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In the article, it is introduced the rail is deformed violently in rolling process and internal compactness is changed greatly due to the cross section size of ingot blank increases when rolling 60 kg/m rail using ingot blank with the cross section of 320 mm×415 mm instead of that with the cross section of 280 mm×380 mm in the production of rail. In order to ensure the product quality in rolling process, the roller of each rolling mill is adjusted to ensure stable as rolled state. After rolling the finished products, the macrostructure, microstructure, grain size and impact performance of rail are tested and analyzed with such equipment as the optical microscope, scanning electron microscope and impact testing apparatus. The results showed that the compression ratio of ingot blank was increased by rolling rail with large size ingot blank so that such mechanical properties as grain size and impact of rail could be improved.
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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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