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The industrial trial production of S420MLO hot-rolled high-strength low temperature resistant H beam for ocean engineering is carried out by Baotou Steel based on the industrial tests. The results showed that the yield strength of test steel was greater than 450 MPa and with certain surplus, its tensile strength was 615~628 MPa, average yield ratio was 0.75, elongation could reach over 26% as well as impact energy at -40 ℃ could meet standard requirement so that it is with excellent strength and toughness. The microstructure of test steel is mainly composed of ferrite and pearlite, the nano precipitated phase in matrix is with length of 100 nm and width of 20~30 nm, which could significantly improve the properties of steel. The S420MLO hot-rolled high-strength low temperature resistant H beam developed is with excellent comprehensive properties, which could provide the solid material support for safe service of such equipment as ocean platforms.
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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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