JPH035014A - Manufacture of clad shape steel by hot extrusion - Google Patents
Manufacture of clad shape steel by hot extrusionInfo
- Publication number
- JPH035014A JPH035014A JP13761289A JP13761289A JPH035014A JP H035014 A JPH035014 A JP H035014A JP 13761289 A JP13761289 A JP 13761289A JP 13761289 A JP13761289 A JP 13761289A JP H035014 A JPH035014 A JP H035014A
- Authority
- JP
- Japan
- Prior art keywords
- clad
- thickness
- shape steel
- hot extrusion
- hot
- 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
Links
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 39
- 239000010959 steel Substances 0.000 title claims abstract description 39
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 19
- 238000001192 hot extrusion Methods 0.000 title claims description 20
- 239000000463 material Substances 0.000 claims abstract description 72
- 238000010438 heat treatment Methods 0.000 claims abstract description 4
- 238000000034 method Methods 0.000 claims description 18
- 239000010953 base metal Substances 0.000 abstract description 2
- 238000005253 cladding Methods 0.000 description 33
- 229910000746 Structural steel Inorganic materials 0.000 description 4
- 238000005096 rolling process Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 238000005266 casting Methods 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 238000005482 strain hardening Methods 0.000 description 2
- OWNRRUFOJXFKCU-UHFFFAOYSA-N Bromadiolone Chemical compound C=1C=C(C=2C=CC(Br)=CC=2)C=CC=1C(O)CC(C=1C(OC2=CC=CC=C2C=1O)=O)C1=CC=CC=C1 OWNRRUFOJXFKCU-UHFFFAOYSA-N 0.000 description 1
- 101150110330 CRAT gene Proteins 0.000 description 1
- 101100226769 Caenorhabditis elegans fax-1 gene Proteins 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 238000010622 cold drawing Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 239000004035 construction material Substances 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000007872 degassing Methods 0.000 description 1
- 238000010894 electron beam technology Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 239000011261 inert gas Substances 0.000 description 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 238000001363 water suppression through gradient tailored excitation Methods 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Landscapes
- Extrusion Of Metal (AREA)
Abstract
Description
【発明の詳細な説明】
［産業上の利用分野］
この発明は、熱間押出によるクラッド形鋼の製造方法に
関する。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for manufacturing clad section steel by hot extrusion.
［従来の技術］
クラッド形鋼は、耐食性が重視される食品用棚、農業用
水門および建築部材等に使用されるものであって、近年
その需要が増えっ−ある。[Prior Art] Clad shaped steel is used for food shelves, agricultural water gates, construction parts, etc. where corrosion resistance is important, and the demand for it has been increasing in recent years.
クラット形鋼の製造方法として、鋳造法、冷間加工等に
よる被覆法、ロール圧延法が提案されているが、熱間押
出法の報告例は見られない。Casting methods, coating methods such as cold working, and roll rolling methods have been proposed as methods for producing crat section steel, but there have been no reports of hot extrusion methods.
鋳造法は長尺材の製造が困難、冷間加工等による被覆法
は母材とクラッド材の十分な金属接合が期待できず、剥
離し易いという欠点をもっている。ロール圧延法は母材
とクラッド材が金属接合し、同一寸法であれば生産性が
高く低コストで製造できる利点をもっている。なお、ロ
ール圧延法によって条材を製造する技術として、例えば
特開昭５９−２１２１．４３号公報に、ステンレス鋼ク
ラッド異形鉄筋製造法が開示されている。The casting method has the disadvantage that it is difficult to manufacture long materials, and the coating method using cold working etc. cannot expect sufficient metal bonding between the base material and the cladding material and is prone to peeling. The roll rolling method has the advantage that the base material and the cladding material are metallurgically bonded, and that if the dimensions are the same, the product can be manufactured at high productivity and at low cost. As a technique for manufacturing strips by a roll rolling method, for example, Japanese Patent Laid-Open No. 59-2121.43 discloses a method for manufacturing stainless steel clad deformed reinforcing bars.
