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Outline
To address issues such as dimensional deviations，ovality，and uneven wall thickness that are prone to occur during the cold rolling forming of small‑diameter thin‑walled duplex stainless steel pipes，a finite element simulation method was employed to study the influence of Pilger cold rolling process parameters （rolling speed，rotation angle，and feed amount） on the forming dimensions of S32750 duplex stainless steel pipes.The results show that when the rolling speed is 70 cycles/min，the ovality and wall thickness unevenness of the pipe are significantly better than those at the other three speeds；among the four rotation angles，except for 60°，the other angles cause significant oval deformation in the pipe，resulting in poorer forming quality；however，at a 60° rotation angle，localized high deformation zones repeatedly appear in the sample，which may lead to uneven wall thickness；as the feed amount increases，the deviation of the pipe's forming dimensions from the target dimensions and its ovality gradually increase，and the forming quality decreases accordingly.Therefore，it is recommended that the combination of 70 cycles/min rolling speed，60° rotation angle，and 2 mm feed amount be adopted as the optimal process parameters.Through influence weight analysis，it was found that the feed amount has a greater impact on the ovality and outer diameter deviation of the pipe during cold rolling forming，while the rolling speed has a more significant influence on the wall thickness unevenness.The study provides theoretical guidance for the rolling production of small‑diameter thin‑walled duplex stainless steel pipes.
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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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