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In order to meet the energy-saving and emission reduction demand of commercial vehicles, important chassis components such as axles are developing towards high load-bearing, long lifespan and lightweight. A new type of microalloyed structural steel has been developed based on the traditional LZ27Mn2 steel grade for a 13 t trailer axle. A new car axle product has been successfully developed through new material development, structural optimization, heat treatment, and surface shot peening. Compared with the original axle, the new axle has successfully reduced weight by about 13.2%. Yield strength of the new axle matrix is≥800 MPa, tensile strength is≥860 MPa, elongation is ≥ 18%, impact energy at room temperature is≥130 J, and impact energy at -20 ℃ is ≥100 J. The new axle has been tested to meet the requirements for rigidity, strength (safety factor≥6.0) and fatigue life (1.2 million times) and meets the relevant technical requirements of the product.
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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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