US3701272A - Method of manufacturing seamless steel pipes - Google Patents

Method of manufacturing seamless steel pipes Download PDF

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Publication number
US3701272A
US3701272A US82258A US3701272DA US3701272A US 3701272 A US3701272 A US 3701272A US 82258 A US82258 A US 82258A US 3701272D A US3701272D A US 3701272DA US 3701272 A US3701272 A US 3701272A
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US
United States
Prior art keywords
piercing
blank
rolls
plug
rolling mill
Prior art date
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Expired - Lifetime
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US82258A
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English (en)
Inventor
Hiroshi Nagai
Haruo Kamimura
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JFE Engineering Corp
Original Assignee
Nippon Kokan Ltd
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Filing date
Publication date
Application filed by Nippon Kokan Ltd filed Critical Nippon Kokan Ltd
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Publication of US3701272A publication Critical patent/US3701272A/en
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    • 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
    • B21B17/08—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 having one or more protrusions, i.e. only the mandrel plugs contact the rolled tube; Press-piercing mills
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B19/00—Tube-rolling by rollers arranged outside the work and having their axes not perpendicular to the axis of the work
    • B21B19/02—Tube-rolling by rollers arranged outside the work and having their axes not perpendicular to the axis of the work the axes of the rollers being arranged essentially diagonally to the axis of the work, e.g. "cross" tube-rolling ; Diescher mills, Stiefel disc piercers or Stiefel rotary piercers
    • B21B19/04—Rolling basic material of solid, i.e. non-hollow, structure; Piercing, e.g. rotary piercing mills

Definitions

  • ABSTRACT In a method of manufacturing a seamless steel pipe by piercing a blank by means of a piercing machine and then rolling the pierced blank into the product by means of a rolling mill, the blank is pierced at a reduction rate of 75 to 85 percent by using a piercing machine comprising rolls having flat gorges at the center thereof and a piercing plug provided with an annular recess on its outer periphery at portions corresponding to the gorges and then the pierced blank is rolled by a single pass and at a reduction rate of 15 to 25 percent by means of a rolling mill having rolls and a plug, the curvature of the relieve of the caliber of the rolls of the rolling mill is reduced to minimize the tendency of forming fins on the surface of the product.
  • This invention relates to a method of manufacturing seamless steel pipes by means of Mannessman plug mill wherein the reduction rate of the piercing machine is increased to produce a thin walled pierced blank by improving the configuration of the gorge of the rolls of the piercing machine and by improving the construction of the piercing plug.
  • the pierced blank is thin rolled by means of a rolling mill at a reduced reduction rate to minimize the tendency of forming fins on the outer surface of the product, thus finishing the rolling operation by a single pass.
  • the efficiency of manufacturing seamless steel pipes by using a Mannessman plug mill is determined mainly by the cycle time of a line including a piercing machine, a rolling mill and a pipe polishing machine.
  • the rolling mill used in the prior art installation for manufacturing steel pipes generally requires two, three or more passes, thus decreasing the efficiency of rolling.
  • Another object of this invention is to provide a product having a smooth surface finish free from fins or surface irregularities.
  • these and other objects can be attained by improving the construction of the piercing rolls and the piercing plug of the piercing machine and by reducing the curvature of the relieve of the caliber of the rolls of the rolling mill.
  • the blank in a method of manufacturing a seamless steel pipe by piercing a blank by means of a piercing machine and then rolling the pierced blank into the product by means of a rolling mill, the blank is pierced at a reduction rate of 75 to 85 percent by using a piercing machine comprising rolls having flat gorges at the center thereof and a piercing plug provided with an annular recess on its outer periphery at portions corresponding to the gorges and then the pierced blank is rolled by a single pass and at a reduction rate of to percent by means of a rolling mill having rolls and a plug.
  • the radius of the relieve of the caliber of the rolls of the rolling mill is reduced to minimize the tendency of forming fins oh the surface of the product.
  • FIG. 1 is a side view, partly in section, of a pair of rolls and a blank, to explain the operation of a piercing machine
  • FIG. 2 shows a cross-section taken along a line II II in FIG. 1;
  • FIG. 3 is an enlarged view to show the relationship between the piercing rolls and the piercing plug
  • FIG. 4 is a side view, partly in section, to explain a rolling operation
  • FIG. 5 is a partial side view of a mill caliber
  • FIGS. 6 and 7 are plots of reduction rates varying in the harmonic progression along the entire contact length of the piercing plug, wherein FIG. 6 shows the prior art whereas FIG. 7 this invention.
  • FIG. 8 shows the detail of the piercing plug shown in FIG. 3 wherein the dotted lines show the contour of the piercing plug utilized in the prior method whereas solid lines show the contour of the piercing plug utilized in this invention.
  • a typical piercing machine comprises piercing rolls 1, a piercing plug 2 and guide shoes 3 for guiding a steel blank 4.
  • the gorges 5 at the center of piercing rolls 1 are pointed to force the blank to the rear side against the force applied by the plug, whereas according to this invention, gorges are not pointed but are made flat and the portions of the piercing plug confronting against the gorges are depressed around the entire periphery to form an annular recess 6 as best shown in FIG. 3.
  • This annular recess is shaped as shown in FIG.
  • the blank 4 is smoothly pierced by the cooperation of the piercing rolls 1 and the piercing plug 2, thus reducing scratches on the inner and outer surfaces of the products.
  • the blank Near the rear end of the piercing plug 2, the blank is subjected to ironing action by the piercing rolls 1 and the piercing plug 1 thus preventing stepped configuration from being formed on the inner and outer surfaces of the pierced blank.
  • the reduction rate is increased to 75 to 85 percent over the prior art reduction rate of about 70 percent.
  • the blank 9 is reduced while it is subjected to a heavy reduction as shown in F IG. 4.
  • the end of the plug 8 is shaped as a frustum of a cone.
  • the radius R of the relieve I 1 of the rolling caliber is made smaller than that R of the prior construction to prevent the tendency of forming fins on the rolled product.
  • This construction improves grippingthus enabling heavy reduction of a blank of thick wall.
  • the reduction rate is about 40 percent, whereas in this invention it is reduced to 15 to 25 percent.
  • the invention can be applied to all types of steels and various dimensions of the seamless pipes that can be rolled by the Mannessman plug mill.
  • EXAMPLE 1 Blanks of a dimension of 104.5 Kg/m were formed into seamless pipes according to this invention and to the prior method, the dimension of the products being 15.00 Kg/m for both cases.
  • EXAMPLE 2 Following table 2 compares the reduction rate by the piercing plug and the reduction rate by the rolling mill of the products of 19.0 Kg/m manufactured from steel 1.
  • the improvement which comprises the steps of piercing said blank at a reduction rate of to percent by using a piercing machine comprising rolls having flat gorges at the center thereof and a piercing plug provided with an annular recess on its outer periphery at portions corresponding to said gorges, and rolling the pierced blank by a single pass and at a reduction rate of 15 to 25 percent by means of a rolling mill having rolls and a plug, the radius of the relieve of the caliber of the rolls of said rolling mill being reduced to minimize the tendency of forming fins on the surface of the product.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Reduction Rolling/Reduction Stand/Operation Of Reduction Machine (AREA)
  • Heat Treatment Of Steel (AREA)
US82258A 1970-10-17 1970-10-20 Method of manufacturing seamless steel pipes Expired - Lifetime US3701272A (en)

