SE510931C2 - Direct-fired oven and ways to reheat steel materials - Google Patents

Direct-fired oven and ways to reheat steel materials

Info

Publication number
SE510931C2
SE510931C2 SE9801260A SE9801260A SE510931C2 SE 510931 C2 SE510931 C2 SE 510931C2 SE 9801260 A SE9801260 A SE 9801260A SE 9801260 A SE9801260 A SE 9801260A SE 510931 C2 SE510931 C2 SE 510931C2
Authority
SE
Sweden
Prior art keywords
zone
direct
oven
furnace
shielding gas
Prior art date
Application number
SE9801260A
Other languages
Swedish (sv)
Other versions
SE9801260L (en
SE9801260D0 (en
Inventor
Roland Niemi
Original Assignee
Roland Niemi
Niemi Goeran
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 Roland Niemi, Niemi Goeran filed Critical Roland Niemi
Priority to SE9801260A priority Critical patent/SE510931C2/en
Publication of SE9801260D0 publication Critical patent/SE9801260D0/en
Priority to PCT/SE1999/000557 priority patent/WO1999051786A1/en
Priority to AU38572/99A priority patent/AU3857299A/en
Publication of SE9801260L publication Critical patent/SE9801260L/en
Publication of SE510931C2 publication Critical patent/SE510931C2/en

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
    • C21D9/0081—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for slabs; for billets
    • 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
    • F27B9/02—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity of multiple-track type; of multiple-chamber type; Combinations of furnaces
    • F27B9/028—Multi-chamber type furnaces
    • 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
    • F27D1/00—Casings; Linings; Walls; Roofs
    • F27D1/18—Door frames; Doors, lids, removable covers
    • F27D1/1858—Doors
    • 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
    • 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
    • F27B9/06—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity heated without contact between combustion gases and charge; electrically heated
    • F27B9/068—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity heated without contact between combustion gases and charge; electrically heated heated by radiant tubes, the tube being heated by a hot medium, e.g. hot 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
    • F27B9/20—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
    • F27B9/201—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 walking beam furnace
    • 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
    • F27D1/00—Casings; Linings; Walls; Roofs
    • F27D1/18—Door frames; Doors, lids, removable covers
    • F27D1/1858—Doors
    • F27D2001/1875—Hanging doors and walls

Abstract

Protective gas for a separate end region of the oven used to equalise steel material temperature is pre-heated by passing it through the direct heating zones. DETAILED DESCRIPTION - A directly-heated reheating oven for steel material (20, 21) prior to hot-rolling contains an end region (14) separated from the direct heating zone (12, 13). Protective gas is transported through pipes (23) that run through the direct heating zone and into the end zone so that the gas is pre-heated before reaching the end zone. An INDEPENDENT CLAIM is also included for the steel material reheating method using this oven.

Description

510 931 2. slutzonen 14 visas emellertid elektriska strålningsvärmare 22 för slutuppvärrnning av ämnena. 510 931 2. the end zone 14, however, electric radiant heaters 22 are shown for final heating of the substances.

Utmed ugnens sidoväggar löper rör 23,24 som mynnar i slutzonen 14 och sträcker sig genom direkteldningszonema 12 och 13. Under svängluckan 17 är rören 23,24 inmurade i tätningar 25, mot vilka svängluckan 17 tätar.Along the side walls of the furnace run pipes 23,24 which open into the end zone 14 and extend through the direct firing zones 12 and 13. Under the swing hatch 17 the tubes 23,24 are walled in seals 25, against which the swing hatch 17 seals.

Genom rören 23,24 tillförs en skyddsgas till slutzonen 14 och eftersom rören löper genom direkteldningszonema 12,13 kommer skyddsgasen att vara varm när den når slutzonen 14. Skyddsgasen kan lämpligen bestå av kväve. Det kan vara fördelaktigt att en mindre mängd väte eller annan brännbar gas är tillsatt till skyddsgasen så att det syre som finns i slutzonen förbränns.Through the pipes 23,24 a shielding gas is supplied to the end zone 14 and since the pipes run through the direct firing zones 12,13 the shielding gas will be hot when it reaches the end zone 14. The shielding gas may suitably consist of nitrogen. It may be advantageous for a small amount of hydrogen or other combustible gas to be added to the shielding gas so that the oxygen present in the final zone is burned.

