ASTM F364-96(2002)

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Designation: F 364 – 96 (Reapproved 2002)
Standard Specification for
Molybdenum Flattened Wire for Electron Tubes
This standard is issued under the fixed designation F 364; 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 (e) indicates an editorial change since the last revision or reapproval.
TABLE 1 Chemical Composition
1. Scope
Composition, max, ppm
1.1 This specification covers two types of molybdenum
Element
Type I Type II
flattened wire up to 0.050 in. (1.27 mm) thick and up to 0.375
UNS R03604 UNS R03603
in. (9.52 mm) wide, specifically for use in electron tubes. The
Carbon 50 15
two grades have UNS numbers R03604 and R03603.
Oxygen 80 175
1.2 The values stated in inch-pound units are to be regarded
Nitrogen 20 10
as the standard. The values given in parentheses are for Hydrogen 10 10
Aluminum 150 150
information only.
Calcium 50 50
1.3 The following safety hazards caveat pertains only to the
Silicon 100 350
test method described in this specification (see 10.2). This Iron 100 100
Tungsten 200 200
standarddoesnotpurporttoaddressallofthesafetyconcerns,
Potassium 150 150
ifany,associatedwithitsuse.Itistheresponsibilityoftheuser
Tin 25 25
Other elements, each 50 50
of this standard to establish appropriate safety and health
practices and determine the applicability of regulatory limita-
min % by difference
tions prior to use.
Molybdenum 99.90 99.90
2. Referenced Documents
2.1 ASTM Standards:
4. Ordering Information
E 18 Test Methods for Rockwell Hardness and Rockwell
2 4.1 Orders for material under this specification shall include
Superficial Hardness of Metallic Materials
the following information:
E 315 Test Methods for Chemical Analysis of Molybde-
3 4.1.1 Quantity of each size,
num
4.1.2 Dimensions or size (see 8.1),
E 384 Test Method for Microhardness of Materials
4.1.3 Edgewise curvature (camber) if required (see 8.2),
3. Classification
4.1.4 Type (see 3.1),
4.1.5 Temper (see 7.1), and
3.1 Two types of molybdenum flattened wire are covered by
4.1.6 How furnished (coils, spools, etc.).
this specification:
3.1.1 Type I, UNS R03604—This type shall have the com-
5. Materials and Manufacture
position limits prescribed in Table 1.
5.1 The molybdenum wires covered by this specification
3.1.2 Type II, UNS R03603—This type shall be a high-
shall be made by any appropriate process.
recrystallization-temperature material having the composition
limits prescribed inTable 1 and shall be capable of retaining its
NOTE 1—It has been found that molybdenum wire made by the powder
ductility after firing at a temperature of 2375 6 25°F (1300 6
metallurgy process will meet the requirements of this specification.
14°C) for at least 20 min.
6. Chemical Composition
6.1 Type I and Type II molybdenum wire shall conform to
This specification is under the jurisdiction of ASTM Committee F01 on
the chemical compositions prescribed in Table 1.
Electronics and is the direct responsibility of Subcommittee F01.03 on Metallic
Materials.
6.2 The materials shall be analyzed in accordance with Test
Current edition approved June 10, 1996. Published August 1996. Originally
Methods E 315 or other appropriate ASTM methods when
published as F 364 – 73 T. Last previous edition F 364– 77 (1991).
available. Other methods, as mutually agreed upon between
Annual Book of ASTM Standards, Vol 03.01.
Annual Book of ASTM Standards, Vol 03.01. seller and purchaser, may be employed.
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F 364
TABLE 3 Thickness and Load for Determination of Diamond
7. Physical Properties
Pyramid Hardness or Vickers Hardness
7.1 Temper—Material under this specification shall be sup-
Thickness, in. (mm) Load, gf
plied in one of the following classifications of temper:
Less than 0.003 (0.08) 100
7.1.1 Hard—As-rolled, not stress-relieved, suitable for
0.003 to 0.0050 (0.08 to 0.127), incl 200
spring applications, or
Over 0.050 to 0.100 (0.127 to 2.54), incl 500
Over 0.100 (2.54) 1000
7.1.2 Stress-Relieved—Suitable for bending or winding.
7.2 The hardness test (see 10.1) is to be used as the criterion
for identifying hard and stress-relieved materials in accordance
TABLE 4 Dimensional Tolerances
with Table 2.
Tolerance
7.2.1 When determining microhardness using light loads,
Specified Thickness,
plus and mi-
the thickness and load relationships shown in Table 3 are in. (mm)
nus, in. (mm)
recommended for best correlation and reproducibility.
Up to 0.0050 (0.127), incl 0.0002 (0.005)
7.3 Bend and Delamination (Type I and Type II Wire in
Over 0.0050 to 0.0100 (0.127 to 0.254), 0.0003 (0.008)
incl
Stress-Relieved Temper)—In the as-received condition (no
Over 0.0100 to 0.0200 (0.254 to 0.508), 0.0004 (0.010)
firing), this wire shall show no evidence of cracking, splitting,
incl
delamination, or splintering when subjected to the bend and
Over 0.0200 to 0.0300 (0.508 to 0.762), 0.0005 (0.013)
incl
delamination test (see 10.2).
Over 0.0300 to 0.0500 (0.762 to 1.270), 0.0010 (0.025)
7.4 Bend and Delamination (Type II Wire in Hard and
incl
Stress-Relieved Tempers)—After firing Type II material at a
Tolerance plus
temperatureof2375 625°F(1300 614°C
...