JP2019076925A - Square steel tube - Google Patents

Square steel tube Download PDF

Info

Publication number
JP2019076925A
JP2019076925A JP2017205161A JP2017205161A JP2019076925A JP 2019076925 A JP2019076925 A JP 2019076925A JP 2017205161 A JP2017205161 A JP 2017205161A JP 2017205161 A JP2017205161 A JP 2017205161A JP 2019076925 A JP2019076925 A JP 2019076925A
Authority
JP
Japan
Prior art keywords
steel pipe
square steel
ratio
less
material metal
Prior art date
Legal status (The legal status 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 status listed.)
Pending
Application number
JP2017205161A
Other languages
Japanese (ja)
Inventor
保雅 牧原
Yasumasa Makihara
保雅 牧原
諒太 田中
Ryota Tanaka
諒太 田中
茂信 井川
Shigenobu Igawa
茂信 井川
正二 井上
Shoji Inoue
正二 井上
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nippon Steel Nisshin Co Ltd
Nippon Steel Nisshin Pipe Co Ltd
Original Assignee
Nisshin Steel Co Ltd
Nisshin Kokan Co 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 Nisshin Steel Co Ltd, Nisshin Kokan Co Ltd filed Critical Nisshin Steel Co Ltd
Priority to JP2017205161A priority Critical patent/JP2019076925A/en
Publication of JP2019076925A publication Critical patent/JP2019076925A/en
Pending legal-status Critical Current

Links

Images

Abstract

To provide a square steel tube that can maintain suppleness of a material metal.SOLUTION: A square steel tube 1 has a rectangular cross-section with a long side 1L and a short side 1S, where a ratio (L/L) of a length Lof the long side 1L to a length Lof the short side 1S is 2.0 or more and 4.0 or less and a ratio (T/F) of a plate thickness T to a peripheral length F is 0.003 or more and 0.016 or less, thereby having the stretch equal to the stretch of a material metal.SELECTED DRAWING: Figure 2

Description

本発明は、断面矩形の角形鋼管に関するものである。   The present invention relates to a square steel pipe having a rectangular cross section.

近年、断面矩形の角形鋼管が様々な用途で使用されている。様々な角形鋼管の中でも、短辺の長さに対する長辺の長さの割合が大きく、周長に対する板厚の割合が小さく、高平坦度（長辺の凹凸量が−０．１６〜０．００ｍｍ）及び小Ｓ値（板厚±０．５ｍｍ）を有する幅広薄形の薄肉管については、例えば下記の特許文献１等に示されているように、ダイスとプラグとを使用した引抜成形により製造されている。Ｓ値は、角形鋼管の角部の寸法である（図１参照）。   In recent years, square steel pipes having a rectangular cross section are used in various applications. Among various rectangular steel pipes, the ratio of the long side to the short side is large, the ratio of the plate thickness to the circumferential length is small, and the high flatness (the unevenness of the long side is −0.16 to 0. For a wide thin thin-walled tube with 00 mm) and a small S value (plate thickness ± 0.5 mm), for example, as shown in the following Patent Document 1 etc., by pultrusion using a die and a plug It is manufactured. The S value is the dimension of the corner of a square steel pipe (see FIG. 1).

特開昭６３−１５７７１９号公報Japanese Patent Application Laid-Open No. 63-157719

上記のような従来の角形鋼管は、引抜成形により製造されているので、加工硬化のため素材金属よりも伸びが低下し、素材金属が有していたしなやかさが失われてしまう。   Since the conventional square steel tube as described above is manufactured by pultrusion, its elongation is lower than that of the base metal due to work hardening, and the base metal loses its flexibility.

本発明は、上記のような課題を解決するためになされたものであり、その目的は、素材金属のしなやかさを保つことができる角形鋼管を提供することである。   The present invention has been made to solve the above problems, and an object thereof is to provide a square steel pipe capable of maintaining the flexibility of the material metal.

本発明に係る角形鋼管は、長辺及び短辺を有する断面矩形の角形鋼管であって、短辺の長さに対する長辺の長さの割合が２．０以上かつ４．０以下であり、周長に対する板厚の割合が０．００３以上かつ０．０１６以下であり、素材金属の伸びと等しい伸びを有する。   The rectangular steel pipe according to the present invention is a rectangular steel pipe having a rectangular cross section having a long side and a short side, and the ratio of the long side to the short side is 2.0 or more and 4.0 or less, The ratio of the plate thickness to the circumferential length is 0.003 or more and 0.016 or less, and has an elongation equal to that of the material metal.

本発明の角形鋼管によれば、素材金属の伸びと等しい伸びを有するので、素材金属のしなやかさを保つことができる。   According to the square steel pipe of the present invention, since the elongation is equal to that of the material metal, the flexibility of the material metal can be maintained.