［発明が解決しようとする課題］
しかしながら、形鋼は板とは違って、その形状・寸法の
多様性の故に、少量・多品種であり、連続して配置され
た圧延機のそれぞれのロールを各寸法毎に製作しなけれ
ばならず、ロール費用が高価となり、かえってコスト高
となる欠点がある。[Problem to be solved by the invention] However, unlike plates, shaped steel is produced in small quantities and in a wide variety of products due to its diversity in shape and size, and it is difficult to handle each roll of a rolling mill arranged in series. It has to be manufactured for each dimension, and roll costs are high, which has the drawback of increasing costs.
本発明は上記のような欠点を解消するべくなされたもの
で、少量、多品種のオーダーに対して、安価なりラッド
形鋼の製造法を提供することを目的としている。The present invention has been made in order to eliminate the above-mentioned drawbacks, and aims to provide an inexpensive method for manufacturing rad section steel for orders of small quantities and a wide variety of products.
［課題を解決するための手段］
この発明に係るクラッド形鋼の製造法は、母材とクラッ
ド材とを一体化したクラッド素材を、所定の熱間押出加
工温度に加熱し、熱間押出してクラッド形鋼を製造する
クラッド形鋼製造法である。[Means for Solving the Problems] A method for manufacturing a clad section steel according to the present invention involves heating a clad material in which a base material and a clad material are integrated to a predetermined hot extrusion temperature, and then hot extruding it. This is a clad steel manufacturing method for producing clad steel sections.
［実施例］
以下、本発明の一実施例を図面に基づいて説明する。先
ず、製造されるクラッド形鋼の使用目的が建築材等の装
飾用であって、防錆の場合においてはクラッド材の厚さ
が均一である必要がないので、クラッド素材の形状に特
別な配慮を払わなくともよい。しかし、その使用目的が
耐蝕性等を重視する場合には、クラッド材の厚さを均一
にするのが望ましいので、そのような場合の一実施例を
以下に説明する。[Example] Hereinafter, an example of the present invention will be described based on the drawings. First, the purpose of the manufactured clad section steel is for decorative purposes such as construction materials, and in the case of rust prevention, the thickness of the cladding material does not need to be uniform, so special consideration must be given to the shape of the cladding material. You don't have to pay. However, if the purpose of use is to emphasize corrosion resistance, it is desirable to make the thickness of the cladding material uniform, and one embodiment for such a case will be described below.
この実施例における基本的な考え方は、熱間押出後のク
ラット形鋼外面の対応周囲長比に応じて、母材外周を囲
繞するクラッド材を横断面方向で異なる厚さに増減した
クラッド素材とし、このクラッド素材の外周位置と熱間
押出後のクラッド形鋼外面位置との相対位置関係を保っ
て熱間押出を行うと云うものである。The basic idea in this example is to use cladding material that increases or decreases the thickness in the cross-sectional direction of the cladding material that surrounds the outer periphery of the base material, depending on the corresponding perimeter ratio of the outer surface of the clad section steel after hot extrusion. Hot extrusion is performed while maintaining the relative positional relationship between the outer circumferential position of the clad material and the outer surface position of the clad section steel after hot extrusion.
実施例として、クラッド形鋼が山形鋼である場合につい
て説明する。第１図に示すように、クラッド素材１を熱
間押出装置のコンテナーに装入して、全体としてメタル
フローが偏らない位置に対応するダイスの孔型からクラ
ッド山形鋼４を押し出す場合、クラッド山形鋼４のクラ
ッド材４２の厚さｔとクラッド素材１のクラッド材４２
の厚さｔｌどの関係は、押出比をμとし、クラッド素材
１の中心点Ｏがら円周方向に引いた２本の線が挟むクラ
ッド山形鋼４の周面の長さをΔＳ、同じくクラッド素材
１の周面の長さを八〇とすると、次の（１）式のように
表される。As an example, a case where the clad section steel is an angle steel will be described. As shown in Fig. 1, when a clad material 1 is charged into a container of a hot extrusion device and a clad angle steel 4 is extruded from a hole shape of a die corresponding to a position where the metal flow is not biased as a whole, the clad angle steel 4 is Thickness t of cladding material 42 of steel 4 and cladding material 42 of cladding material 1
The relationship between the thickness tl and If the length of the circumferential surface of 1 is 80, it is expressed as the following equation (1).
