Experimental Investigation on Mechanical Properties of Fire-Resistant Steel Q235FRB at Elevated Temperature
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摘要: 为了研究耐火钢在高温环境下的力学性能,采用高温稳态试验方法进行耐火钢Q235FRB标准件的拉伸试验。基于试验结果,得到了不同温度条件下耐火钢Q235FRB的应力-应变曲线,据此给出了高温下耐火钢各项力学性能参数指标(包括弹性模量、屈服强度、抗拉强度)的折减系数。研究结果表明,耐火钢Q235FRB的强度指标(包括弹性模量、屈服强度、抗拉强度)与温度基本呈负相关关系,并提出了对应计算模型。当温度达到400℃时,强度指标劣化速率加快,温度升至800℃时,强度指标基本为常温性能的10%。耐火钢Q235FRB的变形指标(极限伸长率)基本随着温度的升高呈先减小后增大的趋势。通过对比分析,耐火钢Q235FRB的力学性能和耐高温性能优于同等级普通钢,具有广泛应用前景。
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关键词:
- 耐火钢Q235FRB /
- 高温环境 /
- 试验研究 /
- 力学性能
Abstract: To investigate the mechanical properties of fire-resistant steel under elevated-temperature conditions, a steady-state method was used to conduct tensile experiments on standard specimens of fire-resistant steel Q235FRB. Based on the experimental results, stress-strain curves of fire-resistant steel Q235FRB under different temperature conditions were obtained, from which reduction factors for various mechanical performance parameters of fire-resistant steel (including elastic modulus, yield strength, and tensile strength) at elevated temperatures were obtained. The research results indicate that the strength parameters of fire-resistant steel Q235FRB (including elastic modulus, yield strength, and tensile strength) exhibit a negative correlation with temperature, and corresponding calculation models are proposed. When the temperature reaches 400 ℃, the degradation rate of strength parameters accelerates, with strength parameters reaching approximately 10% of room-temperature performance when the temperature rises to 800 ℃. The deformation parameter (ultimate elongation) of fire-resistant steel Q235FRB decreases first and then increases with the increase of temperature. Through comparative analysis, it is demonstrated that the mechanical and high-temperature resistance properties of fire-resistant steel Q235FRB surpass those of equivalent-grade ordinary steel, show casing promising application prospects. -
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