1、Designation: A 801 04Standard Specification forWrought Iron-Cobalt High Magnetic Saturation Alloys (UNSR30005 and K92650)1This standard is issued under the fixed designation A 801; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, th
2、e year 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 specification covers two wrought iron-cobalt alloytypes currently manufactured and supplied commercial
3、ly foruse in magnetic components requiring high permeability at andabove 15 kG (1.5 T) or high magnetic saturation. The specificalloy 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 materi
4、al supplied by aproducer in the form and physical 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 pro
5、ducts, cold-finished bars, and 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 S
6、I units whichare provided for information only and are not consideredstandard.2. Referenced Documents2.1 ASTM Standards:2A 34/A 34M Practice for Sampling and Procurement Test-ing of Magnetic MaterialsA 340 Terminology of Symbols and Definitions Relating toMagnetic TestingA 341/A 341M Test Method for
7、 Direct Current MagneticProperties of Materials Using dc Permeameters and theBallistic Test MethodsA 596/A 596M Test Method for Direct-Current MagneticProperties of Materials Using the Ballistic Method andRing SpecimensA 773/A 773M Test Method for dc Magnetic Properties ofMaterials Using Ring and Pe
8、rmeameter Procedures withdc Electronic HysteresigraphsE 1019 Test Methods for Determination of Carbon, Sulfur,Nitrogen, and Oxygen in Steel and in Iron, Nickel, andCobalt Alloys3. Terminology3.1 The terms and symbols used in this specification aredefined in Terminology A 340.4. Ordering Information4
9、.1 Purchase orders for material under this specificationshall include such of the following information to adequatelydescribe the desired product.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 tolerance
10、s, (tolerances other thanthose 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 q
11、uality evalua-tion, or both, if needed,4.1.8 Marking and packaging, and4.1.9 Exceptions to this specification or special require-ments.1This specification is under the jurisdiction of ASTM Committee A06 onMagnetic Properties and is the direct responsibility of Subcommittee A06.02 onMaterial Specific
12、ations.Current edition approved Oct. 1, 2004. Published October 2004. Originallyapproved in 1999. Last previous edition approved in 1999 as A 801/A 801M 99.2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at serviceastm.org. For Annual Book of AST
13、MStandards 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.4.2 End UseWhenever practicable, the user shouldspecify whether the material will be machi
14、ned, blanked intoflat pieces, wound into a core, punched into laminations, orphoto-etched.5. Chemical Composition5.1 The material shall conform to the requirements pre-scribed in Table 1. Since magnetic and possibly mechanicalproperties are of primary importance, analysis variations arepermitted sub
15、ject to mutual agreement between the producerand 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 E 1019.6. Form and Condition6.1 These materials are
16、 capable 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
17、 and surface prepared bygrinding.6.1.2 Hot-Rolled ProductHot-rolled, hot-rolled and acidcleaned, and hot-rolled and mechanically cleaned.6.1.3 Cold-Finished BarsCenterless ground.6.1.4 StripCold-rolled.7. Magnetic Property Requirements7.1 GeneralMaterial supplied under terms of this speci-fication s
18、hall be tested only by use of dc test methods. ACmagnetic property measurements and requirements are subjectto mutual agreement between the producer and user.7.2 Test SpecimenWhenever possible, test specimen sizeand shape shall conform to Practice A 34/A 34M. Shapes suchas stacked ring laminations,
19、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.7.3 DensityThe assumed densities of these materials formagne
20、tic 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 between the producer and theuser or a procedure recommended by t
21、he producer to achievethe magnetic properties described in this specification (seeAppendix X1).7.5 Test MethodsMagnetic testing shall be conducted inaccordance with Test Method A 341/A 341M, Test MethodA 596/A 596M, or Test Method A 773/A 773M. Testing shallbe conducted at the magnetic field strengt
22、hs as shown in Table2 for 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 Tolerances9.1 Forging Billet and Hot-Rolled ProductsA
23、s agreedupon between the producer and user.9.2 Cold-Finished BarsSee Table 3.9.3 Cold-Rolled StripSee Tables 4 and 5.10. Rejection and Rehearing10.1 Where any material fails to meet the requirements ofthis specification, the material shall be handled in accordancewith the procedure mutually agreed u
24、pon by the producer andthe 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 0.010 0.015Chromium, max 0.15 0.75Nickel, max 0.25 0.75Cobalt 47.50 to 49.50 26.
25、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 ofProductForm Size10 Oe(800 A/m)20 Oe(1.6 kA/m)50 Oe(4 kA/m)100 Oe(8 kA/m)Strip all 20.0 (2.00) 21.0 (2
26、.10) 22.0 (2.20) 22.5 (2.25)Bar0.500 to 1in. (12.7 to25.4 mm)16.0 (1.60) 18.0 (1.80) 20.0 (2.00) 21.5 (2.15)Bar-billetover 1 in.(25.4 mm)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:ProductForm Size50 Oe(
27、4 kA/m)100 Oe(8 kA/m)150 Oe(12 kA/m)200 Oe(16 kA/m)Strip all 18.7 (1.87) 20.3 (2.03) 21.2 (2.12) 21.7 (2.17)Barup to0.250 in.(6.35 mm)18.7 (1.87) 20.3 (2.03) 21.2 (2.12) 21.7 (2.17)Bar-billetover 0.250in. (6.35mm)11.0 (1.10) 17.5 (1.75) 19.5 (1.95) 21.0 (2.10)A80104211. Certification11.1 When specif
28、ied 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 the testresults sha
29、ll 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 a given order must
30、 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 after heat treatmen
31、t.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-free) retort orequ
32、ivalent.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 typically heat treated a
33、t 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 to this high-temper
34、ature 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 alloys, the use of a rel
35、atively 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.X1.2.4 Cool in the
36、 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 required by the end use.
37、In these cases, the user must advise the producer of themechanical and magnetic property requirements. These re-quirements are subject to mutual agreement between theproducer and user.TABLE 3 Dimensional Tolerances for Ground BarsSpecified Diameter, in. (mm) Variation in Diameter, 6in. (6mm)Under 0.
38、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 1.000 (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 Thickne
39、ss,6in. (6mm)Width #6 in.(152 mm)Width 6 in.(152 mm)0.000 20 to 0.0040 (0.051 to 0.10) 0.0002 (0.0051) 0.0003 (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
40、(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 (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.
41、 (mm)Permissible Variations in Width, 6in.(6mm)Width #6 in.(152 mm)Width 6 in.(152 mm)0.002 to 0.060 (0.05 to 1.52) 0.005 (0.13) 0.010 (0.25)A801043X2. TYPICAL PHYSICAL, MAGNETIC, AND MECHANICAL PROPERTIESX2.1 Typical physical, DC and AC magnetic properties,and mechanical properties are shown in Tab
42、les 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 this specification
43、 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 temperature, C 940 925
44、Saturation 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 100 C) 9.2 9.8(20 to 200 C) 9.5 10.1(20 to 300 C) 9.
45、8 10.3(20 to 400 C) 10.1 10.6(20 to 500 C) 10.4 10.9(20 to 600 C) 10.5 11.2(20 to 700 C) 10.8 . . .(20 to 800 C) 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 Round BarProd
46、uct 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 (1.35) 11
47、.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
48、) 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).A801044ASTM International takes no position respecting the validity of any patent rights asserted in
49、 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 time 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 Intern