ｔ＝ｔ、ｘΔＣ／ΔＳ×１／μ ・・・（１）この（
１）式から明かなように、クラッド素材１のクラッド厚
さｔｌが周方向のどの位置においても一定であると、ク
ラッド山形鋼４のクラッド厚さｔはΔＣ／ΔＳによって
決まるが、この値はクラッド山形鋼４の各ポジションに
より異なるので、クラッド山形鋼４のクラッド厚さｔが
各ポジションで異なることになる。t=t, xΔC/ΔS×1/μ...(1) This (
1) As is clear from the equation, if the cladding thickness tl of the cladding material 1 is constant at any position in the circumferential direction, the cladding thickness t of the cladding angle steel 4 is determined by ΔC/ΔS, and this value is Since it differs depending on each position of the clad angle iron 4, the cladding thickness t of the clad angle iron 4 differs at each position.
そこで、クラッド素材１のクラッド厚さｔｌを、予めΔ
Ｃ／ΔＳに反比例した厚さに増減しておき、このクラッ
ド素材１の外周位置と熱間押出後のクラッド形鋼４の外
面位置との相対位置関係を保って熱間押出を行って、ク
ラッド形鋼４を製造すれば、クラッド材４２の厚さが均
一なりラッド形鋼を得ることができる。Therefore, the cladding thickness tl of the cladding material 1 is set in advance by Δ
The thickness is increased or decreased in inverse proportion to C/ΔS, and hot extrusion is performed while maintaining the relative positional relationship between the outer circumferential position of the clad material 1 and the outer surface position of the clad section steel 4 after hot extrusion. When the shaped steel 4 is manufactured, the thickness of the clad material 42 becomes uniform, and a rad shaped steel can be obtained.
具体的には、先ず第２図（ａ）に示すように、クラッド
素材１の中心○がらクラッド山形鋼４の各コーナ一部
Ａ、Ｂ、Ｃ，Ｄ、Ｅ、Ｆを結ぶ線をクラッド素材１の周
面まで延長し、山形鋼の各コーナ一部Ａ、Ｂ、Ｃ，Ｄ、
Ｅ、Ｆに対応するクラッド素材１周面の交点をそれぞれ
ａ、ｂ、ｃｄ、ｅ、ｆとする。クラッド山形［４のクラ
ッド材４２の厚さをｔとし、押出比をμとすると、クラ
ッド素材１各部のクラッド厚さｔｌは次ぎのようにする
。Specifically, as shown in FIG. 2(a), first, a portion of each corner of the clad angle iron 4 is removed from the center of the clad material 1.
Extend the lines connecting A, B, C, D, E, and F to the circumferential surface of the clad material 1, and connect each corner of the angle iron to a portion A, B, C, D,
Let the intersection points of one circumferential surface of the clad material corresponding to E and F be a, b, cd, e, and f, respectively. Assuming that the thickness of the clad material 42 of the clad chevron [4] is t and the extrusion ratio is μ, the clad thickness tl of each part of the clad material 1 is as follows.
ａｂ間； ｔ Ｘ Ａ Ｂ ／ ａ ｂ Ｘ １ ／
１１ｂｃ間、ｔｘβ−Ｃ／ ｂ ｃ Ｘ １ ／ μｃ
ｄ間； ｔ Ｘ ＣＤ ／ ｃ ｄ Ｘ １ ／ ｔｚ
ｄｅ間； ｔＸＤＥ／ｄｅｘｌ／μ
ｅｆ間； ｔ Ｘ Ｅ Ｆ ／ ｅ ｆ Ｘ １ ／
μｆａ間； ｔ Ｘ Ｆ Ａ ／ ｆ ａ Ｘ １ ／
μしたがって、クラッド素材１のクラッド材２の厚さ
は、ａｂ間及びｄｅ間ではＡ Ｂ ／ ａ ｂＤ Ｅ
／ ｄ ｅに応じて薄くするが、これに見合う分だけク
ラッド素材１の母材２を突出させる。Between ab; t X A B / a b X 1 /
Between 11bc, txβ-C/bcX1/μc
Between d; t X CD / c d X 1 / tz
between de; between tXDE/dexl/μ ef; tXEF/efX1/
Between μfa; tXFA/faX1/
μ Therefore, the thickness of the cladding material 2 of the cladding material 1 is A B / a bD E between ab and de.
