40% IACS 0.58mm Copper Clad Steel Wire for Electronic Application ASTM B452

40% IACS 0.58mm Copper Clad Steel Wire for Electronic application ASTM B452
1. Scope
1.1 This specification covers bare round copper-clad steel
wire for electronic application.
1.2 Four classes of copper-clad steel wire are covered as
follows:
1.2.1 Class 30HS—Nominal 30 % conductivity harddrawn,
1.2.2 Class 30A—Nominal 30 % conductivity annealed,
1.2.3 Class 40HS—Nominal 40 % conductivity harddrawn,
and
1.2.4 Class 40A—Nominal 40 % conductivity annealed.
1.3 The values stated in inch-pound units are to be regarded
as the standard. The values given in parentheses are in SI units.
2. Referenced Documents
2.1 The following documents of the issue in effect on the
date of material purchase form a part of this specification to the
extent referenced herein:
2.2 ASTM Standards:
B 193 Test Method for Resistivity of Electrical Conductor
Materials2
B 258 Specification for Standard Nominal Diameters and
Cross-Sectional Areas ofAWG Sizes of Solid RoundWires
Used as Electrical Conductors2
2.3 National Institute of Standards and Technology:
NBS Handbook 100—Copper Wire Tables3
3. Ordering Information
3.1 Orders for material under this specification shall include
the following information:
3.1.1 Quantity of each size and class,
3.1.2 Wire size, diameter in inches (see 5.3 and Table 1),
3.1.3 Class of wire (see 1.2 and Table 1),
3.1.4 Packaging and shipping (Section 10),
3.1.5 If inspection is required (see 6.3.3), and
3.1.6 Place of inspection (see 6.1).
4. Material
4.1 The wire shall consist of a core of homogeneous
open-hearth, electric-furnace, or basic-oxygen steel with a
continuous outer cladding of copper thoroughly bonded to the
core throughout and shall be of such quality as to meet the
requirements of this specification (Note 1).
NOTE 1—The copper-clad steel wire provides a high-strength conductor
for use in wire and cable where greater strength is required and a lower
conductivity can be tolerated. At high frequencies the reduced conductivity
is less pronounced due to concentration of the current in the outer
periphery of the wire. Minimum thickness of 6 % and 10 % of the radius
for 30 and 40 % conductivity material, respectively, has been established
to facilitate the inspection of thickness on fine wires.
5. General Requirements
5.1 Tensile Strength and Elongation—The copper-clad steel
wire shall conform to the tensile strength and elongation
requirements of Table 1. For intermediate sizes not listed in
Table 1, the elongation requirements of the next smaller size
shall apply; in the case of tensile strength, the requirements of
the next larger size shall apply.
5.2 Resistivity—The electrical resistivity at a temperature of
20°C shall not exceed the values prescribed in Table 2. See
Note 2 for calculating electrical resistance.
NOTE 2—Relationships which may be useful in connection with the
values of electrical resistivity prescribed in this specification are shown in
Table 3. Resistivity units are based on the International Annealed Copper
Standard (IACS) adopted by IEC in 1913, which is 1⁄58 V·mm2/m at 20°C
for 100 % conductivity. The value of 0.017241 V·mm2/m and the value of
0.15328 V·g/m2 at 20°C are respectively the international equivalent of
volume and weight resistivity of annealed copper equal to 100 %
conductivity. The latter term means that a copper wire 1 in. in length and
weighing 1 g would have a resistance of 0.15328 V. This is equivalent to
a resistivity value of 875.20V· lb/mile2, which signifies the resistance of
a copper wire 1 mile in length weighing 1 lb. It is also equivalent, for
example, to 1.7241 μV/cm of length of a copper bar 1 cm2 in cross section.
A complete discussion of this subject is contained in NBS Handbook 100.
The use of five significant figures in expressing resistivity does not imply
the need for greater accuracy of measurement than that specified in Test
Method B 193. The use of five significant figures is required for complete
reversible conversion from one set of resistivity units to another.
5.3 Dimensions and Permissible Variations—The wire sizes
shall be expressed as the diameter of the wire in decimal
fractions of an inch to the nearest 0.0001 in. (0.003 mm) (Note
3). For diameters under 0.0100 in. (0.254 mm), the wire shall
not vary from the specified diameter by more than 60.0001 in.
(0.003 mm) and for diameters of 0.0100 in. (0.254 mm) and
over, the wire shall not vary from the specified diameter by
more than 61 %, expressed