WO2009003326A1 - A process for continuous welding a composite pipe with outer stainless cladding layer - Google Patents

A process for continuous welding a composite pipe with outer stainless cladding layer Download PDF

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Publication number
WO2009003326A1
WO2009003326A1 PCT/CN2007/002870 CN2007002870W WO2009003326A1 WO 2009003326 A1 WO2009003326 A1 WO 2009003326A1 CN 2007002870 W CN2007002870 W CN 2007002870W WO 2009003326 A1 WO2009003326 A1 WO 2009003326A1
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Prior art keywords
stainless steel
pipe
composite pipe
composite
welded
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PCT/CN2007/002870
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French (fr)
Chinese (zh)
Inventor
Mengjie Yan
Biao Yan
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Mengjie Yan
Biao Yan
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Application filed by Mengjie Yan, Biao Yan filed Critical Mengjie Yan
Publication of WO2009003326A1 publication Critical patent/WO2009003326A1/en

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K9/00—Arc welding or cutting
    • B23K9/02—Seam welding; Backing means; Inserts
    • B23K9/032—Seam welding; Backing means; Inserts for three-dimensional seams
    • B23K9/0325—Seam welding; Backing means; Inserts for three-dimensional seams helicoidal seams
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C37/00—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
    • B21C37/06—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of tubes or metal hoses; Combined procedures for making tubes, e.g. for making multi-wall tubes
    • B21C37/08—Making tubes with welded or soldered seams
    • B21C37/09—Making tubes with welded or soldered seams of coated strip material ; Making multi-wall tubes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K1/00—Soldering, e.g. brazing, or unsoldering
    • B23K1/14—Soldering, e.g. brazing, or unsoldering specially adapted for soldering seams
    • B23K1/16—Soldering, e.g. brazing, or unsoldering specially adapted for soldering seams longitudinal seams, e.g. of shells

