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In order to meet the demands of heavy haul railways as well as make full use of the functions of chromium and niobium in steel, the high carbon rail for heavy haul railway is researched and developed by adding such strengthening elements as chromium and rare earth into high carbon rail steels through smelting the test steel with laboratory furnace and performance study. The performance indexes of rail are that the tensile strength is not less than 1 330 MPa, elongation is not less than 9%, tread hardness of rail head (HBW) is not less than 390 and other properties could meet the requirements of standard BT/T 2344—2012. The results of trial production showed that the production process of the rail was trouble free and performances could meet the technical requirements, which could satisfy the needs of heavy haul railway.
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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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