/ d The base material 2 of the cladding material 1 is made to protrude by an amount commensurate with the thickness.
また、ｂｃ間及びｃｄ間では陽気／ヤーｃ、違ユＤ／ｃ
ｄに応じた中間の厚さとし、ｅｆ間、ｆａ間では影Ｆ／
ｅ ｆ 、ＦＡ／ｆ ａの各々に応じて厚くするととも
に、母材２の形状もこれに見合った形状とする。このよ
うなりラッド素材１の形状とクラッド山形＊４を得るべ
く配置した熱間押出装置のダイスの孔型との相対位置関
係を維持して熱間押出することにより、均一な厚さのク
ラッド材４ を有するクラッド形鋼を得ることができる
。Also, between bc and cd, cheerful / ya c, different yu D / c
Medium thickness according to d, and shadow F/ between ef and fa.
The thickness is increased according to each of e f and FA/f a, and the shape of the base material 2 is also adjusted accordingly. As described above, by hot extruding the clad material 1 while maintaining the relative positional relationship between the shape of the clad material 1 and the hole shape of the die of the hot extrusion device arranged to obtain the clad chevron *4, the clad material has a uniform thickness. 4 can be obtained.
第２図（ｂ）は、本発明の熱間押出法によるクラッド形
鋼の第２実施例を示すもので、クラッド素材１の母材２
は円筒状のものとし、このクラッド素材１を囲繞するク
ラッド材２の厚さは、ａｂ間及びｄｅ間では譚彰／ａｂ
、ＤＥ／ｄｅに応じて薄くするが、ｂｃ間及びｃｄ間で
はＢ Ｃ／ ｂ ｃ 。FIG. 2(b) shows a second embodiment of the clad section steel manufactured by the hot extrusion method of the present invention, in which the base material 2 of the clad material 1 is
is cylindrical, and the thickness of the cladding material 2 surrounding this cladding material 1 is tanhang/ab between ab and de.
, DE/de, but B C/ b c between b and c.
ＣＤ ／ ｃ ｄに応した中間の厚さとし、ｅｆ間、ｆ
ａ間ではＥＦ／ｅ ｆ 、ＦＡ／ｆ ａの各々に応じて
厚くした形状とする。このようなりラフ１〜素材１の形
状とクラッド山形鋼４を得るべく配置した熱間押出装置
のダイスの孔型との相対位置関係を維持して熱間押出す
ることにより、均一な厚さのクラッド材４２を有するク
ラッド形鋼を得ることができる。なお、Ｍ彰／ ａ ｂ
、影飢／垣二等を便宜上対応周囲長比と呼んでいる。CD/c The intermediate thickness corresponds to d, between ef, f
Between a, the thickness is made thicker depending on EF/e f and FA/f a. As described above, by hot extruding while maintaining the relative positional relationship between the shape of the rough 1 to material 1 and the hole shape of the die of the hot extrusion device arranged to obtain the clad angle steel 4, uniform thickness can be obtained. A clad section steel having the clad material 42 can be obtained. In addition, Maki/a b
, Kageki/Kakiji, etc. is called the corresponding perimeter ratio for convenience.
そして、このクラッド材２の製造方法としては、
（１）冷間引抜法により、凹凸のある環状材を製造する
、
（２）均一な肉厚の管材の内面または外面に、肉盛等に
より必要な肉厚を構成する、
等既存の技術の範囲で適宜選択すればよい。The manufacturing method for this cladding material 2 is as follows: (1) manufacturing an annular material with unevenness by cold drawing; (2) manufacturing the necessary material by overlaying, etc. on the inner or outer surface of a pipe material with uniform wall thickness. It may be selected as appropriate within the range of existing technologies, such as configuring a wall thickness of a certain thickness.
