1、Designation: A801 09A801 14Standard 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 revisio
2、n, 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. Scope1.1 This specification covers two wrought iron-cobalt alloy types for use in magnetic components requiring
3、high permeabilityat 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 a producer in the form and
4、physical condition suitable for fabricationinto parts that will later be given final heat treatment to achieve the desired magnetic characteristics and, where required,mechanical properties. It covers material supplied in form of forging billets, hot-rolled products (that is, bar, plate, and strip),
5、cold-finished bars, and cold-rolled strip.1.2 This specification does not cover parts produced by casting 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 given inparentheses are mathematical conversion
6、s to SI units, which are provided for information only and are not considered standard.1.4 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibilityof the user of this standard to establish appropriate safety and health practices
7、and determine the applicability of regulatorylimitations prior to use.2. Referenced Documents2.1 ASTM Standards:2A34/A34M Practice for Sampling and Procurement Testing of Magnetic MaterialsA340 Terminology of Symbols and Definitions Relating to Magnetic TestingA341/A341M Test Method for Direct Curre
8、nt Magnetic Properties of Materials Using D-C Permeameters and the Ballistic TestMethodsA596/A596M Test Method for Direct-Current Magnetic Properties of Materials Using the Ballistic Method and Ring SpecimensA773/A773M Test Method for dc Magnetic Properties of Materials Using Ring and Permeameter Pr
9、ocedures with dc ElectronicHysteresigraphsE1019 Test Methods for Determination of Carbon, Sulfur, Nitrogen, and Oxygen in Steel, Iron, Nickel, and Cobalt Alloys byVarious Combustion and Fusion Techniques3. Terminology3.1 The terms and symbols used in this specification are defined in Terminology A34
10、0.4. Ordering Information4.1 Purchase orders for material under this specification shall include the following information:4.1.1 Reference to this specification and year of issue/revision,1 This specification is under the jurisdiction of ASTM Committee A06 on Magnetic Properties and is the direct re
11、sponsibility of Subcommittee A06.02 on MaterialSpecifications.Current edition approved Nov. 1, 2009May 1, 2014. Published December 2009May 2014. Originally approved in 1999. Last previous edition approved in 20042009 asA80104.09. DOI: 10.1520/A0801-09.10.1520/A0801-14.2 For referencedASTM standards,
12、 visit theASTM website, www.astm.org, or contactASTM Customer Service at serviceastm.org. For Annual Book of ASTM Standardsvolume information, refer to the standards Document Summary page on the ASTM website.This document is not an ASTM standard and is intended only to provide the user of an ASTM st
13、andard an indication of what changes have been made to the previous version. Becauseit may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current versionof the standard as published by A
14、STM is to be considered the official document.Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States14.1.2 Alloy type,4.1.3 Form and conditions (see Section 6),4.1.4 Dimensions and tolerances, (tolerances other than those in Section 9 must b
15、e stated as mutually agreed upon between theproducer and the user),4.1.5 Quantity (weight or number of pieces),4.1.6 Magnetic property requirements if other than shown in this specification (see Section 7),4.1.7 Certification of analysis or magnetic quality evaluation, or both, if needed,4.1.8 Marki
16、ng and packaging, and4.1.9 Exceptions to this specification or special requirements.4.2 End UseWhen possible, the user should specify whether the material will be machined, blanked into flat pieces, woundinto a core, punched into laminations, or photo-etched.5. Chemical Composition5.1 The material s
17、hall conform to the requirements prescribed in Table 1. Since magnetic and possibly mechanical propertiesare of primary importance to the user, analysis variations are permitted subject to mutual agreement between the producer and user.5.2 Determination of metallic constituents shall be by a method
