2017 China New Design Tungsten Evaporation Boats - Tantalum Rod – Forged Tungsten

Chemical composition:

Main and minor components Min.content(%) ASTM B365
Ta 99.95 balance
Impurities Max.values (μg/g) Max.values (μg/g)
Fe 100 100
Mo 100 200
Nb 400 1000
Ni 50 100
Si 50 50
Ti 50 100
W 100 500
C 30 200
H 15 15
N 50 100
O 100 250
Cd 10 -
Hg 1 -
Pb 10 -

Diameter and tolerance

Diameter (mm) Diameter tolerance (mm)
Ground
3.00-15.9 ±0.05
16.0-24.9 ±0.10
25.0-34.9 ±0.25
35.0-39.9 ±0.40
40.0-50.0 ±0.80
Cleaned
3.00-4.74 ±0.076
4.75-9.51 ±0.102
9.52-12.69 ±0.127
12.70-15.87 ±0.178
15.88-19.04 ±0.203
19.05-25.39 ±0.254
25.40-38.09 ±0.381
38.10-50.79 ±0.508
50.80-63.49 ±0.762
63.50-120.0 ±1.50
Turned
30.0-49.9 ±0.30
50.0-120.0 ±0.40

Length and straightness:

Diameter (mm) Production length (mm) Stiraightness/Meter (mm)
Cleaned Ground/turned
3.00-9.90 >500 <2.5 <2.0
10.0-120.0 >300 <2.5 <1.5

Length tolerance:

Nominal length (mm) 6-30 30-120 120-400 400-1000 1000-2000 >2000
Length tolerance(mm) ±1.0 ±1.5 ±2.5 ±4.0 ±6.0 ±8.0

Density: ≥16.6g/cm³
Nondestructive testing: For diameters>15.00 mm:100% ultrasonic testing; For diameters of 0.50-50.0mm: Eddy curent tests on rods with ground surface.

Diameter(mm) Tensile strength(MPa) 0.2% Yield Strength (MPa) Elongation(%)
3.00-3.19 ≥207 - ≥20
3.20-63.5 ≥172 ≥103 ≥25

Surface condition:

Surface Pickled Ground Turned
  φ3.0-165.0mm φ3.0-50.00mm φ≥30.00mm
Roughness Diameter (mm) Ra (μm) Ground Ra (μm) Turned
  3.0-50.0 ≤1.20 -
≥30.0 - ≤3.2

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