Tungsten has a high melting point, is hard and brittle, and is difficult to process. However, as long as there is a reasonable process, tungsten can be processed into materials through powder metallurgy, extrusion, forging, rolling, spinning and drawing. As the degree of plastic processing of tungsten increases, its structure, tensile strength and plastic-brittle transition temperature are greatly improved.
Tungsten Alloy details
High specific gravity tungsten alloy (TungstenHeavy Alloy, referred to as WHA) products usually use WNiFe or WNiCu or WNiCuFe as raw materials and are produced through powder metallurgy processes. According to different product uses and working environment requirements, the tungsten content of high-specific gravity tungsten alloy products is usually 79%W to 97%W, and the density is 15.00g/cm3 to 18.50g/cm3. At the same time, some rare metal elements (Co, Mo, Cr, etc.) can also be added to improve some properties of the product, such as: hardness (Hardness), ultimate tensile strength (Ultimate Tensile Strength), yield strength (yield strength) and elongation ( Elongation). wait.
Tungsten alloy is an alloy based on tungsten and added with other elements. Among metals, tungsten has the highest melting point, good high-temperature strength and creep resistance, as well as thermal conductivity, electrical conductivity and electron emission properties. It has a large proportion. In addition to being widely used in manufacturing cemented carbide and as alloy additives, tungsten and its alloys are widely used. It is used in the electronics and electric light source industries, and is also used in the aerospace, foundry, weapons and other departments to make rocket nozzles, die-casting molds, armor-piercing cores, contacts, heating elements and heat shields, etc.
Tungsten Alloy Grade Standard:
AMS-T-21014
AMS-T-21014
Class 1
Class 1
Class 2
Class 2
Ratio
90W7Ni3Fe
91W6Ni3Fe
92W5Ni3Fe
93W4Ni3Fe
Densities(g/cm3)
17.1±0.15
17.25±0.15
17.50±0.15
17.60±0.15
Heat treatment
Sinter
Sinter
Sinter
Sinter
Tension strength(MPa)
900-1000
900-1000
900-1100
900-1100
Elongation (%)
18-29
17-27
16-26
16-24
Hardness(HRC)
24-28
25-29
25-29
26-30
AMS-T-21014
Class 3
Class 3
Class 4
Ratio
95W3Ni2Fe
96W3Ni1Fe
97W2Ni1Fe
Densities(g/cm3)
18.10±0.15
18.30±0.15
18.50±0.15
Heat treatment
Sinter
Sinter
Sinter
Tension strength(MPa)
920-1100
920-1100
920-1100
Elongation (%)
10-22
8-20
6-13
Hardness(HRC)
27-32
28-34
28-36
Anviloy
Product
Normal ratio
Densities(g/cm3)
Ultimate tensile strength(N/mm2)
Hardness(HRC)
Application
Anviloy 1150
90%W4Mo4Ni2Fe
17.25
965
34
Anviloy 4200
93%WNiFeMo
17.8
885
30
Die Casting
Anviloy 4000
90%WNiFeMo
17.3
960
32
Die casting tools
Anviloy 4100
86%WNiFeMo
16.7
1075
36
Die casting tools
Mil-T-21014
NAVY MIL-T-21014: Tungsten based parts, heavy metal (sintered or hot pressed), plating, electroplated chromium.
Grade
Mil-T-21014
Class1
Class 1
Class 2
Class 3
Class 3
Class 4
Ratio
90%W,
90%W,
92.5%W,
95%W,
95%W,
97%W,
6%Ni4%Cu
7%Ni3%Fe
5.25%Ni
3.5%Ni
3.5%Ni
2.1%Ni
2.25%Fe
1.5% Cu
1.5%Fe
0.9%Fe
Densities(g/cm3)
17;0.614
17;0.614
17.5;0.632
18;0.65
18;0.65
18.5;0.668
Hardness (RC)
24
25
26
27
27
28
Ultimate tensile strength (PSI)
110,000
120,000
114,000
110,000
120,000
123,000
Yield Strength, .2% Offset (PSI)
80,000
88,000
84,000
85,000
90,000
85,000
Elongation (% in 1″)
6
10
7
7
7
5
Proportional elastic limit (PSI)
45,000
52,000
46,000
45,000
44,000
45,000
Magnetism
Nil
Slightly
Slightly
Nil
Slightly
Slightly
Magnetic
Magnetic
Magnetic
Magnetic
ASTM-B-459-67
Grade1
Grade1
Grade2
Grade3
Grade3
Grade4
Type Ⅱ && Ⅲ
Type Ⅱ && Ⅲ
Type Ⅱ && Ⅲ
Type Ⅱ && Ⅲ
Type Ⅱ && Ⅲ
Type Ⅱ && Ⅲ
ASTM B 777-99
Class
Class1
Class2
Class3
Class4
Tungsten ratio %
90
92.5
95
97
Density(g/cc)
16.85-17.25
17.15-17.85
17.75-18.35
18.25-18.85
Hardness (HRC) Max
32
33
34
35
Ultimate Tensile Strength
ksi
110
110
105
100
Mpa
758
758
724
689
Yield strength at 0.2% off-set
ksi
75
75
75
75
Mpa
517
517
517
517
Elongation, %
5
5
3
2
Process flow
1. Mixing: Mix tungsten powder, nickel powder and iron powder (if the product has magnetic requirements, copper powder can be added instead of iron powder).
Mixing → Vacuum drying → Press molding → Pre-burning and degreasing → Processing and molding → Vacuum sintering → Quality inspection → Blank products → Subsequent processing (oil immersion, machining, heat treatment, electroplating, rolling, forging, etc.) → Precision grinding products → Products out of warehouse
main products
Tungsten alloy fishing pendant series: bullet type, water drop type, round tube type, semi water drop type, cylindrical hole type.
Tungsten beads and tungsten ball series: φ1.5mm-φ10mm, accuracy ±0.01mm, used for fish sinker weights, submunition bombs, medical instrument weights, shotgun projectiles; φ0.1mm-φ10mm, accuracy ±0.1mm, used for oil drilling balance, Shotgun pellets.
High-density tungsten-based alloy counterweight series: mechanical counterweights; flyweights; oil drilling counterweight rods; dart rods; golf counterweights; racing counterweights; vibrators for mobile phones and game consoles; aerospace gyroscopes; Clock pendulum; balance weight ball; shock-proof knife bar.
Medical tungsten alloy radiation shielding material series:
1. Tungsten alloy grating blades;
2. Tungsten alloy protective tanks - used as medical radioactive shielding walls; shielded needles - used for shielding medical radioactive liquids; tungsten alloy storage - tanks, boxes and other containers used to store radioactive materials.
3. Collimator--collimator used for tungsten alloy series detection container systems in medical linear accelerators and nuclear technology applications; shielding of Co60 and other radiation.
Electrical material series: electrodes for EDM and resistance welding; high specific gravity electrical contacts, contacts in air circuit breakers.
Military series: armor-piercing bullets; submunitions, balls, rods, square particles, cylinders, other tungsten alloy electric heading blocks, tungsten alloys for nuclear technology applications.
The more commonly used ones are: W-Ni-Cu and W-Ni-Fe. This material has remarkable characteristics in physical properties such as density, strength, hardness, ductility, electrical conductivity/thermal properties, etc., so it is widely used in the defense industry, aerospace industry, medical industry, electrical industry and other industries.
