Sulfur,Nitrogen, and Oxygen in Steel and in Iron, Nickel, andCobalt AlloysE 1086 Tes
7、t Method for Optical Emission Vacuum Spectro-metric Analysis of Stainless Steel by Point-to-Plane Exci-tation TechniqueG48 Test Methods for Pitting and Crevice Corrosion Re-sistance of Stainless Steels and Related Alloys by Use ofFerric Chloride SolutionIEEE/ASTM SI 10 American National Standard for
8、 Use ofthe International System of Units (SI): The Modern MetricSystem3. Terminology3.1 Definitions Definitions of powder metallurgy termscan be found in Terminology B 243. Additional descriptiveinformation is in the Related Material section of Volume 02.05of the Annual Book of ASTM Standards.4. Ord
9、ering Information4.1 Orders for components under this specification shallinclude the following information:4.1.1 Dimensions (see Section 9),4.1.2 Chemical composition (see Section 6 and Table 1),4.1.3 Density (see Section 7),4.1.4 Mechanical properties (see Section 8 and Table 2),4.1.5 Certification
10、 (see Section 13),4.1.6 Reference to the standard.5. Materials and Manufacture5.1 Structural components shall be made by cold pressingand sintering prealloyed powder.5.2 The sintering temperature is dependent on the chemicalcomposition of the powder.6. Chemical Composition6.1 The material shall conf
11、orm to the composition limitsspecified in Table 1.6.2 Chemical analysis should be made in accordance withTest Methods E 354, E 572, E 1019, and E 1086.7. Physical Properties7.1 Density:7.1.1 The sintered density shall be 7.7 g/cm3minimum.1This specification is under the jurisdiction of ASTM Committe
12、e B09 on MetalPowders and Metal Powder Products and is the direct responsibility of Subcom-mittee B09.11 on Near Full Density Powder Metallurgy Materials.Current edition approved Oct. 1, 2007. Published November 2007. Originallyapproved in 1994. Last previous edition approved in 2002 as B 853 02.2U.
13、S. Patents 3980444, 4014680, 4032336.3For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at serviceastm.org. For Annual Book of ASTMStandards volume information, refer to the standards Document Summary page onthe ASTM website.1*A Summary of Changes s
14、ection appears at the end of this standard.Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.7.1.2 Density shall be determined in accordance with TestMethod B311.8. Mechanical Properties8.1 The purchaser and manufacturer shall agree upo
15、n themethod to be used to verify the typical yield or tensile strengthin the finished parts. The preferred method for verifying thetensile or yield strength is for the manufacturer and purchaserto agree upon a qualification test to be performed on the actualpart. The specific test should be determin
16、ed after considerationof the function of the part.An example would be measuring theforce needed to break teeth off a gear, using a prescribedfixture.8.2 The tensile properties of the material may also beverified using specifically prepared bars, compacted from thesame mixed powder lot as the purchas
17、ed parts, and sinteredalong with the parts.8.3 Typical tensile values for 0.2 % offset yield strength,ultimate strength, and percent elongation in 1-in. gage lengthfor as-sintered standard flat unmachined tension test specimensfor powder metallurgy (PM) products (see Test Methods E8)are in Table 2.9
18、. Dimensions and Tolerances9.1 Dimensions and tolerances of the structural componentsshall be indicated on drawings accompanying the purchaseorder or contract.10. Sampling10.1 Chemical AnalysisIf required by purchase agree-ment, at least one sample for chemical analysis shall be takenfrom each lot.
19、A representative sample of chips may beobtained by dry-milling, drilling, or crushing at least twopieces without lubrication using clean dry tools.10.2 Mechanical TestingIf required by the purchaseagreement, the manufacturer and purchaser shall mutuallyagree on the representative number of specimens
20、 for mechani-cal testing from each lot. This number shall be based on goodpractice of statistical quality control.11. Inspection11.1 Unless otherwise specified, inspection of componentssupplied on contract shall be made by the purchaser.12. Rejection and Rehearing12.1 Components that fail to conform
21、 to the requirements ofthis specification may be rejected. Rejection shall be reportedto the producer or supplier promptly and in writing. In case ofdissatisfaction with test results, the producer or supplier maymake a claim for rehearing.13. Certification13.1 When specified in the purchase order or
22、 contract, aproducers certification of compliance document shall bereported to the purchaser, verifying that the componentsmanufactured were sampled, tested, and inspected in accor-dance with this specification and have met the requirements.When specified in the purchase order or contract, a report
23、oftest results shall be furnished.13.2 Certification by an independent third party indicatingconformance to the requirements of this specification may beconsidered upon the request of the purchaser.13.3 The purchase order or contract shall specify whether ornot the certification includes a report of
24、 chemical analysis.14. Keywords14.1 cold pressing; density; powder metallurgy (PM); pre-alloyed powder; sintering; stainless steel; structural (PM)componentsTABLE 1 Chemical Composition RequirementsElement Composition Limits, Weight %Carbon 0.05 maxManganese 2.00 maxPhosphorus 0.03 maxSulfur 0.03 ma
25、xSilicon 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 maxIronAbalanceAIron 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 ps
26、i (520 MPa)Elongation in one inch 23 %Apparent Hardness 75 HRBADetermined on a cold-pressed and vacuum-sintered standard flat unmachinedtest specimen for powder metallurgy (PM) products (see Test Methods E8).B853072SUPPLEMENTARY REQUIREMENTSThe following supplementary requirements shall apply only w
27、hen 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 cor-rosion tests conducted by t
28、he manufacturer in accordance withPractices A 262.S2. Salt Spray (Fog) TestingS2.1 When specified, material shall pass the salt spraycorrosion test conducted by the manufacturer in accordancewith Practice B117.S3. Pitting and Crevice Corrosion TestS3.1 When specified, material shall pass pitting and
29、 crevicecorrosion tests conducted by the manufacturer in accordancewith Test Methods G48.SUMMARY OF CHANGESCommittee B09 has identified the location of selected changes to this standard since the last issue (B 853-02)that may impact the use of this standard.(1) Corrected the title of Test Method E 5
30、72 in Section 2.1.(2) Deleted the reference to a specific figure number in TestMethods E8in Section 8.3.(3) Deleted the definition of “lot” in Section 10.1 as wecurrently have an approved definition in Terminology B 243.ASTM International takes no position respecting the validity of any patent right
31、s 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 revision at any t
32、ime 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 comments will
33、 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 copyrighted by ASTM
34、 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).B853073
