WO1999035298A1 - Raccord de tuyau en acier inoxydable a memoire de forme - Google Patents

Raccord de tuyau en acier inoxydable a memoire de forme Download PDF

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Publication number
WO1999035298A1
WO1999035298A1 PCT/CN1998/000275 CN9800275W WO9935298A1 WO 1999035298 A1 WO1999035298 A1 WO 1999035298A1 CN 9800275 W CN9800275 W CN 9800275W WO 9935298 A1 WO9935298 A1 WO 9935298A1
Authority
WO
WIPO (PCT)
Prior art keywords
stainless steel
alloy
shape memory
ring
memory
Prior art date
Application number
PCT/CN1998/000275
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English (en)
Chinese (zh)
Inventor
Wenxi Liu
Daozhi Liu
Fangyue Gong
Defa Wang
Original Assignee
Shape Memory Materials Engineering Research Center, Tianjin University
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 Shape Memory Materials Engineering Research Center, Tianjin University filed Critical Shape Memory Materials Engineering Research Center, Tianjin University
Priority to DE19882917T priority Critical patent/DE19882917T1/de
Priority to AU12228/99A priority patent/AU752608B2/en
Publication of WO1999035298A1 publication Critical patent/WO1999035298A1/fr

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/001—Ferrous alloys, e.g. steel alloys containing N
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/52—Ferrous alloys, e.g. steel alloys containing chromium with nickel with cobalt
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/58—Ferrous alloys, e.g. steel alloys containing chromium with nickel with more than 1.5% by weight of manganese

