Experimental Study on Post-fire Mechanical Properties of TMCP Q550 Steel

Song Lincuan

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Experimental Study on Post-fire Mechanical Properties of TMCP Q550 Steel

更新时间：2025-09-25

- Experimental Study on Post-fire Mechanical Properties of TMCP Q550 Steel
- Issue 2, Pages: 369-375(2021)
- 作者机构：
  
  同济大学土木工程学院,上海,200092
- 作者简介：
- 基金信息：
- DOI：
  CLC： TU511.3TU502
- Published：2021
- 稿件说明：
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宋林昕,李国强.控轧控冷型Q550高强钢高温后的力学性能试验研究∗[J].防灾减灾工程学报,2021,(2):369-375

Song Lincuan. Experimental Study on Post-fire Mechanical Properties of TMCP Q550 Steel[J]. 2021, (2): 369-375.
宋林昕,李国强.控轧控冷型Q550高强钢高温后的力学性能试验研究∗[J].防灾减灾工程学报,2021,(2):369-375 DOI：

Song Lincuan. Experimental Study on Post-fire Mechanical Properties of TMCP Q550 Steel[J]. 2021, (2): 369-375. DOI：

摘要

通过升温、降温及冷却后的常温静力拉伸试验，对控轧控冷型(TMCP)Q550 高强钢高温后的力学性能展开试验研究，得到了经历 200~900 ℃之间 9 个不同的过火温度及自然冷却与浸水冷却两种冷却方式后，钢材的表观特征、应力-应变关系与基本力学性能参数，包括弹性模量、屈服强度、抗拉强度及断后伸长率。结果表明，过火温度及冷却方式对 TMCP 型 Q550 钢材弹性模量的影响较小；过火温度超过 600 ℃时，钢材高温后的屈服强度和抗拉强度开始折减；过火温度达到 700 ℃后，钢材的应力-应变曲线皆无屈服平台，不同冷却方式的结果开始呈现差异：随过火温度升高，自然冷却后钢材的强度减小而断后伸长率增大，浸水冷却则相反，且二者差异愈加明显。将试验结果与文献结果对比，发现当过火温度超过 700 ℃时，TMCP 型 Q550 高强钢高温后的力学性能与调质型(QT)Q550 高强钢存在差异，在经历较高的过火温度后，TMCP 钢在自然冷却下的强度折减比 QT 钢严重，浸水冷却下的强度增长程度低于 QT 钢。

Abstract

By procedures of heating，cooling and static tensile test at ambient temperature，an experimental study was carried out to investigate the post-fire mechanical properties of TMCP(ThermoMechanical Controlled Process)Q550 steel. Nine experienced temperatures from 200℃ to 900℃ and two cooling methods，that is，cooling in air and cooling in water，were considered in the experiment. The apparent characteristics，stress-strain relationship and basic mechanical parameters including elastic modulus，yield strength，ultimate strength and ultimate elongation were obtained. The results show that：high-temperature treatment and cooling method have little influence on the elastic modulus of the steel；when the experienced temperature is higher than 600℃ ，the yield strength and ultimatestrength begin to decrease；when the experienced temperature reaches 700℃ or above，the stressstrain curves of the steel have no yielding platform，and the mechanical properties of different cooling methods begin to show differences：as the experienced temperature rises，the strength decreases and the elongation increases after cooling in air，while it shows inverse trend after cooling in water，and the difference of the results between the two cooling methods becomes more obvious. Comparing the test results with literature results，it is found that when the experienced temperature is higher than 700℃ ，the post-fire mechanical properties of TMCP Q550 steel are different from those of QT (Quenched and Tempered)Q550 steel. The reduction of the elastic modulus of TMCP steel is greater than that of QT steel，and the strength of TMCP steel is lower than that of QT steel when the experienced temperature is 900℃.

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