Tungsten Information

Applications of Cemented carbide

Details: Category: Tungsten Information; Published on Friday, 06 September 2013 19:05; Hits: 1828

Medium to coarse WC grain size

Medium to coarse WC grain sizes provide the cemented carbides with a superior combination of high hot hardness and toughness. These are used in combination with CVD or PVD coatings in grades for all areas.

Fine or submicron WC grain size

Fine or submicron WC grain sizes are used for sharp cutting edges with a PVD coating to further improve the strength of the sharp edge. They also benefit from a superior resistance to thermal and mechanical cyclic loads. Typical applications are turning super alloys, solid carbide drills, solid carbide end mills, parting off and grooving inserts, milling and grades for finishing.

Cemented carbide with gradient

The beneficial dual property of gradients is successfully applied in combination with CVD coatings in many first choice grades for turning, and parting and grooving in steels and stainless steels.

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Definition and properties of Cemented carbide

Details: Category: Tungsten Information; Published on Friday, 06 September 2013 19:04; Hits: 1776

Cemented carbide is a powdery metallurgical material; a composite of tungsten carbide (WC) particles and a binder rich in metallic cobalt (Co). Cemented carbides for metal cutting applications consist of more than 80% of hard phase WC. Additional cubic carbonitrides are other important components, especially in gradient sintered grades. The cemented carbide body is formed, either through powder pressing or injection moulding techniques, into a body, which is then sintered to full density.

WC grain size is one of the most important parameters for adjusting the hardness/toughness relationship of a grade; the finer grain size means higher hardness at a given binder phase content.

The amount and composition of the Co-rich binder controls the grade’s toughness and resistance to plastic deformation. At equal WC grain size, an increased amount of binder will result in a tougher grade, which is more prone to plastic deformation wear. A binder content that is too low may result in a brittle material.

Cubic carbonitrides, also referred to as γ-phase, are generally

added to increase hot hardness and to form gradients.

Gradients are used to combine improved plastic deformation resistance

with edge toughness. Cubic carbonitrides concentrated in the cutting edge improve the hot hardness where it is needed.Beyond the cutting edge, a binder rich in tungsten carbide structure inhibits cracks and chip hammering fractures.

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Tungsten Carbide Composite Rod

Details: Category: Tungsten Information; Published on Friday, 06 September 2013 19:02; Hits: 1806

Physical performance: Cemented carbide: HRA90—HRA92 Ma trix: RC30 'owing temperature:910-935 o C Standard Multi-edge particles can be used in the formation of the workpiece surface. For serious wear, with 1/3 of fine particles, need a broad particle size distribution to ncrease density and decrease in clearance of surfacing. Mesh size from 6.35MM-- 325 mesh.

Hardness 90.5 (8%) Shape Polygon in the workpiece surface alloy into distribution. This enables tighter particle inclusions and reduce the gap. Applied to extreme wear and tear. Three sizes: 8-10-16 16 14-20 5mm 8mm Particle shape is gravity cutting most important discovery. Those with sharp points and the sharp edge of particle coating is not good, so that there is a gap between the particles, reduced cutting edge and serious exposure. Gravity cutting alloy particles will have a very powerful cutting or grinding surface. Apply to play grinding, cutting, drilling, sawing, tools. The development of fine grades of coating alloy finds a solution to the problem of hard brittle, no wear-resistant due to softness.

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cemented carbide tips for coal cutter

Details: Category: Tungsten Information; Published on Friday, 06 September 2013 19:01; Hits: 1825

made from 100% virgin raw material; stable and continuous production ability. free online technical service available

Our company is a professional tungsten carbide manufacturer located in Zhuzhou City, the world-renowned research and production base of tungsten carbide. Our company adopted the latest research achievements and advanced experience in carbide materials both at home and abroad.

coal cutter bits:

-- good quality, fair price;-- in gradeYG11C, YG8C , YG6 and YG8;

-- high toughness and wear resistance;

-- sample available;-- prompt delivery.

Application: these carbide buttons can be use for the drilling of oil well, water well and so on.

Physical & mechanical properties of main grades

YG8C: used for the drilling of medium hard and soft rock formation.

YG11C: used for the drilling of hard and super hard rock formation.

So far, our carbide buttons are exported to Germany, USA, India and Mid-Eeast countries, and enjoying high reputation with good qualilty.

cemented carbide tips for coal cutter

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TUNGSTEN / MOLYBDENUM PRODUCTS

Details: Category: Tungsten Information; Published on Friday, 06 September 2013 19:00; Hits: 1917

Tungsten and molybdenum, having high melting point, are used in many industrial fields because of their excellent high-temperature resistance. They are used for electric bulbs filament, discharge-lamp electrodes, electronic bulb components, welding electrodes, heating elements, etc.

Nippon Tungsten produces tungsten powder for raw materials and wires and rods made from tungsten and molybdenum in various shapes according to each application.

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why cemented carbide is it the hardest in metals

Details: Category: Tungsten Information; Published on Friday, 06 September 2013 18:58; Hits: 1858

All the metals we can see have shapes. They are a body and parts of a car, parts of a pencil case, and a screw. They all have the shapes according to applications.

