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In this paper, it is mainly introduced the research and development of figured steel for expansion joint of highway bridge (π profile steel) in Rail and Beam Rolling Plant of Baotou Steel to meet the market demands. In order to improve the safety of expansion joint device of highway bridge, the BG355BRE rare earth steel is designed independently to improve strength and toughness of steel. The special pass system is designed aiming at the complex cross section of π profile steel and seriously uneven deformation during rolling process. In the production process, the problem of rolling bending for asymmetric cross section are effectively solved by optimizing pass design and distributing rolling reduction of every pass reasonably. All the mechanical properties of finished products could meet the requirements of technical agreement as well as dimension and surface quality could meet the operating requirements of users so that batch supply is realized.
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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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