1、Designation: B 603 07Standard Specification forDrawn or Rolled Iron-Chromium-Aluminum Alloys forElectrical Heating Elements1This standard is issued under the fixed designation B 603; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision,
2、the 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 annealed, drawn, or rolledshapes for electrical heating and resistance purposes
3、 of alloysconsisting mainly of iron, chromium, and aluminum as detailedin Table 1.1.2 The values stated in inch-pound units are to be regardedas the standard. The values given in parentheses are forinformation only.1.3 This standard does not purport to address all of thesafety concerns, if any, asso
4、ciated with its use. It is theresponsibility of the user of this standard to become familiarwith all hazards including those identified in the appropriateMaterial Safety Data Sheet (MSDS) for this product/materialas provided by the manufacturer, to establish appropriatesafety and health practices, a
5、nd determine the applicability ofregulatory limitations prior to use.2. Referenced Documents2.1 ASTM Standards:2A 751 Test Methods, Practices, and Terminology forChemical Analysis of Steel ProductsB63 Test Method for Resistivity of Metallically Conduct-ing Resistance and Contact MaterialsB70 Test Me
6、thod for Change of Resistance With Tempera-ture of Metallic Materials for Electrical HeatingB78 Test Method of Accelerated Life of Iron-Chromium-Aluminum Alloys for Electrical Heating3. Terminology3.1 Definitions:3.1.1 lot size, nthe lot size for determining compliancewith the requirements of this s
7、pecification shall be one heat.4. Significance and Use4.1 This specification on iron-chromium-aluminum alloyscontains the requirements for chemistry, electrical resistance,mechanical properties, resistance change with temperature, andpackaging.4.2 Determination of properties is not required for rout
8、ineacceptance of material unless specified by the purchaser.5. Chemical Requirements5.1 The alloys shall conform to the requirements as tochemical composition prescribed in Table 1.5.2 Samples for Chemical AnalysisSpecimens for chemi-cal analysis may be taken either from the melt or from a sampleof
9、finished material that is representative of the lot.5.3 Chemical AnalysisThe chemical analysis shall bemade in accordance with accepted practices. See Test MethodsA 751.6. Physical Requirements6.1 The material shall be thoroughly and uniformly an-nealed.6.2 Wire shall conform to the following elonga
10、tion require-ments:Size Elongation in10-in. (250-mm)minimum, %0.0035 in. (No. 39 Awg)(0.089 mm) and larger 120.0031 to 0.0020 in. (Nos. 40 to 44 Awg)(0.079 to 0.015 mm)67. Nominal Resistivity7.1 The nominal resistivity shall be the resistivity of thewire as quenched from a temperature above 1450F (7
11、88C).1This specification is under the jurisdiction of ASTM Committee B02 onNonferrous Metals and Alloys and is the direct responsibility of SubcommitteeB02.10 on Thermostat Metals and Electrical Resistance Heating Materials.Current edition approved May 1, 2007. Published June 2007. Originallyapprove
12、d in 1975. Last previous edition approved in 2001 as B 603 90 (2001).2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at serviceastm.org. For Annual Book of ASTMStandards volume information, refer to the standards Document Summary page onthe ASTM
13、website.TABLE 1 Chemical RequirementsClass Resistivity Range Composition Range, %Vcmil/ft Vcm Al CrI 825 to 920 135 to 150 5.00 to 6.00 20 to 24IIA 795 to 880 130 to 144 4.75 to 5.75 20 to 24IIB 770 to 855 130 to 144 4.00 to 5.25 20 to 24III 715 to 785 119 to 130 3.75 to 4.75 13 to 16IV 665 to 735 1
14、11 to 122 2.75 to 3.75 12 to 151Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.The numerical values of the resistivity range at 77F (25C)shall be as shown in Table 1.8. Test for Resistivity8.1 The resistivity shall be determined in a
15、ccordance withTest Method B63.9. Nominal Electrical Resistance for Unit Length9.1 The nominal resistance per unit length for round wireshall be calculated from the nominal resistivities and thenominal cross-sectional area.NOTE 1Actual values of resistivity and resistance change with tem-perature hav
16、e not been tabulated as they vary considerably with minorcomposition differences. Individual manufacturers should be contacted fordetailed information regarding their properties.NOTE 2When ribbon or flat wire is produced by rolling from roundwire, the cross section departs from that of a true rectan
17、gle by an amountdepending on the width-to-thickness ratio and the specific manufacturingpractice. The conventional formula for computing ohms per foot and feetper pound is to consider the cross section as 17 % less than a true rectanglewhen a width is more than 15 times the thickness and 6 % less th
18、an a truerectangle in other cases. This is not valid in view of modern rollingequipment and practices, but still is widely used as a basis of description.Ribbon actually is made to a specified resistance per foot, and no toleranceis specified for thickness.An alternative and a closer approximation w
19、ouldbe that for ribbon rolled from round wire, the electrical resistance wouldbe calculated on a cross 6 % less than a true rectangle.10. Tolerance on Electrical Resistance per Unit Length10.1 The actual resistance per unit length shall not varyfrom the nominal resistance by more than the amounts sh
20、ownin Table 2.NOTE 3Tolerances on dimensions are not specified since the materialis used for resistance purposes in which the resistivity and the electricalresistance per unit length rather than the dimensions are of primeimportance. The electrical resistance per unit length can be determinedmore ac
21、curately than the dimensions of very small sizes on wire or strip.11. Resistance Change with Temperature11.1 The change in resistance with change in temperatureshall be measured in accordance with Test Method B70.12. Accelerated Life Test12.1 When it is desired to determine the durability of themate
22、rial at high temperatures, life tests shall be made inaccordance with Test Method B78. Test results may bereported either in hours or in percentage of an acceptedstandard.12.2 The life or durability value shall be the average of threesimultaneous determinations each, on wire specimens of thematerial
23、s and on the reference standard.13. Finish13.1 The material shall be as uniform and free from surfacedefects such as splinters, cracks, splits, kinks, laminations,scale, and other irregularities as the best commercial practicewill permit. The finish shall be either bright annealed oroxidized, as spe
24、cified.14. Packing and Marking14.1 Packing shall be subject to agreement between themanufacturer and the purchaser.14.2 The material as furnished under this specification shallbe identified by the name or symbol and color code of themanufacturer and by melt number. The lot size for determiningcompli
25、ance with the requirements of this specification shall beone heat.15. Keywords15.1 electrical heating; heating elements; iron-chromium-aluminum; resistance alloys; resistorsASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mentione
26、din 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
27、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 International Headquarters. Your comments will receive careful consideration at a meeting of
28、theresponsible technical committee, which you may attend. If you feel that your comments have not received 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 C
29、700, West Conshohocken, PA 19428-2959,United States. Individual reprints (single or multiple copies) 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 Electrical Resistance ToleranceResistanceTolerance, %Round Wire:0.0050-in. (0.127-mm) diameter and larger 65Finer than 0.0050 to 0.0020-in. (0.127 to0.051-mm) diameter, incl68Finer than 0.0020-in. (0.051-mm) diameter 610Strip:Cold rolled 65Hot rolled 68B603072
