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In order to meet the requirements of carbon equivalent and low temperature toughness, the chemical composition of low temperature Q355C hot rolled H beam for steel structure is designed and reasonable process route is formulated according to the functions of Nb element in steel as well as the mechanical properties of test steel are analyzed based on industrial production data. The test results showed that the yield strength of test steel was 355~465 MPa, tensile strength was stabilized at 525~620 MPa, elongation after fracture was stabilized at over 22% and low temperature impact energy at 0 ℃ was stabilized at 60~160 J by adding Nb element. Finally, the low temperature Q355C hot rolled H beam for steel structure mainly with ferrite and pearlite is obtained as well as all the properties of product could meet standard requirements.
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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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