1、Designation: B 296 03 (Reapproved 2008)Standard Practice forTemper Designations of Magnesium Alloys, Cast andWrought1This standard is issued under the fixed designation B 296; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the yea
2、r of 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. Scope1.1 This practice covers a system for designating the tem-pers of magnesium alloys, cast and wrought. The designatio
3、nsused in ASTM specifications under the jurisdiction of Com-mittee B07 for magnesium alloy castings and wrought productsconform to this practice.22. Basis of Codification2.1 The designations for temper are used for all forms ofmagnesium and magnesium-alloy products except ingots andare based on the
4、sequence of basic treatments used to producethe various tempers.2.2 The temper designation follows the alloy designation,the two being separated by a dash.2.3 Basic temper designations consist of letters. Subdivi-sions of the basic tempers, where required, are indicated by adigit or digits following
5、 the letter. These designate specificsequences of basic treatments, but only operations recognizedas significantly influencing the characteristics of the productare indicated. Should some other variation of the same se-quence of basic operations be applied to the same alloy,resulting in different ch
6、aracteristics, then additional digits areadded to the designation.NOTE 1In material specifications containing reference to two or moretempers of the same alloy which result in identical mechanical properties,the distinction between the tempers should be covered in suitableexplanatory notes.2.4 The t
7、emper designations and the subdivisions are fullydefined and explained in Table 1. A brief outline for quickreference is given in Table 2.1This practice is under the jurisdiction of the ASTM Committee B07 on LightMetals and Alloys and is the direct responsibility of Subcommittee B07.04 onMagnesium A
8、lloy Cast and Wrought Products.Current edition approved March 1, 2008. Published March 2008. Originallyapproved in 1954. Last previous edition approved in 2003 as B 296 03.2The designations used in ASTM Committee B07 specifications for aluminum-alloy wrought and cast products conform to the American
9、 National StandardH 35.1/H 35.1(M).1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.TABLE 1 Temper DesignationsF As FabricatedApplies to products that acquire some temper from shaping processes not having special control over the amou
10、nt of strain hardening orthermal treatment.O Annealed, RecrystallizedApplies to the softest temper of wrought products.H Strain Hardened (Wrought Products Only)Applies to products that have their strength increased by strain hardening with or without supplementarythermal treatments to produce partia
11、l softening. Two or more digits always follow the H.Subdivisions of the 9H9 Temper:H1 Strain Hardened OnlyApplies to products that are strain hardened to obtain the desired mechanical properties without supplementary thermaltreatment. The number following this designation indicates the final degree
12、of strain hardening.H2 Strain Hardened and Then Partially AnnealedApplies to products that are strain hardened more than the desired final amount and then reduced instrength to the desired final amount by partial annealing.The number following this designation indicates the final degree of strain ha
13、rdening remaining after the product has been partially annealed.H3 Strain Hardened and Then StabilizedApplies to products that are strain hardened and then stabilized by a low temperature heating to slightly lowertheir strength and increase ductility. This designation applies only to alloys which, u
14、nless stabilized, gradually age soften at room temperature.The number following this designation indicates the degree of strain hardening remaining after the product has been strain hardened a specificamount and then stabilized.Subdivisions of the 9H1,99H2,9 and 9H39 Tempers:The digit following the
15、designations 9H1,99H2,9 and 9H39 indicates the final degree of strain hardening. Tempers between 0 (annealed) and 8 (full hard)are designated by numerals 1 through 7. Material having a strength about midway between that of the 0 temper and that of the 8 temper is designated by thenumeral 4 (half har
16、d); between 0 and 4 by the numeral 2 (quarter hard); between 4 and 8 by the numeral 6 (three-quarter hard); and so forth.The third digit, when used, indicates a variation of a two-digit H temper. It is used when the degree of control of temper or the mechanical propertiesare different from but close
17、 to those for the two-digit H temper to which it is added. Numerals 1 through 9 may be arbitrarily assigned for an alloy and productto indicate a specific degree of control of temper or specified mechanical property limits.W Solution Heat-TreatedAn unstable temper applicable only to alloys that spon
