Fire resistance steel maintains strength at high temperatures and its allowable temperature is higher when compared with generic steel. Thus, it is needed to analyze its fire resistance quantitatively. In this study, high temperature creep tests of fire resistance steel specimens were conducted with variables of stress ratio and temperature to analyze their mechanical properties and behavior at a fire. The creep limit temperature of the Steel New (SN) steels observed from the high temperature tests was below 538 °C. The FR (Fire Resistance) steels showed stable creep behavior until 600 °C and maintained lower level of deformation for a longer period of time when compared with what was observed from previous studies. It is deduced that the FR steels are very effective in resisting deformation at high temperatures. As stress ratio increased, strain increased almost tenfold. Since strain increased very rapidly approximately from 1%, it is required not only to compare difference in final strain but also to quantitatively analyze creep behavior when strain is 0.5–1% and build up critical deformation data.

耐火钢在高温下仍能保持强度，其允许温度比普通钢更高。因此，需要对其耐火性能进行定量分析。在本研究中，以应力比和温度为变量对耐火钢试样进行高温蠕变试验，以分析其在火灾中的力学性能和行为。高温试验观察到的新钢 (SN) 的蠕变极限温度低于 538 °C。与之前的研究观察到的结果相比，FR（耐火）钢在 600 °C 之前都表现出稳定的蠕变行为，并且在较长时间内保持较低的变形水平。由此推断，阻燃钢在抵抗高温变形方面非常有效。随着应力比增加，应变增加了近十倍。由于应变从 1% 左右迅速增加，因此不仅需要比较最终应变的差异，还需要定量分析应变为 0.5-1% 时的蠕变行为并建立临界变形数据。