角形鋼管の角部の寸法であるＳ値を定義するための図である。It is a figure for defining S value which is a size of a corner of square steel pipe. 本発明の実施の形態による角形鋼管の断面図である。It is sectional drawing of the square steel pipe by embodiment of this invention.

以下、本発明を実施するための形態について、図面を参照して説明する。
実施の形態
図２は、本発明の実施の形態による角形鋼管１の断面図である。図２に示すように、角形鋼管１は、長辺１Ｌ及び短辺１Ｓを有する断面矩形のものである。この角形鋼管１は、短辺１Ｓの長さＬＳに対する長辺１Ｌの長さＬＬの割合（ＬＬ／ＬＳ）が２．０以上かつ４．０以下の幅広薄形であるとともに、周長Ｆに対する板厚Ｔの割合（Ｔ／Ｆ）が０．００３以上かつ０．０１６以下の薄肉管とされている。 Hereinafter, embodiments of the present invention will be described with reference to the drawings.
Embodiment FIG. 2 is a cross-sectional view of a square steel pipe 1 according to an embodiment of the present invention. As shown in FIG. 2, the square steel pipe 1 is a rectangular cross section having a long side 1 </ b> L and a short side 1 </ b> S. The square steel pipe 1 has a wide and thin shape in which a ratio (L L / L S ) of the length L L of the long side 1 L to the length L S of the short side 1 S is 2.0 or more and 4.0 or less The thin-walled pipe has a ratio (T / F) of the thickness T to the circumferential length F of 0.003 or more and 0.016 or less.

なお、図２は、角形鋼管１の延在方向１Ｄに直交する面で角形鋼管１を切断した際の角形鋼管１の断面図であり、短辺１Ｓ及び長辺１Ｌの長さＬＳ，ＬＬはその断面において測ることができる。周長Ｆは、その断面における角形鋼管１の外周面の長さによって定義することができる。板厚Ｔは、任意の位置の断面、例えば短辺側の平板部等において測定できる。 2 is a cross-sectional view of the rectangular steel pipe 1 when the rectangular steel pipe 1 is cut in a plane orthogonal to the extending direction 1D of the rectangular steel pipe 1, and the lengths L S and L of the short side 1S and the long side 1L are shown. L can be measured at the cross section. The circumferential length F can be defined by the length of the outer peripheral surface of the square steel pipe 1 in the cross section. The plate thickness T can be measured at a cross section at any position, for example, a flat plate portion on the short side.

角形鋼管１は、ロールフォーミングにより丸形鋼管を変形させることで製造される。ロールフォーミングでは、丸形鋼管を上下から挟む上下ロール対及び丸形鋼管を左右から挟む左右ロール対をそれぞれ含む複数のロールスタンドにより、丸形鋼管が断面矩形に徐々に変形される。丸形鋼管は、両側を互いに突き合わせるように平板状の素材金属を湾曲させて断面Ｃ字状のオープンパイプを形成し、それら両側の突合部分を溶接することで製造される。丸形鋼管の製造とロールフォーミングとを連続的に実施できる。   The square steel pipe 1 is manufactured by deforming a round steel pipe by roll forming. In roll forming, a round steel pipe is gradually deformed into a rectangular cross section by a plurality of roll stands respectively including upper and lower roll pairs sandwiching the round steel pipe from above and below and left and right roll pairs sandwiching the round steel pipe from the left and right. A round steel pipe is manufactured by curving a flat plate-like material metal so as to abut each other on both sides to form an open pipe having a C-shaped cross section, and welding butt parts on both sides. The production of round steel pipes and roll forming can be carried out continuously.

上述の丸形鋼管及び角形鋼管１の製造を通して、素材金属が丸形鋼管及び角形鋼管１の長手方向に実質的に引き伸ばされない。このため、丸形鋼管及び角形鋼管１の製造を通して素材金属に加工硬化が生じることを抑えることができ、角形鋼管１は素材金属の伸びと等しい伸びを有する。   Through the manufacture of the above-described round steel pipe and square steel pipe 1, the material metal is not substantially stretched in the longitudinal direction of the round steel pipe and square steel pipe 1. For this reason, it can suppress that work hardening arises in material metal through manufacture of round shape steel pipe and square steel pipe 1, and square steel pipe 1 has the elongation equal to growth of material metal.

