Full
Outline
The 590 MPa grade cold rolled dual-phase steel was developed in the laboratory, its chemical composition, rolling and continuous annealing processes were studied, the mechanical properties were measured and the microstructure was analyzed as well as the effects of levelling elongation on the mechanical properties of steel belt were analyzed combining with the experimental results. The results indicated that the cold rolled dual-phase steel was with good mechanical properties by heat preservation at 820 ℃, slow cooling to 680 ℃, then rapid cooling with the rate of over 30 ℃/s to 270 ℃ to be overaging with the levelling elongation of 0.8%. Its yield strength was 376 MPa, tensile strength was 652 MPa and elongation reached 21%.
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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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