Full
Outline
In the paper, the chemical compositions of BT110V steel for high-strength and high-ductility casing are designed based on the problem that special casing for deep well of oil and gas exploitation is with high strength and low ductility by giving full play to the effects of alloying elements in steel. Moreover, the production process of BT110V high-strength and high-ductility casing is formulated with the existing production equipment of seamless steel pipe. The mechanical properties, hardenability and microstructure of trial-produced BT110V high-strength and high-ductility casing could all meet the technical requirements. For the BT110V high-strength and high-ductility casing with the specification of Φ193.68 mm×10.92 mm, failure strength caused by internal pressure is 58.6% higher than that of the technical requirement, failure strength caused by external pressure is 38.3% higher than that of the technical requirement and joint strength is 26.6% higher than that of the technical requirement. During the process of industrialized promotion and application, all indexes show good stability and the modifying effect of rare earth microalloying on inclusions is obvious.
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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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