Definitions

  • the invention relates to a metal composite pipe manufacturing technology, in particular to a method for manufacturing a continuous welded outer stainless steel double-layer metal composite pipe.
  • the application of the outsourced stainless steel metal composite pipe is mainly based on the purpose of economy and resource conservation, and can reduce the usage of valuable or rare materials while satisfying the same use effect.
  • the traditional metal composite board is mainly processed by mechanical composite method, which has the disadvantages of low efficiency, complicated equipment and high manufacturing cost, and the bonding surface between the base metal and the double-layer metal is physically combined, and the bonding strength is low, so It is difficult to promote the application by bending, folding, welding, pressing and the like.
  • the inventor of the present invention has proposed a method for producing a metal composite panel using the solder compound according to the Chinese patent "a metal composite solder" (Patent No. ZL94108021. 7).
  • the technical problem to be solved by the present invention is to provide a method for manufacturing a continuously welded outer stainless steel double-layer metal composite pipe which is easy to manufacture and can be implemented on a conventional pipe-making unit.
  • a method for manufacturing a continuously welded outer stainless steel double-layer metal composite pipe comprising the following process steps: (1) determining the width dimension of the metal coil according to the diameter of the composite pipe; (2) unwinding (3) Cold rolling forming in the pipe making unit; (4) Welding into a pipe; (5) Cutting after finishing; wherein: the metal coil in step (1) is made of a composite metal coil of stainless steel and carbon steel, (4) Welding is performed using a stainless steel electrode, and a magnet is disposed inside the carbon steel of the welded portion.
  • the composite metal coil described in the above method for manufacturing a continuously welded outer stainless steel double-layered metal composite pipe may also be welded by a fixed-length metal composite plate.
  • Step (4) in the method for manufacturing a continuous welded outer stainless steel double-layer metal composite pipe 1 ⁇ 2 times of welding should be selected according to the wall thickness of the outer layer of stainless steel.
  • the tube is welded once, and when the thickness of the outer layer of stainless steel is less than >0.8 mm, the second one is welded into the tube.
  • the step (4) described in the method for manufacturing a continuous welded outer stainless steel double-layered metal composite pipe is provided with a magnet inside the carbon steel of the welded portion during welding. .
  • the composite pipe diameter described in the above-mentioned method for manufacturing a continuously welded outer stainless steel double-layer metal composite pipe is 9mn! ⁇ 316 legs.
  • the invention has the following advantages:
  • Figure 1 is a schematic illustration of the process flow of the present invention.
  • a manufacturing method of a continuously welded outer stainless steel double-layer metal composite pipe has the following process: determining the size of the composite metal coil, opening the coil, forming a tube, and cold-rolling a welded tube into a tube. After finishing and cutting, the steps are as follows:
  • the width dimension of the composite metal coil should be determined by calculation according to the size requirements of the composite pipe.
  • Welded into a tube Welded with a stainless steel electrode, and a magnet is placed in the carbon steel of the welded part.
  • the magnet can be a permanent magnet.
  • the function of the magnet is to adsorb the carbon steel by the magnet when the metal of the welded part is melted.
  • the effect is to transfer the melted carbon steel liquid to the carbon steel layer, but has no effect on the molten stainless steel, and achieve the purpose of layered welding; the welding should be selected according to the wall thickness of the outer stainless steel 1 ⁇ 2 times, in the outer stainless steel thickness When the thickness of the outer layer stainless steel is less than >0. 8mm, the tube is used for 2 times.
  • a composite coil having a stainless steel thickness of 0.25 and a carbon steel thickness of 1.5 is used as a composite metal coil to produce a 09 mm cold-rolled continuous welded outer stainless steel metal composite pipe.
  • the width of the composite metal coil is determined by calculation.
  • the composite strip with a thickness of 0.5 and a carbon steel of 2.5 is used as a composite metal coil to produce a 0160 mm cold-rolled continuous welded outer stainless steel metal composite pipe.
  • the width of the composite metal coil is determined to be 502IMK.
  • the composite metal coil is placed in the unwinder and then sent to the medium-sized pipe-making unit for cold rolling into a tubular shape, and the stainless steel electrode is used once in the joint portion. Continuously welded into a tube, and finally, the composite tube is finished and cut according to the required length, that is, a 0160 mm cold-rolled continuous welded outer stainless steel tube is obtained.
  • a composite strip coil having a thickness of 1. 0 and a carbon steel thickness of 5. 0 mm is used as a composite metal coil to produce a 0316 mm cold-rolled continuous welded outer stainless steel metal composite pipe.
  • the width of the composite metal coil is determined by calculation.
  • the composite metal coil is placed in the unwinding machine and then sent to the medium-sized pipe-making unit for cold rolling into a tubular shape.
  • the joint is welded continuously into a tube with 2 stainless steel welding rods.
  • the composite pipe is finished and finished as required. Long cutting, that is, 0316mm cold rolling continuous welding of stainless steel pipe.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Plasma & Fusion (AREA)

Abstract

A process for continuous welding a composite pipe with outer stainless cladding layer comprises steps as follows, (1) determining width dimension of a metal strip coil based on the pipe diameter of the composite pipe (S1), (2) unwinding (S2), (3) cold rolling formation in a pipe making machine set (S3), (4) welding to form pipe (S4), (5) cutting after finishing (S5), wherein a composite bimetal coil of stainless steel and carbon steel is used as the metal coil in step (1), and a stainless welding rod is used for welding in step (4). The process is easy to carry out and may be apply to a conventional pipe making machine set for producing the composite pipe.