Definitions

  • the invention relates to a shape-memory stainless steel pipe joint, which belongs to the technical field of alloys.
  • the stress of shape memory alloy can induce the transformation of parent phase to martensitic phase, and at the same time, the parts made of the alloy undergo certain deformation on the macroscopic scale. If the above-mentioned parts are heated above the reverse transformation temperature, the martensite phase reverses into the parent phase, and the corresponding parts return to their original shape.
  • This kind of alloy with shape memory function is called shape memory alloy.
  • the martensite of general iron-based shape memory alloy is mostly hep type 2 H structure, commonly referred to as ⁇ martensite.
  • the parent phase ⁇ is a fee type 3 R structure, which can also be called alloy austenite.
  • the essence of the martensitic transformation of ⁇ is the change of atomic stacking order. Martensite has different types of combined stacking faults relative to the parent phase.
  • CN1064319A composition (wt%) is characterized by n: 15-35%, Si: 0. 2-6. ⁇ %, A1: 0. 2-8%, Cu: 0- 0. 5%, Pr, Pm, Eu, One or more of Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu, La, Ce, Nd, Sm, the amount is 0.008-0.12%, and the rest is iron and unavoidable impurity elements.
  • JP170457 composition characteristics is Mn: 15-40%, one or two kinds of Cr and Co, the amount is 1-20%, Si, Al, Ge, Ga, b, V, Ti, Cu, Ni, Mo one kind Or two or more, the addition amount is 15%, La, Ce, Nb, Sm, Y - one or more, the addition amount is 2%.
  • JP2270938A 0JSP5032195 composition feature is Mn: 15-20%, Si 3%, Cr > 10%, and the rest are iron and unavoidable impurity elements.
  • the composition of JP216946 is characterized by Mn: 15-30°/. , one or two kinds of Cr and Ni, the addition amount is 15%, and one or two kinds of Si and Co are added, the addition amount is 6%.
  • JP201761 (USP4780154) is characterized by Mn: 20- 0%, Si: 3.5-8%, and the following elements include at least -: Cr 10%, Ni ⁇ 10%, Co 10%, Mo 2%, C 1%, Al 1%, Ci 1%, and the rest are iron and unavoidable impurity elements.
  • the Mn content is above 15%. Due to the high n content, the overheating sensitivity of the alloy is relatively large, and it is difficult to control the thermal processing process. In addition, it is not easy to prevent rust, and even if Cr is added, it is difficult to significantly improve its corrosion resistance.
  • the following are patents and published literature with Mn below 15% -
  • JP2301514 is characterized by Cr:10-17%, Si:3.0-6.0%, at least one of the following elements: Mn:10-25%, Ni 7.0%, Co:2.0-10.0%, Ti, Zr, V, Xb, Mo , Cu and a small amount, and the rest are iron and unavoidable impurity elements.
  • EP 336157A JP2030734A, ISP4929289A
  • Composition features Cr:0.1-5.0%, Si:2.0-8.0%, Mn: 0.1-14.8%, Co:0.1-30%, Ni:0.1-2.0%, Cu:0.1-3 %, N:0.01-0.4%, the rest is Fe and unavoidable impurity elements.
  • USP 4933027 (EP336175A), its composition range is Cr: 5-20%, Si: 2.0-8.0%, at least one of the following elements M ⁇ : 0.1-14.8%, Ni: 0.1-2.0%, Co: 0.1-30.0 %, Cu:0.1-3.0%, N:0.001-0.4%, the rest are iron and unavoidable impurity elements.
  • EP 0506488A1 its composition range is Cr: 16-21%, Si: 3.0-7.0%, Ni: 11-21%, one or more of the following elements: ⁇ : 0. ⁇ - ⁇ .0%, Cu: 0.1-1.0%, N:0.001-0.100%, Mo:0.1-3.0%, W:0.1-3.0%, Ti:0.01-1.0%, Zr:0.011-2.0%, Hf:0.01-2.0%, V:0.01 -1.0%, Nb: 0.01-2.0%, Ta: 0.01-2.0%.
  • the yield strength is higher than 300Mpa
  • the memory recovery temperature is moderate (As: 60-120'C), corrosion-resistant and easy to process into materials.
  • the alloys listed in the above-mentioned patents and documents are difficult to meet the requirements of these three aspects simultaneously.
  • the object of the present invention is to provide a shape memory stainless steel that can meet the technical requirements of the above three aspects at the same time, and to use this material to make pipe connectors.
  • the present invention provides a shape memory stainless steel made of iron, manganese, silicon, chromium, nickel, etc., characterized in that the weight % range of the chemical composition is as follows:
  • the total content is 0.01-0.15, , Ti, V, Zi", Ta, Hf, W, Mo, A!, Cu elements one or more, with a total content of 0.05-2, and the rest are Fe and unavoidable impurity elements.
  • the preferred Cr, Si, Ni, Mn, Co and N content ranges by weight are: Cr.lZO-lS.O'SiJ.Z ⁇ .l'NiAO -S.OAtnUlO'Co O-ZO.O'N ⁇ .OS-O.
  • the difference between the present invention and the alloys listed in JP2301514 and Wilde documents is that 0.05-0.4%N is added, the purpose is to reduce the stacking fault energy, adjust the phase transition point, and at the same time improve the strength of the material.
  • the other difference between the present invention and EP336157A, USP4933027 is Containing carbonitride forming elements ⁇ b, Ti, V, Zr, Ta, Hf, W, Mo, can effectively reduce the overheating sensitivity of the material and improve the strength of the material.
  • Cr Ferrite forming element
  • the corrosion resistance effect is not significant if it is less than 5%, and generally Cr>12.0% can be used as stainless steel. Its influence on the stacking fault energy and phase transition point presents a relatively complex law. When it is less than 9%, the stacking fault energy is reduced, and if it is greater than 9%, Cr obviously increases the stacking fault energy and reduces the phase transition point, and at the same time promotes the formation of brittle 0 phase.
  • Cr is 12-20%, preferably 12.0-18.0%.
  • Ni It can strongly promote the formation of austenite and reduce the yield strength. Therefore, in the invention, the nickel content is controlled within the range of 0.1-8%, and is ideally 4.0-8.0%. Because nickel increases the stacking fault energy, a certain amount of elements such as Si and Mn should be added to reduce the stacking fault energy.
  • Si It can significantly reduce the stacking fault energy, so the Si content should generally be increased.
  • the effect of reducing stacking fault energy is weak when Si is less than 3%, and the processing performance is deteriorated if the Si content exceeds 7%. Therefore, the Si content in the present invention is 3-8%, and the ideal Si content is 3.2-6.1%.
  • N is an austenite forming element, which can significantly reduce the stacking fault energy and has the effect of stabilizing Ms points. Adding N can partially form carbonitrides, which has a good effect of suppressing thermal sensitivity. At the same time, N can improve the yield limit and pitting resistance of the alloy. But more than 0.4% is easy to form a large amount of nitrides, which will make the material brittle, so the N content is controlled at 0.050-0.40%, and the ideal is 0.05-0.2%.
  • Nb Including Ti, Ta, V, Zr, Hf, W and other carbon-nitride forming elements, which can fix carbon elements, prevent the precipitation of chromium carbides, and avoid the depletion of chromium and grain boundary corrosion. Simultaneous formation of fine carbides can prevent The grain grows to prevent the alloy from overheating at high temperature. 05 - 2% ⁇ Adding too much will cause intergranular brittleness, so its content is selected at 0. 05 - 2%.
