Since the beginning of this year, the construction of high-speed railway in China has been spreading. On July 9, baoji, which was built along the silk road, was opened to traffic in lanzhou. The high-speed line travels through the loess plateau, which took more than four years to build.We have been paying close attention to the excellent manufacturing enterprises of grun, which is a rectangular tube, galvanized pipe, welded pipe, straight pipe and other products. In recent years, the development of high-speed railway has become a highlight of China's economic development. Although China officially opened its first high-speed railway in 2008, it took less than 10 years for China to be number one in the world.According to statistics from the national bureau of statistics, by the end of 2016, the total length of China's high-speed railway reached 2.20 million kilometers, accounting for more than 60 percent of the total length of the world's high-speed railways.Since the beginning of this year, the construction of high-speed railway in China has been spreading. On July 9, baoji, which was built along the silk road, was opened to traffic in lanzhou. The high-speed line travels through the loess plateau, which took more than four years to build. On August 24th, the longest railway tunnel of the qianchang railway -- the wuling mountain tunnel was successfully completed. The wulingshan tunnel in this route is located in zhangjiajie city, with a total length of 9.04km. The qianchang railway planning line, which has a total length of 340 kilometers and a speed of 200 kilometers per hour, is scheduled to open to traffic in 2019.In the five years since the 18th national congress of the communist party of China (CPC), the construction of high-speed rail has been five years since the 18th national congress of the communist party of China (CPC). This period is the most significant period for the construction of railway construction and the most new line in the history of railway construction. Been in our country has formed an initial horizontal "high-speed rail network (" been" include: the beijing-shanghai high speed railway, about 1318 km, the design speed of 350 kilometers, has officially opened on June 30, 2011 operations. The beijing-hong kong passenger line, with a total length of 2,440km and a design speed of 350km/h, is expected to be completed and opened in the third quarter of 2018. The remaining paragraphs are fully operational in 2016. With a design speed of 350 kilometers per hour, the beijing-kazakhstan passenger line, with a design speed of 350 kilometers per hour, has been fully operational in 2013.The 1464km hangzhou express passenger line has been fully completed and opened to traffic in 2013."Four horizontal" includes: xulan passenger special line, the total length is about 1606km, the design speed is 250km ~ 350km, in July this year has realized the whole line operation; The shanghai-kunming high-speed railway, 2252 km long and designed with a speed of 300 kilometers to 350 kilometers per hour, is the longest high-speed railway line in China's east and west, which was opened to traffic at the end of December 2016. The qingtai-passenger special line, which is about 906 km long, connects east China and north China, with a design speed of 200km ~ 250km/h, which is expected to be completed by the end of 2018.The shanghai-hanrong high-speed railway, which connects the southwest and east China regions, has been completed in July 2014, with a design speed of 160km ~ 350km/h and has been completed in July 2014. The high-speed rail network is expected to be completed in 2018.In the future, China's high-speed railway construction and development space is still very large, and the demand for steel will continue to grow.At present, the high-speed rail is an all over the country: in May, in its network of guangdong province "much starker choices-and graver consequences-in planning is put forward, by 2020, at a high speed railways as the backbone of railway network basic formation, high speed railway mileage of 2000 kilometers, realize the city iron intake, with all the land neighboring provinces (districts) have a high-speed rail link;Jiangsu province this year will complete the railway investment 40 billion yuan, up 16% from a year earlier, and "three vertical and four horizontal" high-speed rail network in jiangsu will be fully formed, at the end of "much starker choices-and graver consequences-in" railway total mileage reached 4000 kilometers, of which about 2000 km of high speed railway; Henan province will accelerate the formation of the "rice" high-speed railway network during the 13th five-year plan period, and the mileage of high-speed rail will exceed 2,000 kilometers. Hebei province proposed that the high-speed railway operation mileage will reach 2,000 kilometers, covering all districts. At the national level, on July 20 last year, the national development and reform commission (NDRC) officially announced China's long-term railway network planning (2014 adjustment) (hereinafter referred to as the plan). The plan is clear that by 2020, the total mileage of China's high-speed railways will reach 30,000 kilometers.By 2025, the total length of the high-speed railway will be about 38,000 km. The length of China's long-term railway network will be about 200,000 km, with high-speed railway mileage of about 45,000 kilometers.Future will be built in our country "eight vertical and eight horizontal" high-speed railway network, in the main building with "eight vertical and eight horizontal" main skeleton, regional connections, the high-speed rail network of inter-city railway added."Eight longitudinal channels including coastal channel, the beijing-shanghai, Beijing port (Taiwan) channels, Hong Kong and Macao regions - Beijing, call nantong way, of passage, package (silver) haitong, wide orchid (west) channel; The "eight horizontal" channels include suiwan passage, jinglan channel, qingyin passageway, land bridge channel, riverside passage, shanghai-kunming