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The thinning is a trend in the development of high-end electrical steel. Although its iron loss can be further reduced， the larger cold rolling reduction and the surface effect can influence the microstructure and texture of the final product， thereby affecting the magnetic properties. The two-stage cold rolling method can optimize the texture and increase the proportion of ｛100｝ and Goss textures. The influence of processing parameters on the microstructure， texture， and magnetic properties of a 0.10 mm thick ultra-thin non-oriented electrical steel is investigated by the two-stage cold rolling method， with a focus on the role of surface effects during prolonged holding. The results show that cube and Goss textures coexist in the final sheets produced by the two-stage cold rolling method. Furthermore， when the combined reduction from the two stages falls within the range of approximately 75% to 81%， the resulting texture and magnetic properties are superior to those of samples with reduction combinations of 90%/50% and 50%/90%. Within the temperature range of 840-920 ℃， the influence of time on grain growth is greater than that of temperature， and grain growth is affected by the surface effect in all cases. During isothermal annealing at 920 ℃， the 0.1 mm thick sample exhibits a more significant surface effect compared to the 0.27 mm thick sample， meaning grain growth is significantly hindered； the average grain size after the annealing for 60 min could not exceed the sheet thickness of 100 μm. In contrast， the average grain size of the 0.27 mm thick sheet grows to 175 μm.
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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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