Steel for wear-resistant guide steel rail and production method of steel

Abstract

The invention discloses steel for a wear-resistant guide steel rail and a production method of the steel. The metallographic structure of the steel is a fine pearlite structure, and comprises the following components of, by weight, 0.65%-0.82% of C, 0.60%-1.30% of Mn, 0.70%-1.50% of Si, less than or equal to 0.010% of S, less than or equal to 0.015% of P, less than or equal to 0.5% of Cr and the balance Fe and impurity elements. The preparation method comprises the following steps of molten iron desulphurization, converter smelting, bloom continuous casting, cogging, controlled rolling and controlled cooling. According to the preparation method, a bloom is adopted for continuous casting, and then undergoes cogging to form small billets for rolling, so that the obtained steel rail is uniform in internal structure; the micro-alloy element Cr is added to refine grains, meanwhile, the through quenching performance of the steel is improved, the subsequent accelerated cooling treatment is facilitated, the interlamellar spacing of the obtained pearlite structure is small, so that the tensile strength of the finished product guide steel rail is larger than or equal to 1300 MPa; and the small billets are adopted for rolling, so that the steel billet heating time is short, the surface decarburization is controlled, and the decarbonization layer of the finished steel rail is less than orequal to 0.1 mm. The wear resistance of the wear-resistant guide steel rail is greatly improved compared with the wear resistance of a U75V steel rail which is used in a large scale at present.

Description

technical field [0001] The invention relates to the field of iron and steel metallurgy and materials, in particular to a steel material for a wear-resistant guide rail and a production method thereof. Background technique [0002] The rubber-tyred guideway tram is one of the latest urban public transport vehicles. The vehicle uses rubber tires, and its track is embedded in the ground and guided by a single track. Integrating the advantages of buses and light rails, the wheels have little vibration and no noise when driving at high speed, and the turning radius is small, and the climbing ability is strong. It has the characteristics of energy saving, environmental protection and humanization, and low construction cost. one of the main directions. [0003] The maximum climbing gradient of the rubber-tyred guide rail tram can reach 13°. When the vehicle goes up and down the ramp and turns, the stress on the guiding rail is very large, and the single weight of the guiding rail ...

AI Technical Summary

Problems solved by technology

[0003] The maximum climbing gradient of the rubber-tyred guide rail tram can reach 13°. When the vehicle goes up and down the ramp and turns, the stress on the guiding rail is very large, and the single weight of the guiding rail is only 33kg / m, which leads to the wear of the guiding rail. Soon, the guide rails were embedded under the ground, making replacement and construction difficult, which greatly increased the operation and maintenance costs of the tram line

[0004] Chinese invention patent (application number: 201810959904.5 application date: 2018-08-22) discloses an ultra-high strength and toughness guide rail steel and its preparation method. The patent adopts the composition design of high silicon, high manganese and high cobalt to optimize the structure of the steel. A carbide-free bainitic steel rail is obtained, with a tensile strength ≥ 2500 MPa, but the patented design adds more alloys, the cost is high, and it is not conducive to the welding performance of the rail

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