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In this paper, the causes of surface defects for 310 zed beam rolled by YQ450NQR1 continuous casting billet produced with cross section of bloom (320×415 mm) by 7# continuous casting machine in Steel-making Plant of Baotou Steel are analyzed and control scheme is proposed so that the yield of product is improved. The tongue-shaped defects in rolled products are determined to be caused by the surface crack at corner of continuous casting billet by analyzing the macrostructure and microstructure of continuous casting billet and rolled products with metallographic microscope and scanning electron microscope. The qualified rate of YQ450NQR1 continuous casting billet is improved from 90.5% to 98.5% and stable control of product quality for 310 zed beam is realized through reducing the water amount and optimizing uniformity of water crevice for crystallizer to improve the uniformity of continuous casting billet cooled in crystallizer as well as taking such measures as reducing the specific water amount of secondary cooling, increasing casting speed to increase the surface temperature of entering tension leveler and optimizing slow cooling regime.
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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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