ASTM F49-68(1972)

Specification for Molybdenum Strip for Electron Tubes (Withdrawn 1978)

General Information

• Status: Withdrawn
• Technical Committee: F01 - Electronics

Standards Content (Sample)

4~J~ er~~=~ ANSl/AsTM F 49 - 88 (Reapproved 1972)
Standard Specification for
1
MOLYBDENUM STRIP FOR ELECTRON TU BES
This Standard i1 i11ued under the fixed designation F 49; the number immcdiatdy fonowtng the de1~1.tlon indicates tllll
year of oriliJial adoption or, In the cue of rcviaion, the year of lut revision. A number in Jl"rellthaa iDdicata' the year of
!alt reappl'OYlll.
7Jr. comndltlJlr ~lbl1formu1t111tdllP'tl lull voted ila w#lulrnHil. In dM ""-m ofllflliatllndtll,.,,.,,,., dull It slloultl h
continwd, tM SodftY will 11pprrnt1 wltlulrtiw8l from publladlon Ill Ot:tobfl, 1978. .
l. Scope 3.2 Tensile Str11ngth-Tension test speci­
mens are to be prepared and tested in con­
1.1 This specification covers molybdclium
formity with Methods E 8, for Tension
strip from 0.001 in. (0.03 mm) to 0.080 in.
Testing of Metallic Materials.' Tensile prop­
(2.0 mm) thic" and up to approximately 6 in.
erties shall be determined using a strain rate
(150 mm) wide spccifiCany for use in electron
of 0,005 :1:: 0.002 in./in. (0.13 :1:: 0.05 mm/25
tubes. This material is made either by powder
mm)· min' up to·0.6 percent offset and 0.05 ::1::
metallurgy or by an:-c:asting methGds. The
0;02 in./in. (1.25 mm :::e 0.5 mm/25 mm)· min
difference is that carbon is used as a deoxi­
for tensile strength or fracture. All tensile
dizer for the arc-cast material.
testing shall be done at a temperature between
Non-The values stated in U.S. customary
18 C (65 F) and 30 C (86 F).
units arc to be reganlcd u the standard. The metric
equivalents of U.S. customary units may be approx­
3.3 Hardness-Not necessarily correlated
imate.
with tensile properties.
3.3.l When detcrmfoing microhardness
2. Cbemh:al Reqalre-.ta
using light loads, the best correlation and re:.
2.1 The molybdenum strip shall conform to
producibility can be obtained by use of Table
the requirements as to chemical composition
4.
as shown iri Table 1.
3.4 Bend and Delaminotion-Ben.d testing
2.2 The material shall be analyzed in ac­
shall be performed at a temperature between
cordance with appropriate ASTM methods.•
18 C (65 F) and 30 C (86 F) by bending the
When such methods are not available,
angle of 180 deg, without
sample through an
methods of analysis as mutually agreed upon
fracture. The bend shall be ma.de on a radius
by manufacturer and purchaser shall be em­
equal to that shown for soft temper, t being
ployed.
the thickness.
Bend Tell
3. PllyliC81 Reqalre~eau
Radius
3.1 T1'mper--Temper of material shall be Up to 0.040 in. (1 mm) Ir
0.04 l in. to 0.080 in. (I to 2 mm) 2t
· classified as follows:
3.1.l Hard-As rolled, not annealed, suit­
3.4.l These values shall apply to tests
able Jor spring applications.
taken both longitudinal an,d transverse to the
3.1.2 Soft-Stress· relieved, suitable for
direction of rolling. The specimen shall be
forming, bending or drawing. Recrystalli­
dcburred and shall have a width of 0.5 in. (13
zation may exist up to 10 percent, max. It is
mm) min.
usually estimated from a metallographic spec­
' This specification i• under the jurildietion of ASTM
imen prepared in the longitudinal direction.
Committee F-1 on l!lectronic1.
Comparative microstnicture standards as Current edition eft'ective A111. 15, 1968. Onpnlllly i1-
1ued 1!164. Replaces F 49 - 64 T.
agreed upon by manufacturer and purchaser
•Annual Book of ASTM Standanb, Part 12.
are recommended. • An1111tll Book of A.STM Stanffrtb, Part.I 6, ·7, and 10.
252

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F 48
aa shown in Fig. 1.
3.4.2 The material shall not show dclami·
nations at the bcnda. If dcburrina ii neces­
(H/L) x ·100 - percent out-of·Oatncu
sary, care shall be taken to preserve the edges
where:
for visual inspc,ction after bending.
H - maximum vertical distance between a
3.S Sprln1back-Thi1 test i.1 applicable to
flat reference surface and the lower sur­
strip 0.020 in. (O.Sl mm) or leas in thickness
face of the sheet, and
and shall be performed in accordance with
L minimum horizontal distance ·between
ASTM Method F lSS, Teat for Temper of
the higlicst point on the sheet and the
Strip and Sheet Met811 for Electronic De-­
point of contact with a flat reference
vic:es,4 with limits 11 agreed upon by prodUQCr
surface.
and consumer.
6.1.1.4 The· maximum percent out-of-flat·
ne11 shall be 4 pcnient for 0.020 in. (O.S 1 mm)
4. ftdall
thicknes1 and over and 5 percent for material
4.1 Union otherwise requcated, the molyb­
lcs1 than 0.020 in. (0.Sl mm) thick.
denum finish shall be bright in thickncs1e1 up
7. PllcbPll
to O.OOS in. (0.13 mm), bright or matte be­
twcen O.OOS in. (0.13 mm) and 0.060 in. (l.S 7 .1 Packagin1 shall be adequate to protect
mm), and matte finish ovor ~.060 in. (l.S the flat lengthi or coils from contamination
mm) in tbicknesi-. Tho· su'l'facw: mall be. or 'damage during shipmCJll.
smo.oih and free from dirt, oxide, pit•,
8. Mar.kjq·
1eratC:hca, seams, sta
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