Invention Grant
- Patent Title: Method for applying lubricant onto mandrel bar, method for controlling thickness of lubricant film on mandrel bar, and method for manufacturing seamless steel pipe
- Patent Title (中): 将润滑剂涂布在芯棒上的方法，芯棒上润滑膜厚度的控制方法以及无缝钢管的制造方法
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Application No.: US12482288Application Date: 2009-06-10
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Publication No.: US07861565B2Publication Date: 2011-01-04
- Inventor: Kenichi Saito , Sumio Iida
- Applicant: Kenichi Saito , Sumio Iida
- Applicant Address: JP Osaka-shi
- Assignee: Sumitomo Metal Industries, Ltd.
- Current Assignee: Sumitomo Metal Industries, Ltd.
- Current Assignee Address: JP Osaka-shi
- Agency: Marshall, Gerstein & Borun LLP
- Priority: JP2006-354658 20061228
- Main IPC: B21B45/02
- IPC: B21B45/02
Abstract:
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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