1、Designation: A801 09Standard Specification forWrought Iron-Cobalt High Magnetic Saturation Alloys (UNSR30005 and K92650)1This standard is issued under the fixed designation A801; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the
2、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. Scope1.1 This specification covers two wrought iron-cobalt alloytypes for use in magnetic components requiring high per
3、me-ability at and above 15 kG (1.5 T) or high magnetic saturation.The specific alloy types covered are:Alloy Type UNS Nominal Composition1 R30005 49 % Co, 49 % Fe, 2 % V2 K92650 27 % Co, 0.50 % Cr, balance Fe1.1.1 This specification also covers material supplied by aproducer in the form and physical
4、 condition suitable forfabrication into parts that will later be given final heattreatment to achieve the desired magnetic characteristics and,where required, mechanical properties. It covers materialsupplied in form of forging billets, hot-rolled products (that is,bar, plate, and strip), cold-finis
5、hed bars, and cold-rolled strip.1.2 This specification does not cover parts produced bycasting or by powder metallurgical techniques.1.3 The values stated in customary (cgs-emu and inch-pound) units are to be regarded as standard. The values givenin parentheses are mathematical conversions to SI uni
6、ts, whichare provided for information only and are not consideredstandard.2. Referenced Documents2.1 ASTM Standards:2A34/A34M Practice for Sampling and Procurement Testingof Magnetic MaterialsA340 Terminology of Symbols and Definitions Relating toMagnetic TestingA341/A341M Test Method for Direct Cur
7、rent MagneticProperties of Materials Using D-C Permeameters and theBallistic Test MethodsA596/A596M Test Method for Direct-Current MagneticProperties of Materials Using the Ballistic Method andRing SpecimensA773/A773M Test Method for dc Magnetic Properties ofMaterials Using Ring and Permeameter Proc
8、edures withdc Electronic HysteresigraphsE1019 Test Methods for Determination of Carbon, Sulfur,Nitrogen, and Oxygen in Steel, Iron, Nickel, and CobaltAlloys by Various Combustion and Fusion Techniques3. Terminology3.1 The terms and symbols used in this specification aredefined in Terminology A340.4.
9、 Ordering Information4.1 Purchase orders for material under this specificationshall include the following information:4.1.1 Reference to this specification and year of issue/revision,4.1.2 Alloy type,4.1.3 Form and conditions (see Section 6),4.1.4 Dimensions and tolerances, (tolerances other thantho
10、se in Section 9 must be stated as mutually agreed uponbetween the producer and the user),4.1.5 Quantity (weight or number of pieces),4.1.6 Magnetic property requirements if other than shown inthis specification (see Section 7),4.1.7 Certification of analysis or magnetic quality evalua-tion, or both,
11、 if needed,4.1.8 Marking and packaging, and4.1.9 Exceptions to this specification or special require-ments.4.2 End UseWhen possible, the user should specifywhether the material will be machined, blanked into flat pieces,wound into a core, punched into laminations, or photo-etched.5. Chemical Composi
12、tion5.1 The material shall conform to the requirements pre-scribed in Table 1. Since magnetic and possibly mechanicalproperties are of primary importance to the user, analysis1This specification is under the jurisdiction of ASTM Committee A06 onMagnetic Properties and is the direct responsibility of
13、 Subcommittee A06.02 onMaterial Specifications.Current edition approved Nov. 1, 2009. Published December 2009. Originallyapproved in 1999. Last previous edition approved in 2004 as A80104. DOI:10.1520/A0801-09.2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Custo
14、mer Service at serviceastm.org. For Annual Book of ASTMStandards volume information, refer to the standards Document Summary page onthe ASTM website.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.variations are permitted subject to
15、mutual agreement betweenthe producer and user.5.2 Determination of metallic constituents shall be by amethod acceptable to both producer and user. Analysis ofcarbon, nitrogen, sulfur, and oxygen shall be done in accor-dance with Test Method E1019.6. Form and Condition6.1 These materials are capable
16、of being produced in formsand conditions described suitable for further manufacture intospecific magnetic components. The desired form and conditionshould be discussed with the producer to ensure receiving thecorrect product. Available forms and conditions are:6.1.1 Forging BilletHot-worked and surf
17、ace prepared bygrinding.6.1.2 Hot-Rolled Bar, Plate, and StripHot-rolled, hot-rolled and acid cleaned, and hot-rolled and mechanicallycleaned.6.1.3 Cold-Finished BarsCenterless ground.6.1.4 Cold-Rolled Strip.7. Magnetic Property Requirements7.1 GeneralMaterial supplied under terms of this speci-fica
18、tion shall be tested only by use of dc test methods. ACmagnetic property measurements and requirements for thinstrip (thickness less than 0.020 in. (0.5 mm) are subject tomutual agreement between the producer and user.7.2 Test SpecimenWhenever possible, test specimen sizeand shape shall conform to P
19、ractice A34/A34M. Shapes suchas stacked ring laminations, solid rings, and tape wound coresare the preferred test specimens. If, however, it is impossible toprepare a preferred test specimen shape from the item, thespecimen shape used shall be mutually agreed upon betweenthe producer and the user.7.
