With the global economic development and industrial recovery, the business cycle of rail transit industry is in a new phase of rising. With increasing energy crisis and increasing environmental pressure, green rail transit will become the preferred mode of transportation in the world, and the rail transit industry will start a new cycle of rapid development in the world.

    There are various kinds of rail transportation casting, accounting for about 5% of the total castings in China. Related products mainly for motorcycles, trucks, trains, and in the domain of urban rail equipment supporting the need of mechanical transmission gear box, high-power diesel engine, bogie bolster and side frame, frame, damping device, coupler buffer, traction motor, disc brakes, brake clamps, axle box, such as key bearing components, products with high technical requirements and manufacturing is difficult, mainly small and medium-sized pieces of various modes of casting material and the safety and reliability of the product is directly related to public safety. Therefore, the importance of castings in rail transit industry is self-evident.

    According to the statistical analysis of China foundry association's rail transit foundry branch, the market demand for rail transit castings is expected to remain unbalanced in 2018. At present, the domestic passenger transport sector is increasingly relying on high-speed trains, and the demand driving force of goods vehicles and locomotives is the macro economy and freight volume. With the increase of subway mileage, the demand for subway cars is increasing year by year, and it is getting a blowout. The detailed analysis is as follows:

Moving car plate: the market demand appears upward inflection point.

    2016 mu trains the tender number only about 110 standard column, 1 ~ 11 months in 2017, China railway corporation bidding 205 standard column, up 86.4% from a year earlier, the main benefit from the "neighbourhood" policy stimulus, pull the sustained growth overseas orders. In 2017, mainly production train vehicles related casting enterprise is particularly busy, such as car qi shuyan locomotive vehicle technology research institute co., LTD in the emu aluminum alloy gear case in historical peak, mainly production casting traction motor of zhuzhou nine square casting co., LTD always strive to get the orders.

    In terms of the future development situation, the increase of the new traffic mileage of mobile vehicles will increase the operation density, and the demand for moving cars will be turned upward. 2016 countries issued a "long-term railway network planning", by 2020 China's high-speed rail mileage will reach more than 30000 kilometers, by 2025 China's high-speed rail mileage will reach more than 38000 kilometers. In terms of construction progress, China's high-speed railway mileage has increased rapidly in the next three years compared with 17 years. Among them, 2017 is the low point, which starts to increase rapidly in 2018, which will bring the demand of rail transit equipment to the bottom. At that time, the driving gear box, car hook and buffer, brake disc, clamp, axle box body, positioning rotating arm, traction motor and other casting product order demand will rebound quickly.

    In addition, the acceleration of inter-city railway investment has become one of the main driving forces for the demand growth. According to the national development and reform commission in December 2015, the ministry of transport, release the urbanization region comprehensive transportation network planning, by 2020, China's new intercity railway about 8000 km, covering 98% of the node cities and nearly 60% of the county (city). If the operating density of the motor vehicle is 0.9 vehicles per kilometer, the additional 8,000 km of intercity rail will bring the demand for the motor vehicle to 7,200, corresponding to the 900 standard column, and the average annual demand is 180 standard columns. It is important to note that the launch of the freight train group is expected to be a significant increment in future demand for mobile vehicles.

    Metro section: expected to grow by more than 20%.

    As the mileage of subway trains increases year by year, the demand for subway cars will increase year by year, and the growth rate is expected to be more than 20% in 2017. There is a great improvement in the demand for the casting market orders such as rail, light rail, monorail, urban fast track, magnetic levitation, modern tram, etc.

Truck plate: officially announces the recovery of the market recovery.

    In 2016, a total of 25,272 goods vehicles were invited, officially announcing the recovery of the truck market. On January 19, 2017, China railway corporation launched the largest truck bidding in the country since its establishment, with a total of 40,000 vehicles, a 58% increase over the whole of 2016. This tender purchase NX70A model Shared flat car and X70 container special flat car each 20,000 units. At present, the rail transit casting branch is mainly engaged in the production of truck parts, and large-scale truck orders bring vitality to many member units.

    Locomotive plate: tendering and delivery volume increased obviously.

In 2016, due to the impact of the slowdown of the tendering process in iron, there were only over 100 vehicles delivered for the whole year, and in 2017, the demand for locomotives increased significantly with the increase of truck bidding and delivery. According to the statistics, on January 26, 2017, China railway corporation issued a tender notice to tender 586 passenger and freight electric locomotives, including 495 freight electric locomotives and 91 passenger electric locomotives. On November 3, 2017, China railway corporation bidding 160 km/h (6 axis 7200 kw) ac drive passenger locomotive, December 11, 2017, in the qi shuyan and iron company signed a 4400 - horsepower car ac drive diesel locomotive shunting procurement contracts, models for HXN5B type, the number of 30. With locomotive machinery transmission gear box, traction motor casting, brake disc and other main business locomotive and low-speed passenger car parts foundry enterprises also have a breathing machine.

    Considering the current situation, the rail transit equipment industry will continue to grow by 15% to 20% over the next three to five years. The annual increment of the motor vehicle group is expected to remain in the 300-400 columns for a long period of time. The market size is 60 billion to 80 billion yuan, and about 2,560 tons of castings are needed each year.

