ASTM_B_853_-_16.pdf

Designation:B85316Standard 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 year 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 metal-lurgy(PM)structural components with a 7.7-g/cm3minimumdensity 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 the values for density and themass used to determine density,for which the use of the gramper cubic centimetre(g/cm3)and gram(g)units is the long-standing industry practice,the values in inch-pound units are tobe regarded as standard.The values given in parentheses aremathematical conversions to SI units that are provided forinformation only and are not considered standard.2.Referenced Documents2.1 ASTM Standards:3A262 Practices for Detecting Susceptibility to IntergranularAttack 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 Percent PorosityE8 Test Methods for Tension Testing of Metallic MaterialsE354 Test Methods for Chemical Analysis of High-Temperature,Electrical,Magnetic,and Other Similar Iron,Nickel,and Cobalt AlloysE572 Test Method for Analysis of Stainless and Alloy Steelsby Wavelength Dispersive X-Ray Fluorescence Spectrom-etryE1019 Test Methods for Determination of Carbon,Sulfur,Nitrogen,and Oxygen in Steel,Iron,Nickel,and CobaltAlloys by Various Combustion and Fusion TechniquesE1086 Test Method forAnalysis ofAustenitic Stainless Steelby Spark Atomic Emission SpectrometryG48 Test Methods for Pitting and Crevice Corrosion Resis-tance of Stainless Steels and Related Alloys by Use ofFerric Chloride Solution3.Terminology3.1 DefinitionsDefinitions of powder metallurgy termscan be found in Terminology B243.Additional descriptiveinformation is in the Related Material section of Volume 02.05of the Annual Book of ASTM Standards.4.Ordering 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 6,10.1,and Table1),4.1.3 Density(see Section 7),4.1.4 Mechanical properties(see Section 8,10.2,and Table2),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 pressingand sintering prealloyed powder.5.2 The sintering temperature is dependent on the chemicalcomposition of the powder.6.Chemical Composition6.1 The material shall conform to the composition limitsspecified in Table 1.6.2 Chemical analysis should be made in accordance withTest Methods E354,E572,E1019,and E1086.7.Physical Properties7.1 Density:7.1.1 The sintered density shall be 7.7 g/cm3minimum.7.1.2 Density shall be determined in accordance with TestMethod B311.1This specification is under the jurisdiction of ASTM Committee 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.1,2016.Published October 2016.Originallyapproved in 1994.Last previous edition approved in 2012 as B853 12.DOI:10.1520/B0853-16.2U.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.*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 States1 8.Mechanical Properties8.1 The purchaser and producer shall agree upon the methodto be used to verify the typical yield or tensile strength in thefinished parts.The preferred method for verifying the tensile oryield strength is for the producer and purchaser to agree upona qualification test to be performed on the actual part.Thespecific test should be determined after consideration of thefunction of the part.An example would be measuring the forceneeded to break teeth off a gear,using a prescribed fixture.8.2 The tensile properties of the material may also beverified using specifically prepared bars,compacted from thesame mixed powder lot as the purchased 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 m