TUNGSTEN HIGH DENSITY ALLOYS

Tungsten alloys are exceptional for applications were maximum concentrated weight is required in the smallest possible space. In addition, tungsten is an outstanding material for high-vacuum technology up to the highest temperatures. Where pure tungsten is quite brittle and difficult to machine, the addition of chemical elements such as nickel, copper, and iron, creates a family of tungsten alloys with extremely useful properties.

These alloys are economically fabricated by powder metallurgy techniques and are routinely machined by conventional methods. Tungsten alloy products can be delivered both as semi-finished products for further processing by the customer or as a finished product in accordance with drawing specifications. These lead-free products meet legal requirements and recommendations to protect the environment.

Twice as heavy as steel and more than 50% heavier than lead, tungsten alloys have become an essential material for a wide variety of applications in aerospace, defense, medical, and oil and gas exploration.

Aerospace Applications

H.C. Starck’s tungsten alloys help balance and stabilize the control surfaces of ailerons, elevators and rudder sections. Helicopter rotor blades require precise static and dynamic balancing. A large variety of instruments from gyro rotors to airborne antennae use H.C. Starck tungsten alloys for precision balancing to achieve optimum performance. These balance weights are produced in an extraordinary range of sizes and shapes.

Aerospace and Defense Products

Aircraft balance/ballast weights, helicopter rotor/blade weights, instrumentation components, missile components, and engine flame sensors/shields, propulsion nozzles, ordnance.

Medical Applications

Tungsten’s hardness and high density make it ideal for the manufacture of heavy metal alloys that are critical in the field of X-ray generation and radiation shielding. Generally, the absorption of X-rays and gamma radiation is in direct proportion to the density of the shielding material. H.C. Starck’s tungsten alloys provide extremely efficient radiation shielding and protection.

The absorption of x-ray and gamma radiation is in direct proportion to the density of the shielding material. Tungsten High Density Composites are more than 1.5 times as effective as lead and provide extremely efficient protection, particularly where space is limited.

Medical Products

X-ray anodes, collimator or “anti-scatter” plates, radiation shielding, radioactive source containers, and syringe covers for radioactive isotope injection and radiopaque markers

Oil & Gas Drilling Applications

The radiation shielding properties of tungsten alloy materials are excellent for use in fabricating products to enclose data logging instrumentation and isotopes, essential to locating oil and gas deposits. By shielding the instrumentation and personnel from radiation it dramatically improves the performance of the data logging.

These materials enhances real-time data logging while optimizing the drilling performance, improve rates of drilling stability and reduce the cost and time of searching for these vital resources. In addition, H.C. Starck’s tungsten alloy products shield the gamma camera and sensors from the grueling work of drilling through the earth’s layers.

The high density of tungsten alloys, which is critical to the radiation shielding, are also extremely beneficial for sinker bar applications. These high density weights or series of weights are attached to the down hole logging tool assemblies in order to add the extra weight to help the tool properly descend through the heavy borehole fluids.

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 (x10-6/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 0.26

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

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


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



Downloads:

Product brochures

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  • Tungsten Alloys - Radiation Shielding and High Density Materials for Well Logging Instrumentation
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Product data sheet

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  • PDS number/_version
  • TUNGSTEN HIGH DENSITY ALLOYS
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  • PD-7048_0
  • KU-1000 Tungsten Powder Alloy
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  • PD-7052_0
  • TUNGSTEN HIGH DENSITY COMPOSITES
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  • PD-7100_0