素材金属とは、角形鋼管１の製造に用いられたものであり、丸形鋼管を製造する前の平板状のものを指す。素材金属及び角形鋼管１の伸びは、日本工業規格Ｚ２２４１に規定された金属材料引張試験方法に準拠して測定することができる。角形鋼管１の伸びと素材金属の伸びとが等しいとは、これらの伸びが厳密に等しいことのみならず、実質的に等しいことも含む。これらの伸びが実質的に等しいとは、例えば角形鋼管１の伸びをＥ１とし、素材金属の伸びをＥ０としたとき、（Ｅ０−Ｅ１）／Ｅ０が０．１０以下であることを意味することができる。 The material metal is used to manufacture the square steel pipe 1 and refers to a flat plate before manufacturing a round steel pipe. The elongation of the base metal and the square steel pipe 1 can be measured in accordance with the metal material tensile test method defined in Japanese Industrial Standard Z2241. The fact that the elongation of the rectangular steel pipe 1 and the elongation of the material metal are equal includes not only that these elongations are strictly equal but also that they are substantially equal. When the elongation of the square steel pipe 1 is E 1 and the elongation of the material metal is E 0 , for example, the elongation is substantially equal (E 0 −E 1 ) / E 0 is 0.10 or less It can mean that.

本発明の良好な伸びを有する角形鋼管は、丸形鋼管の成形後に引抜き成形を行うことなく、かつ、ロール成形機により丸形鋼管から角形鋼管に成形する際に用いる絞り率（外周長の変化率）を調整することで得ることができる。例えば、Ｚｎ−Ａｌ−Ｍｇ系合金めっき（片面めっき付着量：９０ｇ／ｍ２）が施された材質ＳＳ４００の鋼板（板厚：１．２ｍｍ）を周長が８４ｍｍで、短辺の長さに対する長辺の長さの割合が２．０以上かつ４．０以下で、Ｓ値が１．０以上かつ１．５以下の角形鋼管を製造する場合は、絞り率を６％以下に調整すれば（Ｅ０−Ｅ１）／Ｅ０を１．０以下とすることができる。なお、絞り率の調整は、ロール成形機の上下成形ロール対および左右成形ロール対の位置を変更することで行うことができる。 The rectangular steel pipe having a favorable elongation according to the present invention is a drawing ratio (change in outer peripheral length) used when forming a round steel pipe into a rectangular steel pipe with a roll forming machine without performing drawing after forming the round steel pipe. Can be obtained by adjusting the rate. For example, a steel plate (plate thickness: 1.2 mm) of material SS400 to which Zn-Al-Mg-based alloy plating (single-side plating adhesion amount: 90 g / m 2 ) has been applied has a circumferential length of 84 mm and a short side length When manufacturing a rectangular steel pipe with a long side ratio of 2.0 or more and 4.0 or less, and an S value of 1.0 or more and 1.5 or less, adjust the reduction ratio to 6% or less (E 0 -E 1 ) / E 0 can be 1.0 or less. The adjustment of the reduction ratio can be performed by changing the positions of the upper and lower forming roll pair and the left and right forming roll pair of the roll forming machine.

このような角形鋼管では、素材金属の伸びと等しい伸びを有するので、素材金属のしなやかさを保つことができる。   In such a square steel pipe, since it has an elongation equal to the elongation of the material metal, the flexibility of the material metal can be maintained.

１ 角形鋼管
１Ｓ 短辺
１Ｌ 長辺
１Ｄ 延在方向 1 Square steel pipe 1S short side 1L long side 1D extension direction

Claims (1)

長辺及び短辺を有する断面矩形の角形鋼管であって、
前記短辺の長さに対する前記長辺の長さの割合が２．０以上かつ４．０以下であり、周長に対する板厚の割合が０．００３以上かつ０．０１６以下であり、素材金属の伸びと等しい伸びを有する、
角形鋼管。 A square steel pipe having a rectangular cross section having a long side and a short side,
The ratio of the length of the long side to the length of the short side is 2.0 or more and 4.0 or less, the ratio of the plate thickness to the circumferential length is 0.003 or more and 0.016 or less, and the material metal Have an elongation equal to
Square steel pipe.
JP2017205161A 2017-10-24 2017-10-24 Square steel tube Pending JP2019076925A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2017205161A JP2019076925A (en) 2017-10-24 2017-10-24 Square steel tube

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2017205161A JP2019076925A (en) 2017-10-24 2017-10-24 Square steel tube

Publications (1)

Publication Number Publication Date
JP2019076925A true JP2019076925A (en) 2019-05-23

Family

ID=66628560

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2017205161A Pending JP2019076925A (en) 2017-10-24 2017-10-24 Square steel tube

Country Status (1)

Country Link
JP (1) JP2019076925A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110778803A (en) * 2019-10-30 2020-02-11 西安圣泰金属材料有限公司 Thin-wall high-precision titanium alloy seamless square and rectangular pipe and manufacturing method and application thereof

