Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
The invention belongs to the technical field of fatigue-resistant steel rails, and particularly relates to a freeze-thaw cycle line fatigue-resistant steel rail and a production method thereof. The freeze-thaw cycle line fatigue-resistant steel rail is higher in toughness and higher in contact fatigue damage resistance according to the requirements of steel rails in severe geographical environments such as plateaus. The freeze-thaw cycle line fatigue-resistant steel rail comprises the following components in percentages by weight: 0.40-0.70% of C, 0.10-0.70% of Si, 0.30-1.40% of Mn, less thanor equal to 0.025% of P, less than or equal to 0.025% of S, less than or equal to 0.30% of Cr, less than or equal to 0.15% of V and the balance of Fe and inevitable impurities. The invention further provides a preparation method of the steel rail. The preparation method comprises the steps of carrying out casting, heating steel billet austenite to be homogenized, carrying out rolling treatment for10-20 passes, and then carrying out accelerated cooling and straightening treatment. According to the obtained steel rail, the tensile strength is larger than or equal to 980 MPa, the yield strengthis larger than or equal to 600 MPa, the yield ratio is larger than or equal to 0.6, the elongation percentage is larger than or equal to 15%, the strength is moderate, the elongation percentage and the toughness are high, and under the condition that a roadbed is unstable due to special geological changes such as Sichuan-Tibet railway, the steel rail has a good repeated stress effect and has goodapplication prospects.
本发明属于耐疲劳钢轨技术领域，具体涉及一种冻融循环线耐疲劳钢轨及其生产方法。针对类似高原等恶劣的地理环境钢轨的需求，本发明提供一种韧性更高、同时抗接触疲劳伤损能力更强的冻融循环线耐疲劳钢轨，成分包括：按重量百分比计，C:0.40～0.70％、Si:0.10～0.70％、Mn:0.30～1.40％、P≤0.025％、S≤0.025％、Cr≤0.30％、V≤0.15％，余量为Fe和不可避免的杂质。本发明还提供了上述钢轨的制备方法，经浇铸、加热钢坯奥氏体均匀化、10～20道次的轧制处理后，进行加速冷速和矫直处理。本发明得到的钢轨抗拉强度≥980MPa，屈服强度≥600MPa，屈强比≥0.6，延伸率≥15％，强度适中，延伸率和韧性高，在川藏铁路等特殊的地质变化带来路基不稳定的情况下，本发明钢轨具有较好的反复受力作用，具有很好的应用前景。
The invention belongs to the technical field of fatigue-resistant steel rails, and particularly relates to a freeze-thaw cycle line fatigue-resistant steel rail and a production method thereof. The freeze-thaw cycle line fatigue-resistant steel rail is higher in toughness and higher in contact fatigue damage resistance according to the requirements of steel rails in severe geographical environments such as plateaus. The freeze-thaw cycle line fatigue-resistant steel rail comprises the following components in percentages by weight: 0.40-0.70% of C, 0.10-0.70% of Si, 0.30-1.40% of Mn, less thanor equal to 0.025% of P, less than or equal to 0.025% of S, less than or equal to 0.30% of Cr, less than or equal to 0.15% of V and the balance of Fe and inevitable impurities. The invention further provides a preparation method of the steel rail. The preparation method comprises the steps of carrying out casting, heating steel billet austenite to be homogenized, carrying out rolling treatment for10-20 passes, and then carrying out accelerated cooling and straightening treatment. According to the obtained steel rail, the tensile strength is larger than or equal to 980 MPa, the yield strengthis larger than or equal to 600 MPa, the yield ratio is larger than or equal to 0.6, the elongation percentage is larger than or equal to 15%, the strength is moderate, the elongation percentage and the toughness are high, and under the condition that a roadbed is unstable due to special geological changes such as Sichuan-Tibet railway, the steel rail has a good repeated stress effect and has goodapplication prospects.
本发明属于耐疲劳钢轨技术领域，具体涉及一种冻融循环线耐疲劳钢轨及其生产方法。针对类似高原等恶劣的地理环境钢轨的需求，本发明提供一种韧性更高、同时抗接触疲劳伤损能力更强的冻融循环线耐疲劳钢轨，成分包括：按重量百分比计，C:0.40～0.70％、Si:0.10～0.70％、Mn:0.30～1.40％、P≤0.025％、S≤0.025％、Cr≤0.30％、V≤0.15％，余量为Fe和不可避免的杂质。本发明还提供了上述钢轨的制备方法，经浇铸、加热钢坯奥氏体均匀化、10～20道次的轧制处理后，进行加速冷速和矫直处理。本发明得到的钢轨抗拉强度≥980MPa，屈服强度≥600MPa，屈强比≥0.6，延伸率≥15％，强度适中，延伸率和韧性高，在川藏铁路等特殊的地质变化带来路基不稳定的情况下，本发明钢轨具有较好的反复受力作用，具有很好的应用前景。
Freeze-thaw cycle line fatigue-resistant steel rail and production method thereof
冻融循环线耐疲劳钢轨及其生产方法
08.01.2021
Patent
Elektronische Ressource
Chinesisch
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