Light Steel Rail Mainly divided into

The steel rail steel rail steel developed by the world is divided into three main categories, namely, carbon steel, Taiwan steel and heat treatment steel. According to its metallographic structure, the fork can be divided into three types: pearlite steel, bainite steel and martensitic steel. These types of rail steel have their own characteristics, and carbon steel production costs are the lowest, but their metallographic tissue is a larger pearlite, so its strength and toughness are not ideal. Alloy rail steel is to use elements such as manganese, chromium, molybdenum and vanadium to increase its strength, improve its toughness, can obtain refine pearlite structure, it is better than carbon confused is the comprehensive mechanics performance of rail steel, but the welding performance than steel, carbon steel and the production cost is high; Rail steel heat treatment mainly through heat treatment to obtain fine pearlitic structure, so far, the world is generally believed that this is the best comprehensive properties of rail now make rail quality detection technology to achieve a higher shuicheng steel, but its heat treatment equipment investment is large.

With the continuous and rapid development of China's economy, the development of railway transportation has been promoted and the speed of train running has become the main direction of railway transportation development. The increase of train speed, compared with the ordinary railway, the use of high speed railway rail more harsh conditions, the high-speed rail by rail material should have "high purity, high strength, high toughness, high precision and good weldability", which realizes the high speed railway rail steel "high purity" is a new task faced by the steelmaking technology research.

At present, both domestic and international steel rail steel production adopts LD - LF - RH (VD) - CC process flow. Foreign advanced rail steel production technology has reached a very high quality level, inclusions in steel and the continuous casting slab defect are to very low levels, completely accord with the requirement of EN standard, the so-called "zero defect rail". Transformation of domestic steel production enterprises through in recent years, has established a world-class equipment level of the production line, the rail steel internal quality also achieve a good level, the rolling rail satisfies the requirement of 200 km/h high-speed rail technology and has launched, but compared with the technical index of the 350 km/h, there is still a large gap, according to a 2004 under the condition of the original process at pangang 2 ~ 5 month production of rail steel material quality, research shows that under the condition of the original process conforms to 350 km/h high-speed rail steel purity control requirements of the percent of pass is only 48.21%, the main problem on the control of non-metallic inclusions.