US20030000611A1 - Method for continuous heat-treatment of metals under argon atmosphere - Google Patents

Method for continuous heat-treatment of metals under argon atmosphere Download PDF

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Publication number
US20030000611A1
US20030000611A1 US10/137,838 US13783802A US2003000611A1 US 20030000611 A1 US20030000611 A1 US 20030000611A1 US 13783802 A US13783802 A US 13783802A US 2003000611 A1 US2003000611 A1 US 2003000611A1
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US
United States
Prior art keywords
furnace
heat
metallic alloy
treating
atmosphere
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.)
Abandoned
Application number
US10/137,838
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English (en)
Inventor
Susumu Takahashi
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Kanto Yakin Kogyo Co Ltd
Original Assignee
Kanto Yakin Kogyo Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Kanto Yakin Kogyo Co Ltd filed Critical Kanto Yakin Kogyo Co Ltd
Assigned to KANTO YAKIN KOGYO K.K. reassignment KANTO YAKIN KOGYO K.K. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: TAKAHASHI, SUSUMU
Publication of US20030000611A1 publication Critical patent/US20030000611A1/en
Abandoned legal-status Critical Current

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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
    • B23K1/00—Soldering, e.g. brazing, or unsoldering
    • B23K1/008—Soldering within a furnace
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
    • B22F3/10—Sintering only
    • B22F3/1003—Use of special medium during sintering, e.g. sintering aid
    • B22F3/1007—Atmosphere
    • 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
    • C21D1/74—Methods of treatment in inert gas, controlled atmosphere, vacuum or pulverulent material
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
    • C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
    • C22F1/02—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working in inert or controlled atmosphere or vacuum
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
    • F27B9/00—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity
    • F27B9/14—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity characterised by the path of the charge during treatment; characterised by the means by which the charge is moved during treatment
    • F27B9/20—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity characterised by the path of the charge during treatment; characterised by the means by which the charge is moved during treatment the charge moving in a substantially straight path tunnel furnace
    • F27B9/24—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity characterised by the path of the charge during treatment; characterised by the means by which the charge is moved during treatment the charge moving in a substantially straight path tunnel furnace being carried by a conveyor
    • F27B9/243—Endless-strand conveyor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F2998/00—Supplementary information concerning processes or compositions relating to powder metallurgy
    • 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
    • C21D1/74—Methods of treatment in inert gas, controlled atmosphere, vacuum or pulverulent material
    • C21D1/76—Adjusting the composition of the atmosphere
    • 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
    • C21D2241/00—Treatments in a special environment
    • C21D2241/01—Treatments in a special environment under pressure
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
    • F27B9/00—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity
    • F27B9/30—Details, accessories, or equipment peculiar to furnaces of these types
    • F27B9/38—Arrangements of devices for charging
    • F27B2009/382—Charging
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
    • F27B9/00—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity
    • F27B9/30—Details, accessories, or equipment peculiar to furnaces of these types
    • F27B9/38—Arrangements of devices for charging
    • F27B2009/384—Discharging
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
    • F27B9/00—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity
    • F27B9/04—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity adapted for treating the charge in vacuum or special atmosphere
    • F27B9/045—Furnaces with controlled atmosphere
    • F27B9/047—Furnaces with controlled atmosphere the atmosphere consisting of protective gases
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
    • F27B9/00—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity
    • F27B9/14—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity characterised by the path of the charge during treatment; characterised by the means by which the charge is moved during treatment
    • F27B9/147—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity characterised by the path of the charge during treatment; characterised by the means by which the charge is moved during treatment the charge moving on an inclined floor
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D3/00—Charging; Discharging; Manipulation of charge
    • F27D3/12—Travelling or movable supports or containers for the charge
    • F27D2003/121—Band, belt or mesh

