A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
The invention relates to the field of metal material heat treatment, and discloses a hypereutectoid steel rail and a preparation method thereof. The preparation method comprises the steps that (1) a high-pressure water gun is adopted for spraying a steel billet, the spraying pressure ranges from 20 MPa to 30 MPa, the spraying angle ranges from 40 degrees to 50 degrees, then the steel billet is rolled into a small-section steel billet, and then the small-section steel billet is rolled into a steel rail; (2) accelerated cooling is conducted through waste heat, obtained in the step (1), of the steel rail, and the hypereutectoid steel rail is obtained; in the step (1), a mixture of heavy oil, graphite and water is sprayed to the steel billet before each rolling in the process of rolling the small-section steel billet into the steel rail. According to the hypereutectoid steel rail prepared through the method, the dimensional precision does not exceed +/-0.5 mm, the pit depth of the steel rail is smaller than or equal to 0.5 mm, the tensile strength is larger than or equal to 1400 MPa, the ductility is larger than or equal to 10%, and the hypereutectoid steel rail is suitable for a high-speed heavy-load line with the locomotive speed larger than or equal to 120 km/h and the annual volume of traffic is larger than or equal to 100 million tons.
本发明涉及金属材料热处理领域，公开了一种过共析钢轨及其制备方法。该方法包括：(1)采用高压水枪对钢坯进行喷射，喷射压力为20‑30MPa，喷射角度为40‑50°，然后将钢坯轧制成小断面钢坯，接着将小断面钢坯轧制成钢轨；(2)利用步骤(1)得到的钢轨的余热进行加速冷却，得到过共析钢轨；其中，在步骤(1)中，在小断面钢坯轧制成钢轨的过程中，每次轧制前对钢坯喷洒重油、石墨和水的混合物。该方法制备的过共析钢轨尺寸精度不超过±0.5mm，钢轨凹坑深度≤0.5mm，抗拉强度≥1400MPa，延伸率≥10％，适宜机车速度≥120km/h、年运量≥1亿吨的高速重载线路使用。
The invention relates to the field of metal material heat treatment, and discloses a hypereutectoid steel rail and a preparation method thereof. The preparation method comprises the steps that (1) a high-pressure water gun is adopted for spraying a steel billet, the spraying pressure ranges from 20 MPa to 30 MPa, the spraying angle ranges from 40 degrees to 50 degrees, then the steel billet is rolled into a small-section steel billet, and then the small-section steel billet is rolled into a steel rail; (2) accelerated cooling is conducted through waste heat, obtained in the step (1), of the steel rail, and the hypereutectoid steel rail is obtained; in the step (1), a mixture of heavy oil, graphite and water is sprayed to the steel billet before each rolling in the process of rolling the small-section steel billet into the steel rail. According to the hypereutectoid steel rail prepared through the method, the dimensional precision does not exceed +/-0.5 mm, the pit depth of the steel rail is smaller than or equal to 0.5 mm, the tensile strength is larger than or equal to 1400 MPa, the ductility is larger than or equal to 10%, and the hypereutectoid steel rail is suitable for a high-speed heavy-load line with the locomotive speed larger than or equal to 120 km/h and the annual volume of traffic is larger than or equal to 100 million tons.
本发明涉及金属材料热处理领域，公开了一种过共析钢轨及其制备方法。该方法包括：(1)采用高压水枪对钢坯进行喷射，喷射压力为20‑30MPa，喷射角度为40‑50°，然后将钢坯轧制成小断面钢坯，接着将小断面钢坯轧制成钢轨；(2)利用步骤(1)得到的钢轨的余热进行加速冷却，得到过共析钢轨；其中，在步骤(1)中，在小断面钢坯轧制成钢轨的过程中，每次轧制前对钢坯喷洒重油、石墨和水的混合物。该方法制备的过共析钢轨尺寸精度不超过±0.5mm，钢轨凹坑深度≤0.5mm，抗拉强度≥1400MPa，延伸率≥10％，适宜机车速度≥120km/h、年运量≥1亿吨的高速重载线路使用。
Hypereutectoid steel rail and preparation method thereof
一种过共析钢轨及其制备方法
2021-04-30
Patent
Electronic Resource
Chinese
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