High PerformanceTungsten Heating Element For Vacuum - Molybdenum Copper Alloy – Forged Tungsten

Chemical composition:

Main and minor components Min.content(%)
Mo 67-73
Cu 27-33
Impurities Max.values (μg/g)
Al 10
Cr 20
Fe 20
K 20
Ni 10
Si 30
W 300
C 100
H 10
N 10
O 1000
Sn 10
Sb 20
Sr 10
V 10
Cd 5
Hg 1
Pb 5

Thickness and width tolerances:

  Tolerances with width Width tolerance
Thickness(mm) Max. 400 mm ± mm or % of the thickness [± mm]
0.20-0.30 0.020 0.5
0.30-0.40 0.030 0.5
0.40-0.60 0.035 1.6
0.60-1.00 0.040 1.6
1.00-1.50 4% 1.6
1.50-2.00 4% 1.6

Lengh tolerance
The length tolerance for all dimensions is maximal +5/-0 mm.

Flatness max. 4% (measuring procedure on the basis of ASTM B386)
Density ≥ 9,7 g/cm³
Thermal expansion coefficient ≤ 9,5 [10-6 × K-1 ]
Thermal conductivity [λ at 20°C] 150 – 190 [W/mK]
Specific electrical resistance [ρ at 20°C] ≤ 0,040 [µΩm]
[E-Modulus at 20°C] 215 – 240 GPa
Vickers hardness ≥ 180 HV
Appearance The material will be of uniform quality, free from foreign matter, splits and fractures. Bed sheets (not trimmed) may have small edge cracks.
Surface roughness Cold-rolled, ground:Ra≤1.5µm
Cold-rolled: Ra≤1.5µm

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