This specification covers annealed, drawn or rolled iron-chromium-aluminum alloy shapes used for electrical heating and resistance purposes. This specification contains the requirements for chemical composition, electrical resistance, mechanical properties and temperature-dependent changes in resistance of the alloys.

1.1 This specification covers annealed, drawn, or rolled shapes for electrical heating and resistance purposes of alloys consisting mainly of iron, chromium, and aluminum as detailed in Table 1.

Class

Resistivity Range

Composition Range, %

Ω·cmil/ft

μΩ·cm

Al

Cr

I

825 to 920

135 to 150

5.00 to 6.00

20 to 24

IIA

795 to 880

130 to 144

4.75 to 5.75

20 to 24

IIB

770 to 855

130 to 144

4.00 to 5.25

20 to 24

III

715 to 785

119 to 130

3.75 to 4.75

13 to 16

IV

665 to 735

111 to 122

2.75 to 3.75

12 to 15

1.2 The values stated in inch-pound units are to be regarded as standard. The values given in parentheses are mathematical conversions to SI units that are provided for information only and are not considered standard.

1.3 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to become familiar with all hazards including those identified in the appropriate Material Safety Data Sheet (MSDS) for this product/material as provided by the manufacturer, to establish appropriate safety and health practices, and determine the applicability of regulatory limitations prior to use.