Figur 3 visar samma ugn som Figurema 1 och 2, men de elektriska strålningsvärrnarna 22 har bytts ut mot ett eller flera strålningsrör 30 som sträcker sig från ugnens utsida och genom hela slutzonen 14 och mynnari direkteldningszonen 13. En ej visad brännare monteras på varje rör 30 på ugnens utsida och förbränningen och bränngasema leds genom rören och in i direkteldningszonen 13.Figure 3 shows the same furnace as Figures 1 and 2, but the electric radiation shields 22 have been replaced with one or two radiation tubes 30 extending from the outside of the furnace and through the entire end zone 14 and the mouth of the direct firing zone 13. A burner (not shown) is mounted on each tube 30. on the outside of the furnace and the combustion and combustion gases are led through the pipes and into the direct firing zone 13.

Det är vanligt att stålämnena är mer än 20 cm tjocka och ungefär 1 m breda och i slutzonen 14 ska vanligen inte yttemperaturen ökas utan i den zonen ska i huvudsak en temperaturutjämning ske i ämnena. Strålningsvärmama 22,30 är därför huvudsakligen till för att inte yttemperaturen ska sjunka under temperaturutjämningen. Genom att man har låg syrehalt i skyddszonen kommer glödskalsbildningen att minska avsevärt och vinsten av den minskade glödskalsbildningen överstiger överraskande med stor marginal extrakostnaden för tillverkning enligt uppfinningen;särskilt gäller detta en del legerade stål, exempelvis snabbstål.Det har visat sig att glödskalsbildningen kan minskas till hälften när uppfinningen tillämpas som beskrivits.It is common for the steel blanks to be more than 20 cm thick and approximately 1 m wide, and in the final zone 14 the surface temperature should not normally be increased, but in that zone a temperature equalization should mainly take place in the blanks. The radiant heaters 22.30 are therefore mainly for preventing the surface temperature from falling during the temperature equalization. Due to the low oxygen content in the protection zone, the scaling will decrease significantly and the benefit of the reduced scaling surprisingly exceeds by a large margin the extra cost of manufacturing according to the invention, especially some alloy steels, such as high speed steel. half when the invention is applied as described.

Claims (10)

