Tungsten Dart News & Info

Tungsten Fishing Sinkers 1

Details: Category: Tungsten Information; Published on Thursday, 28 August 2014 08:50

Tungsten fishing sinkers are weight used in conjunction with a fishing lure or hook to increase its rate of sink, anchoring ability, and casting distance. Fishing sinkers have two-fold function, first getting the bait rig where you want but should keep it there.

Different tungsten fishing sinkers have different weights. According to different uses or places they are used, it may be as small as 1/32 of an ounce for applications in shallow water, and even smaller for fly-fishing applications, or as large as several pounds or considerably more for deep sea fishing. Then according to different anglers, the concentration of shape and weight is different too. For example, for pier fishing, where distance is less important than structure and location, the weight of the sinker is more important than its overall shape. Other factors come into play for shoreline fishing, of course the angler's needs become more specialized.

Many environmentalists has been well studied the effect of lead shotgun shot on the environment and it was first reported in the late 1800s that large die-offs due to lead poisoning and continued through the next century, eventually the 1991 Federal ban on the use of lead shot in hunting turned up.

tungsten-fishing-sinkers

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Introduction of Tungsten Rod

Details: Category: Tungsten Information; Published on Wednesday, 27 August 2014 16:58

Brief introduction:

Tungsten rod is divided into firing tungsten rod, forging tungsten rod and polishing tungsten rod according to different production processes. The crystal structure of tungsten rod is compact.

Applications of tungsten rod:

Tungsten rod is widely used to produce cathode, components for electron tubes, grid siderod, lead, support, etc.

Appearance of tungsten rod:

Tungsten rod has no camber, crack, burr, peeling or other defects affecting the further uses.

The surface of firing tungsten rod appears silver gray metallic luster;

The surface of forging tungsten rod has a layer of oxide and slight forging hammer mark, so the surface is black;

The surface of polishing tungsten rod appears silver gray metallic luster and has no obvious oxidized phenomenon.

Tungsten rod and other tungsten products are all industrial products. These tungsten products are manufactured by special factory. Whether it is 99.95%, 99.96%, 99.97%, 99.98% tungsten rod or 99.99% tungsten rod, all tungsten rods are made by powder metallurgy method.

The followings are several production steps of tungsten rod:

Step one: Produce tungsten powder. Manufacturers need ensure the purity and particle size of tungsten powder. Ore of tungsten adds ammonium tungstate, after two reduction and purification, tungsten powder is made.

Step two: Put tungsten powder into leather sheath, hammer the tungsten powder into rod shape by using machine.

Step three: Then put the tungsten rod embryonic form into high temperature to sinter by using sintering furnace.

Step four: Finish tungsten rod producing by hammering, straightening and grinding.

1 .tungsten rod chemical compositions and applications:

type	purity of tungsten	application
WAL1	>=99.92%	filament,cathode and components for electron tubes,electrode for the gas discharge tube.etc.
WAL2	>=99.92%
WAL3	>=99.92%	grid siderod,lead,support,electrode for the discharge lamp,etc.
W1	>=99.95%	grid siderod,support,lead and electrode,etc.

2. tungsten rod forms and dimensions:

furnished form	specified diameter	min.length
wroughted	2.8<=d<5.0	600
	5.0<=d<6.5	300
	6.5<=d<11.0	200
straightened	0.8<=d<1.0	1000
straightened	1.0<=d<3.0	800
ground	0.8<=d<3.0	800-1000
	3.0<=d<6.5	300-600
	6.5<=d<10.0	200

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Introduction of Tungsten Bar

Details: Category: Tungsten Information; Published on Wednesday, 27 August 2014 16:45

Tungsten bar has low content of impurities and good processing performance.

The tungsten density is 18g/cm3-18.3g/cm3 and tungsten purity is more than 99.95%.

The annual output of tungsten bar is small, while, tungsten bar is widely applied. Tungsten bar is made of tungsten powder whose tungsten density is more than 95%.

The melting point of tungsten bar is 3500 ℃. At present, the tungsten ore is mainly distributed in China and Russia. Now, China is the world's largest tungsten export country. Usually, the purity of tungsten bar should be above 99.95%.

