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The chemical composition, heating and rolling processes of hot rolled beam SM490YB are reasonably designed according to the technical standard requirements of hot rolled H beam SM490YB for offshore oil platforms in the Japanese Standard JIS G 3106-2020 “Rolled Steel for Welded Structures” combining with the characteristics of working conditions of production line in steel plant. The yield strength of the test steel with Nb-V microalloying is 412~420 MPa, tensile strength is 531~545 MPa, elongation after fracture is 26%~29%, longitudinal impact absorbing energy at -20 ℃ is greater than 200 J and transverse impact absorbing energy is greater than 110 J; microstructure of the test steel at room temperature is fine ferrite+pearlite and grain size number of ferrite is 8.5. The test results showed that the H beam with Nb-V microalloying was with good comprehensive mechanical properties, which could meet the requirements of high strength and toughness, low temperature resistance and easy to be welded for the steel for offshore oil 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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