With the rapid development of science and technology, whether mechanical industry or microelectronics and even medical fields, all tends to miniaturized and sophisticated. Even the traditional carbide industry is no exception, conventional carbide bar diameter range is generally φ1-40mm. Tungsten carbide rods is also known as tungsten carbide bars, which consists of refractory metal compound as a hard phase and a binder phase metal. Due to its high hardness, high density, high strength and excellent wear and corrosion resistance, it can be widely used in metal cutting tools, drills, grinding tools. But tungsten carbide material is brittle, so there is a great difficulty on tungsten carbide ultra-fine rods manufacturing, which is always a barrier in the development of domestic tungsten carbide industry,

Recent years, some domestic enterprises had a breakthrough in tungsten carbide ultra-fine tungsten carbide rods. In general, in conventional tungsten carbide industry, fabricating diameter of less than 3mm rod is already a certain degree of difficulty. But they through continuous efforts to break through technical difficulties, it is now capable of producing ultra-fine 0.6mm tungsten carbide rods. Throughout the development process, from ingredients, pressing to sintering, each procedure they have to conquer one by one. It requires the use of ingredients when nano-scale particles as a main raw material, and meanwhile pay attention to the ratio of raw materials; the most difficult part is pressing and drying section, due to the mold mouth is very small, conventional extrusion molding agent is hard to achieve extrusion molding. So the relevant researchers updated the recipe of the agent by searching the materials abroad and find the best solution; sintering process is also a part needs precise controlling, due to the small diameter once a parameter error will shrink products uneven, resulting in deformation. Through continuous testing, and finally developed an alternative to imported products for ultra-fine micro-drilling diameter tungsten carbide rods, to break the foreign monopoly on the Chinese market. Currently, tungsten carbide ultra-fine rods mainly used in PCB (Printed Circuit Board) drilling, and the micro-drill by high-speed steel used in dental has been replaced by tungsten carbide micro-drills gradually.

Since Jeong eun kim was in office, earthshaking changes have taken place for the domestic matters in North Korea, gradually he takes the full control of the political situation. He becomes the real master of all states' rights, and it seems to have a tendency to centralization of power. Recently, North Korea is in a time of emergency whose political situation is relatively unstable, therefore, the China made clear regulation for transporting minerals for North Korea. In the April 5, 2016, the Ministry of Commerce of the People's Republic of China published an embargo for partial minerals for North Korea.

Announcement mainly mentioned that import coal and iron and iron ore from North Korean is prohibited. Unless the imports have been proven that they were not produce in North Korean and importers should provide information and application to provincial competent commercial section, after a series of proof then importers can import things. Secondly, it is not allowed to import gold ore, vanadium and titanium ore and rare minerals. There is also a ban on the export of aviation fuel, including aviation gasoline, naphtha type jet fuel, kerosene type jet fuel and kerosene rocket fuel to North Korean, unless it has passed through the UN Security Council Sanctions Committee.

With the rapid development of chinese economy, wolfram heater industry also continues to expand and grow, and since China has been joining the WTO, the export of this industry is gradually increased. Although the past two years, the export situation in China is not optimistic, but in accordance with relevant policy information issued by the State which did not make strict controls for tungsten heater, indicating that wolfram heater still has good investment prospects. What’s more, with the continuous improvement of the national scientific and technological strength, quality and quantity of tungsten heater has been improve, coupled with the reputation "Tungsten City", therefore, tungsten heat would remain the stable development of the state.