20、3 DensityThe assumed densities of these materials formagnetic test purposes are:Alloy Type UNS Density g/cm3(kg/m3)1 R30005 8.12 (8120)2 K92650 7.95 (7950)7.4 Test Specimen Heat TreatmentThe heat treatmentapplied to the test specimen shall be in accordance with aprocedure mutually agreed upon betwee
21、n the producer and theuser or a procedure recommended by the producer to achievethe magnetic properties described in this specification (seeAppendix X1).7.5 Test MethodsMagnetic testing shall be conducted inaccordance with Test Method A341/A341M, Test MethodA596/A596M, or Test Method A773/A773M. Tes
22、ting shall beconducted at the magnetic field strengths as shown in Table 2for the alloy type.7.6 RequirementsThe material shall meet the require-ments listed in Table 2.8. Typical Physical and Mechanical Properties8.1 For typical physical and mechanical properties, seeAppendix X2.9. Dimensions and T
23、olerances9.1 Forging Billet and Hot-Rolled Bar, Plate, and StripAsagreed upon between the producer and user.TABLE 1 Chemical Requirements (Weight Percent)Alloy 1UNS R30005Alloy 2UNS K92650Carbon, max 0.025 0.025Manganese, max 0.15 0.35Silicon, max 0.15 0.35Phosphorus, max 0.015 0.015Sulfur, max 0.01
24、0 0.015Chromium, max 0.15 0.75Nickel, max 0.25 0.75Cobalt 47.50 to 49.50 26.50 to 28.50Vanadium 1.75 to 2.10 0.35 maxIron remainder remainderTABLE 2 DC Magnetic Property RequirementsAlloy Type 1 (UNS R30005)Minimum Magnetic Flux Density kG, (T)for Magnetic Field Strengths ofProduct Form Size10 Oe(80
25、0 A/m)20 Oe(1.6 kA/m)50 Oe(4 kA/m)100 Oe(8 kA/m)Cold-rolled Strip all 20.0 (2.00) 21.0 (2.10) 22.0 (2.20) 22.5 (2.25)Bar 0.500 to 1 in. (12.7 to 25.4 mm) 16.0 (1.60) 18.0 (1.80) 20.0 (2.00) 21.5 (2.15)Bar over 1 in. (25.4 mm) 15.0 (1.50) 17.5 (1.75) 19.5 (1.95) 21.5 (2.15)Forging Billet, Hot Rolled
26、Plate, Hot Rolled Strip all 15.0 (1.50) 17.5 (1.75) 19.5 (1.95) 21.5 (2.15)Alloy Type 2 (UNS K92650)Minimum Magnetic Flux Density kG, (T)for Magnetic Field Strengths of:Product Form Size50 Oe(4 kA/m)100 Oe(8 kA/m)150 Oe(12 kA/m)200 Oe(16 kA/m)Cold-Rolled Strip all 18.7 (1.87) 20.3 (2.03) 21.2 (2.12)
27、 21.7 (2.17)Bar up to 0.250 in. (6.35 mm) 18.7 (1.87) 20.3 (2.03) 21.2 (2.12) 21.7 (2.17)Bar over 0.250 in. (6.35 mm) 11.0 (1.10) 17.5 (1.75) 19.5 (1.95) 21.0 (2.10)Forging Billet, Hot Rolled Plate, Hot Rolled Strip all 11.0 (1.10) 17.5 (1.75) 19.5 (1.95) 21.0 (2.10)A801 0929.2 Cold-Finished BarsSee
28、 Table 3.9.3 Cold-Rolled StripSee Tables 4 and 5.10. Rejection and Rehearing10.1 Material that fails to conform to the requirements ofthis specification may be rejected by the user. The rejectionshall be reported to the producer promptly and in writing. Therejected material shall be correctly identi
29、fied, adequately pro-tected, and set aside for eventual return to the producer or foranother disposition.10.2 The producer may make claim for a rehearing. In thisevent, the user shall make samples that are representative of therejected material available to the producer for evaluation.11. Certificat
