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A platform for research: civil engineering, architecture and urbanism
High-toughness bainite steel rail and production method thereof
The invention discloses a high-toughness bainite steel rail and a production method thereof. The room-temperature Charpy impact absorbing energy of a rail head of the steel rail is larger than 100 J, and the room-temperature Charpy impact absorbing energies of a rail waist and a rail bottom are both larger than 90 J. The method comprises the following steps: on-line heat treatment: when the temperature of the top surface of the steel rail after finish rolling is at a first preset temperature, respectively cooling the top surface of the steel rail, two upper fillets of a rail head and two side surfaces of the rail head at a preset cooling speed, and performing air-cooling to room temperature after the temperature of the top surface of the steel rail is at a second preset temperature; and tempering heat treatment: placing the steel rail cooled to the room temperature in a stable temperature environment, performing tempering heat treatment, and cooling the steel rail to the room temperature after the tempering heat treatment. The obtained high-toughness bainite steel rail has excellent rail web and rail bottom room-temperature impact toughness, and the bainite steel rail with high toughness in the whole section can be obtained by controlling the chemical components of the steel rail, an online heat treatment process and a tempering heat treatment process under the condition that various microalloy elements do not need to be added massively.
本发明公开了一种高韧性贝氏体钢轨及其生产方法，钢轨轨头的室温夏比冲击吸收功＞100J，轨腰、轨底的室温夏比冲击吸收功均＞90J。包括在线热处理：待终轧后钢轨轨顶面温度在第一预定温度时，以预定的冷却速度分别对钢轨轨顶面、轨头两上圆角、轨头两侧面进行冷却处理，至轨顶面温度为第二预定温度后空冷至室温；回火热处理：将冷却至室温后的钢轨放置于稳定温度环境下进行回火热处理，回火热处理后将钢轨冷却至室温。本发明得到的高韧性贝氏体钢轨，具有优秀的轨腰、轨底室温冲击韧性，通过控制钢轨化学成分、在线热处理工艺和回火热处理工艺的方法，在无需大量添加多种微合金元素的情况下即可获得全断面均具有高韧性的贝氏体钢轨。
High-toughness bainite steel rail and production method thereof
The invention discloses a high-toughness bainite steel rail and a production method thereof. The room-temperature Charpy impact absorbing energy of a rail head of the steel rail is larger than 100 J, and the room-temperature Charpy impact absorbing energies of a rail waist and a rail bottom are both larger than 90 J. The method comprises the following steps: on-line heat treatment: when the temperature of the top surface of the steel rail after finish rolling is at a first preset temperature, respectively cooling the top surface of the steel rail, two upper fillets of a rail head and two side surfaces of the rail head at a preset cooling speed, and performing air-cooling to room temperature after the temperature of the top surface of the steel rail is at a second preset temperature; and tempering heat treatment: placing the steel rail cooled to the room temperature in a stable temperature environment, performing tempering heat treatment, and cooling the steel rail to the room temperature after the tempering heat treatment. The obtained high-toughness bainite steel rail has excellent rail web and rail bottom room-temperature impact toughness, and the bainite steel rail with high toughness in the whole section can be obtained by controlling the chemical components of the steel rail, an online heat treatment process and a tempering heat treatment process under the condition that various microalloy elements do not need to be added massively.
本发明公开了一种高韧性贝氏体钢轨及其生产方法，钢轨轨头的室温夏比冲击吸收功＞100J，轨腰、轨底的室温夏比冲击吸收功均＞90J。包括在线热处理：待终轧后钢轨轨顶面温度在第一预定温度时，以预定的冷却速度分别对钢轨轨顶面、轨头两上圆角、轨头两侧面进行冷却处理，至轨顶面温度为第二预定温度后空冷至室温；回火热处理：将冷却至室温后的钢轨放置于稳定温度环境下进行回火热处理，回火热处理后将钢轨冷却至室温。本发明得到的高韧性贝氏体钢轨，具有优秀的轨腰、轨底室温冲击韧性，通过控制钢轨化学成分、在线热处理工艺和回火热处理工艺的方法，在无需大量添加多种微合金元素的情况下即可获得全断面均具有高韧性的贝氏体钢轨。
High-toughness bainite steel rail and production method thereof
一种高韧性贝氏体钢轨及其生产方法
LI RUOXI (author) / HAN ZHENYU (author) / YUAN JUN (author) / YANG DAWEI (author)
2022-02-01
Patent
Electronic Resource
Chinese
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