channel, xiu yuanyu channel, guangkun channel. High-speed rail paved a huge "steel need to be" conservative estimates, according to concerning an expert 1 the design speed of 250 kilometers of the passenger dedicated line, the construction cost of investment in 087 million yuan per kilometer, is expected to 2017 ~ 2020 year our country new high-speed rail investment scale is about 696 billion yuan. The number of new high-speed rail investment in 2017 ~2025 is about RMB 1392 billion.The new investment in high-speed rail between 2017 and 2030 will be about 2001 billion yuan. According to statistics, the amount of steel consumption per 100 million yuan of railway infrastructure has risen from 0.32 million tons in the previous years to 0.333 million tons.Based on this calculation, the steel consumption of the new high-speed rail construction will reach 66.60 million tons by the end of 2017. At present, our country enterprise has been contracting for more than 50 countries and regions of the railway construction project, railway equipment and parts have also been throughout Asia, Africa, Oceania and the americas and so on more than 50 countries and regions, including the United States, Russia, Brazil, India, Saudi Arabia, Turkey, Poland, venezuela, Burma, Cambodia, Laos, Thailand and other dozens of countries hope to strengthen and in high speed railway in our country and the common exchanges and cooperation in the field of railway. China's high-speed rail project is also under way. On April 4 this year, China high-speed railway went out for the first project - Indonesia's Jakarta to bandung high-speed railway project contract was signed in Jakarta. According to the national development and reform commission spokesman, thousands of high-speed rail in western Java, connecting the Indonesian capital Jakarta and bandung, west Java province provincial capital, a total length of 142 km, is expected to open to traffic in 3 years. The high speed railway construction is speeding up the development of high-speed railway construction in China, which requires higher requirements of steel grade and quality. It is understood that China's high-speed railway construction project, infrastructure and locomotive manufacturing in investment is larger, and the purchasing of raw materials and spare parts, and occupied a large part of them. Therefore, the demand for iron and steel materials for rail materials and locomotives is huge, involving rails, railway elastic components, railway fasteners, waterproof materials, and axle and wheels. At the same time, the stations, tunnels, Bridges and other projects also need to use the screw steel, wire and so on. It is understood that the steel projects are mainly divided into the following categories. First, the wiring infrastructure USES steel. Common in the construction of high-speed ballastless track sleeper is composed of concrete casting, without gravel subgrade, sleeper track directly laid on the concrete, so the engineering materials (ordinary steel, low relaxation prestressed steel strand, etc.) it is difficult to meet high railway construction requirements, and the intensity of need higher more specifications and low relaxation prestressed steel wire, PC steel bar (prestressed concrete with steel rods), gao qiang HRB500 steel bar. At present, China mainly USES 60kg/m and 75kg/m weight rail in the course of rail construction. Than Bridges in high-speed rail construction project was very large, has higher requirements to the performance of steel, steel yield strength level from 370000000 mpa to 420000000 mpa, in order to reduce weld and node, and need to bridge is made of super wide super thick, high strength plate (thickness of 50 mm ~ 68 mm). The second is the vehicle body steel, the high-speed railway locomotive steel is divided into stainless steel, aluminum alloy, carbon steel and weathering steel. In CRH (China railway high-speed) series of trains, except for CRH1 in stainless steel vehicles, CRH2, CRH3, CRH5 and other high-speed trains are all used in aluminum alloy body. Considering the weight of vehicles, speed of travel, service life and maintenance costs, carbon - steel and weather-resistant steel vehicles are now rarely used. Three is wheel steel, the wheel is the key to guarantee high-speed train running parts, train operation speed is faster and faster, the quality of train wheels is higher, its cleanliness, strong toughness and wear resistance of steel and rolling technology, test conditions have very high requirements. At present, the localization and promotion of the wheel, axle, bearing box, spring and other components of the steering frame and its key components are the key work of China's independent innovation of steel. Four is passenger station steel, high speed rail station of the large span steel structure, wide application of advanced steel varieties, medium thickness plate (plate) accounted for about 50% of the above, hot-rolled h-beam accounted for about 15%, caitu (galvanized) accounted for about 12%, pipe accounted for about 3.5%, other sections and cold bending steel accounts for about 19%. General requirements of steel with high strength, high toughness, weldability, and earthquake, lamellar tearing resistance, fireproof, weather resistance and other properties, so narrow high strength steel, weathering steel, yield strength, lightweight steel thin-wall h-beam, TMCP (thermal mechanical control technology) type high toughness ultra wide varieties of h-beam is focus on research and development and production. The next few years will be the golden development period of China's high-speed railway and a period of significant increase in steel consumption. Large amount of high speed railway construction steel and many varieties, high quality requirements, steel upgrading characteristics significantly, iron and steel enterprises should seize the historical opportunity, key high-end needed to achieve high speed railway engineering to contribute to the localization of steel varieties, their duty.