Tungsten Alloy
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- Category: Tungsten Alloy Price
- Published on Saturday, 08 December 2012 23:17
- Written by chinatungsten
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Tungsten alloy ,also named tungsten heavy alloy, generally is refractory metal, which have two-phase composites consisting of W-Ni- Fe or W-Ni- Cu or even W-Ni-Cu-Fe, some tungsten alloys are added Co、Mo、Cr, etc. They have very high melting point and have a density twice that of steel and are more than 50% heavier than lead. Tungsten content in conventional heavy alloys varies from 90 to 98 weight percent and is the reason for their high density (between 16.5 and 18.75 g/cc).
Nickel, iron and copper serve as a binder matrix, which holds the brittle tungsten grains together and which makes tungsten alloys ductile and easy to machine. Nickel-iron is the most popular additive, in a ratio of 7Ni:3Fe or 8Ni:2Fe (weight ratio). The conventional processing route for tungsten heavy alloy includes mixing the desired amount of elemental powders, followed by cold pressing and liquid phase sintering to almost full density.
The matrix alloy melts and takes some tungsten into solution during liquid phase processing, resulting in a microstructure through which large tungsten grains (20–60µm) are dispersed in the matrix alloy. The as-sintered material often is subjected to thermo mechanical processing by swaging and aging, which results in increased strength and hardness in the heavy alloys.
The majority of current uses for WHAs (tungsten heavy alloy) are best satisfied with the W-Ni-Fe system. Alloys such as 93W-4.9Ni-2.lFe and 95W-4Ni-lFe represent common compositions. The addition of cobalt to a W-Ni-Fe alloy is a common approach for slight enhancement of both strength and ductility. The presence of cobalt within the alloy provides solid-solution strengthening of the binder and slightly enhanced tungsten-matrix interfacial strength. Cobalt additions of 5 to 15% of the nominal binder weight fraction are most common.
Tungsten Alloy Main Application
When it comes to different function, tungsten heavy alloy products could widely used for different industries and countries in various fields: such as the sports, including golf, fishing, darts, yacht, racing car; the medical, including radiation shielding, source holder, collimator, isotope container, nuclear syringe; the scientific, including tungsten heat sinks, oil drill, mine exploitation. Due to increasing abundant demand of Depleted Uranium, tungsten is also widely used as a substitution in some parts of military products nowadays. As its high density similar to real gold, tungsten heavy alloy material is very famous as gold-plated substitution. It could be made such as gold-plated tungsten bar, golden tungsten brick, gold-plated tungsten bar, golden tungsten paperweight, gold-plated tungsten coin. For its high melting point, tungsten alloys are usually used for many high temperature working environments, such as rocket ignitron, turbine, etc. For its environment-friendly, tungsten alloy material is widely made as tungsten heavy alloy fishing sinker, jig, weights, it is much better than lead in small capacity but high density. Depending on special properties, tungsten alloys are very popular in our life now.
Tungsten Alloy Radiation Shielding
For its heavy density raging from 17.0 g/cm3 to 18.5 g/cm3, which is much denser than normal materials, tungsten heavy alloy is widely used as shielding in many fields, such as medicine industry, aerospace research or even our daily life for mobile radiation protection. Especially, tungsten alloy protection acted as collimator, syringe shielding and other shield, such as X-ray protection apron, are very important for eradiation treatment concerning X-rays, gama radiation, CT examination, etc.
Besides, tungsten alloy material worked as substitution to depleted uranium for nuclear radiation protection is essential to military field and aviation. If there is need, Chinatungsten can also offer engraving or coating technique as required.
|
Grade |
Application |
|
HA170 |
HA170 is the most ductile and readily machinable grade. Common application areas include counterbalancing weights for the aviation and aerospace industries, crankshaft and auto racing car, bucking bars for rivet setting, and radiation shielding. |
|
HA175 |
HA175 is commonly used to produce chatter-resistant boring bars and tool shanks as well as radiation shielding components. |
|
HA180 |
HA180 is often applied where size is a factor in the placement of balance or ballast weights. It should be typically of parts with small volume but heavy density. Other applications include radiation shields and collimators of x-ray or gamma ray beams. |
|
HA185 |
The densest of the Ni-Fe binder alloys with tungsten, and is the preferred grade for radiation shielding in the medical imaging industry. |
|
HA170C |
Adding copper as a substitute for iron in the binder phase, as there is requirement for nonmagnetic working environment and ideal choice for radiation shielding closing to a magnetic field. |
|
HA180C |
Much denser than HA170C that used as large shieldings in nonmagnetic working environment needed. |
Tungsten Alloy Military Defense
Different process methods could offer different properties, if you need high ultimate tensile strength and high hardness, tungsten alloy material usually need to be swaged, which are usually used in military field, such as tungsten heavy alloy swaging rod for armor piercing, bullet and hunting shot, tungsten alloy fragments; if they need just sintering, they could be offered as tungsten alloy cube, sphere, ball, etc. for military defense. Sometimes, in order to get a higher property, we usually add some other materials to mix the powder, such as Co, Mo, etc. If it comes to some parts used for navy, coated or electrodeposited chromium could be offered according to protect from saltness corrosion.
Chinatungsten Online offers tungsten alloy high-properties defense products as per military standard Mil-T-21014, or even could adjust some manufacture processes to meet a higher requirement for physical properties of hardness (42HRC min.), ultimate tensile strength (1400 MPa min.), yield strength(1300 MPa min.), elongation (8% min.), etc. Of course, if there is a need, we are willing to offer free standard testing rod for client evaluation before batch order.
|
Grade |
Class 1 |
Class 1 |
Class 2 |
Class 3 |
Class 3 |
Class 4 |
|
90%W6% |
90%W7% |
92.5%W5.25% |
95%W3.5% |
95%W3.5% |
97%W2.1% |
|
|
Density (gm/cc;lbs/in3) |
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 |
|
U.T.S. (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 |
Why not tungsten alloy?
product, which is a chemical compound that contains carbon and tungsten and is similar to titanium carbide. It was originally developed for use as a cutting tool, in machine tools applications, where it still finds wide use today. Cemented tungsten carbide is neither a metal nor is it a ceramic, which are prepared by reacting carbon and tungsten at a temperature of between 1400-2000ºC. With its highest hardness as 86~93 HRA (68~81HRC), however, it is not called tungsten alloys, but tungsten carbide, because its superior wear resistance and high cutting speed,. Besides, as it is easily brickle, tungsten carbide is widely used as cutting blade, drill, bits, nozzles, etc. but not for crack resistance, tungsten alloys are usually widely used as tungsten alloys radiation shielding, tungsten alloys crankshaft, tungsten alloys counterweight, which is usually made of tungsten alloys materil with its special properties as good elongation, small capacity with high density, good corrosion resistance, wonderful shock resistance, high radiation adsorption capability, etc.Why you should choose Chinatungsten Online?
With 20 years experiences, Chinatungsten Online has been being the leading tungsten heavy alloy manufacturer and top tungsten alloy suppliers in China. Now Chinatungsten Online is very pleased because, as the professional tungsten alloy manufacturer and tungsten alloy suppliers, it has offered hundreds of heavy alloys to more than 5000 clients worldwide in the past 2 decades. Also, We are very honored that we have offered our best service, design, drawing, repairing together with products. But it is just the reason made us as a special tungsten alloy manufacturer and tungsten alloy suppliers is sharing our experiences and recycling the waste tungsten materials back from our customers if it is expected. We are looking forwards to offering our tungsten materials in the form of sintered blank and/or finished ground parts according to the design of you.
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