ZXSTEELGROUP
Steel Rail Accessories Use range
Product Overview: Its function is to guide the wheels of the locomotive forward, bear the enormous pressure of the wheel, and passed to the sleeper. The rails must provide a continuous, smooth and resistant rolling surface for the wheels. In the electrified railway or automatic block section, the rail can also be used as a track circuit.
Rail use and use
Heavy rail steel: heavy rail steel is the production of nominal weight greater than or equal to 30kg / m rail steel, China mainly refers to the production of 60kg / m ~ 75kg / m heavy rail (including turnout) use of steel. Heavy rail to withstand the operation of the locomotive vehicle pressure, impact load and the role of friction, so require sufficient strength, hardness and a certain degree of toughness. To adapt to the railway overload, high-speed needs, in addition to increasing the heavy rail of the single, but also improve the overall performance. Requires higher toughness, abrasion resistance, crush resistance and brittle fracture resistance. The quality of the production process is strict, in addition to ensuring its chemical composition, but also requires the test of mechanical properties, drop hammer test and acidification test.
Light rail steel Introduction: is the nominal weight per meter less than or equal to 30kg rail. Light rail quality requirements of the lower than the rail, only to test its chemical composition, tensile strength, hardness and drop hammer test. Main use: Light rail is mainly used for forest, mining, factories and construction sites, etc. laying temporary transport lines and light locomotive lines. Analysis of the rail structure: the cross-sectional shape of the rails with the best bending performance of the I-shaped cross-section, rail head, rail section rail and the bottom of the three parts. In order to allow the rails to better withstand the forces from all sides, to ensure the necessary strength conditions, the rails should have sufficient height, the head and the bottom should have sufficient area and height, the waist and the bottom should not be too thin.
The role of rail
The role of the rail is to directly bear the wheel transmission of the train and the weight of its load, and guide the direction of operation of the train. To 60 groups of 60 tons of gondola cars, for example, the load plus the weight of about 5,000 tons, not to mention those million tons or even tens of thousands of tons of heavy-duty trains. So great pressure first fell on the shoulders of rails, visible rails must have sufficient strength, stability and wear resistance. What shape can the rails be able to shoulder the heavy responsibility? In the years of tireless research and exploration, and finally identified the people now see the I-shaped cross section. Steel section of the I-shaped, from the head, waist, bottom of the three parts of the composition. This seemingly simple work word, good force, the provincial material, with the best bending performance.
The type and strength of the rail are expressed in kg / m. The heavier the mass per meter of rail, the greater the load it receives. The world's first railway rail is 18kg / m, the heaviest rail in the United States, weighing 77kg / m.
China's current rail standard 50kg / m, 60kg / m, 75kg / m three. In order to improve the capacity of the line, China's railway is gradually out of small weight rail, the main line is generally laid 60kg / m or 75kg / m heavy rail.
In theory, the longer the better the length of the rail, both to reduce the impact of the joints and wear, but also reduce the laying of labor intensity. However, due to the constraints of manufacturing and transportation, China's current rail standard length of only 12.5m and 25m two. However, the railway staff took the construction of the standard length of the rail welded rails and "seamless" rails to reduce the joints, so that the line more smoothly. Of course, this is another topic, see "CWR". Rail type, material 1, light rail. Model: 6kg / m, 8kg / m, 12kg / m, 15kg / m, 18kg / m, 22kg / m, 24kg / m, 30kg / m Material Q235B 55Q2, heavy rail. Model: 38kg / m, 43kg / m, 50kg / m, 60kg / m Material U71Mn 50Mn.
