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In this paper, the causes of defect of longitudinal crack on surface of Q420NQR1 continuous casting billet and rolled products with hypo-peritectic steel are analyzed as well as the control measures are put forward. The results indicated that the defect of longitudinal cracks for rolled products originated from longitudinal cracks on surface of casting blank, most of which were on the web of beam blank away from submerged entry nozzle. The inner flow field of crystallizer is studied by physical simulation. It is found that there is single circulation flow on the web of crystallizer, which directly causes the melt cinder layer of casting powder away from submerged entry nozzle to be thinner so that effective heat control is difficult to be realized at this position. The flow velocity of surface layer of liquid steel could be reduced and even distribution of melt cinder could be promoted through appropriately increasing the insertion depth of submerged entry nozzle; the quality of casting blank and rolled products could be improved combining with the uneven burden distribution mode of casting powder so that the longitudinal crack rates of casting blank and rolled products are reduced by 30% and 34% respectively.
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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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