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In this article, the low temperature performances of 60 kg/m as-hot-rolled U71Mn and U75V rails as well as U71MnH and U75VH rails after on-line heat treatment produced by Baotou Steel are studied. The relation between the toughness and temperature of different rails in low temperature environment is studied through impact test and test for fracture toughness of rails in the low temperature environment created in the laboratory. It is elaborated the performance indexes of safe service for rails of Baotou Steel in low temperature environment and summarized the relations of toughness indexes for four types of rail products of Baotou Steel in low temperature environment, which provide the data support for selecting rails in plateau and low temperature regions as well as safe operations of railway system in extremely cold environment.
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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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