Rail for straight-curve transition section and production method of rail

Abstract

The invention relates to a rail for a straight-curve transition section and a production method of the rail. The rail includes a rail, the rail is provided with three hardness zones from a rail head to a lower jaw area, respectively and namely the first hardness zone, the second hardness zone and the third hardness zone, wherein the first hardness zone is distributed in the middle position of a rail head rolling face, the second hardness zone is distributed from the boundary of the first hardness zone to the rail angle, the third hardness zone is distributed from the boundary of the second hardness zone to a rail head lower jaw, the brinell hardness number in the first hardness zone is 305 HB-340 HB, the brinell hardness number of the second hardness zone is 340 HB-375 HB, and the brinellhardness number of the third hardness zone is 375 HB-410 HB. According to the rail, the defects such as excessive wear, fatigue crack, peeling and chipping on the transition section from a straight line to a curve or from the curve to the straight line can be effectively alleviated, the service life of the rail is significantly prolonged, and traffic safety is significantly improved.

Description

technical field [0001] The invention relates to the field of steel rail production, in particular to a steel rail for a straight-curve transition section and a production method thereof. Background technique [0002] my country's railway construction has now entered a period of leapfrog development, and with the development of ordinary-speed railways towards high-speed and heavy-duty railways, problems such as rail wear and fatigue damage have increased significantly, seriously affecting the service life of rails and driving safety. Ordinary-speed railways are usually a mixture of passengers and freight, the train speed and axle load vary greatly, and the force on the wheel and rail is complex and changeable, especially in the curved section, because the contact point between the wheel and the rail in the curved section is located at the rail angle, the contact area is small, and the wheel and rail The acting stress is large, and it is easy to cause wear and damage. [0003...

AI Technical Summary

Problems solved by technology

[0004] However, on the transition section from a straight line to a curve or from a curve to a straight line, the rail is prone to use defects

Since the wheel-rail contact position on the transition section gradually moves from the rail angle to the tread, or from the tread to the rail angle, in this special section, if the hot-rolled steel rail is used, one end of the connecting curve section will be due to The wheel-rail contact is at the rail angle, the stress is too large, and the hardness of the rail is low, resulting in serious wear; and if a high-strength heat-treated steel rail is used, the end of the straight line section will always be on the tread because the wheel-rail contact, and the hardness of the heat-treated steel rail is relatively high , it is difficult for the wheel and rail to run in effectively to form a conformal contact, the contact stress is at a high level for a long time, and the tread is prone to defects such as fatigue cracks and peeling off blocks

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