WO2004003241A1 - Procede de production d'un tuyau en acier sans soudure destine a un gonfleur pour airbag - Google Patents

Procede de production d'un tuyau en acier sans soudure destine a un gonfleur pour airbag Download PDF

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Publication number
WO2004003241A1
WO2004003241A1 PCT/JP2003/007435 JP0307435W WO2004003241A1 WO 2004003241 A1 WO2004003241 A1 WO 2004003241A1 JP 0307435 W JP0307435 W JP 0307435W WO 2004003241 A1 WO2004003241 A1 WO 2004003241A1
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WO
WIPO (PCT)
Prior art keywords
less
steel pipe
seamless steel
strength
toughness
Prior art date
Application number
PCT/JP2003/007435
Other languages
English (en)
Japanese (ja)
Inventor
Yukio Miyata
Kozo Takojima
Takao Kawate
Original Assignee
Jfe Steel Corporation
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
Priority claimed from JP2002186550A external-priority patent/JP3960145B2/ja
Priority claimed from JP2002234367A external-priority patent/JP2004076034A/ja
Application filed by Jfe Steel Corporation filed Critical Jfe Steel Corporation
Priority to US10/514,765 priority Critical patent/US20060070687A1/en
Priority to MXPA04010403A priority patent/MXPA04010403A/es
Priority to CA002476546A priority patent/CA2476546A1/fr
Priority to EP03733377A priority patent/EP1516935A4/fr
Publication of WO2004003241A1 publication Critical patent/WO2004003241A1/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
    • C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/10—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of tubular bodies
    • 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
    • C22C38/22—Ferrous alloys, e.g. steel alloys containing chromium with molybdenum or tungsten
    • 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
    • C22C38/38—Ferrous alloys, e.g. steel alloys containing chromium with more than 1.5% by weight of manganese
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/18—Hardening; Quenching with or without subsequent tempering
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/26—Methods of annealing
    • C21D1/28—Normalising