18、acceptable to both producer and user. Analysis of carbon,nitrogen, sulfur, and oxygen shall be done in accordance with Test Method E1019.6. Form and Condition6.1 These materials are capable of being produced in forms and conditions described suitable for further manufacture intospecific magnetic com
19、ponents. The desired form and condition should be discussed with the producer to ensure receiving thecorrect product. Available forms and conditions are:6.1.1 Forging BilletHot-worked and surface prepared by grinding.6.1.2 Hot-Rolled Bar, Plate, and StripHot-rolled, hot-rolled and acid cleaned, and
20、hot-rolled and mechanically cleaned.6.1.3 Cold-Finished BarsCenterless ground.6.1.4 Cold-Rolled Strip.7. Magnetic Property Requirements7.1 GeneralMaterial supplied under terms of this specification shall be tested only by use of dc test methods. AC magneticproperty measurements and requirements for
21、thin strip (thickness less than 0.020 in. (0.5 mm) are subject to mutual agreementbetween the producer and user.7.2 Test SpecimenWhenever possible, test specimen size and shape shall conform to Practice A34/A34M. Shapes such asstacked ring laminations, solid rings, and tape wound cores are the prefe
22、rred test specimens. If, however, it is impossible to preparea preferred test specimen shape from the item, the specimen shape used shall be mutually agreed upon between the producer andthe user.7.3 DensityThe assumed densities of these materials for magnetic test purposes are:Alloy Type UNS Density
23、 g/cm3 (kg/m3)1 R30005 8.12 (8120)2 K92650 7.95 (7950)7.4 Test Specimen Heat TreatmentThe heat treatment applied to the test specimen shall be in accordance with a proceduremutually agreed upon between the producer and the user or a procedure recommended by the producer to achieve the magneticproper
24、ties described in this specification (see Appendix X1).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 0.75Co
25、balt 47.50 to 49.50 26.50 to 28.50Vanadium 1.75 to 2.10 0.35 maxIron remainder remainderA801 1427.5 Test MethodsMagnetic testing shall be conducted in accordance with Test Method A341/A341M, Test MethodA596/A596M, or Test Method A773/A773M. Testing shall be conducted at the magnetic field strengths
26、as shown in Table 2 forthe alloy type.7.6 RequirementsThe material shall meet the requirements listed in Table 2.8. Typical Physical and Mechanical Properties8.1 For typical physical and mechanical properties, see Appendix X2.9. Dimensions and Tolerances9.1 Forging Billet and Hot-Rolled Bar, Plate,
27、and StripAs agreed upon 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 Material that fails to conform to the requirements of this specification may be rejected by the user. The rejection shall bereported to the
28、producer promptly and in writing. The rejected material shall be correctly identified, adequately protected, and setaside for eventual return to the producer or for another disposition.10.2 The producer may make claim for a rehearing. In this event, the user shall make samples that are representativ
29、e of therejected material available to the producer for evaluation.11. Certification11.1 When specified in the purchase order or contract, the user shall be furnished certification that samples representing eachlot have been either tested or inspected as directed in this specification and the requir
30、ements have been met. When specified in thepurchase order or contract, a report of the test results shall be furnished.12. Packaging and Package Marking12.1 Packaging shall be subject to agreement between the producer and user.12.2 The material as furnished under this specification shall be identifi
31、ed by the name or symbol of the producer by melt numberand size. Each heat supplied on a given order must be identified separately.13. Keywords13.1 core loss; iron-cobalt alloy; magnetic flux density; magnetic saturationTABLE 2 DC Magnetic Property RequirementsAlloy Type 1 (UNS R30005)Minimum Magnet
32、ic Flux Density kG, (T)for Magnetic Field Strengths ofProduct Form Size10 Oe(800 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 to25.4 mm) 16.0 (1.60) 18.0 (1.80) 20.0 (2.00) 21.5 (2.15)Bar over 1 in. (25.4
