WO1987003159A1 - Procede et appareil de refroidissement d'un materiau chauffe par induction - Google Patents

Procede et appareil de refroidissement d'un materiau chauffe par induction Download PDF

Info

Publication number
WO1987003159A1
WO1987003159A1 PCT/US1985/002228 US8502228W WO8703159A1 WO 1987003159 A1 WO1987003159 A1 WO 1987003159A1 US 8502228 W US8502228 W US 8502228W WO 8703159 A1 WO8703159 A1 WO 8703159A1
Authority
WO
WIPO (PCT)
Prior art keywords
reaction chamber
cooling
shroud
temperature
inert gas
Prior art date
Application number
PCT/US1985/002228
Other languages
English (en)
Inventor
Kevin S. Mcginn
Klaus A. Burckhardt
Werner Buecker
Original Assignee
Mg Industries, Inc.
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 to US06/629,362 priority Critical patent/US4581512A/en
Application filed by Mg Industries, Inc. filed Critical Mg Industries, Inc.
Priority to PCT/US1985/002228 priority patent/WO1987003159A1/fr
Priority to KR870700602A priority patent/KR880701060A/ko
Priority to JP60505256A priority patent/JPS63501370A/ja
Publication of WO1987003159A1 publication Critical patent/WO1987003159A1/fr

Links

Classifications

    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B6/00—Heating by electric, magnetic or electromagnetic fields
    • H05B6/02—Induction heating
    • 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
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/34—Methods of heating
    • C21D1/42—Induction heating
    • 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
    • C21D1/62—Quenching devices
    • 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
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/08—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for tubular bodies or pipes
    • C21D9/085—Cooling or quenching
    • 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
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/52—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length
    • C21D9/54—Furnaces for treating strips or wire
    • C21D9/56—Continuous furnaces for strip or wire
    • C21D9/60—Continuous furnaces for strip or wire with induction heating
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00—Technologies related to metal processing
    • Y02P10/25—Process efficiency

