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The large-grained ribbed Al2O3 inclusion is the main cause of cracking through analyzing the cracking in process of stamping beam steel BT700L. In order to improve the size and morphology of inclusion in product, the rare earth Ce is added in production of beam steel BT700L. Since the affinity of rare earth Ce and oxygen is very strong, the rare earth Ce in molten steel reacts with oxygen and generates rare earth oxide (RE2O3) coming up to slag so that the yield of rare earth Ce in steel is extremely low. It could be improved effectively through optimizing and controlling the content of Ce in molten steel of steelmaking and continuous casting, oxidability of slag as well as such process as protective casting of continuous caster. Moreover, the atomic radius of rare earth Ce is greater than that of iron atom and rare earth Ce could denature inclusions in steel. It is found that the size of inclusion in product becomes small, morphology of inclusion spheroidizes and low temperature impacting property of product is effectively improved after add rare earth Ce into molten steel through studying and analyzing adding rare earth Ce into beam steel BT700L.
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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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