  • Mo The purpose of adding molybdenum is to improve the ability to resist intergranular corrosion and stress corrosion. Mo is less than 0.05% and has no effect, and exceeding 2% will lead to deterioration of memory performance, so the amount of Mo added is controlled at 0.05-2% .
  • Cu is an austenite forming element, which can improve the corrosion resistance of the alloy, but at the same time increase the austenite stacking fault energy, too much will inhibit the formation of ⁇ martensite and deteriorate the memory performance. Generally, the addition of copper is controlled within 2%.
  • A1 Refine the grains to reduce the stacking fault energy and improve the memory performance of the alloy, but if the A1 content exceeds 2%, the processing performance will deteriorate, so the A1 content should be controlled within 2%.
  • one or more of the above Nb, Ti, V, Zr, Ta, Hf, W, Mo, Al or Cu elements can be selected, and the total content is 0.05-2%.
  • the alloy composition (wt%) should satisfy the following relationship:
  • the alloy composition (wt%) should satisfy the relationship:
  • the shape memory alloy of the present invention has high strength, good processability, moderate phase transition point and good corrosion resistance. Therefore, the shape-memory sleeve that utilizes the shape-memory stainless steel of the present invention to be made connects pipes.
  • Current similar products are for example: JP04069481A proposes to apply epoxy resin on the inner wall of the pipe sleeve for sealing when using Fe Mn Si alloy pipe sleeve to connect pipes.
  • JP05215277CN proposed that in addition to coating the sealant on the inner wall, the inner wall should also be engraved to enhance the effect of fastening connection.
  • CX21 16140 proposed a closed coating pipe connection structure for high reliability connection.
  • the present invention proposes a new, simple and practical pipe joint connection structure, as shown in FIG. 1 .
  • the structure of the invention is characterized by a memory stainless steel or alloy collar 1, an intermediate sealing ring 2, a ring end sealant 3 and a connected pipe 4.
  • the intermediate sealing ring is a solid high plastic alloy ring or a rubber ring or other high plastic material rings fixed on the inner middle part of the memory alloy collar.
  • the cross-section of the sealing ring can be circular, oval, rectangular, trapezoidal or other shaped.
  • Sealant is then coated on the resin, water glass or plastic inorganic paste or solid on the near end of the inner wall part of the memory alloy collar.
  • the intermediate sealing ring of the above structure and the sealant at the ring end can be used simultaneously or separately.
  • the middle sealing ring can play the role of axial front and rear positioning when installing the pipe, and is pressed and sealed by the pipes on both sides in the middle during assembly.
  • the sealant is only applied to the inner wall portion near the end of the shape memory alloy ring. In this way, while the sealing is ensured, it will not overflow into the inside of the pipe during the assembly process.
  • the memory alloy collar shrinks when heated, and tightens the pipe to achieve the purpose of connection. This kind of pipe joint is simple in structure, practical and economical, easy to install and reliable in use.
  • the alloy steel with different chemical composition (wt%) of the present invention is produced according to the conventional method of manufacturing shape memory stainless steel, and its performance is tested according to the conventional test method, and its memory performance, corrosion resistance, mechanical performance and processing performance are evaluated. If the test results meet the above performance indicators, the evaluation is "0", and if the test results do not meet the above performance indicators, the evaluation is "X”.
  • the composition and performance evaluation results of the 15 alloys tested are listed in Table 1.
  • the samples with alloy numbers 1-15 within the chemical composition range of the present invention exhibit good memory performance, corrosion resistance, mechanical properties and processing properties. And as the alloy number of the comparative example
  • the samples of 16-23 are not as good as the alloy steel of the present invention.
  • the sample of alloy No. 16 has poor memory performance and corrosion resistance because it does not contain rare earth elements.
  • the sample of alloy No. ⁇ has poor performance in other properties except for better corrosion resistance due to its high Si content.
  • the sample of alloy No. 18 has poor corrosion resistance due to too low Si content, and its memory performance and mechanical properties are also not good. Since the sample of alloy No. 19 does not contain X, it has poor properties except for easy processing.
  • the alloy No. 20 sample has poor corrosion resistance due to its low Cr content.
  • Alloy No. 21 has poor memory performance and corrosion resistance due to its low N content.
  • the samples of alloy Nos. 22 and 23 had n contents of 15% and 18%, respectively, which were higher than the Mn content of the present invention, so the corrosion resistance and processing performance deteriorated.
  • the connected ones are ⁇ 15.9 ⁇ 1min 304 austenitic stainless steel pipes, and the connected collar is the shape memory stainless steel of the present invention.
  • the specific chemical composition (wt%) is as follows: C: 0.02, Cr: 12.8, Si: 5.03, o: 1.02, Ni: 5.10, Mn: 14.13, Co: 3.0, N: 0.10, Ti : 0.20, Ce: 0.02, La: 0.03, and the rest are Fe and other unavoidable impurity elements.
  • the trained shape memory stainless steel collar has a length of 25 mm, a wall thickness of 1 mm, and an inner diameter of ⁇ 16 ⁇ 0.05 mm. Memory stainless steel is smelted in a 25kg vacuum induction furnace and poured into round ingots.
  • Memory stainless steel ingot heats up to 1100. C heat preservation for 6h, forging into a billet with a rectangular section of 50 X 20mm, and then hot rolling into a steel strip with a thickness of 3mm. After pickling, it is cold-rolled to 1mm thin plate, and bright annealed in the middle. After trimming, high-frequency welding is used to make memory stainless steel welded pipes. The pipe jacking test with a circular convex cone at a 90° angle proves that the plasticity of the weld is good. The training loading of the welded pipe adopts the rolling method of the mandrel and two outer plates, and the memory recovery of the empty casing reaches 2%. Only use resin sealant at both ends of the memory stainless steel collar during installation and connection.
  • Figure 1 Schematic of the structural method for connecting tubes utilizing shape-memory stainless steel.
  • the pipe joint can also be used for the connection of hot water pipes (mainly copper pipes), which is convenient and firm and can avoid the original brazing process.
  • hot water pipes mainly copper pipes
  • the stainless steel pipe used to protect the cable is difficult to construct with threaded connection, and the welding method is not allowed, so as not to damage the cable conductor.
  • a low-temperature connection method is required, and the shape-memory stainless steel pipe joint of the present invention is ideal for connecting stainless steel pipes of communication cables.
  • *K also contains «elements Pr, (3 ⁇ 4, Ho, Er, Tm, Yb, Lu3 ⁇ 4P'1 when adding I: the real «W ⁇ «0. 03

