In the metallic tube producing method, a maximum diameter of the plug or tapered mandrel bar may be larger than an outside diameter of the mother tube.
在上述金属管的制造方法中，顶头或锥状芯棒的加工最大直径可以大于管坯外径。
In the metallic tube producing method, a maximum diameter of the plug or tapered mandrel bar may be larger than an outside diameter of the mother tube.
在上述金属管的制造方法中，顶头或锥状芯棒的加工最大直径可以大于管坯外径。
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