Definitions

  • This invention relates to the field of induction heating and, more particularly, it relates to a method and apparatus for the cooling of induction heated material.
  • a tube or billet material is passed through an induction coil and heated to a temperature above its critical reaction temperature and then introduced into a highly oxidizing atmosphere.
  • the material is Introduced to a highly oxidizing atmosphere of air and is passed through a water spray where it is cooled to a temperature in preparation for passage to a cut-off station.
  • the induction heated material is cooled in an oxidizing environment and upon completion of the induction heating process, the materials are cleaned by means of several processes, including acid cleaning (pickling), sand blasting, buffing and shot, and grinding, polishing, etc.
  • the objects of this invention are accomplished by providing a cooling shroud in accordance with the invention in a continuous induction heating process adjacent to the induction heater so that the material being processed passes directly from the induction heater through the cooling shroud.
  • a flow control system for introducing a blended atmosphere of hydrogen and an inert gas. to the shroud's internal reaction chamber. The process is controlled so that the hydrogen reacts with the induction heated material which enters the reaction chamber at a temperature above its lowest "reaction -temperature" whereby hydrogen reacts therewith to effect the reduction of surface oxides after which the material is cooled in a continuous inert atmosphere until the material is below its reaction temperature.
  • reaction temperature is defined as that temperature where the metal being processed reacts with hydrogen to reduce surface oxidation.
  • Figure 1 is a schematic view of an induction heating process illustrating the method of the invention.
  • FIG. 2 is a sectional view showing a cooling shroud in accordance with the invention. Detailed Description of .the Invention
  • FIG. 1 there is shown an induction heating process incorporating the novel shroud cooling system of the invention.
  • a flat stock feeder 10 wherein a coil of a material, such as stainless steel or other metallic materials to be processed, is mounted to be fed to a former 12.
  • the former 12 is typically provided with rounding dies which bend and form the flat stock into a desired shape, such as a round tube "T" as is the case in the present disclosure.
  • the tube is then fed to a welder 14 which bonds the formed tube together to provide a watertight joint. From the welder 14, the tube T is fed to an induction heating coil 16 which is conventional and has the tube T fed through the interior thereof in heat exchange relationship therewith.
  • the induction heating coil 16 operates to increase the temperature of the material to that required for the full annealing thereof.
  • the induction heating coil 16 is mounted in a non-conductive refractory casing 18 and is butted up against the novel cooling shroud unit 20 in accordance with the invention as is best shown in Figure 2.
  • the cooling shroud unit 20 is shown in detail in Figure 2 and comprises an elongated reaction tube 22 having cap 24 at the entrance end thereof butted up against the refractory casing 18 of the induction coil 16.
  • Reaction tube 22 is mounted as shown in Figure 2 to receive the tube T, which is fed therethrough in the direction shown by the arrow in this Figure.
  • reaction tube 22 has a reducer 26 made of stainless steel and is provided with refractory packing 28 for closing the tube 22.
  • the cap 24 at the entrance end of the reactor tube 22 is provided with an opening to permit the passage of the induction heated tube T into the interior of reactor tube 22, and the packing 28 at the exit end of the reaction tube 22 is provided with an opening to permit the passage of the tube T out of the interior of reaction tube 22.
  • reaction tube 22 The space defined within reaction tube 22, end cap 24 and reducer 26 serves as a reaction chamber 30 for the unit 20.
  • a cylindrical water jacket 32 is mounted around the exterior of the reaction tube 32 and is provided with an inlet 34 and an outlet 36 for circulating a flow of water for use in cooling the outer surface of reaction tube 22 to control the temperature of the tube T passing therethrough.
  • Means are provided for introducing hydrogen gas into the reaction chamber 30.
  • Such means comprises a ring manifold 40 having hydrogen gas supplied thereto through a supply line 42.
  • a plurality of flow passages 44 are formed in the reaction tube 22 in circumferentially spaced relation and are aligned with the ring manifold 40 for the delivery of hydrogen gas into reaction chamber 30 in a direction directed towards the entrance end of the reaction chamber 30. To this end, flow passages 44 extend at a 45° angle to the axis of reaction tube 22.
  • Such means comprises a ring manifold 50 extending around the reaction tube 22 near the exit end thereof and a line 52 for supplying nitrogen gas to the ring manifold 50.
  • flow passages 54 formed in the reaction tube 22 in circumferentially spaced relation and aligned with the ring manifold 50 and arranged to direct the nitrogen gas into the reaction chamber 30 in a direction toward the entrance end thereof. To this end, flow passages 54 extend at a 45° angle to the axis of reaction tube 22.
  • the end cap 24 is provided with a passage 25 to allow gas to be discharged from the entrance end of reaction chamber 30 for burn-off purposes.
  • a flow control means 46 is provided in hydrogen feed line 42 for controlling the flow of the hydrogen gas to the reaction chamber 30. Typically, the flow control means 46 delivers the hydrogen gas at 70° F and 30 PSIG.
  • a flow control means 56 is provided in nitrogen feed line 52 for controlling the flow of nitrogen gas to the reaction chamber 30. Typically, the control means 56 delivers the nitrogen gas at 70° F and 30 PSIG.
  • control means 46 and 56 operate to control the flow rates of hydrogen and nitrogen so that there are approximately five volume changes to the total volume of the reaction chamber 30 for each length of material treated.
  • the ratio of the gas mixture of hydrogen and nitrogen varies with the type of material being processed.
  • the flow of nitrogen is maintained at a volume to keep the outside air from entering the reaction chamber 30 of the cooling shroud.
  • the hydrogen gas is introduced at a forward location and is directed toward the entrance end of the reaction chamber 30 and the nitrogen is introduced at a location at the exit end of the reaction chamber 30 and is directed toward the entrance end thereof.
  • the cooling action of the water jacket 32 is controlled such as to maintain the temperature within the reaction chamber 30 at a level to cool down the tube T so that the temperature of the tube T when it leaves the reaction chamber 30 is below the "reaction temperature" for the material being treated.
  • a tube enters cooling shroud unit 20 at about 2100° F and leaves the shroud at approximately 100° F to 120° F.
  • the tube T passes to an automatic cut-off saw 60 which operates to cut the tube into desired lengths, such as 10 feet or 20 feet.
  • the method and apparatus of the invention has been used to eliminate surface oxidation of stainless steel tubes so as to provide a bright finish. Moreover, the actual use of the method of the invention has produced stainless steel tubes having a workable hardness of RB-62-64 whereas a comparable prior art method produced stainless steel tubes having a hardness of RB-72-78 which is harder and less workable.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Electromagnetism (AREA)
  • Heat Treatment Of Articles (AREA)
  • Physical Or Chemical Processes And Apparatus (AREA)