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Heat Treatment Of Steel (AREA)

Abstract

L'invention concerne un raccord de tuyau en acier inoxydable à mémoire de forme constitué de fer, de manganèse, de silicium et d'autres composés analogues, la composition chimique (exprimée en % en poids) renferme Cr:12-20, Si:3-8, Ni:0,1-8, Mn:0,1-14,8, Co:0,1-20, N:0,05-0,4, C:</=0,03, dont au moins un des éléments est un élément du groupe des lanthanides avec un poids total de 0,01-0,15, un ou plusieurs Nb, Ti, V, Zr, Ta, Hf, W, Mo, Al, Cu dont le poids total est de 0,05-2, le reste étant du Fer et des impuretés inévitables. Ce matériau obtenu par alliage présente des propriétés mécaniques, de tenue à la corrosion et de mémoire de forme meilleures. Cette structure de raccord présente une bonne étanchéité, une structure simple, est facile à utiliser et permet de résoudre de manière adéquate les problèmes de l'état de la technique.
PCT/CN1998/000275 1997-12-31 1998-11-19 Raccord de tuyau en acier inoxydable a memoire de forme WO1999035298A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
DE19882917T DE19882917T1 (de) 1997-12-31 1998-11-19 Rostfreier Stahl mit Formgedächtnis und Rohransatzstück aus diesem rostfreien Stahl mit Formgedächtnis
AU12228/99A AU752608B2 (en) 1997-12-31 1998-11-19 Pipe joint made of shape memory stainless steel