製造試験結果は第１表に示すが、製品でのクラッド材の
厚さが不均一でもよい場合には、通常管材等に使用して
いるクラッド厚さが均等なりラッド素材を用い、均一な
りラッド厚さが必要な製品には第２図の方式によって均
等なりラッド厚さのものを製造する。The manufacturing test results are shown in Table 1. If the thickness of the cladding material in the product does not need to be uniform, use a cladding material with a uniform cladding thickness that is normally used for pipe materials, etc. For products that require thickness, products with uniform or rad thickness are manufactured using the method shown in Figure 2.
第１表
なお、熱間押出してクラッド形鋼とするためのクラッド
素材は、クラッド材と母材との接合部に酸化物が発生す
るのを防止するために、酸素（空気）を排除した雰囲気
室で筒状のクラッド材の内部に母材を挿入して後、両端
部をシール接合することによって組立られる。このよう
な組立は、第３図に示すように、クラッド素材１のクラ
ッド材２を雰囲気室１１の底部に設置された気流誘導筒
１２上に載置し、外部より気流誘導筒１２に連通する配
管１３より不活性ガスまたは窒素等で空気と置換するな
り、真空ポンプで脱気した後、予めクラッド材２の上方
に待機させた母材３を挿入する。この後、端部を電子ビ
ーム溶接等でシール溶接して完成する。組立が完成した
クラッド素材１はその材質に応じた所定の熱間押出加工
温度に加熱される。熱間押出加工される材質と加熱温度
との関係は第２表に示す通りである。Table 1 Note that the clad material for hot extrusion to make clad section steel is prepared in an atmosphere excluding oxygen (air) to prevent the generation of oxides at the joint between the clad material and the base metal. After the base material is inserted into the cylindrical cladding chamber, both ends are sealed and assembled. As shown in FIG. 3, such an assembly involves placing the cladding material 2 of the cladding material 1 on the airflow guide tube 12 installed at the bottom of the atmosphere chamber 11, and communicating with the airflow guide tube 12 from the outside. After replacing the air with an inert gas, nitrogen, etc. through the piping 13 and degassing it with a vacuum pump, the base material 3 that has been placed on standby above the cladding material 2 is inserted. After this, the ends are sealed and welded using electron beam welding or the like. The assembled clad material 1 is heated to a predetermined hot extrusion temperature depending on the material. The relationship between the material to be hot extruded and the heating temperature is shown in Table 2.
所定の温度に加熱されたクラッド素材は、通常作業と同
様の手順で熱間押出が行なわれる。The cladding material heated to a predetermined temperature is hot extruded in the same manner as in normal operations.
また、本実施例はクラッド山形鋼を製造する場合につい
て説明したが、他の形状のクラッド形鋼を製造する場合
でも同じ方法により、クラッド厚さを決定すればよい。Furthermore, although this embodiment has been described with respect to manufacturing a clad angle steel, the same method may be used to determine the cladding thickness even when manufacturing a clad angle steel of another shape.
さらに、このクラッド素材を熱間押出するにあたっては
、第２図の位置関係のように、ダイス位置又は鋼片位置
を調整するだけで、それ以外に特別な配慮は必要ではな
く、従来と同様の手順で熱間押出を行えばよい。Furthermore, when hot extruding this clad material, as shown in the positional relationship in Figure 2, only the position of the die or the position of the steel billet is adjusted, and no other special consideration is required; Hot extrusion may be performed in the following steps.
［発明の効果コ
本発明により、熱間押出法にて商品価値の優れたクラッ
ド形鋼を得ることができるとともに、小ロツト多品種の
客先オーダーに即応でき、生産効率も優れ、ひいては経
済性も高まる等の産業上優れた効果を有する。[Effects of the invention] According to the present invention, it is possible to obtain a clad section steel with excellent commercial value using the hot extrusion method, and it is also possible to quickly respond to customer orders for small lots and a wide variety of products, and has excellent production efficiency, and is also economical. It has excellent industrial effects such as increasing the
第１図は本発明の熱間押出法によるクラッド形鋼製造法
の一実施例の概念を示す説明図、第２図（ａ＞、（ｂ）
は本発明の第１実施例及び第２実施例を示す説明図、第
３図はクラッド素材を組立るための装置の一実施例を示
す説明図である。
１・・・クラッド素材、２・・クラッド材、３・・・母
材、４・・・クラッド山形鋼、４２・・クラッド材、４
３・・・母材。Fig. 1 is an explanatory diagram showing the concept of an embodiment of the method of manufacturing clad section steel by hot extrusion method of the present invention, Fig. 2 (a>, (b))
FIG. 3 is an explanatory diagram showing a first embodiment and a second embodiment of the present invention, and FIG. 3 is an explanatory diagram showing an embodiment of an apparatus for assembling cladding materials. 1... Clad material, 2... Clad material, 3... Base material, 4... Clad angle steel, 42... Clad material, 4
3...Base material.
