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In the paper, the alloying component system of BTP600 armor plate is designed as well as the laboratory researches on steelmaking, hot rolling and heat treatment are carried out with pilot platform. The results showed that the component system with C content of 0.42% as well as such elements as Cr, Ni, Mo and B could ensure the hardenability of BTP600 steel plate and match of impact toughness and hardness. The microstructure of as-hot-rolled steel plate is lath martensite. After tempering at 180 ℃ and 220 ℃, its boundary becomes blurry and the lath degenerates so that its length becomes shorter. With the increase of tempering temperature, the lath of tempered martensite is widened. Finally, the heat treatment process of 870 ℃ quenching+180 ℃ tempering is selected to be optimal for BTP600 armor plate, with which the impact energy at -40 ℃ could reach 15.2 J and hardness(HBW) is 624 for BTP600 steel plate.
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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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