China Factory for Polished 1/8 Oz Tungsten Round Bar Weight For Derby

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Chemical composition:

Main and minor components Min.content(%) ASTM B760
W balance balance
La 0.77-0.94%  
La2O3 0.90-1.10%  
Impurities Max.values (μg/g) Max.values (μg/g)
Al 15 -
Cu 10 -
Cr 20 -
Fe 30 100
K 10 -
Ni 20 100
Si 20 100
Mo 100 -
C 30 100
H 5 -
N 5 100
Cd 5 -
Hg 1 -
Pb 5 -

Diameter and tolerances:

Diameter (mm) Tolerance
  Forged Turned Ground
1.20-1.99 -   ±0.010
2.00-2.99 -   ±0.015
3.00-15.9 -   ±0.020
16.0-24.9 ±0.30   ±0.030
25.0-34.9 ±0.40   ±0.050
35.0-39.9 ±0.40 ±0.30 ±0.060
40.0-50.0 ±0.40 ±0.30 ±0.20
50.0-80.0 ±1.00 ±0.40 -

Length and straightness:

Diameter (mm) Production length (mm) Stiraightness/Meter (mm)
Cleaned Ground/turned
1.20-10.0 ≥500 <2.5 <2.5
10.1-50.0 ≥300 <2.0 <1.5
50.1-80.0 ≥100 <2.0 <1.5

Length tolerance:

Diameter 1.20-30.0 mm

Nominal length (mm) ≥15 15-120 120-400 400-1000 1000-2000 >2000
Length tolerance(mm) ±0.2 ±0.3 ±0.5 ±2.0 ±3.0 ±4.0

Diameter >30.0 mm

Nominal length (mm) ≥30 30-120 120-400 400-1000 1000-2000 >2000
Length tolerance(mm) ±0.5 ±0.8 ±1.2 ±4.0 ±6.0 ±8.0

Density: 

Diameter (mm) Density (g/cm³)
1.20-6.0 18.85
6.0-40.0 18.75
40.0-80.0 18.65

Nondestructive testing: For diameters>15.00 mm: 100% ultrasonic testing. For diameters of 1.2-50.0mm: Eddy curent tests fro ground products visual inspection.

Diameter(mm) Hardness(HV 30)
3.0-10.0 >420
10.0-30.0 >400
30.0-50.0 >380
≥50 >350

Surface condition:

Diameter (mm) Surface condition
≤2.50 ground Ra≤0.8μm
2.50-30.0 ground Ra≤1.0μm
30.0-50.0 ground Ra≤1.2μm
≥50.0 Turned Ra≤3.2μm

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