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The characteristics of continuous cooling transformation of fire-resistant test steel are analyzed as well as its microstructure at different cooling rates within 1~100 ℃/s are observed through drawing the continuous cooling transformation(CCT) curve of 345 MPa grade fire-resistant test steel. The results showed that there were ferritic and perlitic transformations of test steel when cooling rate was 1 ℃/s; there were ferritic and bainite transformations of test steel when cooling rate was 8~20 ℃/s, pearlite completely disappeared, grain size was reduced and proportion of bainite structure was increased; microstructure transformation of test steel was mainly bainite transformation, proportion of ferritic transformation was very low and grain size was further reduced when cooling rate was 50~100 ℃/s; ferrite disappeared completely, all the microstructure was changed to bainite and was with obvious tendency of lath when cooling rate was increased to 100 ℃/s. The analysis of CCT curve and microstructure for fire-resistant test steel provides theoretical basis for formulating cooling processes in the production process of 345 MPa grade fire-resistant test steel.
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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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