Luma Tungsten Wire
Luma Tungsten Wire
Some characteristics of tungsten • Tungsten has the highest melting point and the highest tensile strength of all metals
• High strength at high temperatures
• Good conductivity for heat and electricity
• High absorption capacity for radioactive radiation and X-rays
• Tungsten has the lowest vapour pressure and the lowest
coefficient of thermal expansion of all metals in pure form
Example of applications
Antennas
Printing
Fuses
Musical strings
Lighting
Integrated circuit testing
Connectors
Mesh
Technical research
Medical
Properties
of bare Tungsten wire
Purity
Melting point
Automotive
99.95% W
3410 °C
Density
19.17 g/cm3
Specific electrical resistance at 20 °C
0.055 Ohm x mm2/m
Modulus of elasticity at 20 °C
410 kN/mm2
Wire qualities
820
Standard, non-sag quality wire containing minimum 99.95 % W, doped with potassium, silicon and a luminium.
821
A wire of 820 standard quality, which has passed the requisite tests to meet the demands for wire of a higher standard below Ø 50 microns i.e. virtually free from traces of cracks or splits.
823
Has a low concentration of unfavourable impurities. Has a long grain structure, high recrystallization temperature
and increased ductility.
Surface finishes
2014.03
Diameter range (microns)
(mils)
20
Black drawn wire for further redrawing
50 - 500
1.96 - 19.6
21
Black drawn wire
10 - 500
0.39 - 19.6
22
Black drawn wire, straightened
10 - 500
0.39 - 19.6
25
Black drawn wire, used as heating elemet
10 - 500
0.39 - 19.6
31
“21” wire, electrolytically cleaned
10 - 500
0.39 - 19.6
32
“21” wire, straightened and electrolytically cleaned
10 - 500
0.39 - 19.6
34
“32” wire with a highly polished surface
10 - 500
0.39 - 19.6
36
“32” wire with an ultra polished surface
10 - 500
0.39 - 19.6
37
oxidized surface
10 - 500
0.39 - 19.6
41
“21” wire, electrolytically etched to the final dimension
4 - 30
0.16 - 1.18
42
“21” wire, straightened and electrolytically etched to the final dimension
4 - 30
0.16 - 1.18
Ovality (out of roundness)
ø Microns
Standard
Available on request
< 15
Max 6%
Max 3%
> 15
Max 5%
Max 2%
95
/1
00
00
/1
90
85
/1
00
Straightness
0
Elongation
1 – 3%
Diameter tolerance
Weight tolerance
Wire size micron
Standard
On request
Standard
On request
>4<5
+/- 3.5%
+/- 2%
+/- 7%
+/- 4%
>5<10
+/- 2%
+/- 0.5%
+/- 4%
+/- 1%
>10<18
+/- 1.5%
+/- 0.25%
+/- 3%
+/- 0.5%
>18
+/- 1%
+/- 0.25%
+/- 2%
+/- 0.5%
50
Straightness
Wire with a finish of 32 and 42 is available in the
following grades of straightness.
ø Microns
ø Microns
ø Microns
< 15
15-30
> 30
3 (85/100)
standard
-
-
2 (90/100)
on request
standard
-
1 (95/100)
not available
on request
on request
Straighness grade
100 (cm)
Tensile strength Tungsten
Standard tensile strength of Tungsten
4400
4200
Max
4000
Average
Min
3800
3600
N/mm2
3400
3200
3000
2800
2600
2400
Micron
300 280 260 240 220 200 180 160 140 120
100
190 170 150 130 110 90 70 50
30
80 60 40
20
80 70 60 50 40
LUMA-METALL AB, Kalmar, Sweden
Telephone +46-480 42 90 45
e-mail: [email protected]
www.luma-metall.com
30
60 50 40 30
20
0.30
0.70
1.20
1.90
2.70
4.8
3.70
1.20
2.70
4.80
7.50
10.80
2.70
4.80
7.50
10.80
14.80
19.30
1.20
4.80
10.80
19.30
2.70
7.50
14.80
24.40
36.40
50.90
67.80
109
87.00
30
43
59
77
98
120
146
173
204
236
2000
mg/200mm
271
2200
40 35 30 25 20 15 10