Ultralow-yield-ratio steel applied to single-rail turnout junction and production method of ultralow-yield-ratio steel

Abstract

The invention discloses ultralow-yield-ratio steel applied to a single-rail turnout junction. The ultralow-yield-ratio steel comprises the following chemical elements in percentage by weight: 0.02% to0.16% of C, 0.15% to 0.50% of Si, 0.80% to 1.80% of Mn, 0.004% to 0.015% of P, smaller than or equal to 0.005% of S, 0.010% to 0.050% of Nb, 0.008% to 0.020% of Ti, 0.25% to 0.45% of Ni, 0.40% to 0.60% of Cr, 0.25% to 0.45% of Cu, 0.015% to 0.050% of Al and the balances Fe and inevitable impurities. According to the ultralow-yield-ratio steel disclosed by the invention, a structure consisting ofsoft-phase ferrite and hard-phase pearlite of which the crystal grains are moderate in size is obtained by utilizing a tempering process, and thus an ultralow-yield-ratio steel plate applied to the single-rail turnout junction is obtained.

Description

technical field [0001] The invention relates to a very low yield ratio steel for a single track turnout and a production method thereof. Background technique [0002] The straddle-type monorail transportation has the characteristics of less land occupation, low noise, less shading of light, and strong ability to adapt to terrain. The new light rail line newly built in Chongqing is the first time in my country to adopt straddle monorail technology. The turnout structure and operation control mode in the straddle monorail system are completely different from the conventional wheel-rail transportation system, and it has complex composition and various forms. [0003] The basic composition of the single track turnout In order to ensure the safety and stability of the train during the line transfer process, the straddle type single track turnout adopts a beam structure similar to the track beam, which is composed of a group of steel box girders connected with each other and rota...

AI Technical Summary

Problems solved by technology

However, the turnout steel in this patent is a high-strength, high-carbon, high-silicon, and high-chromium composition design. Although the heat treatment method is used to improve the uneven performance caused by the uneven grain size caused by composition segregation, the process method Multiple heating and heat preservation treatments are required. This method is not simple and easy, and it is not conducive to high-efficiency organization of mass production

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