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The study on composition design of Nb microalloying and process optimization for HC300LAD+Z high strength low alloy steel is carried out based on the 1 880 mm hot-dip galvanizing production line of Baotou Steel in order to meet the market requirements of 300 MPa grade high strength galvanized sheet for light weight of home appliances. The effects of soaking temperature for hot-dip galvannealing process (790~850 ℃) on mechanical properties of product are systematically studied through the thermal simulation test and industrial trial production. The results showed that the increase of soaking temperature caused grain coarsening, yield strength was decreased from 335 MPa at 790 ℃ to 297 MPa at 850 ℃ and elongation was increased from 28% at 790 ℃ to 38% at 850 ℃. The target soaking temperature of annealing for industrial production is controlled at 810±15 ℃, microstructure is equally distributed ferrite+ a small quantity of pearlite without mixed crystal, yield strength is 310~368 MPa and elongation is 28%~39% for product, which could meet the thickness reduction requirement of 20% for components of home appliances so that the solution of reliable material for light weight of steel for home appliances is provided. The influencing mechanisms of annealing temperature on recrystallization behavior of Nb microalloyed steel are revealed in this study, which could provide the practical references for optimizing production process of high strength low alloy steel with similar production lines.
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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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