Description

一种连续焊接外不锈钢复层金属复合管的制造方法 技术领域  Method for manufacturing continuous welded outer stainless steel double-layer metal composite pipe
本发明涉及一种金属复合管制造技术， 尤其是指一种连续焊接外不锈 钢复层金属复合管的制造方法。  The invention relates to a metal composite pipe manufacturing technology, in particular to a method for manufacturing a continuous welded outer stainless steel double-layer metal composite pipe.
背景技术  Background technique
外包不锈钢金属复合管的应用主要基于经济性和节约资源的目的， 在 满足同样的使用效果的前提下， 可以减少贵重或稀有材料的使用量。 传统 的金属复合板主要是采用机械复合方法加工制造， 存在功效低、 设备复杂、 制造成本高的不足， 而且基层金属和复层金属之间的结合面为物理结合， 其结合强度低， 因而不能进行弯、 折、 焊、 压等加工， 很难推广应用。 本 发明的发明人根据中国专利 "一种金属复合钎料"（专利号 ZL94108021. 7) 公幵的金属复合用钎料配方， 提出了利用该钎料配方生产金属复合板的方 法， 但该方法存在专用设备多、 设备投入大、 不能在普通的中型轧机生产 复合板等不足， 经发明人多年努力， 提出了 "用于生产热轧金属复合板的 钎焊复合坯"的专利申请（申请号： 200520056388. 3， 公开日： 2006年 6 月 28 日）， 利用该钎焊复合坯在普通的中型轧机轧制出各种规格的金属复 合板， 在此基础上， 更利用金属复合板开发出直接制造连续焊接外不锈钢 金属复合管的方法， 加工更加方便、 制造成本更低。  The application of the outsourced stainless steel metal composite pipe is mainly based on the purpose of economy and resource conservation, and can reduce the usage of valuable or rare materials while satisfying the same use effect. The traditional metal composite board is mainly processed by mechanical composite method, which has the disadvantages of low efficiency, complicated equipment and high manufacturing cost, and the bonding surface between the base metal and the double-layer metal is physically combined, and the bonding strength is low, so It is difficult to promote the application by bending, folding, welding, pressing and the like. The inventor of the present invention has proposed a method for producing a metal composite panel using the solder compound according to the Chinese patent "a metal composite solder" (Patent No. ZL94108021. 7). There are many special equipments, large equipment investment, and it is not possible to produce composite boards in ordinary medium-sized rolling mills. After years of efforts by the inventors, the patent application for "brale composite blanks for producing hot-rolled metal composite sheets" has been proposed (application number) : 200520056388. 3, Publication Date: June 28, 2006), the brazing composite slab is used to roll various metal composite plates in a common medium-sized rolling mill. Based on this, a metal composite plate is further developed. The method of directly manufacturing the continuous welded outer stainless steel metal composite pipe is more convenient to process and lower in manufacturing cost.
发明内容  Summary of the invention
本发明要解决的技术问题是提供一种制造容易， 可在普通制管机组上 实施的连续焊接外不锈钢复层金属复合管的制造方法。  The technical problem to be solved by the present invention is to provide a method for manufacturing a continuously welded outer stainless steel double-layer metal composite pipe which is easy to manufacture and can be implemented on a conventional pipe-making unit.
本发明的技术方案是这样的： 一种连续焊接外不锈钢复层金属复合管 的制造方法， 包括下述工艺步骤： （1 )根据复合管管径确定金属带卷的宽 度尺寸； （2)开卷； （3) 制管机组内冷轧成型； （4)焊接成管； （5) 精整 后切割；其中： 步骤（1 )中的金属带卷采用不锈钢与碳钢的复合金属带卷， 步骤（4)采用不锈钢焊条焊接，并且在焊接部的碳钢内侧设置磁体。  The technical solution of the present invention is as follows: A method for manufacturing a continuously welded outer stainless steel double-layer metal composite pipe, comprising the following process steps: (1) determining the width dimension of the metal coil according to the diameter of the composite pipe; (2) unwinding (3) Cold rolling forming in the pipe making unit; (4) Welding into a pipe; (5) Cutting after finishing; wherein: the metal coil in step (1) is made of a composite metal coil of stainless steel and carbon steel, (4) Welding is performed using a stainless steel electrode, and a magnet is disposed inside the carbon steel of the welded portion.