In giving a shape to a metal, the metal must be cut or shaved. The saw or knife used in such a work is the cemented carbide. Therefore, cemented carbide must be the hardest in metals. In addition, the secret of the hardness is that cemented carbide contains hard substance and tough metals that bond the substance. The hard subsistence is tungsten carbide (WC), carbide of tungsten. Diamond made of carbon is as hard as diamond is, and the composite of tungsten and carbon is the second hardest. Tough metals are cobalt (Co) and nickel (Ni) which are the families of iron. These two metals make a hard and strong alloy in combination with each other. The structure of cemented carbide is shown in Fig. 1 below.

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Is cemented carbide hard?

Details: Category: Tungsten Information; Published on Friday, 06 September 2013 18:54; Hits: 1884

What do you imagine when someone asks what cemented carbides is?

You may say, "What is it? I don't know exactly. It sounds very hard. Is it harder han diamond?" What kinds of hard material do you know in our environment? You may think of glass, sapphire, stone, iron and diamond. What is the order of hardness among them? In your elementary or junior high school days, you might try to rub two stones each other and study that one got hurt is the softer. The hardness determined by that method is Moh's hardness. Table 1 shows an example of the hardness. The table also shows other indexes for hardness.

In the table, cemented carbide is classified as degree 9, showing that it is harder than almost all minerals such as sapphire. Among natural minerals, diamond is only harder than cemented carbide, and those in artificial minerals harder than cemented carbide are very few like silicon carbide and boron carbide. Therefore, cemented carbide is not the hardest material. Why is it called "ultra hard" alloy ? That is because it is the hardest in metals.

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Cemented carbide roller development prospect

Details: Category: Tungsten Information; Published on Friday, 06 September 2013 18:53; Hits: 1851

The cemented carbide roller has been used in various areas of metal plastic processing. From non-ferrous metals to steel, cold-rolled foil from hot-rolled wire, pipe, steel, etc. used cemented carbide roller. China is capable of producing dozens of varieties from φ8 ~ φ300mm specifications cemented carbide roller. With wire finishing high-speed (maximum speed up to 130 m / s), the people are exporting methods to improve the strength and hardness of the cemented carbide roller. Which is added a small amount, TaC, NbC and Ni, Cr, Mo, and other elements in the cemented carbide roller; and by hot isostatic pressing, vacuum sintering a low pressure hot isostatic pressing, heat treatment and other means to take better quality roll system.

Chinatungsten Online can provide various sizes and grades of cemented carbide products,deep processing and mold design and production , non-standard products can also be customized according to customer requirements. Welcome to consult and purchase sales@chinatungsten.com .

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Cemented carbide roller composition, performance

Details: Category: Tungsten Information; Published on Friday, 06 September 2013 18:50; Hits: 1938

Cemented carbide roller ingredients with different working conditions due to the roll, even in the same finishing mill, a roll component of the type of rack type. High-speed wire rod mill roll mainly cobalt as a binder carbide roll. Minority continuous casting and rolling mill due to poor water quality using the Co-Ni-Cr cemented carbide roller as a binder, the cost is also lower.

Cemented carbide roller has a high hardness, and its hardness value with temperature change is very small, the hardness value of 700 ° C when the HSS 4 times; also elastic modulus, compressive strength, flexural strength, thermal conductivity higher than tool steel more than doubled. All of these performances are guaranteed cemented carbide roller is better than tool steel roller abrasion resistance and deformation resistance in the working process, thus ensuring a constant finish rolling the roller-shaped groove and size, which guaranteed the surface of the wire quality and dimensional accuracy, is essential. Due to the high thermal conductivity of the cemented carbide roller, so the cooling effect is good, so that the surface of the roll is in a high temperature short time, thereby rolls harmful impurities with the cooling water temperature reaction time is shorter. Therefore, the cemented carbide roller is more resistant to corrosion than tool steel roller resistance to thermal fatigue.

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Cemented Carbide Roll

Details: Category: Tungsten Information; Published on Friday, 06 September 2013 18:49; Hits: 1840

Cemented carbide roller rings (also known as tungsten carbide roll rings), superior performance, quality and stability, high precision machining, good wear resistance and high impact resistance. The cemented carbide roller is a roll made of tungsten carbide and cobalt material by powder metallurgy method. Cemented carbide roller integral and modular two kinds. It was in 1909, after the advent of powder metallurgy technology, with the development of the metal processing industry was born. Since 1918, Germany launched a cemented carbide drawing dies, inspired national cemented carbide, have appeared in a variety of uses roll.

However, the cemented carbide roller a large number of applications in 1960. Morgan (Morgen) first high-speed twist-free wire rod mill was born in 1964, was the finishing speed of the wire increased 4 times. Since finishing mill work in the high-speed, high stress, poor wear resistance of cast iron roll, tool steel roller, rolling groove short life, roll repair handling very frequent, affecting the performance of the mill, were not suited to finishing production requirements, it is to be substituted by composition cemented carbide roller. The world has more than two hundred sets of Morgan mill, the consumption of hundreds of tons of cemented carbide roller.

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