Abstract

Un procédé et appareil pour le chauffage par induction d'un matériau métallique (T) consiste à donner audit matériau (T) la forme désirée, à placer le matériau (T) ainsi formé dans une relation d'échange de chaleur avec un serpentin de chauffage par induction (16), à faire passer le matériau (T) ainsi chauffé du serpentin de chauffage par induction (16) directement dans la chambre de réaction (30) d'une enceinte de refroidissement (20) à une température supérieure à sa température de réaction la plus basse, à introduire du gaz d'hydrogène et un gaz inerte dans la chambre de réaction (30) de l'enceinte de refroidissement (20), afin d'exposer le matériau (T) entrant dans la chambre de réaction (30) à ce mélange de gaz, de façon à réduire l'oxydation de surface dudit matériau (T), à refroidir le matériau (T) dans la chambre de réaction (30) tout en exposant sa surface au gaz inerte, et à retirer ledit matériau (T) de l'enceinte de refroidissement (20) à une température réduite, inférieure à la température de réaction dudit matériau (T), ce qui permet d'éliminer la formation d'oxydes de surfaces lourdes et d'obtenir un matériau (T) d'une duretée maniable.
PCT/US1985/002228 1984-07-10 1985-11-12 Procede et appareil de refroidissement d'un materiau chauffe par induction WO1987003159A1 (fr)

Priority Applications (4)

Application Number Priority Date Filing Date Title
US06/629,362 US4581512A (en) 1984-07-10 1984-07-10 Method and apparatus for cooling induction heated material
PCT/US1985/002228 WO1987003159A1 (fr) 1985-11-12 1985-11-12 Procede et appareil de refroidissement d'un materiau chauffe par induction
KR870700602A KR880701060A (ko) 1985-11-12 1985-11-12 유도 가열된 물질의 냉각 장치 및 방법
JP60505256A JPS63501370A (ja) 1985-11-12 1985-11-12 誘導加熱された材料の冷却方法及び装置

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/US1985/002228 WO1987003159A1 (fr) 1985-11-12 1985-11-12 Procede et appareil de refroidissement d'un materiau chauffe par induction

Publications (1)

Publication Number Publication Date
WO1987003159A1 true WO1987003159A1 (fr) 1987-05-21

Family

ID=22188934

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US1985/002228 WO1987003159A1 (fr) 1984-07-10 1985-11-12 Procede et appareil de refroidissement d'un materiau chauffe par induction

Country Status (3)

Country Link
JP (1) JPS63501370A (fr)
KR (1) KR880701060A (fr)
WO (1) WO1987003159A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2632973A1 (fr) * 1988-06-21 1989-12-22 Michelin & Cie Procedes et dispositifs pour obtenir une structure d'austenite homogene
EP1233078A2 (fr) * 2001-02-20 2002-08-21 Linde Aktiengesellschaft Procédé de trempe de pièces métalliques

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1905809A (en) * 1931-05-02 1933-04-25 Surface Combustion Corp Method of preventing oxidation of metals during heat treatment
US1944743A (en) * 1930-06-26 1934-01-23 Gen Electric Method for annealing steel
US2240099A (en) * 1935-10-18 1941-04-29 Schincke Otto Method of bright annealing elongated metal bodies
US2452915A (en) * 1947-06-27 1948-11-02 Armco Steel Corp Nitriding process
US2666003A (en) * 1949-02-18 1954-01-12 Bethlehem Steel Corp Treating strip
US4154629A (en) * 1975-12-23 1979-05-15 Kabushiki-Kaisha Fujikoshi Process of case hardening martensitic stainless steels
US4163470A (en) * 1977-06-30 1979-08-07 The Babcock & Wilcox Company Industrial technique
US4449037A (en) * 1978-10-31 1984-05-15 Fujitsu Limited Method and apparatus for heating semiconductor wafers

