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Outline
In this paper, it is introduced the evolution law of mechanical properties and microstructure for BT140TT high anti-collapse casing with the specification of Ф141 mm × 13.5 mm produced by Steel Tube Co. of Baotou Steel with different heat treatment processes, the orthogonal experiment of heat treatment process showed that the optimum heat treatment process of BT140TT was quenching at (890 ± 10)℃ and holding for 40 min, tempering at (660 ± 10)℃ and holding for 90 min, material yield strength≥965 MPa and impact energy at 0 ℃ ≥100 J, which could meet the design requirements of BT140TT anti-collapse casing as well as the integrated requirement of high strength and toughness could be realized.
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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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