30、ion11.1 When specified in the purchase order or contract, theuser shall be furnished certification that samples representingeach lot have been either tested or inspected as directed in thisspecification and the requirements have been met. Whenspecified in the purchase order or contract, a report of
31、the testresults shall be furnished.12. Packaging and Package Marking12.1 Packaging shall be subject to agreement between theproducer and user.12.2 The material as furnished under this specification shallbe identified by the name or symbol of the producer by meltnumber and size. Each heat supplied on
32、 a given order must beidentified separately.13. Keywords13.1 core loss; iron-cobalt alloy; magnetic flux density;magnetic saturationAPPENDIXES(Nonmandatory Information)X1. HEAT TREATMENT OF IRON-COBALT ALLOYSX1.1 Most mechanical and magnetic properties of thesealloys are dependent on the grain size
33、after heat treatment.Producers generally evaluate magnetic property capability of amelt or an item by heat treating the magnetic test specimenrepresenting the lot, using their recommended procedure.X1.2 General heat-treatment procedure guidelines are asfollows:X1.2.1 Place material in a sealed (leak
34、-free) retort orequivalent.X1.2.2 Use a nonoxidizing, noncarburizing atmospheresuch as dry hydrogen, argon, or equivalent, or a vacuum.Appropriate safety precautions must be taken when workingwith highly flammable atmospheres.X1.2.3 Heat to the annealing temperature and hold for 4 h.Alloy 1 is typic
35、ally heat treated at temperatures between 845and 865C. For some applications, annealing may be per-formed at temperatures as low as 715C. The annealingtemperature of Alloy 1 should never exceed 875C as the alloyis prone to exhibit poor magnetic properties if heated abovethis temperature. Exceptions
36、to this high-temperature limit, ifnecessary, should be discussed with the producer. Alloy 2 isalso typically heat treated between 845 and 865C for the bestmagnetic performance. Alloy 2 may also be heat treated attemperatures as high as 975C without the same cautionsconcerning Alloy 1. For both alloy
37、s, the use of a relatively lowheat treatment temperature or reduced heat treatment timeprovides higher strength but with a sacrifice in magneticperformance. The higher heat treatment temperatures, withinthe limits stated, generally provide the best magnetic perfor-mance but lower mechanical strength
38、.X1.2.4 Cool in the same atmosphere at a rate of 100 to200C/h to 500C or lower and at any rate thereafter to atemperature of at least 200C or lower.X1.3 There can be applications requiring lower heat-treating temperatures and shorter heat treatment times toachieve certain mechanical properties requi
39、red by the end use.In these cases, the user must advise the producer of theTABLE 3 Dimensional Tolerances for Ground BarsSpecified Diameter, in. (mm) Variation in Diameter, 6in. (6mm)Under 0.500 to 0.3125 (12.7 to 7.94) 0.0025 (0.064)Under 1.000 to 0.500 (25.4 to 12.7) 0.0025 (0.064)Under 1.500 to 1
40、.000 (38.1 to 25.4) 0.0030 (0.076)4.000 to 1.500 (101.6 to 38.1) 0.0050 (0.13)TABLE 4 Thickness Tolerances for Cold-Rolled StripASpecified Thickness, in. (mm)Permissible Variations in Thickness,6in. (6mm)Width #6in.(152 mm)Width 6 in.(152 mm)0.000 20 to 0.0040 (0.051 to 0.10) 0.0002 (0.0051) 0.0003
