News & Information
Changsha Customs was informed that since January 1, 2015, customs commodity codes for the six types of carbide products of 8209, the export tax rebate rate from 9% up to 13%. This will Carbide Hunan enterprises to increase export of nearly 20 million yuan net profit this year.
Hunan is an important carbide production and processing bases, the most concentrated in the industrial Zhuzhou Cemented Carbide products direct export enterprises have more than 50, accounting for the city's foreign trade volume more than 50%. Due to the uneven development of production enterprises, Hunan export a wide range of carbide products, product quality is uneven, the applicable commodity codes up to 11 categories of 33 specific tariff, involving sub-0.5% tax rate, 9 percent, 13 percent, 17% and other six grades.
According to customs statistics, exports of carbide products in Hunan last year, $ 74,385,000, of which 90% belong to the commodity code 8209, the implementation of 9% tax rate, the tax rate low end of the ordinary sintered tungsten products export the same.
Tungsten carbide ball applied to hardness and high wear resistance requirements of the occasion, because of its performance is very stable, basically applied to heavy machinery operations. Stainless steel and chromium carbide ball ratio showed a higher intensity, in heavy operations more flexible.
In addition to heavy machinery, carbide ball is also applied to other areas, such as industrial sprayers. Industrial sprays use carbide ball to daily operations. Carbide ball can be used as required to adjust the amount of spray atomizer spray liquid. In short, the nebulizer flow according to the special requirements of the crop to be increased or decreased, this way, the use of carbide ball helps to reduce excessive use of pesticides, to avoid wastage.
In the oil drilling industry, carbide ball also play an important role. After testing, the carbide ball has become a multi-purpose tool can be applied in various industrial fields. The strength of the ball so that it helps downhole hardbanding. Carbide ball can maintain stable pressure, according to the established way to complete the whole job. Therefore, carbide ball has become an important oil industry applications.
| Grade | Compostions(%) | Physical Properties | ||||
| WC | Co | Ni | Density(g/cm³) | Hardness(HRA) | T.R.S.(N/mm²) | |
| YG6 | Balance | 6 | / | 14.6-15.0 | 91 | 1600 |
| YG8 | Balance | 8 | / | 14.4-14.8 | 89 | 1800 |
| YG6X | Balance | 6 | / | 14.6-15.0 | 92 | 1450 |
| YN6 | Balance | / | 6 | 14.5-14.9 | 90 | 1450 |
| YN8 | Balance | / | 8 | 14.4-14.8 | 88 | 1650 |
| YN12 | Balance | / | 12 | 14.0-14.4 | 86 | 1800 |
Processing of Tungsten Carbide Raw Material
When a mixture of powdered tungsten metal and carbon powder are raised to a very high temperature by an arc of electricity, while the whole mass is held in a carbon crucible, there is a complete chemical combination of the two elements to form a big lump of tungsten carbide ( WC ). This lump is crushed several times and then milled to form a fine powder. The powder is screened down to uniform particle sizes. Thus, tungsten carbide raw material is achieved.
Surface carbide ball through different processing technology and the degree can get tungsten carbide blank balls and tungsten carbide polished balls, Chinatungsten Online is able to make the appropriate tungsten carbide ball processing according to customer needs.
Processing of Tungsten Carbide Blank Ball
The Tungsten carbide powder and powdered cobalt metal are mechanically mixed to form a uniform combination. To this combination is added a polymer or wax that acts as a mechanical binder in the pre-sintered stage. A carefully measured volume of this combined powder is compressed by a double acting press to form the tungsten carbide ball blank, or pre-form. The binder is removed by placing the preformed parts in a vacuum chamber and raising the temperature. The binder out gasses and is trapped down stream as a liquid.
Next, the combined tungsten carbide and cobalt pre-forms are sintered or fused into a solid mass by heating them to a high temperature in a vacuum or hydrogen atmosphere furnace. Thus, tungsten carbide ball blank is achieved.
Processing of Tungsten Carbide Polished Ball
The metallurgically complete ball blanks are rough ground with course diamond to remove all imperfections from the surface. Using micro size diamond dust, tungsten carbide ball blanks are then finished lapped and polished to final size and microinch roundness with a sub-microinch surface finish.