在石油化工设备压力容器制造中，对于整体冲压成形封头的质量控制关键是封头展开下料毛坯直径展开计算和冲压成形环节。
In the fabrication of pressure vessels for petrochemical equipments, the key to quality control of stamping of head is the calculation of head blank expanding size and the stamping of the head.
在石油化工设备压力容器制造中，对于整体冲压成形封头的质量控制关键是封头展开下料毛坯直径展开计算和冲压成形环节。
In the fabrication of petrochemical plant (pressure vessel), the keys to quality control of bumped head are the diameter calculation of head blanking and its forming.
分瓣封头经冷成形后其变形和材料性能有什么变化，能否符合有关规定，过去没有充分数据证明。
There were no data enough to prove if the deformation and the material properties change after cold forming of sectionalized heads and if they can meet the relevant regulations.
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