Definitions

  • the present invention relates to a high-strength seamless steel pipe, and particularly to a high-strength seamless steel pipe excellent in toughness and workability, which is suitable for an inflator of an airbag.
  • airbags have used a method of generating gas using explosives.
  • an inert gas such as argon at a low pressure
  • the inert gas must be kept at a high pressure in the inflator at all times, so the inflator must have sufficient strength.
  • inflators for airbags are manufactured by processing steel pipes.
  • the inert gas is filled into the inflator at a high pressure, and from the viewpoint of seam reliability, seamless steel pipes are used exclusively for inflator steel pipes. .
  • a seamless steel pipe is subjected to cold drawing to a predetermined size, cut to a predetermined length, and then processed at both ends by press working or the like, and a sealing plate is welded to obtain a product (inflator).
  • JP-A-10-140283 discloses that C: 0.01 to 0.20%, Si: 0.50% or less, Mn: 0.30 to 2.00%, P: 0.020% or less, S: 0.020% or less, A1: 0.10% or less, or Mo: 0.50% or less, V: 0.10% or less, Ni: 0.50% or less, Cr: 1.00% or less, Cu: 0.50% or less, Ti: 0.10% or less, Nb: 0.10% or less, B: Steel containing at least one of 0.005% or less, with the balance being Fe and unavoidable impurities, after being piped and then subjected to cold working, or after cold working, annealing and normalizing A method for producing a high-strength, high-toughness steel pipe for airbags, which is
  • Japanese Patent Application Laid-Open No. 10-140249 discloses that after steel having the same composition as that described in Japanese Patent Application Laid-Open No. 10-140283 is formed, the steel is annealed at 850 to 1000, and then cooled to a predetermined size.
  • Japanese Patent Application Laid-Open No. 10-140250 discloses a group described in Japanese Patent Application Laid-Open No. 10-140283.
  • JP-A-10-140283, JP-A-10-140249 and JP-A-10-140250 high dimensional accuracy, excellent workability and weldability, and tensile strength: 590 It is said that steel tubes for airbags with high strength and high toughness of N / mm 2 or more can be manufactured. Disclosure of the invention
  • curtain-type airbags require a large volume of gas so that the airbag can cover the front and rear side windows, and require a filling pressure of 50 MPa or more.
  • a seamless steel pipe that can be subjected to cold drawing and heat treatment, etc., and finally obtain a tensile strength of 900 MPa or more as an inflator is desired.
  • JP-A-10-140283, JP-A-10-140249, JP-A-10-140250 The technology described in (1) aims to manufacture a 590 MPa class high-strength seamless steel pipe, and has a problem that it cannot meet the demand for higher strength, which is desired for the above-mentioned steel pipe for inflators.
  • the present invention advantageously solves the above-mentioned problems of the prior art, is excellent in workability and weldability in manufacturing an inflator, and has a tensile strength of 900 MPa or more as an inflator, and an inflator for a half-sized copper tube.
  • An object of the present invention is to propose a method of manufacturing a high-strength, high-toughness, high-workability seamless steel pipe having high toughness showing ductility in a drop test in No. 60.
  • a seamless steel pipe with a steel composition containing an appropriate amount of Cr and Mo with a reduced C content is produced.
  • the seamless steel pipe is subjected to a cold drawing process. After that, a quenching and tempering process or a normalizing process is performed.
  • a seamless steel pipe with a steel composition containing an appropriate amount of Cr and Mo with a reduced C content is produced.
  • the seamless steel pipe is quenched and tempered or normalized. Thereafter, a cold drawing process is performed. It has been found that both of the above methods (1) and (2) can achieve high strength, and in particular, can provide a seamless steel pipe having a small decrease in circumferential strength and a small anisotropy.
  • the present invention has been completed based on the above findings and further studies. That is, the gist of the present invention is as follows.
  • the seamless steel pipe is heated to a temperature in the range of 850 to 1000 and air-cooled.
  • C is an element that contributes to the increase in the strength of steel, but when it is contained in excess of 0.10%, the workability and weldability are reduced. On the other hand, if the content is less than 0.01%, it becomes difficult to secure a desired tensile strength. Therefore, in the present invention, C is limited to the range of 0.01 to 0.10%. In addition, it is preferably 0.03 to 0.08%.
  • Si is an element that increases the strength of steel, and is preferably contained in an amount of 0.1% or more in order to obtain such an effect.However, an excessive content lowers ductility and workability, so in the present invention, Si is 0.5% or less. Limited to. Incidentally, the content is preferably 0.1 to 0.4%.
  • Mn is an element for improving the strength, and in order to secure a desired strength, the content of Mn is required to be 0.10% or more in the present invention. On the other hand, if the content exceeds 2.00%, ductility is reduced, and workability and weldability are reduced. For this reason, Mn was limited to 2.00% or less. In addition, Preferably, it is 1.00-: 1.70%.
  • Cr is an effective element for improving the strength and corrosion resistance of steel.
  • the content of more than 1.0% is required mainly to secure high strength.
  • the content exceeds 2.0% ductility is reduced, and further, workability, weldability and toughness are reduced.
  • Cr was limited to a range of more than 1.0% to 2.0%.
  • the content is 1.1 to 1.5%.
  • Mo is an element that increases the strength of steel and improves hardenability. Clearly, it is preferable to contain 0.1% or more. On the other hand, if the content exceeds 0.5%, the ductility is reduced and the resistance to weld cracking is reduced. For this reason, Mo was limited to 0.5% or less. The content is preferably 0.3% or less.
  • Cu 1.0% or less
  • Ni 1.0% or less
  • Nb 0.10% or less
  • V 0.10% or less
  • Ti 0.10% or less
  • B 0.005% or less
  • One or two or more selected from them can be contained.
  • Cu, Ni, Nb, V, Ti, and B all have the effect of increasing the strength, and one or more of them can be selected and contained as needed.
  • Cu is an element that increases the strength of steel and also improves corrosion resistance. However, if the content exceeds 1.0%, the hot workability decreases. For this reason, Cu is preferably limited to 1.0% or less. The content is more preferably 0.5% or less.
  • Ni is an element that increases the strength of the steel and improves the hardenability and toughness, but is expensive. Therefore, in the present invention, it is preferably limited to 1.0% or less. The content is more preferably 0.5% or less.
  • Nb is an element that increases the strength of steel by precipitation hardening and refines the structure to improve toughness. However, if it exceeds 0.10%, toughness will be degraded.
  • Nb is preferably limited to 0.10% or less.
  • the content is more preferably 0.01 to 0.05%.
  • V is an element that increases the strength of the steel by precipitation hardening and improves the hardenability, but if it exceeds 0.10%, the toughness deteriorates. Therefore, V is preferably limited to 0.10% or less. Note that the content is more preferably 0.01 to 0.05%.
