Ehrhardt piercing process

塑性加工
Synonyms (3)：

Ehrhardt process (Ehrhardt法)
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Ehrhardt method (Ehrhardt製管法)
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rising piercing method (上昇穿孔法)
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Related terms (2)：

seamless steel pipe (継目無し鋼管)
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extrusion (押出)
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Broader terms (2)：

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