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The thermos mechanical control process (TMCP) has been difficult to apply in the field of seamless steel pipe. The control cooling equipment after rolling is developed combining with process flow of seamless steel pipe, the X52N seamless pipeline steel pipe is produced with on-line accelerated cooling after rolling through industrial practices as well as its physical and chemical properties and microstructure are studied. The practices showed that the costly alloy elements did not need to be added into the production with C-Mn steel, microstructure of material was regulated and controlled by on-line accelerated cooling after rolling so as to ensure mechanical properties of material to meet the standard requirements as well as follow-up offline heat treatment was not needed. As a result, the requirements of physical and chemical properties for long distance pipeline steel pipe X52N could be met so that low cost, short process and economic production are realized.
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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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