上述的一种连续焊接外不锈钢复层金属复合管的制造方法中所述的复 合金属带卷也可以由定尺金属复合板焊接而成。  The composite metal coil described in the above method for manufacturing a continuously welded outer stainless steel double-layered metal composite pipe may also be welded by a fixed-length metal composite plate.
上述的一种连续焊接外不锈钢复层金属复合管的制造方法中步骤 （4) 应根据外层不锈钢的壁厚选择 1〜2次焊接，在外层不锈钢厚度小于 0. 8π 时采用 1次焊接成管，在外层不锈钢厚度小于>0. 8mm时采用 2次焊接成管 上述的一种连续焊接外不锈钢复层金属复合管的制造方法中所述的步 骤（4)焊接时在焊接部的碳钢内侧设置磁体。 . Step (4) in the method for manufacturing a continuous welded outer stainless steel double-layer metal composite pipe 1~2 times of welding should be selected according to the wall thickness of the outer layer of stainless steel. When the thickness of the outer layer of stainless steel is less than 0.8 μm, the tube is welded once, and when the thickness of the outer layer of stainless steel is less than >0.8 mm, the second one is welded into the tube. The step (4) described in the method for manufacturing a continuous welded outer stainless steel double-layered metal composite pipe is provided with a magnet inside the carbon steel of the welded portion during welding. .
上述的一种连续焊接外不锈钢复层金属复合管的制造方法中所述的复 合管管径为 9mn！〜 316腿。  The composite pipe diameter described in the above-mentioned method for manufacturing a continuously welded outer stainless steel double-layer metal composite pipe is 9mn! ~ 316 legs.
本发明与现有技术相比， 具有下述优点：  Compared with the prior art, the invention has the following advantages:
( 1 )工艺简单， 可以直接在普通的制管机组上制造外不锈钢复合管。  (1) The process is simple, and the outer stainless steel composite pipe can be directly manufactured on the ordinary pipe making unit.
(2) 由于不需要专用设备， 制造成本更低， 因而市场前景广阔， 具有 很好的技术推广价值。  (2) Since there is no need for special equipment and the manufacturing cost is lower, the market prospect is broad and has a good technical promotion value.
附图说明  DRAWINGS
下面结合附图和实施例对本发明作进一步地详细说明， 但不构成对本 发明的任何限制。  The invention will be further described in detail below with reference to the accompanying drawings and embodiments, but without limitation of the invention.
图 1是本发明的工艺流程示意图。  BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 is a schematic illustration of the process flow of the present invention.
具体实施方式  detailed description
参阅图 1 所示， 本发明的一种连续焊接外不锈钢复层金属复合管的制 造方法， 其工艺流程为： 确定复合金属带卷的尺寸一开卷一制管机组内冷 轧成型一焊接成管一精整后切割， 现将各工序分述如下：  Referring to FIG. 1 , a manufacturing method of a continuously welded outer stainless steel double-layer metal composite pipe according to the present invention has the following process: determining the size of the composite metal coil, opening the coil, forming a tube, and cold-rolling a welded tube into a tube. After finishing and cutting, the steps are as follows:
( 1 )确定复合金属带卷的尺寸： 应根据复合管的尺寸要求， 通过计算 确定复合金属带卷的宽度尺寸。  (1) Determine the size of the composite metal coil: The width dimension of the composite metal coil should be determined by calculation according to the size requirements of the composite pipe.
( 2) 开卷： 直接将复合金属带卷放置在开卷机上开卷。  (2) Unwinding: Place the composite metal coil directly on the uncoiler to unwind.
(3)制管机组内冷轧成型： 将开卷后的复合金属带送入制管机组进行 冷轧成型。  (3) Cold rolling forming in the pipe making unit: The unrolled composite metal strip is sent to the pipe making unit for cold rolling forming.
(4)焊接成管： 采用不锈钢焊条悍接， 并且在焊接部的碳钢内恻设置 磁体， 磁体可采用永磁体， 磁体的作用是在焊接部的金属融化时， 利用磁 体对碳钢的吸附作用， 将融化的碳钢液向碳钢层迁移， 而对融化的不锈钢 没有影响，达到分层焊接的目的；焊接时应根据外层不锈钢的壁厚选择 1〜 2次焊接， 在外层不锈钢厚度小于 0. 8讓时采用 1次焊接成管， 在外层不 锈钢厚度小于〉0. 8mm时采用 2次悍接成管。  (4) Welded into a tube: Welded with a stainless steel electrode, and a magnet is placed in the carbon steel of the welded part. The magnet can be a permanent magnet. The function of the magnet is to adsorb the carbon steel by the magnet when the metal of the welded part is melted. The effect is to transfer the melted carbon steel liquid to the carbon steel layer, but has no effect on the molten stainless steel, and achieve the purpose of layered welding; the welding should be selected according to the wall thickness of the outer stainless steel 1~ 2 times, in the outer stainless steel thickness When the thickness of the outer layer stainless steel is less than >0. 8mm, the tube is used for 2 times.
