文档介绍：Designation: A 897/A 897M – 06Standard Speci?cation forAustempered Ductile Iron Castings1This standard is issued under the ?xed designation A897/A 897M; the number immediately following the designation indicates the yearof original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last superscript epsilon (e) indicates an editorial change since the last revision or . This speci?cation covers ductile iron castings that aresubsequently heat treated by an austempering process asde?ned The application of the austempering heat treatmentextends the range of properties achievable in ductile No precise quantitative relationship can be stated be-tween the properties of the iron in various locations of the samecasting or between the properties of castings and those of a testspecimen cast from the same iron (seeAppendix X1). How-ever, austempering heat treatment will tend to diminish anydifferences in mechanical The production of castings, machining (if required), andthe austempering heat treatments may be performed by differ-ent manufacturers, as covered in Section15. The purchasershould establish by contract agreement, at the time of ordering,the responsibility of the various parties for meeting thespeci?cation The values stated in either inch-pound or SI units are tobe regarded separately as standard. Within the text, the SI unitsare shown in brackets [ ]. The values stated in each system arenot exact equivalents; therefore, each system shall be usedindependently of the other. Combining values from the twosystems may result in nonconformance with the speci?. Referenced Standards:2A 247Test Method for Evaluating the Microstructure ofGraphite in Iron CastingsA 370Test Methods and De?nitions for Mechanical Testingof Steel ProductsA 732/A 732MSpeci?cation for Castings, Investment, Car-bon and Low All