Definitions

  • This invention relates to a novel method for continuously heat-treating metals under an inert gas atmosphere within a tunnellike continuous furnace.
  • the metals are particularly those alloys which contain one or more volatile metals such as zinc, manganese, chromium, aluminium, and so on. These metals may also be termed vaporizable, or as those which will easily be sublimated.
  • the inert gas atmosphere is primarily argon.
  • Heat-treatment of such alloys may be exampled by brazing stainless steel sheets or plates with a nickel-base solder containing chromium. This kind of heat-treatment can scarcely be performed under vacuum, because the solder will be dechromized. This type of brazing can neither be achieved under a nitrogen atmosphere, because chromium contained in the solder will be nitrided. Thus, this kind of brazing has been manually conducted piece by piece in the air.
  • the inventor has observed that in a tunnellike continuous furnace which is operated generally under an atmosphere of 0.1 to 0.5 Pa, its atmospheric pressure within the furnace can be elevated, when an argon gas is employed as the furnace atmosphere, because it has a specific gravity of 1.783Kg/m 3 which is considerably higher than the specific gravity of air of 1.293Kg/m 3 .
  • the argon furnace atmosphere which is inert, shall not cause a chemical change of metal alloy parts and articles to be heat-treated. Even when they contain volatile zinc, manganese, chromium, and/or aluminium, a high furnace atmospheric pressure sustained by argon shall prevent these volatile metals from vaporing from them.
  • Such high furnace atmospheric pressure can easily achieve the sealing of furnace inlet and outlet against the outer atmosphere, while such sealing has been a problem.
  • such high furnace atmospheric pressure makes it easy to purge out from a furnace those airs and other disturbance which are unavoidably brought into the furnace together with parts or articles to be heat-treated in the furnace.
  • Foreign materials such as machine oils which are burnt out from the parts or articles, shall also be discharged out easily from the furnace.
  • FIG. 1 is an explanatory sectional view of a tunnellike continuous furnace which can advantageously be employed for carrying out this invention method
  • FIG. 2 is a graph showing vapor pressures of volatile metals including zinc and others in relation with temperatures
  • FIG. 3 is a view similar to FIG. 1, showing another tunnellike continuous furnace.
  • the continuous furnace has a heating chamber 1 , and a preheating chamber 2 and a cooling chamber 3 located at either side of the heating chamber.
  • the chambers are connected each other to make a tunnellike furnace.
  • the furnace has an inlet 4 and an outlet 5 adjacently to its both ends, and forms as a whole and at its cross section a U-shape with the heating chamber as its base.
  • Walls of the heating chamber 1 are preferably made from carbonous materials, so that when oxygen or oxygen compounds get casually mixed with a furnace atmosphere as a disturbance thereof, they shall be reacted with the carbonous walls, converted to carbon monoxide, and partly or wholly adsorbed into the walls, whereby an oxygen partial pressure in the furnace atmosphere can constantly be kept extremely low.
  • An endless mesh belt 6 which is also made preferably from carbonous materials, circulates within the furnace. It is moved by driving rollers 7 in the direction illustrated by arrows.
  • a return passage 8 through which the unloaded belt 6 travels, is also hermetically sealed against the air, so that the argon gas which is supplied into the furnace from a supply pipe 9 located upward the heating chamber 1 , can be sealed totally in the furnace.
  • the inlet 4 works as a charging opening and the outlet 5 as a discharging opening for parts or articles which are to be or have been heat-treated, these openings which stand erect above a general height of the furnace or at least above the heating chamber 1 , work also as heads having a height H above a horizontal level of the loaded belt 6 .
  • the argon pressure (Pa) inside the furnace varies accordingly as follows. Height of Heads: 300 600 1200 2400 4800 Furnace Inner Pressure: 5.0 10.0 19.3 38.5 77.2
  • test pieces SUS304 stainless steel sheets containing 18% of Cr and 8% of Ni were employed as test pieces.
  • the test pieces were brazed with nickel-based solder BNi-5 containing 19% of Cr at 1,200° C. In this instance, the height of heads 4 , 5 were set 300mm (corresponding furnace inner argon pressure: 5.0 Pa).
  • the test pieces thus brazed were immersed in deionized water with 5 wt % of NaCl. Even when they were in the water for 96 hours, no rust was found on them. They did not change color.
  • Test pieces were made by molding powders of stainless steel SUS447J1 containing 30% of Cr. They were sintered at 1,300° C. in the furnace with the heads 4, 5 of 300 mm height (viz., under the argon furnace atmosphere of 5.0 Pa).
  • test pieces which had been sintered were immersed in deionized water with 5 wt % of NaCl, resulting in that no rust was observed even after the immersion for 46 hours. They did not change color.
  • Brass sheets containing 30% of zinc were brazed in the furnace at 700° C. with a BAg-7 solder containing 18% of zinc.
  • Powders of low nickel austenitic stainless steel containing 30% of Mn were molded under pressure to test pieces. They were heated at 1,300° C. in the furnace with the heads of a 600 mm height or higher (viz., under the argon furnace atmosphere of 10.0 Pa or higher). They were sintered well and were not rid of Mn.
  • FIG. 3 Another tunnellike continuous furnace which is illustrated in FIG. 3.
  • FIG. 3 those parts which are same to those of FIG. 1, are represented by the same reference numerals.
  • an inlet 4′ is made of a passage which has an incidence angle of ⁇ and forms a head of height H
  • an outlet 5 ′ is made of another passage which has a corresponding reflection angle of ⁇ ′ and forms a head of the same height H.
  • a return path of the belt 8 ′ may not necessarily be hermetically sealed from the air.
  • This type of inlet and outlet passages can advantageously be employed to readily charge and discharge metallic alloy articles into and from the furnace. It is matter of course that heads of a higher height, that is, a higher argon furnace atmosphere may be obtained by increasing the slanting angles and/or elongating the inlet and outlet tubular passages 4 ′ and 5 ′.
  • alloy articles containing volatile metals such as zinc, manganese, chromium, aluminium, and the like can be subjected to various heat-treatments positively and continuously in accordance with this invention. Since a furnace atmosphere of a high pressure is readily attained in this invention, it becomes easier to shelter an inlet and outlet of a tunnellike continuous furnace from the air, resulting in avoiding polluting the furnace atmosphere by the air. Accordingly, consumption of argon atmosphere gas is much saved.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Thermal Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Manufacturing & Machinery (AREA)
  • General Engineering & Computer Science (AREA)
  • Tunnel Furnaces (AREA)
  • Powder Metallurgy (AREA)
  • Furnace Details (AREA)
  • Manufacture And Refinement Of Metals (AREA)
US10/137,838 2001-06-19 2002-05-03 Method for continuous heat-treatment of metals under argon atmosphere Abandoned US20030000611A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2001184844A JP2003003211A (ja) 2001-06-19 2001-06-19 アルゴン雰囲気下での金属の連続熱処理方法
JP2001-184844 2001-06-19

