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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: 1951

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: 1985

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 composition, performance

Details: Category: Tungsten Information; Published on Friday, 06 September 2013 18:50; Hits: 2051

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 roller development prospect

Details: Category: Tungsten Information; Published on Friday, 06 September 2013 18:53; Hits: 1958

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 Roll

Details: Category: Tungsten Information; Published on Friday, 06 September 2013 18:49; Hits: 1936

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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