5 i 510 931 Patentkrav5 and 510,931 Claims 1. Direkteldad återuppvärrnningsugn för värrnning av stålämnen (20,2l) före varmvalsningkännetecknad av en slutzon (14) avskild från direkteldningszonen (l2,l 3) och gasledningar (23,24) för skyddsgas som leder genom direkteldningszonen och mynnar i slutzonen så att skyddsgasen är förvärmd när den »släpps ut i slutzonen.Direct-fired re-heating furnace for the protection of steels (20,2l) before hot-rolling characterized by an end zone (14) separated from the direct-fire zone (l2, l3) and shielding gas lines (23,24) leading through the direct-fire zone and opening into the end zone is preheated when it is »released in the final zone. 2. Ugn enligt patentkrav l, kännetecknad av en upphettningsanordning (2230) i slutzonen för slutvärrnning av stålämnena.Furnace according to Claim 1, characterized by a heating device (2230) in the final zone for final protection of the steel blanks. 3. Ugn enligt patentkrav 2, kännetecknad av att upphettningsanordningen utgörs av strålningsvärmare (22,30).Furnace according to Claim 2, characterized in that the heating device consists of a radiant heater (22, 30). 4. Ugn enligt något av föregående patentkrav, varvid ugnen utgöres av en stegbalksugn; kännetecknad av att gasledningama (2324) löper utmed sidorna på ugnen.An oven according to any one of the preceding claims, wherein the oven is a step beam oven; characterized in that the gas lines (2324) run along the sides of the furnace. 5. Sätt att återuppvärma stålämnen (20,2l )i en direkteldad ugn före varmvalsning, kânnetecknad av att man avskiljer en slutzon (14) från direkteldningszonen (1 2,13) och förvärrner skyddsgas genom att leda den i ledningar (23,24) genom direkteldningszonen för att sedan släppa ut den förvärmda skyddsgasen i slutzonen.5. Method of reheating steel blanks (20,2l) in a direct-fired furnace before hot rolling, characterized by separating an end zone (14) from the direct-firing zone (1 2,13) and degrading shielding gas by passing it in pipes (23,24) through the direct firing zone and then release the preheated shielding gas into the final zone. 6. Sätt enligt patentkrav 5, kännetecknat av att man slutvärmer stålämnena (20,2l) i slutzonen (14).Method according to Claim 5, characterized in that the steel blanks (20,2l) are finally heated in the end zone (14). 7. Sätt enligt patentkrav 6, kännetecknat av att man strålningsvärmer stålärnnena (20,2l) i slutzonen (14).Method according to Claim 6, characterized in that the steel gutters (20,2l) are radially heated in the end zone (14). 8. Sätt enligt något av patentkraven 5-7, kännetecknat av att man använder kväve som skyddsgas.Method according to one of Claims 5 to 7, characterized in that nitrogen is used as shielding gas. 9. Sätt enligt något av patentkraven 5-8, kännetecknat av att man i skyddsgasen har en liten tillsats av en brännbar gas. 510 931 4Method according to one of Claims 5 to 8, characterized in that a small addition of a combustible gas is present in the shielding gas. 510 931 4 10. Sätt enligt patentkrav 9, kännetecknat av att man använder väte som den brännbara gasen.A method according to claim 9, characterized in that hydrogen is used as the combustible gas.
SE9801260A 1998-04-07 1998-04-07 Direct-fired oven and ways to reheat steel materials SE510931C2 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
SE9801260A SE510931C2 (en) 1998-04-07 1998-04-07 Direct-fired oven and ways to reheat steel materials
PCT/SE1999/000557 WO1999051786A1 (en) 1998-04-07 1999-04-06 A direct-heated furnace and a method of reheating steel semis
AU38572/99A AU3857299A (en) 1998-04-07 1999-04-06 A direct-heated furnace and a method of reheating steel semis

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE9801260A SE510931C2 (en) 1998-04-07 1998-04-07 Direct-fired oven and ways to reheat steel materials

Publications (3)

Publication Number Publication Date
SE9801260D0 SE9801260D0 (en) 1998-04-07
SE9801260L SE9801260L (en) 1999-07-12
SE510931C2 true SE510931C2 (en) 1999-07-12

Family

ID=20410921

Family Applications (1)

Application Number Title Priority Date Filing Date
SE9801260A SE510931C2 (en) 1998-04-07 1998-04-07 Direct-fired oven and ways to reheat steel materials

Country Status (3)

Country Link
AU (1) AU3857299A (en)
SE (1) SE510931C2 (en)
WO (1) WO1999051786A1 (en)

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1808152A (en) * 1925-08-06 1931-06-02 Thaddeus F Baily Continuous annealing apparatus
FR1561203A (en) * 1967-12-20 1969-03-28
JPS57192215A (en) * 1981-05-21 1982-11-26 Ishikawajima Harima Heavy Ind Co Ltd Metal-heating oven
JPS6127485A (en) * 1984-07-17 1986-02-06 中外炉工業株式会社 Continuous type atmosphere heat treatment furnace
JPS6173819A (en) * 1984-09-17 1986-04-16 Ito Seitetsushiyo:Kk Soaking treatment device for cold billet and hot billet

Also Published As

Publication number Publication date
SE9801260L (en) 1999-07-12
AU3857299A (en) 1999-10-25
SE9801260D0 (en) 1998-04-07
WO1999051786A1 (en) 1999-10-14

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