Claims (1)
の熱間押出加工温度に加熱し、熱間押出して形鋼とする
ことを特徴とする熱間押出によるクラッド形鋼製造法。A method for manufacturing clad section steel by hot extrusion, characterized by heating a clad material, which is an integrated base material and clad material, to a predetermined hot extrusion temperature and hot extruding it into a section steel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13761289A JPH035014A (en) | 1989-05-31 | 1989-05-31 | Manufacture of clad shape steel by hot extrusion |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13761289A JPH035014A (en) | 1989-05-31 | 1989-05-31 | Manufacture of clad shape steel by hot extrusion |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH035014A true JPH035014A (en) | 1991-01-10 |
Family
ID=15202753
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP13761289A Pending JPH035014A (en) | 1989-05-31 | 1989-05-31 | Manufacture of clad shape steel by hot extrusion |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH035014A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002523246A (en) * | 1998-08-27 | 2002-07-30 | フォース ツール アンド バルブ リミテッド | Pipe manufacturing method |
| CN114522997A (en) * | 2022-01-25 | 2022-05-24 | 邯郸新兴特种管材有限公司 | Integrated forming production method of stainless steel H-shaped steel |
-
1989
- 1989-05-31 JP JP13761289A patent/JPH035014A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002523246A (en) * | 1998-08-27 | 2002-07-30 | フォース ツール アンド バルブ リミテッド | Pipe manufacturing method |
| CN114522997A (en) * | 2022-01-25 | 2022-05-24 | 邯郸新兴特种管材有限公司 | Integrated forming production method of stainless steel H-shaped steel |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US4795078A (en) | Method for producing a clad steel pipe | |
| US4319121A (en) | Method of producing clad steel materials | |
| US4633056A (en) | Method for manufacturing special-section tubes for tubular heat exchangers and tubes provided by such method | |
| EP1737590B1 (en) | Method for local forming of a hollow workpiece | |
| US3297082A (en) | Heat exchangers of hollow construction | |
| JPH035014A (en) | Manufacture of clad shape steel by hot extrusion | |
| US3247583A (en) | Production of externally finned sheet stock | |
| US3206839A (en) | Fabrication of heat exchangers | |
| US6346684B1 (en) | Welding material assembly and method | |
| EP1034063B1 (en) | A method for producing rotational-symmetrical articles of sheet metal with double curved surface and varying thickness of material | |
| US5392625A (en) | Method of making non-planar article from roll bonded metal sheets | |
| US20230278085A1 (en) | Apparatus and method for pre-forming a metal strip for the manufacture of roll formed and welded tubes | |
| US3214949A (en) | Method and apparatus for expanding hollow articles | |
| US3004329A (en) | Heat exchanger and method of construction | |
| US2819884A (en) | Pressure-welded tubing | |
| US2987810A (en) | Metal working | |
| JPH02192816A (en) | Manufacture of clad section by hot extrusion | |
| US20020069925A1 (en) | Elbow protection cover and a method for producing it | |
| JPH04251612A (en) | Manufacture of square steel tube | |
| SU933133A1 (en) | Flange-type shaped metallic blank | |
| JP3292829B2 (en) | Method of manufacturing square steel pipe | |
| SU1579598A1 (en) | Method of producing multilayered tubes | |
| JP2023530920A (en) | embossing roll | |
| JPS6018230A (en) | Formation of bent pipe | |
| JP2001303661A (en) | Steel pipe column and manufacturing method thereof |