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In this paper, the microstructure and properties of hot rolled 600 MPa grade dual phase steel plate for automobile structure are compared with those of hot rolled pickling plate. The results show that both of the yield strength and tensile strength are improved after pickling, there is no great change for elongation as well as the performances of hot rolled pickling plate could meet the requirements of standard; due to the work hardening of plate caused by withdrawal and straightening process before pickling, the impact energy values of pickling plate are lower than those of hot rolled plate with a series of thermal shock tests; after the pickling process, the microstructure is a large number of polygonal ferrite and a small amount of martensite, the grain size is changed from grade 10.5 to grade 12.0 and grain becomes finer because of cold deformation.
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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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