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The chemical compositions of wire rod for large heat input welding are designed, its continuous cooling transformation (CCT) curves are determined, key control parameters of smelting process are established and industrial trial production is carried out with twice-heating production by analyzing the influences of chemical elements on welding performances of wire rod. The results indicated that the Ti content needed to be controlled over 0.15% in order to increase the input quantity of welding energy; the non-metallic inclusion of TiN in steel was controlled effectively in smelting process to ensure the pouring in continuous casting process is trouble-free; the optimum cooling rate was controlled at around 1 ℃/s, microstructure obtained was ferrite+pearlite+a small amount of bainite; the performance examination results of wire rod could fully meet the requirements of technical agreement and its welding performances were good, there were no welding cold cracks after drawing by user.
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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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