The followings are some applications of tungsten bar:

1, Tungsten bar is used to process cutter head, tungsten wire for lighting and various heat conductor.

2, Tungsten bar is applied to make crankshaft of advanced automobile, charge mixture of cylinder and tungsten bar is also used to cast a variety of ingredients of heat resistant steel.

3, Tungsten bar is widely used in the manufacture of artillery, rockets, satellites, aircraft, ships.

Tungsten bar is greatly demanded in the market. The price of tungsten bar varies according to the purity of tungsten bar. There are tungsten bar with the purity of 99.95%, 99.96%, 99.97% and 99.98%. More owners of tungsten bar often wrongly use the tungsten bar in the gold reserve way. Some people would regard the tungsten bar as material property, thus transferring and mortgaging the tungsten bar. This is absolutely a misunderstanding. Tungsten bar is tungsten bar and can not be equated with gold tungsten.

Characteristics of tungsten bar:

The melting point of tungsten bar is 3410℃. Tungsten bar has Excellent thermal/electric conductivity. The crystal structure of tungsten bar is impact, so tungsten bar has good erosion resistance.

Applications of tungsten bar:

Tungsten bar is generally used to manufacture emitting cathode, high temperature setting lever, support, lead, print needle and all kinds of electrodes and the quartz furnace heater.

Appearance of tungsten bar:

Tungsten bar has no bending, crack, burr, peeling and other defects affecting the further uses.

1 .tungsten bar chemical compositions and applications:

type	purity of tungsten	application
WAL1	>=99.92%	filament,cathode and components for electron tubes,electrode for the gas discharge tube.etc.
WAL2	>=99.92%
WAL3	>=99.92%	grid siderod,lead,support,electrode for the discharge lamp,etc.
W1	>=99.95%	grid siderod,support,lead and electrode,etc.
W2	>=99.92%	grid siderod,support,lead and electrode,etc.

2. tungsten bar forms and dimensions:

furnished form	specified diameter	min.length
wroughted	2.8<=d<5.0	600
	5.0<=d<6.5	300
	6.5<=d<11.0	200
straightened	0.8<=d<1.0	1000
straightened	1.0<=d<3.0	800
ground	0.8<=d<3.0	800-1000
	3.0<=d<6.5	300-600
	6.5<=d<10.0	200

Application of Tungsten

Details: Category: Tungsten Information; Published on Wednesday, 27 August 2014 14:29

Approximately half of the tungsten is consumed for the production of hard materials – namely tungsten carbide – with the remaining major use being in alloys and steels. Less than 10% is used in other chemical compounds.

Hard materials

Tungsten is mainly used in the production of hard materials based on tungsten carbide, one of the hardest carbides, with a melting point of 2770 °C. WC is an efficient electrical conductor, but W2C is less so. WC is used to make wear-resistant abrasives, and "carbide" cutting tools such as knives, drills, circular saws, milling and turning tools used by the metalworking, woodworking, mining, petroleum and construction industries. Carbide tooling is actually a ceramic/metal composite, where metallic cobalt acts as a binding (matrix) material to hold the WC particles in place. This type of industrial use accounts for about 60% of current tungsten consumption.

The jewelry industry makes rings of sintered tungsten carbide, tungsten carbide/metal composites, and also metallic tungsten. WC/metal composite rings use nickel as the metal matrix in place of cobalt because it takes a higher luster when polished. Sometimes manufacturers or retailers refer to tungsten carbide as a metal, but it is a ceramic. Because of tungsten carbide's hardness, rings made of this material are extremely abrasion resistant, and will hold a burnished finish longer than rings made of metallic tungsten. Tungsten carbide rings are brittle, however, and may crack under a sharp blow.

Alloys

The hardness and density of tungsten are applied in obtaining heavy metal alloys. A good example is high speed steel, which can contain as much as 18% tungsten. Tungsten's high melting point makes tungsten a good material for applications like rocket nozzles, for example in the UGM-27 Polaris submarine-launched ballistic missile. Tungsten alloys are used in a wide range of different applications, including the aerospace and automotive industries and radiation shielding. Superalloys containing tungsten, such as Hastelloy and Stellite, are used in turbine blades and wear-resistant parts and coatings.

