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In order to improve the corrosion resistance of HRB400E steel, test steel is rolled by adding lanthanum-cerium mischmetal into it in refining process and controlling rolling-start-temperature. The inclusions and microstructure are characterized with scanning electron microscope, energy dispersive spectrometer and optical metallographic microscope as well as the effects of rare earth and rolling-start-temperature on corrosion resistance of test steel are analyzed combining with neutral salt spray test. The results showed that the Mn-Si-O inclusions were completely transformed into (Ce, La)2O3 and (Ce, La)2O2S after treatment with lanthanum-cerium mischmetal as well as part of Mn and S were nucleated around them to form complex inclusions of rare earth, but a small amount of individual MnS inclusion was still precipitated. Under the experimental conditions, the corrosion resistance of 2# test steel is optimal when rolling-start-temperature is 900 ℃, content of mischmetal is 0.011 6% and corrosion rate is 1.577 g/(m2·h).
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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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