  • Ti is an element that increases the strength of steel by precipitation hardening and refines the structure to improve toughness. However, if it exceeds 0.10%, the toughness will deteriorate.
  • Ti is preferably limited to 0.10% or less. Note that the content is more preferably 0.005 to 0.03%.
  • B is an element that contributes to an increase in strength through improvement in hardenability. However, if it exceeds 0.005%, toughness decreases. For this reason, B is preferably limited to 0.005% or less. Note that the content is more preferably 0.0005 to 0.002%.
  • the balance other than the above components is Fe and unavoidable impurities. Inevitable impurities Therefore, P: 0.03% or less, S: 0.01% or less, A1: 0.10% or less are acceptable.
  • the molten steel having the above composition is smelted by a known smelting method such as a converter or an electric furnace, and is made into a steel pipe material such as a billet by a known smelting method such as a continuous sintering method or an ingot slab method.
  • a known smelting method such as a converter or an electric furnace
  • a known smelting method such as a continuous sintering method or an ingot slab method.
  • the slab may be formed into a slab by a continuous manufacturing method or the like, and the slab may be formed into a billet by rolling.
  • the obtained steel pipe material is formed into a seamless steel pipe preferably using a normal Mannesmann-Plug mill method or a Mannesmann-Mandrel mill method.
  • a method other than the above-described method may be used.
  • One of the following two methods is applied to the formed seamless steel pipe. (1) After quenching and tempering or normalizing, perform cold drawing. (2) After cold drawing, quench and temper or normalize. The cold drawing process does not require a special device, and can be performed using a generally known cold drawing device.
  • the conditions of the cold drawing process need not be particularly limited as long as the steel tube can be made to have the specified dimensions.However, adjust the diameter reduction rate within the range of 5 to 25% and the thinning rate within the range of 10 to 30%. Is preferred from the viewpoint of ensuring dimensional accuracy.
  • the heating temperature for quenching is a temperature within the range from the Ac 3 transformation point to 1050. If the heating temperature is lower than the Ac 3 transformation point, uniform austenitization cannot be performed, while if the heating temperature is higher than 1050 :, the crystal grains become coarse and the toughness decreases. For this reason, the quenching heating temperature was set to be higher than or equal to the Ac 3 transformation point and lower than or equal to 1050 in the case of Honkiaki. After heating to a temperature within the above range, it is cooled (quenched) by water cooling or the like to obtain a quenched structure (martensite structure). Preferably, the quenching heating temperature is not lower than the Ac 3 transformation point and not higher than 950.
  • the tempering process is performed at a temperature within the range of 450 or more and below the A Cl transformation point.
  • the tempering temperature it is preferable to select a temperature at which strength, toughness and workability are simultaneously optimized. If the tempering temperature is less than 450 ⁇ , the tempering is insufficient and the desired toughness cannot be obtained. On the other hand, if the temperature exceeds the eighteen transformation point, a quenched structure cannot be obtained, and the strength decreases, and the desired strength cannot be secured. For this reason, the tempering temperature was limited to a temperature within the range of 450 or more and below the A Cl transformation point. In addition, it is preferably 500 to 700 t. Further, the cooling after tempering is preferably performed at a speed higher than air cooling.
  • the normalizing process is performed by heating to a temperature within the range of 850 to 1000 and air cooling. If the normalizing temperature is lower than 850, the austenite grains cannot be sufficiently homogenized. On the other hand, if the normalizing temperature is higher than 1000 ⁇ , the crystal grains become coarse and the desired toughness cannot be secured. For this reason, it is preferable to limit the normalizing temperature to 850 to 1000 ⁇ . Preferably, it is 850-950.
  • the seamless steel pipe is then preferably descaled by pickling and, if necessary, straightened to obtain a product pipe (steel pipe).
  • the seamless steel pipe manufactured by the above-described manufacturing method has high tensile strength: 900 MPa or more, and high toughness that shows ductility in a drop test at a temperature of 160 for a half-split steel pipe. This makes the steel pipe excellent in weldability and suitable for use in curtain-type airbag inflators.
  • a steel pipe material (billet: 140 mm) having the composition shown in Table 1 was heated to 1250 and drilled by the Mannesmann-mandrel mill method, elongation rolling, and diameter reduction rolling to form a seamless steel pipe (outer diameter: 34.0 mm).
  • mm ⁇ X thickness 3.2 mm
  • outer diameter 38.1 mm ⁇ X thickness: 3.3 mm).
  • these seamless steel pipes were subjected to cold drawing with a diameter reduction ratio of 11.8% and 8.9%, a wall thickness reduction ratio of 21.9% and 18.2%, and an outer diameter of 30.0 ⁇ ⁇ X thickness of 2.5 mm, outer diameter 34.7 mm ⁇ X 2.7 mm thick.
  • these steel pipes were subjected to quenching and tempering or normalizing treatment under the conditions shown in Table 2.
  • these heat-treated seamless steel pipes were straightened and bent to obtain product pipes.
  • Specimens were collected from the obtained product tubes and subjected to a tensile test to investigate the tensile properties in the longitudinal direction.
  • the tensile test was performed in accordance with JIS Z 2241 by sampling a No. 11 test piece (tubular test piece) specified in JIS Z 2201.
  • a hydraulic burst test was conducted, The tensile strength in the circumferential direction was converted from the burst pressure.
  • the obtained product pipe was subjected to a drop weight test at 60 ⁇ to investigate the toughness.
  • the drop weight test at 1-60 the product pipe was divided into semi-circular halves, and a weight of lOOkgf was dropped from a height of 500mm on it at -60 ⁇ . After the test, the fracture surface was observed to check for brittle fracture. The test was repeated three times, and the case where no brittle fracture occurred at all in the three tests was marked as ⁇ , the case where all brittle fractures occurred was marked as X, and the others were marked as ⁇ .
  • the end of the obtained product tube was reduced to an outer diameter of 20 mm or 25 mm by spatula drawing, cracks in the processed part were observed, and workability was evaluated.
  • the case where no cracks occurred was defined as workability ⁇ , and the case where cracks occurred was defined as workability X.
  • Each of the examples of the present invention has a tensile strength of 900 MPa or more and high toughness, is excellent in workability, and is a seamless steel pipe excellent in weldability.
  • the comparative examples outside the range of the present invention have a tensile strength of less than 900 MPa, reduced toughness, or reduced workability. Sufficient characteristics have not been obtained for steel pipes for curtain-type airbag inflators. Industrial applicability