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
GB49428/70A GB1291744A (en) 1970-10-17 1970-10-17 Method of manufacturing seamless steel pipes
DE19702051260 DE2051260A1 (de) 1970-10-17 1970-10-19 Verfahren zur Herstellung nahtloser Stahlrohre
FR7037621A FR2120229A5 (OSRAM) 1970-10-17 1970-10-19
AU21228/70A AU440258B2 (en) 1970-10-17 1970-10-19 Method of manufacturing seamless steel pipes
US8225870A 1970-10-20 1970-10-20

Publications (1)

Publication Number Publication Date
US3701272A true US3701272A (en) 1972-10-31

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ID=27506668

Family Applications (1)

Application Number Title Priority Date Filing Date
US82258A Expired - Lifetime US3701272A (en) 1970-10-17 1970-10-20 Method of manufacturing seamless steel pipes

Country Status (5)

Country Link
US (1) US3701272A (OSRAM)
AU (1) AU440258B2 (OSRAM)
DE (1) DE2051260A1 (OSRAM)
FR (1) FR2120229A5 (OSRAM)
GB (1) GB1291744A (OSRAM)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104245167A (zh) * 2012-04-11 2014-12-24 新日铁住金株式会社 用于穿孔机的顶头和顶头的再生方法
CN109926451A (zh) * 2019-04-15 2019-06-25 湖南科技大学 一种无缝钢管定径热轧工艺的减径率分配方法

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3710193C1 (de) * 1987-03-27 1988-05-19 Mannesmann Ag Verfahren zum Herstellen nahtloser Rohre ueber 200 mm Durchmesser und Vorrichtung zur Durchfuehrung des Verfahrens
RU2362639C1 (ru) * 2007-12-06 2009-07-27 Открытое акционерное общество "Синарский трубный завод" (ОАО "СинТЗ") Способ продольной прокатки труб

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US792231A (en) * 1904-04-01 1905-06-13 Nat Tube Co Art of cross-rolling tubular bodies or blanks in a heated state.
US2176155A (en) * 1936-09-03 1939-10-17 Timken Roller Bearing Co Apparatus for elongating and decreasing the wall thickness of tubular blanks
US2264455A (en) * 1939-08-07 1941-12-02 Nat Tube Co Method of producing a thick-walled seamless metallic tube
US2274579A (en) * 1941-05-05 1942-02-24 Nat Tube Co Method of producing seamless tubes

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US792231A (en) * 1904-04-01 1905-06-13 Nat Tube Co Art of cross-rolling tubular bodies or blanks in a heated state.
US2176155A (en) * 1936-09-03 1939-10-17 Timken Roller Bearing Co Apparatus for elongating and decreasing the wall thickness of tubular blanks
US2264455A (en) * 1939-08-07 1941-12-02 Nat Tube Co Method of producing a thick-walled seamless metallic tube
US2274579A (en) * 1941-05-05 1942-02-24 Nat Tube Co Method of producing seamless tubes

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104245167A (zh) * 2012-04-11 2014-12-24 新日铁住金株式会社 用于穿孔机的顶头和顶头的再生方法
CN104245167B (zh) * 2012-04-11 2016-03-30 新日铁住金株式会社 用于穿孔机的顶头的再生方法
CN109926451A (zh) * 2019-04-15 2019-06-25 湖南科技大学 一种无缝钢管定径热轧工艺的减径率分配方法
CN109926451B (zh) * 2019-04-15 2020-07-21 湖南科技大学 一种无缝钢管定径热轧工艺的减径率分配方法

Also Published As

Publication number Publication date
DE2051260A1 (de) 1972-04-20
FR2120229A5 (OSRAM) 1972-08-18
GB1291744A (en) 1972-10-04
AU2122870A (en) 1972-04-20
AU440258B2 (en) 1973-09-06

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