CA1069416A - Method and equipment for heat treatment of large tubes - Google Patents
Method and equipment for heat treatment of large tubesInfo
- Publication number
- CA1069416A CA1069416A CA250,909A CA250909A CA1069416A CA 1069416 A CA1069416 A CA 1069416A CA 250909 A CA250909 A CA 250909A CA 1069416 A CA1069416 A CA 1069416A
- Authority
- CA
- Canada
- Prior art keywords
- tube
- heating
- tubes
- temperature
- heat treating
- 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.)
- Expired
Links
Classifications
-
- 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
-
- 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
-
- 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
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)
- Heat Treatment Of Articles (AREA)
Abstract
A B S T R A C T
Method and apparatus for heat treating large thick-walled tubes in which the tubes are heated in two stages respectively involving flame and induction heating to austenitic conversion temperature, the stock being subsequently quenched.
Method and apparatus for heat treating large thick-walled tubes in which the tubes are heated in two stages respectively involving flame and induction heating to austenitic conversion temperature, the stock being subsequently quenched.
Description
This invention concer~.s a method of and apparatus or installation for heat treating lar~e tubes 9 and more specificall~ thick walled tubes.
It is common practice i~ the heat treatment or tempering of tube~, and particularly o~ large tubes 9 to heat the stock to austQnitic conversion temperature and ~uench by applying a quenching medium to the inner and outer surfaces of the tubes. Heat is applied either inductiYely or b~ ~eans of gas burners. These conventional methods are rather complicated and expensive and frequently it is not possible to control the commencement of cooling. :
It is an object of this in~entîon to provide a method of and apparatus or installation for heat treating or :;
tempering laree tubes which allow~ controlled treatment to be applied particularly to thick-walLed tubes i~ a simple and .
economic manner.
According to the in~ention, a method ~f heat-treati.ng tubes and particularly thick-walled tubes, comprises heating the itubes in two separate stages to austenitic conversion temperature, the first stage:involving flame heating at high e~ergy density up to approximately Curie Temperature~level and the second stage involving inductive heating to austenitic.
conversion temperature at low fre~uency for a duration which corre~pond~ at least to the ~ime requlre~ for temperature equali3ation and temperabure increase, the stoc~ then being ~ uenched.
From another aspect of the invention apparatus for carrying out the aforesaid method comprises transporting means for the tube, an annular burner device arranged forwardly of said air pipe which closely and concentrically surrou~ds the tube to be heated and comprises burner noz~les pointing in the direction towards the air pipe an inductive heatsr device arranged in succe~sion with the annular burner ~nd immediat~l~ succeeded by an exterior ring spra~.
. ~ .
The advantage~ of the method of this in~ention re~ide in the combination of the economically favourable flame-heating method with an even and uniform temperature equalisation process, particularl~ for thick-walled stock, obtained inductively at low frequency with the resulting pre~ention of temperature differential~ across the thickness of the tube walls during heat treatment.
~' , .' ' ' " ~';
~ he accompanying drawing dlagrammatically illustrates one embodiment of the apparatus of the in~entionO
In this apparatus the tuhes 1 are conYeyed in close successlon with ths aid o~ conventional transporting devices through an air pipe 2 and initially heated to approximately Curie temperature by flame heating with the aid of an a~nular burner 3 ~hereof the burner jsts po~nt in the dir~ction towasd~
the air pipe 2 to produce an opposi*e draft or countsrflow flame heating process. The ~nnular burner 3 is succeeded ~ :
-by an inductive heater d~ice 4 which in its tu~n s ~mmedlately - followed by an ann~lar spray device or spr~y ring 5~ If .~
~ ' ~ ~ L_ -required, a further ~pray ring may be additi onally provided in the interior of the tube .
.
:
', '~
'"`.
It is common practice i~ the heat treatment or tempering of tube~, and particularly o~ large tubes 9 to heat the stock to austQnitic conversion temperature and ~uench by applying a quenching medium to the inner and outer surfaces of the tubes. Heat is applied either inductiYely or b~ ~eans of gas burners. These conventional methods are rather complicated and expensive and frequently it is not possible to control the commencement of cooling. :
It is an object of this in~entîon to provide a method of and apparatus or installation for heat treating or :;
tempering laree tubes which allow~ controlled treatment to be applied particularly to thick-walLed tubes i~ a simple and .
economic manner.
According to the in~ention, a method ~f heat-treati.ng tubes and particularly thick-walled tubes, comprises heating the itubes in two separate stages to austenitic conversion temperature, the first stage:involving flame heating at high e~ergy density up to approximately Curie Temperature~level and the second stage involving inductive heating to austenitic.
conversion temperature at low fre~uency for a duration which corre~pond~ at least to the ~ime requlre~ for temperature equali3ation and temperabure increase, the stoc~ then being ~ uenched.
From another aspect of the invention apparatus for carrying out the aforesaid method comprises transporting means for the tube, an annular burner device arranged forwardly of said air pipe which closely and concentrically surrou~ds the tube to be heated and comprises burner noz~les pointing in the direction towards the air pipe an inductive heatsr device arranged in succe~sion with the annular burner ~nd immediat~l~ succeeded by an exterior ring spra~.
