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The independent research and development has been carried out by Baotou Steel based on the technical requirements of hot rolled coil with high strength and corrosion resistance for railway carriages. The mechanical properties and corrosion resistance of the test steel all meet technical requirements through adopting the system of low carbon+copper chromium nickel alloy and appropriate controlled rolling and controlled cooling processes. The trial production results showed that its yield strength was 550~580 MPa, tensile strength was 645~690 MPa, elongation after fracture was 20.0%~22.0%, low-temperature impact absorbing energy at -40 ℃ was 202~255 J and microstructure at room temperature was ferrite+pearlite+bainite, which was with excellent matching of strength and toughness. Its average corrosion rate is 2.813 5 mm/a, while that of Q235B is 36.060 5 mm/a, so its corrosion rate is 7.8% of that of Q235B.
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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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