Armaments

Tungsten, usually alloyed with nickel and iron or cobalt to form heavy alloys, is used in kinetic energy penetrators as an alternative to depleted uranium, in applications where uranium's radioactivity is problematic even in depleted form, or where uranium's additional pyrophoric properties are not required (for example, in ordinary small arms bullets designed to penetrate body armor). Similarly, tungsten alloys have also been used in cannon shells, grenades and missiles, to create supersonic shrapnel. Tungsten has also been used in Dense Inert Metal Explosives, which use it as dense powder to reduce collateral damage while increasing the lethality of explosives within a small radius.

Chemical applications

Tungsten(IV) sulfide is a high temperature lubricant and is a component of catalysts for hydrodesulfurization. MoS2 is more commonly used for such applications.

Tungsten oxides are used in ceramic glazes and calcium/magnesium tungstates are used widely in fluorescent lighting. Crystal tungstates are used as scintillation detectors in nuclear physics and nuclear medicine. Other salts that contain tungsten are used in the chemical and tanning industries.

Tungsten oxide (WO3) is incorporated into selective catalytic reduction (SCR) catalysts found in coal-fired power plants. These catalysts convert nitrogen oxides (NOx) to nitrogen (N2) and water (H2O) using ammonia (NH3). The tungsten oxide helps with the physical strength of the catalyst and extends catalyst life.

Niche uses

Applications requiring its high density include weights, counterweights, ballast keels for yachts, tail ballast for commercial aircraft, and as ballast in race cars for NASCAR and Formula One; depleted uranium is also used for these purposes, due to similarly high density. 75-kg blocks of tungsten were used as "cruise balance mass devices" on the entry vehicle portion of the 2012 Mars Science Laboratory spacecraft. It is an ideal material to use as a dolly for riveting, where the mass necessary for good results can be achieved in a compact bar. High-density alloys of tungsten with nickel, copper or iron are used in high-quality darts (to allow for a smaller diameter and thus tighter groupings) or for fishing lures (tungsten beads allow the fly to sink rapidly). Some types of strings for musical instruments are wound with tungsten wires.

Sodium tungstate is used in Folin-Ciocalteu's reagent, a mixture of different chemicals used in the "Lowry Assay" for protein content analysis.

Gold substitution

Its density, similar to that of gold, allows tungsten to be used in jewelry as an alternative to gold or platinum. Metallic tungsten is hypoallergenic, and is harder than gold alloys (though not as hard as tungsten carbide), making it useful for rings that will resist scratching, especially in designs with a brushed finish.

Because the density is so similar to that of gold (tungsten is only 0.36% less dense), tungsten can also be used in counterfeiting of gold bars, such as by plating a tungsten bar with gold, which has been observed since the 1980s, or taking an existing gold bar, drilling holes, and replacing the removed gold with tungsten rods. The densities are not exactly the same, and other properties of gold and tungsten differ, but gold-plated tungsten will pass superficial tests.

Gold-plated tungsten is available commercially from China (the main source of tungsten), both in jewelry and as bars.

Electronics

Because it retains its strength at high temperatures and has a high melting point, elemental tungsten is used in many high-temperature applications, such as light bulb, cathode-ray tube, and vacuum tube filaments, heating elements, and rocket engine nozzles. Its high melting point also makes tungsten suitable for aerospace and high-temperature uses such as electrical, heating, and welding applications, notably in the gas tungsten arc welding process (also called tungsten inert gas (TIG) welding).

Tungsten electrode used in a Gas tungsten arc welding torch

Because of its conductive properties and relative chemical inertness, tungsten is also used in electrodes, and in the emitter tips in electron-beam instruments that use field emission guns, such as electron microscopes. In electronics, tungsten is used as an interconnect material in integrated circuits, between the silicon dioxide dielectric material and the transistors. It is used in metallic films, which replace the wiring used in conventional electronics with a coat of tungsten (or molybdenum) on silicon.

The electronic structure of tungsten makes it one of the main sources for X-ray targets, and also for shielding from high-energy radiations (such as in the radiopharmaceutical industry for shielding radioactive samples of FDG). It is also used in gamma imaging as a material from which coded apertures are made, due to its excellent shielding properties. Tungsten powder is used as a filler material in plastic composites, which are used as a nontoxic substitute for lead in bullets, shot, and radiation shields. Since this element's thermal expansion is similar to borosilicate glass, it is used for making glass-to-metal seals.

How to Make Fishing Jigs 2

Details: Category: Tungsten Information; Published on Wednesday, 27 August 2014 08:56

Then quickly take a pinch of heavy silk, lay it against the cement, and wrap a few turns of the wire around it. Then add cement, lay another pinch of heavy silk against it, and tie a few more turns of wire around the heavy silk.

And Keep doing this until you build up a thick body of heavy silk around the hook, concealing most of it except the point and the barb.

When you have the full amount of heavy silk on the fishing jigs head, finish the jig tying by wrapping the rest of the thread as tightly as possible over the jig. Then end it by tying a series of silk-hitches.

Finally, cover the wire wrapping with a heavy coat of clear quick-drying cement.

how-to-make-fishing-jigs

The followings are the finished fishing jigs with this ways.

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Application of Tungsten Alloy in Military Industry

Details: Category: Tungsten Information; Published on Tuesday, 26 August 2014 15:44

New materials, also called advanced materials, refer to a kind of new materials which have excellent features and functions, and can satisfy the need of high technology. Military new material is used in the field of military, and is the key to make weapons and equipment better. While the military new materials technology is used in the military field of new materials technology, is the key to the modern weapon equipment. Tungsten has the highest melting point in the metal, and its outstanding advantage is high melting point with good high temperature strength and corrosion resistance, the military industry especially show the characteristics of the excellent weapons manufacturing. In the ordnance industry it is used mainly for a variety of penetrator warhead, main battle tank penetrator with large length to diameter ratio, small and medium caliber anti-aircraft penetrator and hypervelocity kinetic energy penetrator with elastic core material.

Tungsten alloy powder through pretreatment technology and large deformation strengthening technology, refining grain materials, elongated grain orientation, improving the strong toughness of the material and the penetration power. Developed by our country main battle tank type 125 Ⅱ penetrator tungsten core materials for W - Ni - Fe, the variable density compact sintering process, the average performance of tensile strength of 1.2 billion mpa, the elongation of 15% above, vowing index is 2000 m distance breakdown 2000 mm thick homogeneous steel armor.

Introduction of Tungsten Sheet

Details: Category: Tungsten Information; Published on Tuesday, 26 August 2014 15:05

Brief introduction:

Tungsten belongs to rare metals and tungsten cost is different according to various tungsten content.

Tungsten sheet is one of tungsten products. Tungsten sheets are produced by good processing property billets and special cold and hot rolling technology. The crystal structure of tungsten sheet is compact.

The difference between tungsten sheet and tungsten plate is that tungsten sheet is thinner than tungsten plate.

Tungsten sheet can be divided into hot rolling tungsten sheet, warm rolling tungsten sheet and cold rolling tungsten sheet.

Due to the resistance to deformation of tungsten is big, the ordinary mill roll can not totally meet the requirements of tungsten sheet rolling. Some tungsten sheet should be rolled by mill roll made of special material. Before rolling tungsten sheet, manufacturers need preheat the mill roll. The preheating temperature is 100 ℃ to 350 ℃ according to the different rolling conditions. If the relative density of the semifinished tungsten sheet (the actual density and theoretical density ratio) is greater than 90%, then manufacturers can machine the tungsten sheet. If the density of the semifinished tungsten sheet is 92 to 94%, the processability of tungsten sheet is excellent. The blooming temperature of hot rolling is 1350℃ to 1500 ℃. If the deformation technological parameters are improperly selected, then the semifinished tungsten sheet will appear lamination. The blooming temperature of warm rolling is 1200 ℃. Hot rolling tungsten sheet with 8 mm thickness can be rolled into 0.5 mm by warm rolling.

Applications of tungsten sheet:

Tungsten sheet can be used to make tungsten electrodes, tungsten heat elements, tungsten heat shields and tungsten boats for electronics, lightening, electro-vacuum industries.

tungsten sheet specification:

designation	process	delivery condition	size(mm)
			thickness
W1	P/M	cold rolled（Y)	0.10-0.20
			>0.20-0.40
		hot rolled®	>0.40-4.0
			>4.0-6.0

Tungsten sheet Impurities:

Grade		W-1
Impurities	Fe	0.002
(%max)	Si	0.001
	Ca	0.0005
	Mg	0.0005
	Ni	0.001
	Mo	0.002
	P	0.001
	C	0.002
	O	0.002
Application		For tungsten alloys

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Tel.: 86 592 5129696; Fax: 86 592 5129797
Email: sales@chinatungsten.com
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Introduction of Tungsten Plate

Details: Category: Tungsten Information; Published on Tuesday, 26 August 2014 14:58

Simple Introduction:

We select high quality tungsten powder and produce good processing property blanks with special rolling technology,and then produce tungsten plate .

So tungsten plate has good processing performance and low content of impurities. The crystal structure of tungsten plate is compact.

Tungsten plate has excellent properties, so tungsten plate is widely applied.

As we all know, tungsten belongs to refractory metal. Tungsten plate is machined on the basis of tungsten. Tungsten plate is featured by high intensity and hardness, good abrasion resistance and excellent comprehensive mechanical properties. Due to these characteristics, tungsten plate alloy is widely applied in cutting tools and mining tools.

In addition, tungsten plate has high melting point and tungsten plate is not easily corroded by air, so tungsten plate is mainly used to make tungsten filament and the high-speed cutting alloy steel, superhard mold. Tungsten plate is also used in optical instrument, chemical apparatuses.

What is more, tungsten plate also can be widely used in metallurgical, chemical, electronic, light source, machinery and other industries.

Applications of tungsten plate:

Tungsten plate is suitable to process ion implantation parts and is used to produce lighting source parts and electro-vacuum equipments. Tungsten plate also is used to make tungsten heat elements and tungsten heat shields for furnace.

tungsten plate specification:

designatioqn	process	delivery condition	size(mm)
			thickness
W1	P/M	cold rolled（Y)	0.10-0.20
			>0.20-0.40
		hot rolled®	>0.40-4.0
			>4.0-6.0

Tungsten plate Impurities:

Grade		W-1
Impurities	Fe	0.002
(%max)	Si	0.001
	Ca	0.0005
	Mg	0.0005
	Ni	0.001
	Mo	0.002
	P	0.001
	C	0.002
	O	0.002
Application		For tungsten alloys

Tungsten weight in tungsten plate is more than 99.95%.

How to Produce Tungstic Acid by Using Tungstate

Details: Category: Tungsten Information; Published on Tuesday, 26 August 2014 14:50

Tungstate is anion containing tungsten acid group (WO4 2-) or poly tungsten acid group (W7O24 6-) salt. Some of tungstate exist in the form of hydrate with a strong alkaline solution, but some are difficult soluble, crystal in tungstate contains discrete tetrahedron structure of ions, slow hydrolysis polymerization in aqueous solution, in acidic solution could be quickly aggregated into more acid salt. Tungstate used as functional materials used as ceramic material, catalyst, pigment, preservative and fire prevention agent, also are a good raw material for producing tungsten acid.

How to produce tungstic acid by using tungstate, first of all, tungstate as raw materials, and heating according to the proper amount of tungsten acid salt in the beaker, when heated to boiling, continue to heat the water in the beaker to join the hydrochloric acid, available to the tungsten acid. Tungstate has fixed the dehydration temperature, finished product is actually made by insoluble in water, except hydrofluoric acid, insoluble in other organic acids. Can be used for the mordant, analytical reagent, catalyst, water treatment agents, making fire prevention, waterproof material, and phosphotungstic acid salt, boron tungstate, etc.

Production Process of Cemented Carbide Ball

Details: Category: Tungsten Information; Published on Tuesday, 26 August 2014 14:11

Cemented carbide ball is a kind of powder metallury products with extrusion and sintering , whose production process is similar to other hard alloy products.

Main technological process is: pulverizing to powder → developing formula according to the requirements of USES → wet grinding → mixing → crushing → drying → filtrating → adding forming agent → drying again → getting the mixtrue after filtrating → granulating → cold isostatic pressing → molding →sintering → molding(semifinished product).

Get blank after the ball, according to specific requirement, semifinished product should be do the process of surface finishing , mainly grinding and polishing. After machining precision, it can achieve the mirror effect.

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