In the world, the world's largest exporter of stone , China has become the world's largest exporter of stone. From 1998 to 2002, China's stone exports increased from 4.862 million tons to 9.583 million tons; exports increased from 711.88 million US dollars to 114.277 million US dollars, with an average annual growth rate of 18.5% and 12.6 respectively. %. However, at present, China's stone exports are still dominated by quantity and resources, and the growth of exports is lower than the world average. The average export price of stone units is only 119.2 yuan / ton. From 1998 to 2002, China's stone imports increased from 1.01 million tons to 2.537 million tons; imports increased from 249.49 million US dollars to 442.41 million US dollars, with an average annual growth rate of 10.9% and 15.4 respectively. %, the average import price is $174.4/ton. Most of the stone imported from China is medium and low-grade blocks. Imports are mainly used for the adjustment of varieties. The products are mainly used in joint ventures and higher-grade public places. Last year, the total import and export of stone materials in China was 12.12 million tons, accounting for 44.9% of the world trade volume; the total import and export volume of Chinese stone was 1.585 billion US dollars, accounting for 13.2% of the world trade volume. As China occupies an important position in the world stone industry, international stone merchants attach great importance to China's stone resources and markets, and have invested in mainland China. Fujian, Guangdong, Shandong, Sichuan, Guangxi and other places have established Sino-foreign joint venture stone enterprises. Exports still have potential gaps that cannot be ignored. According to World Bank estimates, the world stone industry will have a faster development in 2003. It is estimated that stone production will reach 80.86 million tons, of which 12 major producing countries will produce about 73 million tons. Dominate 90% of the world's stone production. In 2003, there were 15 major plate consuming countries with consumption above 10 million square meters, of which China was 77.46 million square meters; the United States was 45.8 million square meters; Japan was 36.41 million square meters; Spain was 31.49 million square meters; India 3114 10,000 square meters; Italy 17.38 million square meters. The consumption of 15 major stone consumer countries accounts for more than 80% of the world's total consumption, and the traditional consumption pattern will not change greatly. It is estimated that in 2003, six major stone exporting countries will export more than 1 million tons, including 11.3 million tons in China; 4.56 million tons in Italy; 3.65 million tons in Spain; 2.8 million tons in India; 1.32 million tons in Portugal; Brazil 1.22 million tons. The total export volume of the six countries is about 24.85 million tons, accounting for 89% of the world trade volume. The traditional trade pattern will not change greatly. The main reason for the large export volume of stone in the above six countries is that these countries have precious rare stones in the world. China's vast territory contains a wealth of precious stone deposits. There are stone treasures in the coastal, inland and western regions. Beijing, Fujian, Xinjiang, Inner Mongolia, Guangxi, Yunnan, etc. are the main producing areas of precious stones, which is to develop the stone industry and expand Stone exports provide the most fundamental guarantee. The advantage of Chinese stone exports is that there are many precious varieties, wide distribution, low production cost and good quality. However, it is still widespread that the prices of export products are small and cannot meet the requirements of foreign businessmen for large and large pieces, so the prices on the international market are relatively low. In addition, the products exported are not able to keep up with the development trend of the world in terms of color and color. At the same time, due to the influence of transportation, climate and mining conditions (water, electricity, machinery, talents, technology) in remote mountainous areas, a large number of production and exports are restricted. At present, there are more than 3,000 enterprises in China that have large-scale stone mining and stone processing. The processing enterprises have basically achieved mechanization. Most of the mining enterprises are semi-mechanized production, but the level of stone mining and processing in China is still at a certain distance from the international advanced level. Due to the smaller volume of mining stone blocks, the waste of resources is more serious. At present, the volume of stone blocks mined in Italy, Spain and other countries is generally above 7 cubic meters to 10 cubic meters, while the volume of China's mining stone blocks is mostly only 2 Below cubic meters. The stone industry is expected to develop at a high level. China's economic growth rate is expected to reach 7% in 2003, which will effectively promote the development of China's stone industry. According to conservative calculations, China's stone output can reach more than 20.5 million tons this year; the export volume can reach more than 10 million tons; the export volume can reach more than 1.14 billion US dollars, and the output, consumption and trade volume of Chinese stone will continue to be the world's number one. one. Some analysts believe that although there are some problems in China's stone industry, it still has the basis and conditions for high-level development. First, China's stone resources are rich and diverse, and stone resources are spread all over the country. Compared with international stone developed countries, China's stone resources have obvious advantages. Second, China's annual stone consumption has ranked first in the world, and domestic consumption has become an important factor driving the continuous development of the stone industry. In particular, Beijing's bid to host the Olympic Games and Shanghai's bid to host the World Expo will be successful. The country's active fiscal policy of stimulating domestic demand and the start of various new projects and renovation projects will create more favorable conditions for the development of China's stone industry and access to the international market. Third, from the perspective of the international market, the growth rate of stone is higher than the growth rate of the world economy. It is expected that the annual growth rate of world stone will still reach 6% in the next 20 years. Therefore, China's stone exports have reasons to be optimistic.
High Resistance Alloy is used to produce resistance elementof conductive material.Requirements including High mechanical strength, good corrosion resistance and oxidation resistance. Working temperature is usually at500 ℃. Commonly used with constantan chromium iron, iron chromium aluminum, nickel chromium, nickel, resistivity rho (20 ℃) is 1 Ω was/m or so. It is not used in the conduction of current, but with its high resistance to limit or control the current in the circuit, such as motor, potentiometer, standard resistors, potentiometers, slip line resistor resistance element and resistance line, etc.; For the using of high resistance in the pressure sensor,Temperature compensator and temperature measuring resistor of resistance element to creatte reflect strain, temperature, magnetic field and parameters; High resistance alloy can also be used as heating elements in the manufacture of the resistance heating equipment, could be applied in current, voltage regulating and the winding of control components.
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