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The axle housing is one of the main components of traveling system for vehicle. The 650QK steel developed in laborotary is with the component design of medium carbon as well as trace amount of Nb, Ti and V alloy elements are added, the microstructure is fine and even ferrite, pearlite and bainite, grain size is grade 12~13, yield strength is 664~671 MPa, tensile strength is 762~794 MPa, elongation is 20.0%~21.5%, cold bending property and low temperature impact toughness are good, low temperature impact toughness at -60 ℃ reaches 127 J, ductile-brittle transition temperature is lower than -60 ℃, ultimate fatigue strength is 270 MPa as well as synthesized mechanical properties of material are good, which could provide the technical index of basic performances of material for industrial production.
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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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