    The railway train is expected to have an average demand of 70,000 to 80,000 vehicles, with an average of 6 tons of supporting castings per truck and 480000 tons of castings per year. The locomotive is expected to demand 700~1000 vehicles a year. According to the average of 10 tons of supporting castings for each railway locomotive, the railway locomotive industry needs about 10,000 tons of casting each year.

Railway passenger cars, car ownership is expected to remain 4% growth, the annual demand is expected to about 7000 or so, average use 1.5 tons per railway passenger train supporting castings, railway passenger car industry needs casting 10500 tons a year.

    Will usher in the next five years, urban rail transit, the future a long period of time is expected to maintain sustained growth in 2500 ~ 3000 per year, per urban rail vehicles, on average, 1.5 tons of form a complete set of the casting is used to calculate, urban rail vehicle demand castings 4500 tons per year.

2018: focus on the following technical difficulties.

    In terms of technological innovation, the following tasks will be focused on in 2018:

First, China has set up a casting expert group to jointly tackle the problems in the development and production of rail transit casting. In casting simulation technology to organize joint research, in the prediction of defects is more comprehensive, reliable, and from the analysis of the traditional shrinkage defects, extended to the analysis of external defects such as slag, crack, cold insulation, even can predict the microstructure and mechanical properties, in the end of our performance evaluation on the use of the products. In dry waste processing, intends to develop more in-depth technology research, joint propulsion solve the steel rail transit sodium silicate-bonded sand wet regeneration process circulating water issues and the residual sodium (Na) of the problem of dry rail steel overall utilization problems of core sand, sand rail transport all kinds of thin wall casting iron than the problem, and expands the coated sand casting, lost foam casting workshop etc in the application scope of rail steel.

    Second, the combination of 3D printing technology and traditional casting technology. 3 d printing to quickly implement process from design to production, reduce the intermediate links, to speed up the product development cycle, reduce cost, rapid development sheet especially for new products or small batch complex castings production. Main attack direction: one is the direct sintering of coated sand or ceramic powder to make sand or sand core for gravity or low pressure casting; The second is the sintering polymer plastic or paraffin material, and the metal parts are made rapidly by the method of investment casting.

    Third, the development and application of new cast steel and cast iron materials. In terms of new cast steel material and technology, it is necessary to develop high strength and toughened cast steel materials and manufacturing process research in order to solve the inertial quality problem of carb hook and tongue crack. For engineering mechanical wear-resistant steel wear-resistant parts such as harrow board, dao picks the characteristics of the wear resistance is low, therefore to develop new material with high wear resistance and high toughness steel casting technology research, developing new high wear-resisting cast steel material, improve the wear resistance and service life of wear products; The key for the emu cast steel brake disc and other cast steel parts for the castings ontology the status quo of inclusion and gas content lower, intermediate frequency furnace steel purification and preparation of high purity steel materials, reduce the gases in the molten steel and inclusion content, improve steel quality, ensure product quality and performance within; In the development of new cast iron material and process, the development of new type cast iron material and manufacturing process is carried out to develop new high performance ductile iron material and expand its application scope. The development of new low temperature and high performance iron material and manufacturing process, improve service performance of low temperature resistant ball iron, and expand its application field; The mechanical properties and application properties of various alloying cast iron have been studied, which has expanded the application range of cast iron materials and provided basic support for the replacement of various kinds of railway castings.

Fourth, the higher strength grade of aluminum alloy castings and high strength magnesium alloy material technology research. As rail transportation equipment towards the direction of high speed, energy-saving, safe, comfortable, performance and quality of casting aluminum alloy products put forward higher requirements, at the same time of lightweight and pursuit of alloy high strength and elongation. However due to the casting process performance is poorer, Gao Jiangren casting Al Cu alloy and magnesium alloy applications in the field of rail transit is almost blank, also need to improve in 2018 Al Cu alloy and magnesium alloy casting performance and two new casting technology breakthroughs.

    Fifth, the research and development of aluminum matrix composite brake materials. Aluminum matrix composites with high specific strength, specific stiffness and good high temperature mechanical properties and low expansion coefficient and good wear resistance, the orbit transportation, aviation, aerospace, automobile and other industries has very broad application prospect, is the current hot topics in the study of metal matrix composites, it is also the new direction for the development of casting aluminum alloy. Made of aluminum alloy composites for rail transit with the brake disc, can lose weight by 50% ~ 60%, reduce the inertia force, increase the braking acceleration, improves the heat conduction speed, reduce the wear and tear, thus improving the performance of the brake disc. At present, the research on the brake disc of the aluminum matrix composite material is being carried out jointly with the Australian group.

    Sixth, in the face of national environment increasingly serious pollution and the host clients to enhance consciousness of high iron and high standard requirements, coupled with rising raw material prices, 2018 rail transit casting enterprise must continue to deepen the lean management, cohesion mass transfer efficiency. Continue to implement green casting and intelligent manufacturing, smelting, casting, polishing and surface treatment for the transformation and upgrading of equipment and facilities, the detailed process control and lean management, to establish risk prevention system of casting defects, quality cost optimization and balance, create a rail transit casting brand value.