The values stated in inch-pound units are to be regarded as the standard. The values given in parentheses are for information only. Significance and Use This specification on nickel-chromium and nickel-chromium-iron alloys contains the requirements for chemistry, electrical resistance, mechanical properties, and packaging. Chemical Requirements The alloys shall conform to the requirements as to chemical composition prescribed in Table. Samples for Chemical Analysis - Specimens for chemical analysis may be taken from either the melt or from a sample of finished wire that is representative of the lot. The lot size for detemining compliance with the requirements of this specification shall be one heat.
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A number in parentheses indicates the year of last reapproval. The values given in parentheses are mathematicalconversions to SI units that are provided for information onlyand are not considered standard.
Referenced Documents2. Significance and Use3. Alloy Classes4. Nominal Electrical Resistance per Unit Length7. NOTE 1—When ribbon or flat wire is produced by rolling from roundwire, the cross section departs from that of a true rectangle by an amountdepending on the width-to-thickness ratio and the specific manufacturingpractice.
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.
Temperature Coefficient of Resistance8. Current edition approved May 1, Published May Originallyapproved in Last previous edition approved in as B — Permissible Variations in Electrical Resistance Permissible Variations in Dimensions The electrical resistance per unit length can bedetermined more accurately than the dimensions of very smallwire. DinDiameterand Finer12 3 a nickel base, nonmagnetic 1.
Values shown for other classes are for information only. BAlloy Classes 1a, 1b, 1c, 2a, 2b, 3a, 4, and 6 are designed to give a low emf versus copper. Maximum indicatesthe maximum deviation from zero and the plus or minus sign the polarity of the couple. CThe maximum temperature values listed apply to the alloy wire only. Caution should be exercised pending knowledge of the maximum temperature of use for the coatingmaterial involved.
DIf metric sizes are desired, 1 in. All of the information included in this note is based on measurements made in accordancewith Test Method B Enamel Coatings The tension on the wireshall not exceed one half of its yield strength. The surface of the coating shall be smooth and uniform. Theenamel shall not be underbaked so that one turn adheres to thenext on a spool.
The rubbing action shall be sufficiently slow sothat the coating is not heated by friction. The test shall be made2 to 10 min after removal of the wire from the oil, lightlywiping off the excess oil.
Insulated Coverings 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 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 received a fair hearing you shouldmake your views known to the ASTM Committee on Standards, at the address shown below. Permission rights to photocopy the standard may also be secured from the ASTM website www.
A number in parentheses indicates the year of last reapproval. The values given in parentheses are mathematicalconversions to SI units that are provided for information onlyand are not considered standard. Referenced Documents2. Significance and Use3. Alloy Classes4. Nominal Electrical Resistance per Unit Length7.
Перечень основных ASTM (Американских Стандартов) по цветным металлам
Taujora Caution should be exercised pending knowledge of the maximum temperature of use for the coating material involved. B — 07 Standard Speci? To convert from inches to millimetres multiply by Values shown for other classes are for information only. A number in parentheses indicates the year of last reapproval. Your comments are invited either for revision of this standard or for additional standards and should be addressed to ASTM International Headquarters. Each bare wire should conform to the requirements for nominal resistivity, elongation, thermal electromotive force with respect to copper, and the temperature coefficient of resistance contained in this specification. Your comments will receive careful consideration at a meeting of the responsible technical committee, which you may attend.
ASTM B267 - 07(2018)
ASTM B267 - 07(2018), Standard Specification for Wire for Use In Wire-Wound Resistors