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In this paper, the production technology process and relative process parameters of new product, 27SiMn spring steel plate are introduced. The microstructure needed by product is obtained through reasonably setting cooling parameters after rolling, with which the mechanical properties of product are ensured. The using status of users shows that the performances of 27SiMn spring steel plate are good by making full use of existing equipment of Baotou Steel, adopting reasonable process parameters under the condition that both of raw materials and liquid iron meet the requirements. Its tensile strength is not less than 800 MPa and elongation is not less than 19%. Moreover, the effects of atmosphere in heating furnace on decarburized layer on the surface of medium carbon steel with silicon are important, decarburized layer on the surface of 27SiMn spring steel plate is just 24% of the requirements in the national standard GB/T 1222—2016 by reducing atmosphere and micro-positive pressure operations in heating furnace.
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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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