TUNGSTEN BALANCE WEIGHTS

H.C. Starck, a worldwide manufacturer of tungsten balance weights made of technology metals , provides high performance solutions to customers in the aviation industry. Technology metals like tungsten alloys have been the choice material for machined and fabricated products in critical aerospace applications.

tungsten_balance_weights_250.jpg
Tungsten Balance Weights
Our machineable high-density tungsten alloys, with a density over 60 % higher than lead, help stabilize helicopter rotor blades and the control surfaces of ailerons, elevators, and rudder sections:
  • Aircraft and Helicopter Tungsten Balance Weights
  • 
Instrumentation Tungsten Balance Weights

  • Vibration Dampening Tungsten Weights



Produced and Certified to AMS-T-21024, AMS 7725 and ASTM B777.

Customer Collaboration with Tighter Process Controls

As a vertically integrated manufacturer, we exercise tight control of all our processes from refining the raw materials to delivering high purity finished products. H.C. Starck has a unique global reach allowing for close contact and collaboration with our customers. Our experienced Research and Development department allows us to constantly be at the forefront of technological advancement and development of new products together with our partners in the industry.

H.C. Starck supplies the following tungsten alloys:

Kulite® and HPM Tungsten Alloys

H.C. Starck supplies the long established Kulite® tungsten alloys from the U.S. (Table 1) and HPM tungsten alloys from Germany (Table 2).

Table 1 - Kulite® tungsten alloys (K1700 thru K1850)

Alloy Designation

K1700
K1701
K1750
K1800
K1801
K1850
Tungsten content
(%)90
90
92.5
95
95
97
Density
(g/cm3)
17
17
17.5
18
18
18.5

(lb/in3)
0.61
0.61
0.63
0.65
0.65
0.67
Hardness
(Rc)
23
22
24
25
24
26
Ultimate Tensile Strength
(psi)
125,000
110,000
125,000
125,000
110,000
120,000

(N/mm2)
860
760
860
860
760
830
Yield Strength
(psi)
85,000
80,000
90,000
90,000
85,000
95,000

(N/mm2)
590
550
620
620
590
660
Elongation
%
12
4
10
8
2
6
Modulus of Elasticity
(psi x 106)
45
40
46
48
45
50

(kN/mm2)
310
280
320
330
310
345
Magnetic Properties

slight
none
slight
slight
none
slight
Magnetic Permeability
(µ)
>1.05
<1.05
>1.05
>1.05
>1.05
<1.05
Thermal Expansion Coefficient
(x 10-6/K)
(20 °C - 500 °C)
5.1
5.4
4.9
4.8
5.0
4.8
Thermal Conductivity
(cgs)
.20
.23
.24
.27
.32
.26
Electrical Conductivity
(% IACS)
11
14
12
15
16
16
MIL-T-21014(D)
class
1
1
2
3
3
4
ASTM B777
class
1
1
2
3
3
4

Table 2 - HPM tungsten alloys

Typical properties of tungsten composite materials

Inspection
criterion

HPM
1700
HPM
1710
HPM
1701
HPM
1705
HPM
1750
HPM
1750
sheet
Tungsten content
%
90.0
90.0
90.0
90.0
92.5
92.5
Density
g/cm³
17.0 ± 0.2
17.0 ± 0.2
17.0 ± 0.2
17.3 ± 0.2
17.5 ± 0.2
17.6 ± 0.2
Hardness
HV 30
≤ 320
≤ 320
≤ 320
≤ 360
≤ 325
≤ 460
Tensile strength
(typical value)
MPa
850
850
670
900
840
870
Minimal yield strengt
MPa
520
520
520
520
520
520
Elongation
(typical value)
%
12
12
3
8
14
16
Young’s modulus
(average value)
GPa
320
320
300
330
340
340
Median coefficient of linear thermal expansion
20 – 100 °C
10-6/K
6.1
6.3
6.0
4.5
5.5
5.5
20 – 300 °C
10-6/K
6.2
6.5
6.2
5.1
5.7
5.7
20 – 450 °C
10-6/K
6.3
6.6
6.4
5.3
5.8
5.8
Thermal conductivity
W/mK
≥70
≥70
≥90
≥70
≥75
≥75
Electrical conductivity (average value)
%IACS
MS/m
11
6.4
11
6.4
14
8.1
13
7.5
12
6.9
12
6.9
Specific electrical resistance
(average value)
µΩm

0.16
0.16
0.12
0.13
0.15
0.15
Permeability µ

> 1.05
> 1.05
< 1.05
> 1.05
> 1.05
> 1.05


Inspection criterion

HPM 1751
HPM 1760
HPM 1800
HPM 1810
HPM 1801
HPM 1850
HPM 1850W
Tungsten content
%
92.5
92.5
95.0
95.0
95.0
97.0
97.0
Density
g/cm³
17.5 ± 0.2
17.6 ± 0.2
18.0 ± 0.2
18.0 ± 0.2
18.0 ± 0.2
18.5 ± 0.2
18.5 ± 0.2
Hardness
HV 30
≤ 325
≤ 325
≤ 332
≤ 332
≤ 332
≤ 340
≤ 340
Tensile strength
(typical value)
MPa
690
870
830
830
700
830
890
Minimal yield strengt
MPa
520
520
520
520
520
520
520
Elongation
(typical value)
%
3
16
14
14
2
12
12
Young’s modulus
(average value)
GPa
330
340
370
370
330
380
380
Median coefficient of linear thermal expansion
20 – 100 °C
10-6/K
5.7
5.5
4.9
5.2
5.4
5.1
4.8
20 – 300 °C
10-6/K
5.8
5.8
5.1
5.3
5.5
5.1
4.9
20 – 450 °C
10-6/K
5.9
5.9
5.2
5.5
5.6
5.2
5.0
Thermal conductivity
W/mK
≥85
≥75
≥80
≥80
≥85
≥75

≥80
Electrical conductivity (average value)
%IACS
MS/m
15
8.5
12
6.9
13
7.7
13
7.7
15
9.0
16
9.3
16
9.3
Specific electrical resistance
(average value)
µΩm

0.12
0.15
0.14
0.14
0.11
0.10
0.10
Permeability µ

< 1.05
> 1.05
> 1.05
> 1.05
< 1.05
> 1.05
> 1.05



Exceeds requirements of the following specifications: MIL-T-21014, ASTM B777 and AMS 7725

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