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Manufacturing & Machinery (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Heat Treatment Of Articles (AREA)
  • Heat Treatment Of Steel (AREA)

Abstract

L'invention concerne un premier procédé de production d'un tuyau en acier sans soudure destiné à un airbag présentant une grande résistance et une excellente aptitude au formage, consistant à préparer un tuyau en acier sans soudure à partir d'un matériau renfermant 0,01 % à 0,10 % de C, 0,5 % ou moins de Si, 0,10 % à 2,00 % de Mn, plus de 1,0 % et jusqu'à 2,0 % de Cr et 0,5 % ou moins de Mo, à soumettre le tuyau en acier sans soudure à un traitement d'étirage à froid, à tremper et à faire revenir le tuyau en acier sans soudure résultant à une température comprise entre un point de transformation Ac3 et 1050 °C, à tremper le tuyau en acier, puis à faire revenir le tuyau en acier à une température comprise entre 450 °C et un point de transformation Ac1. L'invention concerne également un second procédé de production d'un tuyau en acier sans soudure consistant à soumettre le tuyau en acier sans soudure à un traitement d'étirage à froid une fois le tuyau trempé et revenu. Dans ces procédés, le matériau utilisé renferme également, de préférence, 1,0 % ou moins de Cu, 1,0 % ou moins de Ni, 0,10 % ou moins de Nb, 0,10 % ou moins de V, 0,10 % ou moins de Ti et 0,005 % ou moins de B.
PCT/JP2003/007435 2002-06-26 2003-06-11 Procede de production d'un tuyau en acier sans soudure destine a un gonfleur pour airbag WO2004003241A1 (fr)

Priority Applications (4)

Application Number Priority Date Filing Date Title
US10/514,765 US20060070687A1 (en) 2002-06-26 2003-06-11 Method for producing seamless steel pipe for inflator of air bag
MXPA04010403A MXPA04010403A (es) 2002-06-26 2003-06-11 Metodo para producir tubo de acero sin union para inflador de bolsas de aire.
CA002476546A CA2476546A1 (fr) 2002-06-26 2003-06-11 Procede de production d'un tuyau en acier sans soudure destine a un gonfleur pour airbag
EP03733377A EP1516935A4 (fr) 2002-06-26 2003-06-11 Procede de production d'un tuyau en acier sans soudure destine a un gonfleur pour airbag

