WO2008126633A1 - Process for manufacturing seamless pipe - Google Patents

Process for manufacturing seamless pipe Download PDF

Info

Publication number
WO2008126633A1
WO2008126633A1 PCT/JP2008/054716 JP2008054716W WO2008126633A1 WO 2008126633 A1 WO2008126633 A1 WO 2008126633A1 JP 2008054716 W JP2008054716 W JP 2008054716W WO 2008126633 A1 WO2008126633 A1 WO 2008126633A1
Authority
WO
WIPO (PCT)
Prior art keywords
pipe
rolling
seamless pipe
groove
manufacturing
Prior art date
Application number
PCT/JP2008/054716
Other languages
French (fr)
Japanese (ja)
Inventor
Kenichi Saito
Original Assignee
Sumitomo Metal Industries, Ltd.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Sumitomo Metal Industries, Ltd. filed Critical Sumitomo Metal Industries, Ltd.
Publication of WO2008126633A1 publication Critical patent/WO2008126633A1/en

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B17/00—Tube-rolling by rollers of which the axes are arranged essentially perpendicular to the axis of the work, e.g. "axial" tube-rolling
    • B21B17/02—Tube-rolling by rollers of which the axes are arranged essentially perpendicular to the axis of the work, e.g. "axial" tube-rolling with mandrel, i.e. the mandrel rod contacts the rolled tube over the rod length
    • B21B17/04—Tube-rolling by rollers of which the axes are arranged essentially perpendicular to the axis of the work, e.g. "axial" tube-rolling with mandrel, i.e. the mandrel rod contacts the rolled tube over the rod length in a continuous process
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B27/00—Rolls, roll alloys or roll fabrication; Lubricating, cooling or heating rolls while in use
    • B21B27/02—Shape or construction of rolls
    • B21B27/024—Rolls for bars, rods, rounds, tubes, wire or the like

Abstract

A process for manufacturing a seamless pipe, in which cracking at pipe end portions can be effectively prevented in the stretch rolling step by means of a mandrel mill. The process for manufacturing a seamless pipe is characterized by including the steps of carrying out stretch rolling of a pipe by means of a first rolling stand allowing the groove ellipticity defined by disposed grooved roll to satisfy the requirements of the following formula (1) and carrying out stretch rolling of the pipe by means of a second rolling stand allowing the ratio of S/R1 wherein S means an offset extent and R1 means a curvature radius of groove bottom defined by disposed grooved roll to satisfy the requirements of the following formula (2). 1.2≤groove ellipticity≤1.4 (1) S/R1≤-0.35 Ln(X)+1.43 (2) wherein X of the formula (2) means the groove bottom draft (%) at the second rolling stand.
PCT/JP2008/054716 2007-03-30 2008-03-14 Process for manufacturing seamless pipe WO2008126633A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2007090626A JP2008246535A (en) 2007-03-30 2007-03-30 Method of manufacturing seamless tube
JP2007-090626 2007-03-30

Publications (1)

Publication Number Publication Date
WO2008126633A1 true WO2008126633A1 (en) 2008-10-23

Family

ID=39863759

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2008/054716 WO2008126633A1 (en) 2007-03-30 2008-03-14 Process for manufacturing seamless pipe

Country Status (2)

Country Link
JP (1) JP2008246535A (en)
WO (1) WO2008126633A1 (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ITMI20111754A1 (en) * 2011-09-29 2013-03-30 Danieli Off Mecc LAMINATION CAGE FOR CALIBRATOR OR REDUCER FOR MULTIPLE PRESSURE POINTS
CN104785525B (en) * 2015-04-07 2017-03-01 浙江嘉翔精密机械技术有限公司 A kind of method improving nuclear steam generator performance of heat exchange tubes
CN110280594B (en) * 2019-07-19 2020-06-26 北京科技大学 Flexible roll bending forming design method for circular tube

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH08276208A (en) * 1995-04-04 1996-10-22 Sumitomo Metal Ind Ltd Mandrel mill
JP2001113306A (en) * 1999-10-18 2001-04-24 Sumitomo Metal Ind Ltd Manufacturing method for high alloy seamless steel tube and rolling pass used therefor

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH08276208A (en) * 1995-04-04 1996-10-22 Sumitomo Metal Ind Ltd Mandrel mill
JP2001113306A (en) * 1999-10-18 2001-04-24 Sumitomo Metal Ind Ltd Manufacturing method for high alloy seamless steel tube and rolling pass used therefor

Also Published As

Publication number Publication date
JP2008246535A (en) 2008-10-16

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