ASTM B344-01
(Specification)Standard Specification for Drawn or Rolled Nickel-Chromium and Nickel-Chromium-Iron Alloys for Electrical Heating Elements (Withdrawn 2011)
Standard Specification for Drawn or Rolled Nickel-Chromium and Nickel-Chromium-Iron Alloys for Electrical Heating Elements (Withdrawn 2011)
SCOPE
1.1 This specification covers annealed, drawn, or rolled shapes for electrical heating purposes, of alloys having the nominal compositions of 80 % nickel and 20 % chromium; 60 % nickel, 16 % chromium, and remainder iron; and 35 % nickel, 20 % chromium, and remainder iron.
1.2 The values stated in inch-pound units are to be regarded as the standard. The values given in parentheses are for information only.
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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
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Designation: B344 – 01
Standard Specification for
Drawn or Rolled Nickel-Chromium and Nickel-Chromium-
1
Iron Alloys for Electrical Heating Elements
This standard is issued under the fixed designation B344; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (ϵ) indicates an editorial change since the last revision or reapproval.
1. Scope 4.3 Chemical Analysis—The chemical analysis shall be
made in accordance with Test Methods A751, or by other
1.1 This specification covers annealed, drawn, or rolled
analytical methods approved by the purchaser.
shapes for electrical heating purposes, of alloys having the
4.4 Actual chemical analysis is not required for routine
nominal compositions of 80 % nickel and 20 % chromium;
acceptance.
60 % nickel, 16 % chromium, and remainder iron; and 35 %
nickel, 20 % chromium, and remainder iron.
5. Physical Requirements
1.2 The values stated in inch-pound units are to be regarded
5.1 The material shall be thoroughly and uniformly an-
as the standard. The values given in parentheses are for
nealed.
information only.
5.2 Wire shall conform to the following elongation require-
2. Referenced Documents ments:
2
Size Elongation in 10 in.,
2.1 ASTM Standards:
min, %
A751 Test Methods, Practices, andTerminology for Chemi-
0.0035 in. (0.0889 mm) (No. 39 Awg) and larger 20
cal Analysis of Steel Products 0.0031 in. (0.0787 mm) to 0.002 in. 10
(0.0508 mm) (Nos. 40 to 44 Awg)
B63 Test Method for Resistivity of Metallically Conducting
Resistance and Contact Materials
5.3 Determination is not required for routine acceptance.
B70 Test Method for Change of Resistance With Tempera-
6. Nominal Resistivity
ture of Metallic Materials for Electrical Heating
B76 Test Method forAccelerated Life of Nickel-Chromium
6.1 The nominal resistivity (Note 1) shall be the resistivity
and Nickel-Chromium-Iron Alloys for Electrical Heating
of the wire as quenched from a temperature above 1450°F
(788°C). The numerical value of the nominal resistivity shall
3. Significance and Use
be as shown in Table 2.
3.1 This specification on nickel-chromium and nickel-
6.2 Determination is not required for routine acceptance.
chromium-iron alloys contains the requirements for chemistry,
NOTE 1—The characteristics of these alloys are such that the actual
electrical resistance, mechanical properties, and packaging.
resistivity of annealed wire may be as much as 6 % higher than the
nominal, depending on its method of manufacture.
4. Requirements
4.1 The alloys shall conform to the requirements as to
7. Test for Resistivity
chemical composition prescribed in Table 1.
7.1 The resistivity shall be determined in accordance with
4.2 Samples for Chemical Analysis—Specimens for chemi-
Test Method B63.
calanalysismaybetakenfromeitherthemeltorfromasample
7.2 Determination is not required for routine acceptance.
of finished wire that is representative of the lot.
4.2.1 The lot size for determining compliance with the 8. Nominal Electrical Resistance for Unit Length
requirements of this specification shall be one heat.
8.1 The nominal resistance per unit length for round wire
shallbecalculatedfromthenominalresistivityandthenominal
1
cross-sectional area.
This specification is under the jurisdiction of ASTM Committee B02 on
Nonferrous Metals and Alloys and is the direct responsibility of Subcommittee
NOTE 2—When ribbon or flat wire is produced by rolling from round
B02.10 on Thermostat Metals and Electrical Resistance Heating Materials.
wire, the cross section departs from that of a true rectangle by an amount
Current edition approved Dec. 10, 2001. Published February 2002. Originally
depending on the width-to-thickness ratio and the specific manufacturing
published as B344 – 59. Discontinued January 2001 and reinstated as B344 - 01.
practice. The conventional formula for computing ohms per foot and feet
DOI: 10.1520/B0344-01.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or perpoundistoconsiderthecrosssectionas17 %lessthanatruerectangle
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
when width is more than 15 times the thickness and 6 % less than a true
Standards volume information, refer to the standard’s Document Summary page on
rectangle in other cases. This is not valid in view of modern rolling
the ASTM website.
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B344 – 01
TABLE 1 Chemical Requirements
Composition, %
Element
80 Nickel-20 Chromium Alloy 60 Nickel-16 Chromium Alloy 35 Nickel-20 Chromium Alloy
A
Nickel remainder 57 min 34
...
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