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In this paper, it is studied the microstructure and properties of medium carbon alloy steel by setting different finish cooling temperatures with two-stage cooling of 2 250 mm hot rolling production line of Baotou Steel. The results showed that as the finish cooling temperature was decreased from 500 ℃ to 100 ℃, the metallographic structure of the test steel was gradually evolved from the structure of "ferrite + pearlite" to the structure of "ferrite + martensite", the yield strength and tensile strength were increased rapidly as well as the elongation was gradually decreased. When the finish cooling temperature reached 320 ℃, the test steel began martensite transformation. According to the market demand, when the finish cooling temperature is set to 320 ℃, the performances of test steel were qualified with customer's 45° cold bend test on the basis of ensuring mechanical properties.
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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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