33、mm) 15.0 (1.50) 17.5 (1.75) 19.5 (1.95) 21.5 (2.15)Forging Billet, Hot Rolled Plate, HotRolled Stripall 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 k
34、A/m)200 Oe(16 kA/m)Cold-Rolled Strip all 18.7 (1.87) 20.3 (2.03) 21.2 (2.12) 21.7 (2.17)Bar up to 0.250 in. (6.35mm) 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, HotRolled Stripall 11.0 (1
35、.10) 17.5 (1.75) 19.5 (1.95) 21.0 (2.10)A801 143APPENDIXES(Nonmandatory Information)X1. HEAT TREATMENT OF IRON-COBALT ALLOYSX1.1 Most mechanical and magnetic properties of these alloys are dependent on the grain size after heat treatment. Producersgenerally evaluate magnetic property capability of a
36、 melt or an item by heat treating the magnetic test specimen representing thelot, using their recommended procedure.X1.2 General heat-treatment procedure guidelines are as follows:X1.2.1 Place material in a sealed (leak-free) retort or equivalent.X1.2.2 Use a nonoxidizing, noncarburizing atmosphere
37、such as dry hydrogen, argon, or equivalent, or a vacuum. Appropriatesafety precautions must be taken when working with highly flammable atmospheres.X1.2.3 Heat to the annealing temperature and hold for 4 h. Alloy 1 is typically heat treated at temperatures between 845 and865C. For some applications,
38、 annealing may be performed at temperatures as low as 715C. The annealing temperature of Alloy1 should never exceed 875C as the alloy is prone to exhibit poor magnetic properties if heated above this temperature. Exceptionsto this high-temperature limit, if necessary, should be discussed with the pr
39、oducer. Alloy 2 is also typically heat treated between845 and 865C for the best magnetic performance. Alloy 2 may also be heat treated at temperatures as high as 975C without thesame cautions concerningAlloy 1. For both alloys, the use of a relatively low heat treatment temperature or reduced heat t
40、reatmenttime provides higher strength but with a sacrifice in magnetic performance. The higher heat treatment temperatures, within thelimits stated, generally provide the best magnetic performance but lower mechanical strength.X1.2.4 Cool in the same atmosphere at a rate of 100 to 200C/h to 500C or
41、lower and at any rate thereafter to a temperature ofat least 200C or lower.TABLE 3 Dimensional Tolerances for Ground BarsSpecified Diameter, in. (mm) Variation in Diameter, in. (mm)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 1.0
42、00 (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,in. (mm)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.
43、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 (0.
44、051) 0.0030 (0.076)A Measurements 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, in.(mm)Width #6 in.(152 mm)Width 6 in.(152 mm)0.002 to 0.060 (0.05 to 1.52
45、) 0.005 (0.13) 0.010 (0.25)A801 144X1.3 There can be applications requiring lower heat-treating temperatures and shorter heat treatment times to achieve certainmechanical properties required by the end use. In these cases, the user must advise the producer of the mechanical and magneticproperty requ
46、irements. These requirements are subject to mutual agreement between the producer and user.X2. TYPICAL PHYSICAL, MAGNETIC, AND MECHANICAL PROPERTIESX2.1 Typical physical, DC and AC magnetic properties, and mechanical properties are shown in Tables X2.1-X2.4, respectively.Many of these properties dep
47、end on the particular product form and heat treatment used. The user should consult with the producerif such properties are of importance to the application. The data are provided for information only and are not requirements in thisspecification and need not be measured. All properties are for room
48、 temperature unless otherwise noted.TABLE X2.1 Typical Physical PropertiesAlloy Type 1UNS R30005Alloy Type 2UNS K92650Density, g/cm3 (kg/m3) 8.12 (8120) 7.95 (7950)Electrical resistivity, - cm ( - mm) 40 (400) 19 (190)Curie temperature, C 940 925Saturation magnetostriction, 106 60 36Saturation induc
49、tion, kG (T) 23.8 (2.38) 23.6 (2.36)Modulus of elasticity, psi (GPa) 30 106 (207) 24 106 (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(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 Round