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1944743A (en) * 1930-06-26 1934-01-23 Gen Electric Method for annealing steel
US1905809A (en) * 1931-05-02 1933-04-25 Surface Combustion Corp Method of preventing oxidation of metals during heat treatment
US2240099A (en) * 1935-10-18 1941-04-29 Schincke Otto Method of bright annealing elongated metal bodies
US2452915A (en) * 1947-06-27 1948-11-02 Armco Steel Corp Nitriding process
US2666003A (en) * 1949-02-18 1954-01-12 Bethlehem Steel Corp Treating strip
US4154629A (en) * 1975-12-23 1979-05-15 Kabushiki-Kaisha Fujikoshi Process of case hardening martensitic stainless steels
US4163470A (en) * 1977-06-30 1979-08-07 The Babcock & Wilcox Company Industrial technique
US4449037A (en) * 1978-10-31 1984-05-15 Fujitsu Limited Method and apparatus for heating semiconductor wafers

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2632973A1 (fr) * 1988-06-21 1989-12-22 Michelin & Cie Procedes et dispositifs pour obtenir une structure d'austenite homogene
EP0347699A1 (fr) * 1988-06-21 1989-12-27 COMPAGNIE GENERALE DES ETABLISSEMENTS MICHELIN-MICHELIN & CIE Procédés et dispositifs pour obtenir une structure d'austénite homogène
EP1233078A2 (fr) * 2001-02-20 2002-08-21 Linde Aktiengesellschaft Procédé de trempe de pièces métalliques
EP1233078A3 (fr) * 2001-02-20 2003-11-26 Linde Aktiengesellschaft Procédé de trempe de pièces métalliques

Also Published As

Publication number Publication date
JPS63501370A (ja) 1988-05-26
KR880701060A (ko) 1988-04-22

Similar Documents

Publication Publication Date Title
US4581512A (en) Method and apparatus for cooling induction heated material
KR100207836B1 (ko) 금속 코일 연속 제조 장치 및 금속 코일 제조 방법
US6018859A (en) Method of forming seamed metal tube
US5860204A (en) Continuous tube forming and coating
CN1050689A (zh) 工件通过液态涂覆物进行连续或间歇涂覆的方法、容器和装置
CN109097536B (zh) 一种不锈钢工件的氧化着色退火炉
US5447583A (en) Extrusion quenching apparatus and related method
WO1987003159A1 (fr) Procede et appareil de refroidissement d'un materiau chauffe par induction
US4552091A (en) Apparatus for metalizing metal bodies
JPH05294634A (ja) 酸化鉄粒子の製造方式及び製造装置
GB1072318A (en) Method of and apparatus for the hot forming of metal
US3561096A (en) Method of continuous tube forming and galvanizing
US3256592A (en) Continuous tube forming and galvanizing
US2674210A (en) External powder feed-hand scarfing apparatus
US3354864A (en) Apparatus for coating metallic strands
CN109055675B (zh) 一种不锈钢工件的氧化着色和退火工艺
US3546029A (en) Descaling copper rods
US4551354A (en) Method for metalizing metal bodies
RU2139251C1 (ru) Способ получения хромата щелочного металла
US4428563A (en) Apparatus for spot annealing tubing
JPH06170348A (ja) 銅管長尺コイルの管内残油除去方法
US4257472A (en) Continuous casting of hollow shapes
US3562025A (en) Descaling copper rods
CA1247992A (fr) Methodes et dispositif de desoxydation des chemises de rouleaux d'un laminoir de tuyaux
JP2003535302A (ja) 熱処理設備から得られる可燃物を処理するための装置及び方法並びにそれに用いられる設備

Legal Events

Date Code Title Description
AK Designated states

Kind code of ref document: A1

Designated state(s): AT JP KR

ENP Entry into the national phase

Ref country code: AT

Ref document number: 1985 9086

Date of ref document: 19870521

Kind code of ref document: A

Format of ref document f/p: F