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
JP2002-186550 2002-06-26
JP2002186550A JP3960145B2 (ja) 2002-06-26 2002-06-26 エアバッグ用高強度高靱性高加工性継目無鋼管の製造方法
JP2002234367A JP2004076034A (ja) 2002-08-12 2002-08-12 エアバッグ用高強度高靭性高加工性継目無鋼管の製造方法
JP2002-234367 2002-08-12

Publications (1)

Publication Number Publication Date
WO2004003241A1 true WO2004003241A1 (fr) 2004-01-08

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PCT/JP2003/007435 WO2004003241A1 (fr) 2002-06-26 2003-06-11 Procede de production d'un tuyau en acier sans soudure destine a un gonfleur pour airbag

Country Status (5)

Country Link
US (1) US20060070687A1 (fr)
EP (1) EP1516935A4 (fr)
CA (1) CA2476546A1 (fr)
MX (1) MXPA04010403A (fr)
WO (1) WO2004003241A1 (fr)

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EP1816227A4 (fr) * 2004-10-29 2008-08-27 Sumitomo Metal Ind Tuyau en acier pour dispositif de gonflage d'un air bag et procede de production de celui-ci
US7566416B2 (en) 2004-10-29 2009-07-28 Sumitomo Metal Industries, Ltd. Steel pipe for an airbag inflator and a process for its manufacture

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US20060169368A1 (en) * 2004-10-05 2006-08-03 Tenaris Conncections A.G. (A Liechtenstein Corporation) Low carbon alloy steel tube having ultra high strength and excellent toughness at low temperature and method of manufacturing the same
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MX2009004425A (es) * 2006-10-27 2009-06-30 Sumitomo Metal Ind Tubo de acero sin costura para un acumulador de bolsa de aire y un proceso para su fabricación.
WO2008123397A1 (fr) * 2007-03-29 2008-10-16 Sumitomo Metal Industries, Ltd. Tuyau en acier cémenté ayant une excellente aptitude au façonnage et son procédé de fabrication
RU2511452C2 (ru) * 2012-06-21 2014-04-10 Открытое Акционерное Общество "Дефорт" Способ термообработки оправок трубопрокатных станов
US9776592B2 (en) * 2013-08-22 2017-10-03 Autoliv Asp, Inc. Double swage airbag inflator vessel and methods for manufacture thereof
US11384415B2 (en) * 2015-11-16 2022-07-12 Benteler Steel/Tube Gmbh Steel alloy with high energy absorption capacity and tubular steel product
DE102016124852A1 (de) * 2016-12-19 2018-06-21 Benteler Steel/Tube Gmbh Rohrelement für Hydraulik- oder Pneumatikleitung, Verwendung des Rohrelementes und Verwendung eines Werkstoffes zur Herstellung eines Rohrelementes
CN107619994B (zh) * 2017-04-27 2019-04-02 中国石油大学(北京) 一种抗co2/h2s及硫酸盐还原菌腐蚀的无缝管线管及其制造方法
WO2021052317A1 (fr) * 2019-09-19 2021-03-25 宝山钢铁股份有限公司 Plaque/bande d'acier laminée à chaud résistante à la corrosion au point de rosée de l'acide sulfurique et procédé pour la fabriquer
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DE102020133765A1 (de) 2020-12-16 2022-06-23 Benteler Steel/Tube Gmbh Hochfestes Stahlrohr und Verfahren zum Herstellen eines hochfesten Stahlrohr

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Cited By (2)

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Publication number Priority date Publication date Assignee Title
EP1816227A4 (fr) * 2004-10-29 2008-08-27 Sumitomo Metal Ind Tuyau en acier pour dispositif de gonflage d'un air bag et procede de production de celui-ci
US7566416B2 (en) 2004-10-29 2009-07-28 Sumitomo Metal Industries, Ltd. Steel pipe for an airbag inflator and a process for its manufacture

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MXPA04010403A (es) 2005-02-17
US20060070687A1 (en) 2006-04-06
EP1516935A4 (fr) 2006-08-30
EP1516935A1 (fr) 2005-03-23
CA2476546A1 (fr) 2004-01-08

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