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN97126141.5 1997-12-31
CN97126141A CN1062060C (zh) 1997-12-31 1997-12-31 形状记忆不锈钢管接头

Publications (1)

Publication Number Publication Date
WO1999035298A1 true WO1999035298A1 (fr) 1999-07-15

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PCT/CN1998/000275 WO1999035298A1 (fr) 1997-12-31 1998-11-19 Raccord de tuyau en acier inoxydable a memoire de forme

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CN (1) CN1062060C (fr)
AU (1) AU752608B2 (fr)
DE (1) DE19882917T1 (fr)
WO (1) WO1999035298A1 (fr)

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US20080296014A1 (en) * 2007-05-30 2008-12-04 Baker Hughes Incorporated Interventionless composite packer
US20130160900A1 (en) * 2011-12-22 2013-06-27 Airbus Engineering Centre India SHAPE MEMORY STAINLESS STEELS WITH RARE EARTH ELEMENTS Ce AND La
CN103056355B (zh) * 2013-01-29 2015-01-21 大连海事大学 一种铁基合金激光熔覆粉末的制造及其使用方法
CN106641559B (zh) * 2016-11-23 2019-02-26 大连海航科技有限公司 一种剖分式形状记忆合金管接头及其制备和使用方法
CN108004484B (zh) * 2017-12-06 2019-09-10 新日鑫金属材料（深圳）有限公司 一种具有形状记忆功能的不锈钢材料的制备方法
CN108359978A (zh) * 2018-04-13 2018-08-03 贵州大学 一种铁基记忆合金激光熔覆复合涂层粉末及其制备和使用方法
CN109869549A (zh) * 2019-04-23 2019-06-11 中国工程物理研究院总体工程研究所 一种可拆卸抱管密封连接结构
CN111151756B (zh) * 2020-01-20 2021-12-03 广东省科学院新材料研究所 一种形状记忆合金管接头的4d打印快速制造方法及产品
CN114774805A (zh) * 2022-05-11 2022-07-22 沈阳大学 一种记忆型双相不锈钢及其制备

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62170457A (ja) * 1986-01-23 1987-07-27 Nippon Steel Corp 鉄基形状記憶合金
EP0489160A1 (fr) * 1989-08-25 1992-06-10 Nisshin Steel Co., Ltd. Acier inoxydable a effet memoire se caracterisant par une excellente resistance aux fissures de corrosion sous contraintes
CN1070693A (zh) * 1992-08-20 1993-04-07 北京科技大学 铁基形状记忆合金管道连接器及其生产方法
WO1997003215A1 (fr) * 1995-07-11 1997-01-30 Kari Martti Ullakko Alliages ferreux a memoire de forme et amortissement de vibrations, contenant de l'azote

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA1323511C (fr) * 1988-04-05 1993-10-26 Hisatoshi Tagawa Alliage de fer a memoire de formes a proprietes excellentes en rapport avec la memoire de formes, la resistance a la corrosion et la resistance a l'oxydation a haute temperature
JPH0328319A (ja) * 1989-06-26 1991-02-06 Nisshin Steel Co Ltd ステンレス鋼製のパイプ継手およびその製造法
US5174616A (en) * 1989-07-14 1992-12-29 Nkk Corporation Pipe coupling using shape memory alloy

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62170457A (ja) * 1986-01-23 1987-07-27 Nippon Steel Corp 鉄基形状記憶合金
EP0489160A1 (fr) * 1989-08-25 1992-06-10 Nisshin Steel Co., Ltd. Acier inoxydable a effet memoire se caracterisant par une excellente resistance aux fissures de corrosion sous contraintes
CN1070693A (zh) * 1992-08-20 1993-04-07 北京科技大学 铁基形状记忆合金管道连接器及其生产方法
WO1997003215A1 (fr) * 1995-07-11 1997-01-30 Kari Martti Ullakko Alliages ferreux a memoire de forme et amortissement de vibrations, contenant de l'azote

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Publication number Publication date
DE19882917T1 (de) 2001-10-04
AU1222899A (en) 1999-07-26
CN1062060C (zh) 2001-02-14
AU752608B2 (en) 2002-09-26
CN1192517A (zh) 1998-09-09

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