. ~ .
The advantage~ of the method of this in~ention re~ide in the combination of the economically favourable flame-heating method with an even and uniform temperature equalisation process, particularl~ for thick-walled stock, obtained inductively at low frequency with the resulting pre~ention of temperature differential~ across the thickness of the tube walls during heat treatment.
~' , .' ' ' " ~';
~ he accompanying drawing dlagrammatically illustrates one embodiment of the apparatus of the in~entionO
In this apparatus the tuhes 1 are conYeyed in close successlon with ths aid o~ conventional transporting devices through an air pipe 2 and initially heated to approximately Curie temperature by flame heating with the aid of an a~nular burner 3 ~hereof the burner jsts po~nt in the dir~ction towasd~
the air pipe 2 to produce an opposi*e draft or countsrflow flame heating process. The ~nnular burner 3 is succeeded ~ :
-by an inductive heater d~ice 4 which in its tu~n s ~mmedlately - followed by an ann~lar spray device or spr~y ring 5~ If .~
~ ' ~ ~ L_ -required, a further ~pray ring may be additi onally provided in the interior of the tube .
.
:
', '~
'"`.
Claims (3)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. A method of heat treating large tubes, comprising heating the tubes in two separate stages to austenitic conversion temperature, the first stage involving flame heating at high energy density up to approximately Curie Temperature level and the second stage involving inductive heating to austenitic conversion temperature at low frequency for a duration which corresponds at least to the time required for temperature equalisation and temperature increase, the stock then being quenched.
2. A method of heat treating large tubes according to Claim 1, wherein the flame-heating process is applied by the opposite draft or counterflow method with the tube set in rotation.
3. Apparatus for performing the method according to Claim 1 or Claim 2, wherein an air exhaust or outlet pipe is provided concentric with the tube being treated and comprising transporting means for the tube, an annular burner device arranged forwardly of said air pipe which closely and concentri-cally surrounds the tube to be heated and comprises burner nozzles pointing in the direction towards the air pipe an inductive heater device arranged in succession with the annular burner and immediately succeeded by an exterior ring spray.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19752529518 DE2529518B1 (en) | 1975-06-30 | 1975-06-30 | METHOD AND DEVICE FOR LARGE PIPE QUARING |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1069416A true CA1069416A (en) | 1980-01-08 |
Family
ID=5950504
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA250,909A Expired CA1069416A (en) | 1975-06-30 | 1976-04-23 | Method and equipment for heat treatment of large tubes |
Country Status (6)
| Country | Link |
|---|---|
| JP (1) | JPS526322A (en) |
| CA (1) | CA1069416A (en) |
| DE (1) | DE2529518B1 (en) |
| FR (1) | FR2316339A1 (en) |
| GB (1) | GB1541093A (en) |
| IT (1) | IT1059742B (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2714791A1 (en) * | 1977-04-02 | 1978-10-05 | Aeg Elotherm Gmbh | PROCESS FOR CONTINUOUS HEATING OF A LONG METAL WORKPIECE, IN PARTICULAR FOR CONTINUOUS HEATING OF STEEL PIPES |
| JPS57192991U (en) * | 1981-05-30 | 1982-12-07 | ||
| DE3140936A1 (en) * | 1981-10-15 | 1983-05-05 | Esser Werke GmbH vorm. Westmontan-Werke, 4788 Warstein | Process and device for hardening the inside of a two-ply steel pipe |
| JPH0512274Y2 (en) * | 1986-11-07 | 1993-03-29 | ||
| CN100335662C (en) * | 2005-01-28 | 2007-09-05 | 三一重工股份有限公司 | Production of concrete transporting pipes and special quenching apparatus thereof |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2349913B1 (en) * | 1973-10-02 | 1975-04-10 | Mannesmann Roehren Werke Ag | Device and method for quench hardening of pipes |
| FR2284847A1 (en) * | 1974-09-11 | 1976-04-09 | Siderurgie Fse Inst Rech | Steelworks reheating furnaces for slabs - using both blast furnace gas and induction heating to reduce consumption of fuel |
-
1975
- 1975-06-30 DE DE19752529518 patent/DE2529518B1/en not_active Ceased
-
1976
- 1976-04-06 GB GB13812/76A patent/GB1541093A/en not_active Expired
- 1976-04-09 IT IT22136/76A patent/IT1059742B/en active
- 1976-04-19 JP JP51044337A patent/JPS526322A/en active Pending
- 1976-04-23 CA CA250,909A patent/CA1069416A/en not_active Expired
- 1976-06-02 FR FR7616618A patent/FR2316339A1/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| DE2529518B1 (en) | 1976-08-26 |
| JPS526322A (en) | 1977-01-18 |
| FR2316339B1 (en) | 1979-01-19 |
| GB1541093A (en) | 1979-02-21 |
| DE2529518A1 (en) | 1976-08-26 |
| FR2316339A1 (en) | 1977-01-28 |
| IT1059742B (en) | 1982-06-21 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |