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In the paper, it is elaborated the key trial production plan of 550 MPa grade low alloy high strength steel including the chemical composition, hot rolling, cold rolling and annealing processes in detail as well as studied the effects of alloy elements and production processes on microstructure and properties of products. The trial production results showed that the microstructure of 550 MPa grade low alloy high strength steel was mainly composed of ferrite and dispersed precipitated phase of TiC, its main strengthening mechanisms were fine-grain strengthening and precipitation strengthening as well as its yield strength was 556~581 MPa, tensile strength was 622~653 MPa and elongation was 14.0%~16.5%, which could meet the requirements of relevant standards and product applications.
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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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