Publications (1)

Publication Number Publication Date
US20030000611A1 true US20030000611A1 (en) 2003-01-02

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US (1) US20030000611A1 (de)
EP (1) EP1270749B1 (de)
JP (1) JP2003003211A (de)
DE (1) DE60207933T2 (de)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2562598C2 (ru) * 2014-01-09 2015-09-10 Акционерное общество "Информационные спутниковые системы" имени академика М.Ф. Решетнева" Способ закалки стальных деталей
WO2014162196A3 (en) * 2013-04-04 2015-12-10 Toyota Jidosha Kabushiki Kaisha Stainless steel and method of manufacturing the same
US9790580B1 (en) * 2013-11-18 2017-10-17 Materion Corporation Methods for making bulk metallic glasses containing metalloids
DE102019135295A1 (de) * 2019-12-19 2021-06-24 Benteler Automobiltechnik Gmbh Verfahren zur Herstellung einer Beschichtung auf Profilbauteilen aus Stahlblech
CN116571831A (zh) * 2023-07-11 2023-08-11 成都国营锦江机器厂 一种发动机燃油总管焊接工装、系统及焊接方法

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JP2004050223A (ja) * 2002-07-19 2004-02-19 Denso Corp アルミニウム製品のろう付け方法とその炉
JP4537019B2 (ja) * 2003-06-04 2010-09-01 古河スカイ株式会社 アルミニウム材のろう付け方法
JP4569860B2 (ja) * 2004-03-11 2010-10-27 関東冶金工業株式会社 ステンレス鋼部分を含む製品の加熱ろう付け方法
DE102007029302A1 (de) * 2007-06-22 2009-01-02 Behr Gmbh & Co. Kg Durchlaufofen
KR101151569B1 (ko) * 2009-10-26 2012-05-31 주식회사 경동나비엔 스테인리스 스틸 접합방법

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US3522020A (en) * 1966-01-03 1970-07-28 Iit Res Inst Stainless steels
GB2108156B (en) * 1981-09-19 1986-01-15 British Oxygen Co Ltd Heat treatment of metals
JPH0525554A (ja) * 1991-07-16 1993-02-02 Saamaru:Kk 金属体の連続熱処理装置
JP3324004B2 (ja) * 1993-02-22 2002-09-17 関東冶金工業株式会社 ろう付方法
US5629091A (en) * 1994-12-09 1997-05-13 Ford Motor Company Agglomerated anti-friction granules for plasma deposition
JP4419160B2 (ja) * 1999-03-19 2010-02-24 関東冶金工業株式会社 加熱炉雰囲気の保護方法と雰囲気加熱炉
JP3354922B2 (ja) * 2000-11-15 2002-12-09 福田金属箔粉工業株式会社 Ｎｉ基耐熱ろう材

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2014162196A3 (en) * 2013-04-04 2015-12-10 Toyota Jidosha Kabushiki Kaisha Stainless steel and method of manufacturing the same
US10619950B2 (en) 2013-04-04 2020-04-14 Toyota Jidosha Kabushiki Kaisha Stainless steel and method of manufacturing the same
US9790580B1 (en) * 2013-11-18 2017-10-17 Materion Corporation Methods for making bulk metallic glasses containing metalloids
RU2562598C2 (ru) * 2014-01-09 2015-09-10 Акционерное общество "Информационные спутниковые системы" имени академика М.Ф. Решетнева" Способ закалки стальных деталей
DE102019135295A1 (de) * 2019-12-19 2021-06-24 Benteler Automobiltechnik Gmbh Verfahren zur Herstellung einer Beschichtung auf Profilbauteilen aus Stahlblech
CN116571831A (zh) * 2023-07-11 2023-08-11 成都国营锦江机器厂 一种发动机燃油总管焊接工装、系统及焊接方法

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Publication number Publication date
JP2003003211A (ja) 2003-01-08
DE60207933T2 (de) 2006-09-14
EP1270749B1 (de) 2005-12-14
EP1270749A1 (de) 2003-01-02
DE60207933D1 (de) 2006-01-19

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AS Assignment

Owner name: KANTO YAKIN KOGYO K.K., JAPAN

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:TAKAHASHI, SUSUMU;REEL/FRAME:012860/0910

Effective date: 20020314

STCB Information on status: application discontinuation

Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION