Tungsten Information

Microstructure of Rolled and Annealed Tungsten Rod

Published on 23 September 2014

The effect of annealing on the microstructure of the rolled material is also considered. All samples were rolled on a Kocks mill. At low levels of deformation, the grain boundaries are primarily high-angle boundaries, and many grains are dislocation free. Both of these features probably result from dynamic recrystallization during rolling.

As deformation increases, the grains become more elongated, and more low-angle boundaries are found within the material. Also, the potassium gets drawn into narrower and longer tubes. When these rolled rods are annealed at temperatures between 1275 ‡C and 1950 ‡C, several changes occur in the microstructure. The material undergoes abnormal grain growth. The temperature at which this occurs depends on the length of the anneal, the amount of de-formation the rod has received, and the spatial location in the tungsten rod.

This spatial distribution most likely results from strain gradients that exist in the rolled tungsten rod. The abnormal grain growth is accompanied by a decrease in hardness. The potassium-containing tubes in the rod also break up into bubbles during annealing. The temperature at which this breakup occurs again depends on the length of the anneal and the amount of deformation.

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How to Place Fishing Sinkers to the Line 2

Category: Tungsten Information

Published on 23 September 2014

Then wrap the line around the fishing sinker and tie a knot. Make the knot stable, so the fishing sinker does not slide up and down the line. Also, estimate where your hook will be and how much slack you need to retie it to the line. Your fishing sinkers should be close to the hook but does not need to be directly above it.

Then, create individual knots if you determined that you need to use more than one fishing sinker on your fishing line because you want to lower your bait. While it may be easier to simply slide a few sinkers on the line and tie a knot, it may break the line. Repeat the above steps for each individual fishing sinker you use.

Finally, replace the hook that you have removed from the line once you have placed the fishing sinkers securely on your fishing line.

tungsten-fishing-sinkers

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Tungsten Carbide Rod Applications

Category: Tungsten Information

Published on 22 September 2014

The applications of this product is also found in electronic industry as it is Sintered in HIP Furnace and is made of 100% virgin raw material. They are used in making drill bits/end-mills/reamers, as automobile special cutters, printed circuit board special cutters, integral vertical milling cutter, graver etc. In addition, they are used for making of cemented carbide stamping head, core bar and perforation tools. Tungsten carbide bar is the other product of cemented carbide that is mainly used for high standard bearing steels, automobiles, in high-speed railways, for high precision equipment and in high tech weapons.

Tungsten carbide rod with grade of YF06 is suitable for machining composite materials such as aluminum magnesium alloys, carbon fiber, reinforced plastics and iron based alloys etc.. This product id recommended for making big PCB drills of Φ3.2-6.3 mm, micro drills of Φ0.8-3.2 mm micro milling tools and reamers etc.. These tungsten carbide rods come in various sizes and shapes such as tungsten carbide ungrounded rods,precision ground tungsten rods, precision groung tungsten carbide rods, sintered rods with one straight hole.

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Tungsten Carbide Rod Properties

Category: Tungsten Information

Published on 22 September 2014

Tungsten carbide or cemented carbide has many superb characteristics such as high hardness, good strength, good wear and corrosion resistance and salient stability under higher temperatures even at 500°C. It remains unchanged and even at 1000°C attains high hardness. Cemented tungsten carbide as a sintered metallurgical product is in powder form and is manufactured in vacuum or Hydrogen reduction furnace with refractory tungsten material (WC) micron powder as the main ingredient and Cobalt (Co), Nickel (Ni) or Molybdenum (Mo) as the binder. Tungsten carbide rods have the same properties as with any cemented tungsten carbide product.

Manufacturers of tungsten carbide rods usually supply this product with one or two straight holes with a length consisting of 330mm. There are different types of cemented tungsten carbide products of different forms such as solid carbide rod, strip, mill and drill, cutter/tip nozzle, dies and complex parts etc. There are usually three types of cemented tungsten carbide rods such as PCB rod, blank rod and rod. These products with holes are suitable for manufacturing of various kinds of solid cemented carbide tools for the machining of heat-resistant alloys and Ti alloy and suitable for the manufacturing of micro drills used for machining PCB. The holes also play a part in cooling process of machining.

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Tungsten Carbide Rods Types

Category: Tungsten Information

Published on 22 September 2014

Tungsten carbide as a material compound is in huge demand for its very high strength as well as rigidity. Its comprehensive strength is higher than all existing melted and cast or forged metals and alloys. Its compositions range from two to three times as rigid as steel and four to six times as rigid as cast iron and brass. Young's Modulus is up to 94,8000,000 psi. Tungsten base carbides work well up to about 1000 ℉in oxidizing atmospheres and up to 1500℉ in non-oxidizing atmospheres. Tungsten carbide rods maintain all the features of tungsten carbide with availability of different grades.

Tungsten carbide rod with grade of YF06 is suitable for machining composite materials such as aluminum magnesium alloys, carbon fiber, reinforced plastics and iron based alloys etc.. This product id recommended for making big PCB drills of Φ3.2-6.3 mm, micro drills of Φ0.8-3.2 mm micro milling tools and reamers etc.. These tungsten carbide rods come in various sizes and shapes such as tungsten carbide ungrounded rods,precision ground tungsten rods, precision groung tungsten carbide rods, sintered rods with one straight hole. The material used in manufacturing these products is based on ISO K10, K20, K30 and k40f. Manufacturers also undertake orders of non-standard sizes per the customers' specilifications.

The delivery of all standard pressed rods by the mannufacturers is in inch and metric sizes that are susally made available from their existing stocks. Special grades, sizes and shapes are manufactured to customer specifications and delivered on time. The finished or utility ground rod is available in the length up to 12 inches. For the metal producing industry, the manufacturers also produce tungsten carbide roll rings, flattening rolls, slitter knives, hedge trimmers, scrap chopper blades, saws, guides and other parts suitable for use in tough mill environments.

Manufacturers follow the established standards for all tungsten carbide grades and coontrol checks are performed at each operation. They also check the grain sizes and do chemical analysis ti assure that all products conform to the set standards, Test prices are made to determine physical properties of the products for their hardness, transverse rupture strength and density. They also observe for any fractured and polished surfaces through micrographic test with the test results of each lot being recorded before shipping the product to the final customers or users. Some manufacturerd do provide certification of test resuts when asked by the customers

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Tungsten Carbide Rod Introduction

Category: Tungsten Information

Published on 22 September 2014

High purity tungsten rods can be used as heat conductor, additive, crankshaft and cylinder barrel of automobile, parts of heat-resistant steel and electrode. High purity tungsten rods are mainly used in guns, rockets, satellites, airplanes and ships.

Cemented Tungsten carbide is a sintered metallurgical product of powder form. It is manufactured in vacuum or Hydrogen reduction furnace with refractory Tungsten material (WC) micron powder as the main ingredient and Cobalt (Co), Nickel (Ni) or Molybdenum (Mo) as the binder.

Cemented Tungsten carbide has many excellent characteristics such as high hardness and strength, good wear and corrosion resistance and salient stability under high temperature (even at 500 ºC it is essentially unchanged and at 1000 ºC it is still of high hardness). It can be used to cut cast iron, nonferrous metals, plastics, chemical fiber, stainless steel and high Manganese steel, etc., and make drilling tools, mining tools, wear parts, precision bearings, nozzles and metal molds, etc..

Specifications:

Type	Diameter (mm)	Dia. Tolerance (mm)	Length (mm)	Length Tolerance (mm)
PCB rod	3.25 ~ 7	0 / +0.1	12 ~ 40	0 / + 0.2
Blank rod	1.1 ~ 42	---	700 Max	---
rod	2 .0 ~ 25	---	38 ~ 150	---

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How to Place Fishing Sinkers to the Line 1

Category: Tungsten Information

Published on 22 September 2014

If you use light bait such as a worm or an insect, you will find that your hook will float at the top of the water and it is difficult to attract any fish. A popular method of getting your hook to submerge further in the water is to use fishing sinkers. These small metal balls are easily placed on the line and increase your chances of catching a fish. So it is critical to place a suitable fishing sinker onto your fishing rigs, it is so easy that you can do it yourself if you have the necessary things, such as fishing line, scissors and sinkers and sometimes you need a snap swivel.

First remove your hook from the fishing line. You will not be able to place your fishing sinkers without a free end of fishing line to utilize. Use a pair of scissors to trim the hook off your line.

Run a line through one of your fishing sinkers. Most style of sinkers have a hole running through the middle of them. This is for securing it to the line. Thread the fishing line through the hole until several inches worth of line are fed out the opposite end of the sinker.

how-to-tie-sinker-to-line

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Tungsten Alloy Bar Applications

Category: Tungsten Information

Published on 19 September 2014

Tungsten has about the same electrical conductivity and resistivity, coefficient of thermal expansion, and about the same resistance to corrosion by mineral acids as molybdenum. Tungsten is high strength at temperatures above 2,000Â°F, but because the melting point is higher, it retains significant strength at higher temperatures. The elastic modulus for tungsten is about 25% higher than that of molybdenum, and its density is almost twice that of molybdenum. All commercial unalloyed tungsten is produced by powder-metallurgy methods; it is available as rod, wire, plate, sheet, and some forged shapes. For some special applications, vacuum-arc-melted tungsten can be produced, but it is expensive and limited to relatively small sections.

Several tungsten alloys are produced by liquid-phase sintering of compacts of tungsten powder with binders of nickel-copper, iron-nickel, iron-copper, or nickel-cobalt-molybdenum combinations; tungsten usually comprises 85 to 95% of the alloy by weight. These alloys are often identified as heavy metals or machinable tungsten alloys. In compact forms, the alloys can be machined by turning, drilling, boring, milling, and shaping; they are not available in mill product forms because they are unable to be wrought at any temperature.

Typical Applications include weights and counterbalances for aircraft control surfaces and rotor blades, guidance platforms, counterbalances for fly wheels, turbines and engine crankshafts, vibration damping governors, filaments, and fuse masses. Other applications include radiation shielding, gyro rotors, weapons including armor piercing applications, and high temperature tooling.

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Tungsten Bar Physical Property

Category: Tungsten Information

Published on 19 September 2014

Tungsten bar is mainly used to found ingredient of material, cutter and heads, tungsten wire for lights instruments, electric contact points and conductor of heat, crankshaft and cylinder barrel of advanced automobile, ingredient of kinds of heat-resistant steel. Also used for making special steels, to make guns, artillery rockets, satellite airplane and ship. Tungsten bars have a luster rather like that of silver in uniform color. Though the whole tungsten bars may slightly curve, the maximum height of the bend should not be more than 7mm.

The density for W2, W3 tungsten bars is more than 17.5g/cm3.

Measured data for the section grain size of W2, W3 can be provided. If the buyer has any other special demand, it can be discussed on the base of mutual negotiation.

Quality Guarantee: The buyer should take an acceptance inspection on the goods in accordance with this standard in three months from the day of getting the goods. If the inspecting results do not meet the grade criteria set on the Quality Guarantee, the products is still regarded as unqualified after the unsuccessful mutual test.

Package: The products should be package in wooden boxes with inner shaped foam,6-12 pieces and 40kgs max. net each. Transportation: During the transportation, the goods should be moisture proof and clear of violent collision. Storage: Storage place: dry, ventilated, acid & alkali proof, anti-oxidant. The storage time should be limited in six months.

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How to Make Tungsten Gold plated Bar?

Category: Tungsten Information

Published on 19 September 2014

Start with a tungsten alloy about 1/8-inch smaller in each dimension than the tungsten alloy gold bar you want, then cast a 1/16-inch layer of real pure gold all around it. This product would feel right in the hand, and tungsten alloy gold bar would have a dead ring when knocked as gold should. tungsten Gold plated bar would test right chemically, weigh exactly the right amount, and also pass an x-ray fluorescence scan, the 1/16" layer of pure gold being enough to stop the x-rays from reaching any tungsten.The appliances of Chinatungsten tungsten gold plated bar and tungsten alloy fake gold bar as gold substitution.

Tungsten alloy gold bar and tungsten gold plated bar as a gold substitution could be regarded as the special present for some fields. If you are a broker in stock, manager in a big bank or insurance company, you can use Chinatungsten tungsten alloy gold plated bar engraved with your company's name as souvenirs to your VIP customers. It is a very decent present without costing too much, and also could attract more customers for your business.

Tungsten gold plated bar is the best choice if you are a gold dealer and attend some trade fair or put your gold products in the showcase. In case your real gold being stolen, you can choose gold substitution, tungsten alloy gold plated bar to reduce any possible loss.

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