Railroad 38kg 43kg 50kg 60kg 75kg GB Standard Heavy Rail

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There are heavy rails, light rails, and lifting rails in the rails. The difference between heavy rail and light rail is that the weight per unit length of the rail is different. Rails weighing more than 30kg per meter are called heavy rails; rails weighing less than 30kg per meter are called light rails. Generally, heavy rails are mainly used on railway tracks, and hoisting rails are mainly used in lifting cuttings.

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The light rail is mainly used for laying temporary transportation lines and light locomotive lines in forest areas, mining areas, factories and construction sites. Material: 55Q/Q235B, executive standard: GB-89.

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First, countries have followed such a principle in the design of the rail head tread: the arc of the rail top tread conforms to the size of the wheel tread as much as possible, that is, the size of the tread arc, such as the 59.9kg/m rail in the United States, the rail head arc is adopted R254-R31.75-R9.52; the 65kg/m rail of the former Soviet Union, the rail head arc adopts R300-R80-R15; the UIC 60kg/m rail, the rail head arc adopts R300-R80-R13. It can be seen from the above that the main feature of the section design of the modern rail head is the use of complex curves and three radii. On the side of the rail head, a straight line with a narrow top and a wide bottom is adopted, and the slope of the straight line is generally 1:20~1:40. A straight line with a large slope is often used at the lower jaw of the rail head, and the slope is generally 1:3 to 1:4.

Second, in the transition zone between the rail head and the rail waist, in order to reduce the cracks caused by stress concentration and increase the frictional resistance between the fishplate and the rail, a complex curve is also used in the transition area between the rail head and the rail waist, and a large radius design is adopted in the waist. For example, UIC's 60kg/m rail uses R7-R35-R120 in the transition zone between the rail head and the waist. Japan's 60kg/m rail uses R19-R19-R500 in the transition zone between the rail head and the waist.

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