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Outline
In order to investigate the seismic and fire resistance performance of hot-rolled SQ460FRW steel, the steel was kept at a temperature range from 250 ℃ to 650 ℃ for 1 hour to simulate fire environment, and the microstructure evolution and seismic and fire resistance performance of SQ460FRW steel after different heat treatment were analyzed. The results show that granular bainite (GB) and ferrite (F) can be observed in SQ460FRW steel before and after high-temperature heat treatment, but the degree of decomposition of martensite/austenite (M/A) islands in microstructure is different. After heat treatment at 250-650 ℃, internal friction curve of SQ460FRW steel shows that the SKK peak gradually decreases from 3.926 × 10-4 to 1.348 × 10-4, and the carbide precipitation gradually increases from 8.78% to 65.96%. Compared to hot-rolled SQ460FRW steel, SQ460FRW steel has little change in its strength and plasticity after heat treatment at low-temperature (250 ℃) and medium temperature (350 ℃), but has remarkably higher yield strength and increased yield ratio after heat treatment at or above 450 ℃. It is shown that SQ460FRW has its yield ratio less than 0.85 after treatment at or below 550 ℃. After treatment at 250-550 ℃ for 1 h, SQ460FRW steel can have its tensile properties up to the requirements for earthquake and fire resistant steel in GB/T 19879—2023 and GB/T 28415—2023 standards, and it can have higher strength after treatment at 550 ℃. It is concluded that after SQ460FRW steel for construction is heat-treated at 250-650 ℃, its yield ratio exhibits a negative linear correlation with room-temperature internal friction.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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