18、taneously age at room temperature after solution heat treatment. Thisdesignation is specific only when the period of natural aging is indicated: for example, W12 hour.T Thermally Treated to Produce Stable Tempers Other Than F, O, or HApplies to products that are thermally treated, with or without su
19、pplementarystrain hardening, to produce stable tempers. One or more digits always follow the T. Numerals 1 through 10 have been assigned to indicate specificsequence of basic treatments as follows:Subdivisions of the “T” Tempers:T1 Cooled From an Elevated Temperature Shaping Process and Naturally Ag
20、ed to a Substantially Stable ConditionApplies to products for which the rateof cooling from an elevated temperature shaping process, such as casting, or extruding, is such that their strength is increased by room temperatureaging.T3 Solution Heat Treated and Then Cold WorkedApplies to products that
21、are cold worked to improve strength, or in which the effect of cold work inflattening and straightening is recognized in applicable mechanical properties.T4 Solution Heat Treated and Naturally Aged to a Substantially Stable ConditionApplies to products that are not cold worked after solution heattre
22、atment, or in which the effect of cold work in flattening or straightening may not be recognized in applicable mechanical properties.T5 Cooled From an Elevated-Temperature Shaping Process and Then Artificially AgedApplies to products that are cooled from an elevated temperatureshaping process, such
23、as casting or extruding, and then artificially aged to improve mechanical properties or dimensional stability or both.T6 Solution Heat Treated and Then Artificially AgedApplies to products that are not cold worked after solution heat treatment, or in which the effect ofcold work is flattening or str
24、aightening may not be recognized in applicable mechanical properties.T7 Solution Heat Treated and Then StabilizedApplies to products that are stabilized to carry them beyond the point of maximum strength to providecontrol of some special characteristics.T8 Solution Heat Treated, Cold Worked, and The
25、n Artificially AgedApplies to products that are cold worked to improve strength, or in which the effect ofcold work in flattening or straightening is recognized in applicable mechanical properties.T9 Solution Heat Treated, Artificially Aged, and Then Cold WorkedApplies to products that are cold work
26、ed to improve strength.T10 Cooled From an Elevated Temperature Shaping Process, Artificially Aged, and Then Cold WorkedApplies to products that are artificially aged aftercooling from an elevated temperature shaping process, such as casting or extruding, and then cold worked to further improve stren
27、gth.A period of natural aging at room temperature may occur between or after the operations listed for tempers T3 through T10. Control of this period isexercised when it is metallurgically important.Additional digits may be added to designations T1 through T10 to indicate a variation in treatment th
28、at significantly alters the characteristics of theproduct.B 296 03 (2008)2ASTM International 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
29、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 time by the responsible technical committee and must be reviewed every five years andif not revised, either reapproved or withdrawn. Your comments
30、are invited either for revision of this standard or for additional standardsand 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 r
31、eceived 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 International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959,United States. Individual reprints (single or multiple copies
32、) 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).TABLE 2 Basic Temper Designations and SubdivisionsF As fabricated.O Annealed, recrystallized (wrought produ
33、cts only).H Strain hardened.Subdivisions of the“ H” Temper:H1, plus one or more digits. .Strain hardened only.H2, plus one or more digits. .Strain hardened and then partially annealed.H3, plus one or more digits. .Strain hardened and then stabilized.W Solution heat treated. Unstable temper.T Thermal
34、ly treated to produce stable tempers other than F, O, or H.Subdivisions of the “T” Temper:T1 Cooled and naturally aged.T3 Solution heat treated and then cold worked.T4 Solution heat treated.T5 Cooled and artificially aged.T6 Solution heat treated and artificially aged.T7 Solution heat treated and stabilized.T8 Solution heat treated, cold worked, and artificially aged.T9 Solution heat treated, artificially aged, and cold worked.T10 Cooled, artificially aged, and cold worked.B 296 03 (2008)3