41、(0.0076)0.0041 to 0.0060 (0.10 to 0.15) 0.0003 (0.0076) 0.0004 (0.010)0.0061 to 0.0100 (0.16 to 0.254) 0.0005 (0.013) 0.000 75 (0.019)0.0101 to 0.0140 (0.257 to 0.356) 0.0010 (0.025) 0.0015 (0.038)0.0141 to 0.0250 (0.358 to 0.635) 0.0015 (0.038) 0.0020 (0.051)0.0251 to 0.0600 (0.638 to 1.52) 0.0020
42、(0.051) 0.0030 (0.076)AMeasurements shall be made at least 0.375 in. (9.5 mm) from the edges of thecold rolled coil.TABLE 5 Coil Width Tolerances for Cold-Rolled StripSpecified Thickness,in. (mm)Permissible Variations in Width, 6in.(6mm)Width #6in.(152 mm)Width 6 in.(152 mm)0.002 to 0.060 (0.05 to 1
43、.52) 0.005 (0.13) 0.010 (0.25)A801 093mechanical and magnetic property requirements. These re-quirements are subject to mutual agreement between theproducer and user.X2. TYPICAL PHYSICAL, MAGNETIC, AND MECHANICAL PROPERTIESX2.1 Typical physical, DC and AC magnetic properties,and mechanical propertie
44、s are shown in Tables X2.1-X2.4,respectively. Many of these properties depend on the particularproduct form and heat treatment used. The user should consultwith the producer if such properties are of importance to theapplication. The data are provided for information only and arenot requirements in
45、this specification and need not be mea-sured.All properties are for room temperature unless otherwisenoted.TABLE X2.1 Typical Physical PropertiesAlloy Type 1UNS R30005Alloy Type 2UNS K92650Density, g/cm3(kg/m3) 8.12 (8120) 7.95 (7950)Electrical resistivity, V -cm(V - mm) 40 (400) 19 (190)Curie tempe
46、rature, C 940 925Saturation magnetostriction, 10660 36Saturation induction, kG (T) 23.8 (2.38) 23.6 (2.36)Modulus of elasticity, psi (GPa) 30 3 106(207) 24 3 106(166)Thermal conductivity, cal/cm s C (W/mK) 0.0712 (29.8) 0.131 (54.8)Thermal expansivity, 106/C(20 to 100C) 9.2 9.8(20 to 200C) 9.5 10.1(
47、20 to 300C) 9.8 10.3(20 to 400C) 10.1 10.6(20 to 500C) 10.4 10.9(20 to 600C) 10.5 11.2(20 to 700C) 10.8 . . .(20 to 800C) 11.3 . . .TABLE X2.2 Typical DC Magnetic PropertiesAlloy Type IUNS R30005Alloy Type 1UNS R30005Alloy Type 2UNS K92650Alloy Type 2UNS K92650Product form Strip Round Bar Strip Roun
48、d BarProduct size, in. (mm) 0.014 (0.35) 0.531 (13.5) 0.014 (0.35) 0.500 (12.7)Heat treatment temperature, C 845 845 845 925Magnetic Field Strength, Oe (A/m) Flux Density, kG (T)2 (160) 13.5 (1.35) 2.5 (0.25) 5.0 (0.50) . . .5 (400) 19.5 (1.95) . . . . . . . . .10 (800) 21.0 (2.10) 17.0 (1.70) 13.5
49、(1.35) 11.0 (1.10)20 (1600) 22.0 (2.20) 20.0 (2.00) 17.0 (1.70) 14.0 (1.40)50 (4000) 22.3 (2.23) 22.0 (2.20) 19.2 (1.92) 18.5 (1.85)75 (6000) 22.5 (2.25) 22.5 (2.25) 21.0 (2.10) 19.5 (1.95)100 (8000) 23.0 (2.30) 23.0 (2.30) 21.5 (2.15) 20.5 (2.05)Coercive field strength, Oe (A/m)A0.90 (72) 2.0 (160) 1.7 (140) 3.0 (240)Residual induction, kG (T)A14.5 (1.45) 10.0 (1.00) 8.5 (0.85) 6.0 (0.60)ACoercive field strength and residual induction measured from a maximum magnetic field strength of 100 Oe (8000 A/m).A801 094ASTM International takes no
