cold upsetting
... 冷精锻 die forging 冷顶锻 coldupsetting 冷镦。冷顶锻 upset ...
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冷顶锻用钢 cold heading steel
冷顶锻用碳素钢线材 SWCH
冷顶锻的 cold headed
冷或热顶锻用钢 UF
冷球顶锻 cold ball heading
轧制过程中各道次的不均匀变形和挤压褶皱造成了圆钢表面的长条形缺陷，而表面和近表面缺陷是造成冷顶锻开裂的主要原因。
Uneven deformation and extrusion drape in the different pass when rolling cause long strip defect on the surface. Defects on the surface and near surface are the main cause for cold heading to craze.
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