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In this paper, it is briefly introduced the research and development and production processes of rare earth rails, summarized researches of rare earth rails in different periods as well as mainly introduced the technical specifications and industrial production of U76CrREH rail in TB/T 2344.1—2020 standard. U76CrREH rail is the rail with independent design, research and development and production of Baotou Steel as well as with the highest strength grade in China’s railways. The rare earth is mainly used to purify molten steel and refine microstructure in order to achieve the effect of improving fatigue life during service of rails. The industrial production requires narrow composition range as well as adopts such control technologies as low H and O to ensure internal metallurgical quality of rail; its tensile strength ≥1 280 MPa, tread hardness (HB)≥370, microstructure is pearlite and surface quality could meet the technical requirements of standard through adopting such technologies as rolling and cooling technologies of online heat treatment. The rail is applied on small radius curves in Urumqi and has been in service for over three months. The accumulated total through-put weight reaches 30 Mt as well as surface condition and wear of the rail are normal with side wear of 0~0.13 mm.
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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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