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Outline
The 300 MPa grade enamel steel is with low-carbon composition design, such alloy elements as Mn, Nb and Ti are added, tapping temperature of heating furnace in hot rolling is controlled at 1 200~1 230 ℃, finishing temperature≥890 ℃, coiling temperature≤580 ℃, cold rolling reduction ratio≥65% as well as continuous annealing temperature is selected to be 830 ℃. The yield strength of developed high strength enamel steel is 367 MPa, which is still over 300 MPa after enameling as well as its microstructure mainly consists of uniform equiaxed ferrite with Fe3C and dispersed TiC precipitates. The TiC could effectively pin grain boundaries to prevent grain coarsening during high temperature treatment process. TH (sensitivity of resistance to scute burst) is 6.80~7.23 min/mm2, which could meet the requirements of EN 10209—2013 standard (TH>6.7 min/mm2).
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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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