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Manufacturing method of plug used for piercing and rolling of metal material, manufacturing method of metal tube, and plug used for piercing and rolling of metal material
Manufacturing method of plug used for piercing and rolling of metal material, manufacturing method of metal tube, and plug used for piercing and rolling of metal material
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机译:用于金属材料的穿孔和轧制的塞子的制造方法,金属管的制造方法以及用于金属材料的穿孔和轧制的塞子
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摘要
A plug material having a prescribed shape is prepared, the prepared plug material is thermally treated in a heat treatment atmosphere that contains at least 1.0 vol.% oxygen at a heat treatment temperature of at least 950°C and less than 1050°C and thus a plug having an oxide scale layer 30 on the surface is manufactured. According to the manufacturing method, pores PO that extend along the surface SF of the plug material are formed under outer scale layer 20 in the oxide scale layer 30, which allows cracks to be more easily propagated in the outer scale layer 20. Therefore, the outer scale layer 20 is more easily peeled off than the conventional one.
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