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Method for applying lubricant onto mandrel bar, method for controlling thickness of lubricant film on mandrel bar, and method for manufacturing seamless steel pipe
Method for applying lubricant onto mandrel bar, method for controlling thickness of lubricant film on mandrel bar, and method for manufacturing seamless steel pipe
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机译：在芯棒上施加润滑剂的方法，控制芯棒上的润滑剂膜的厚度的方法以及无缝钢管的制造方法
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摘要
In applying a non-graphite-based lubricant composed of, by mass %, 10 to 70% of an oxide-based lamellar compound and 30 to 90% of boric acid onto a mandrel bar, the lubricant film thickness is set from a predetermined master curve for the lubricant film thickness corresponding to an amount of mica. This stably produces a seamless steel pipe of high quality, while preventing seizing marks and internal flaws.
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