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In this paper, the oxidation and decarbonization as well as formation rule of heterogeneous particles around cracks of web for SS400B hot rolled H beam are studied. The experiment is designed based on the actual working conditions on site as well as oxidation and decarbonization and performance distribution of heterogeneous particles with different processes are analyzed qualitatively and quantitatively with metallographic analysis and energy spectrum. The results showed that there was decarburization around cracks of SS400B hot rolled H beam in the stage of rough rolling, but no heterogeneous particles appeared. It is systematically and comprehensively explained that the oxidation and decarbonization and precipitation of silicon containing heterogeneous particles around cracks are closely related to the composition of steel, process location and thermal regulation combining with domestic study results.
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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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