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH11169946A (en) * 1997-12-11 1999-06-29 Kawasaki Steel Corp Production of steel tube
JP2006150377A (en) * 2004-11-26 2006-06-15 Nakata Mfg Co Ltd Square tube forming roll, square tube rolling method and device therefor
WO2014142205A1 (en) * 2013-03-15 2014-09-18 日鐵住金建材株式会社 Roll-formed rectangular steel tube
JP2016194196A (en) * 2015-03-31 2016-11-17 日鐵住金建材株式会社 Roll molding square steel pipe

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH11169946A (en) * 1997-12-11 1999-06-29 Kawasaki Steel Corp Production of steel tube
JP2006150377A (en) * 2004-11-26 2006-06-15 Nakata Mfg Co Ltd Square tube forming roll, square tube rolling method and device therefor
WO2014142205A1 (en) * 2013-03-15 2014-09-18 日鐵住金建材株式会社 Roll-formed rectangular steel tube
JP2016194196A (en) * 2015-03-31 2016-11-17 日鐵住金建材株式会社 Roll molding square steel pipe

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110778803A (en) * 2019-10-30 2020-02-11 西安圣泰金属材料有限公司 Thin-wall high-precision titanium alloy seamless square and rectangular pipe and manufacturing method and application thereof

Similar Documents

Publication Publication Date Title
JP2017087294A (en) Component of surface treated steel plate having cut end face, and cutting method thereof
TWI711498B (en) Formed material manufacturing method and formed material
CN108463295A (en) Method for manufacturing high-voltage tube
JP2019076925A (en) Square steel tube
US20190032819A1 (en) Pipe body, pipe and method of making pipe
US8584498B2 (en) Mandrel mill and method for manufacturing seamless pipe or tube
JP2011005534A (en) Method for manufacturing deformed cross-sectional bar
JP2013087309A (en) Copper alloy sheet with deformed cross section having low anisotropy of bending work and method for manufacturing the same
CN205701931U (en) A kind of beam straightening roller
JPWO2008123121A1 (en) Seamless pipe manufacturing method and perforated roll
CN108060376A (en) A kind of abros NS3304 seamless pipes high-yield-ratio, Hi-grade steel control method
JP2010172936A (en) Blooming mill method using continuous rolling mill
KR20170132808A (en) Aluminum alloy tube excellent in corrosion resistance and workability and manufacturing method thereof
JP2009208100A (en) Manufacturing method for cold-rolled steel sheet
KR200370488Y1 (en) multi-layer pipe, bending equipment and manufacturing equiement for the same
US11731184B2 (en) Rolling straightening machine and method of manufacturing a pipe or tube or a bar using same
JP6780489B2 (en) Manufacturing method of electric pipe and electric pipe
JP6066291B2 (en) Manufacturing method of small diameter metal pipe
JP2010131602A (en) Method of manufacturing seamless pipe
JP5000307B2 (en) Rolling load prediction method for sheet metal rolling
JP4231449B2 (en) Method and apparatus for drawing and rolling metal tubes
JP2013063463A (en) Method and apparatus for manufacturing small-diameter metal pipe
CN2754758Y (en) Puncturing expanding head
JPH10258312A (en) Manufacture of welded tube excellent in roundness
JP2015147226A (en) Production method of thick electric resistance welded tube

Legal Events

Date Code Title Description
RD02 Notification of acceptance of power of attorney

Free format text: JAPANESE INTERMEDIATE CODE: A7422

Effective date: 20171201

RD04 Notification of resignation of power of attorney

Free format text: JAPANESE INTERMEDIATE CODE: A7424

Effective date: 20171206

A521 Request for written amendment filed

Free format text: JAPANESE INTERMEDIATE CODE: A523

Effective date: 20171211

A711 Notification of change in applicant

Free format text: JAPANESE INTERMEDIATE CODE: A712

Effective date: 20200901

A621 Written request for application examination

Free format text: JAPANESE INTERMEDIATE CODE: A621

Effective date: 20200918

A977 Report on retrieval

Free format text: JAPANESE INTERMEDIATE CODE: A971007

Effective date: 20210604

A131 Notification of reasons for refusal

Free format text: JAPANESE INTERMEDIATE CODE: A131

Effective date: 20210615

A521 Request for written amendment filed

Free format text: JAPANESE INTERMEDIATE CODE: A523

Effective date: 20210816

A131 Notification of reasons for refusal

Free format text: JAPANESE INTERMEDIATE CODE: A131

Effective date: 20210914

A02 Decision of refusal

Free format text: JAPANESE INTERMEDIATE CODE: A02

Effective date: 20220308