(5)精整后切割： 精整后按工艺要求定尺切割， 得到连续焊接外不锈 钢金属复合管。 (5) After finishing and finishing: After finishing, cut according to the process requirements, and obtain continuous welding and stainless Steel metal composite pipe.
实施例 1  Example 1
采用不锈钢厚度为 0. 25讓、 碳钢厚度为 1. 5讓的复合带卷作为复合金 属带卷，生产 09 mm冷轧连续焊接外不锈钢金属复合管。  A composite coil having a stainless steel thickness of 0.25 and a carbon steel thickness of 1.5 is used as a composite metal coil to produce a 09 mm cold-rolled continuous welded outer stainless steel metal composite pipe.
首先根据复合管的尺寸要求， 通过计算确定复合金属带卷的宽度为 First, according to the size requirements of the composite pipe, the width of the composite metal coil is determined by calculation.
28讓、 将复合金属带卷放置在开卷机开卷后送入小型制管机组进行冷轧成 管状（送入时应使不锈钢层在下部），在结合部采用 1次不锈钢焊条连续焊 接成管， 最后， 对复合管进行精整、 按要求定长切割， 即得 09 讓冷轧连 续焊接外不锈钢管。 28, let the composite metal coils are placed in the unwinder and then sent to the small pipe-making unit for cold rolling into a tubular shape (the stainless steel layer should be placed in the lower part when feeding), and the stainless steel welding rod is continuously welded into the pipe at the joint. Finally, the composite pipe is finished and cut according to the required length, that is, 09 is allowed to continuously weld the outer stainless steel pipe by cold rolling.
实施例 2  Example 2
采用不锈钢厚度为 0. 5 讓、 碳钢厚度为 2. 5画的复合带卷作为复合金 属带卷,生产 0160 mm冷轧连续焊接外不锈钢金属复合管。  The composite strip with a thickness of 0.5 and a carbon steel of 2.5 is used as a composite metal coil to produce a 0160 mm cold-rolled continuous welded outer stainless steel metal composite pipe.
首先根据复合管的尺寸要求 通过计算确定复合金属带卷的宽度为 502IMK将复合金属带卷放置在开卷机开卷后送入中型制管机组进行冷轧成 管状,在结合部釆用 1次不锈钢焊条连续焊接成管， 最后， 对复合管进行精 整、 按要求定长切割， 即得 0160 mm冷轧连续焊接外不锈钢管。  Firstly, according to the size requirements of the composite pipe, the width of the composite metal coil is determined to be 502IMK. The composite metal coil is placed in the unwinder and then sent to the medium-sized pipe-making unit for cold rolling into a tubular shape, and the stainless steel electrode is used once in the joint portion. Continuously welded into a tube, and finally, the composite tube is finished and cut according to the required length, that is, a 0160 mm cold-rolled continuous welded outer stainless steel tube is obtained.
实施例 3  Example 3
采用不锈钢厚度为 1. 0 讓、 碳钢厚度为 5. 0mm的复合带卷作为复合金 属带卷，生产 0316mm冷轧连续焊接外不锈钢金属复合管。  A composite strip coil having a thickness of 1. 0 and a carbon steel thickness of 5. 0 mm is used as a composite metal coil to produce a 0316 mm cold-rolled continuous welded outer stainless steel metal composite pipe.
首先根据复合管的尺寸要求 通过计算确定复合金属带卷的宽度为 First, according to the size requirements of the composite pipe, the width of the composite metal coil is determined by calculation.
992mm,将复合金属带卷放置在开卷机开卷后送入中型制管机组进行冷轧成 管状,在结合部采用 2次不锈钢焊条连续焊接成管， 最后， 对复合管进行精 整、 按要求定长切割， 即得 0316mm冷轧连续焊接外不锈钢管。 992mm, the composite metal coil is placed in the unwinding machine and then sent to the medium-sized pipe-making unit for cold rolling into a tubular shape. The joint is welded continuously into a tube with 2 stainless steel welding rods. Finally, the composite pipe is finished and finished as required. Long cutting, that is, 0316mm cold rolling continuous welding of stainless steel pipe.
采用本发明的方法， 可生产公称直径 09 腿〜 0316丽的各种冷乳连续焊接 外不锈钢金属复合管，满足市场的需要。 By adopting the method of the invention, various cold milk continuous welded outer stainless steel metal composite pipes with a nominal diameter of 09 legs to 0316 丽 can be produced to meet the needs of the market.

Claims

权 利 要 求 书 Claim
1. 一种连续焊接外不锈钢复层金属复合管的制造方法， 包括下述工艺 步骤： （1 )根据复合管管径确定金属带卷的宽度尺寸； （2 ) 开卷； （3 )制 管机组内冷轧成型； （4)焊接成管； （5)精整后切割； 其特征是： 步骤（1 ) 中的金属带卷采用不锈钢与碳钢的复合金属带卷， 步骤（4)采用不锈钢焊 条焊接。 A method for manufacturing a continuously welded outer stainless steel double-layer metal composite pipe, comprising the following process steps: (1) determining a width dimension of the metal coil according to the diameter of the composite pipe; (2) unwinding; (3) pipe making unit Internal cold-rolling forming; (4) welding into a tube; (5) finishing after cutting; characterized by: the metal strip in step (1) is made of a composite metal coil of stainless steel and carbon steel, and step (4) is made of stainless steel. Welding rod welding.
2. 根据权利要求 1所述的一种连续焊接外不锈钢复层金属复合管的制 造方法， 其特征是： 所述的复合金属带卷也可以由定尺金属复合板焊接而 成。  2. The method of manufacturing a continuously welded outer stainless steel double layer metal composite pipe according to claim 1, wherein: said composite metal coil can also be welded by a fixed length metal composite plate.
3. 根据权利要求 1所述的一种连续焊接外不锈钢复层金属复合管的制 造方法， 其特征是： 步骤（4)应根据外层不锈钢的壁厚选择 1〜2次焊接， 在外层不锈钢厚度小于 0. 8mm时采用 1次焊接成管，在外层不锈钢厚度小 于〉 0. 8皿时采用 2次焊接成管。  3. The method for manufacturing a continuously welded outer stainless steel double-layer metal composite pipe according to claim 1, wherein: step (4) is selected according to the wall thickness of the outer stainless steel 1 to 2 times, in the outer stainless steel. When the thickness is less than 0. 8mm, the tube is welded once, and when the thickness of the outer layer of stainless steel is less than > 0.8, the tube is welded twice.
4. 根据权利要求 1或 3任一所述的一种连续焊接外不锈钢复层金属复 合管的制造方法， 其特征是： 所述的步骤 （4)焊接时在焊接部的碳钢内 侧设置磁体。  The method for manufacturing a continuously welded outer stainless steel double-layer metal composite pipe according to any one of claims 1 to 3, wherein: (4) said step (4) is to provide a magnet inside the carbon steel of the welded portion during welding. .
5. 根据权利要求 1所述的一种连续焊接外不锈钢复层金属复合管的制 造方法， 其特征是： 所述的复合管管径为 9mm〜316腿。  5. The method of manufacturing a continuously welded outer stainless steel double layer metal composite pipe according to claim 1, wherein: the composite pipe has a pipe diameter of 9 mm to 316 legs.
PCT/CN2007/002870 2007-06-29 2007-09-29 A process for continuous welding a composite pipe with outer stainless cladding layer WO2009003326A1 (en)

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