CN101440427A - Steel pipe normalizing method - Google Patents
Steel pipe normalizing method Download PDFInfo
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- CN101440427A CN101440427A CNA2008101479164A CN200810147916A CN101440427A CN 101440427 A CN101440427 A CN 101440427A CN A2008101479164 A CNA2008101479164 A CN A2008101479164A CN 200810147916 A CN200810147916 A CN 200810147916A CN 101440427 A CN101440427 A CN 101440427A
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Abstract
The invention relates to a method for normalizing steel pipes, and solves the problems of difficult control for flame atmosphere in a furnace and serious oxidization of steel pipes in the prior normalizing method. The method is carried out in a fume protective furnace, and a furnace body of the fume protective furnace is provided with a preheating section (1), a heating section (II), a soaking section (III), a transition section (IV) and a cooling section (V) in turn. A furnace front door and a furnace back door of the furnace body are provided with a fan cover and a curtain for isolating the furnace and the atmosphere, the transition section (IV) is provided with a curtain for isolating the soaking section and the cooling section, roller ways (5) for conveying the steel pipes are arranged in the furnace body, the furnace walls of the heating section and the soaking section above and under the roller ways are provided with burning nozzles, a flame barrier (3) separates flames of the heating section and the soaking section, the heating section heats the steel pipes to between 930 and 1,020 DEG C, the heating time is 7 to 35 minutes, the roller ways convey the heated steel pipes to a heat insulation section, the heat insulation time is 10 to 51 minutes, then the roller ways convey the insulated steel pipes to the cooling section for cooling, and the steel pipes are taken out of the furnace when cooled to a temperature of between 270 and 350 DEG C.
Description
Technical field:
The present invention is relevant with normalizing process in the steel pipe stove.
Background technology:
At present domestic steel pipe normalizing commonly used is to carry out in untight environment, and the high temperature air cooling mode of coming out of the stove is adopted in the steel pipe cooling.Environmental pollution is serious, the energy consumption height, and waste is serious.Fire door opens wide during steel pipe normalizing, and furnace atmosphere is influenced by outside air, the bad control of furnace flame temperature, and steel pipe tapping temperature higher (〉=800 ℃).Surface oxidation behind the steel pipe normalizing is inhomogeneous, and zone of oxidation is thicker, and the steel tube performance instability can not satisfy more hi-tech requirement.
Summary of the invention:
The purpose of this invention is to provide a kind of save energy, environmental pollution is few, and product performance are stable, and quality is good, the thin and uniform steel pipe normalizing method of product surface zone of oxidation.
The present invention is achieved in that
Steel pipe normalizing technology of the present invention; in flue gas protection stove, carry out; the body of heater of flue gas protection stove has preheating section I successively; heating zone II; soaking zone III; transition section IV; cooling section V; the stokehold door of body of heater; there are fan housing and isolated body of heater of curtain and atmosphere in the stove back door; transition section IV has isolated soaking zone of curtain and cooling section; roller-way 5 conveying steel pipes are arranged in the body of heater; on the roller-way of heating zone and soaking zone; following furnace wall has to burn chews by Sweet natural gas and air mixed burning generation heat; there is firebreak 3 to separate the flame of heating zone and soaking zone; reducing each section heat transmits mutually; heating zone is heated to 930 ℃-1020 ℃ with steel pipe; be 7-35 minutes heat-up time; steel pipe after roller-way will heat is delivered to holding-zone; 930 ℃-1020 ℃ of holding temperatures; soaking time is 10-51 minutes; steel pipe after roller-way will be incubated is delivered to cooling section body is cooled off; be cooled to come out of the stove after 270-350 ℃ of the temperature, heat-eliminating medium is a cooling section body of heater furnace roof; cooled flue gas and furnace roof that furnace bottom flue gas mouth sprays into; furnace bottom; the water coolant of furnace wall, stove both sides water tank internal recycle, the steel pipe heating; insulation and cooling all are to carry out in check atmosphere.
On the body of heater of preheating section (I) exhaust smoke outlet is arranged, produce waste gas by combustion of natural gas in the stove and enter preheating section to steel pipe preheating 10-30 minutes, preheating temperature is 650-750 ℃, and the preheating flue gas is discharged by exhaust smoke outlet.
Recirculated water in furnace roof, furnace bottom, furnace wall, the stove both sides water tank is from the pond, and the water coolant of recovery is constantly injected by water cooling tower in the pond, and the cooled flue gas that exhaust smoke outlet sprays into reclaims the flue gas that refrigerating unit is exported from flue gas in chimney.
The present invention adds fan housing and isolated curtain section at burner stove tail, and cooling section adopt to reclaim the flue gas spray and the recirculated water that have been cooled and cools off.After in steel pipe enters stove, earlier through high-temp waste gas preheating, save energy.The normalizing whole process of steel pipe is in the stove of a complete closed carries out, and outside air is difficult to enter in the stove, and furnace flame temperature and atmosphere are controlled easily.Flue gas after the heating is discharged from chimney through smoke outlet, reduces environmental pollution.Steel pipe reclaims chilled flue gas spray and recirculated water cooling section through adopting from chimney before coming out of the stove, steel pipe is difficult for oxidation at cooling section, the steel pipe temperature is reduced to hang down to being difficult for just come out of the stove after the oxidized temperature.Heat-eliminating medium was for the present invention produced and the waste gas and the waste water of recycle, further reduced energy consumption and to the pollution of environment.Adopt method of the present invention, steel tube surface zone of oxidation after the normalizing very thin (≤0.10mm) and the well-proportioned purpose of oxidation, because heating zone, soaking zone is hedged off from the outer world and is separated by firebreak each other, reducing heat transmits between each section mutually, flame atmosphere is easy to control in each section, can guarantee that the steel tube performance that the accurate realization of Heating temperature and holding temperature handles the present invention is better and stable.
Description of drawings:
Fig. 1 faces diagrammatic cross-section for flue gas protection furnace structure of the present invention.
Embodiment:
The body of heater front end of the flue gas protection stove that the inventive method is used has burner fan housing 1; there is stove tail fan housing 10 rear end; the inlet of burner fan housing and stove tail fan housing is communicated with flue; flow out the flue gas of stove gate before and after taking away in the stove; there is firebreak 3 that the body of heater fore portion is divided into preheating section I in the body of heater; heating zone II and soaking zone III; the body of heater rear portion is divided into cooling section V; between cooling section and the soaking zone transition section IV; transition section has isolated curtain 6; preheating section has exhaust smoke outlet 12 to link to each other with chimney; isolated curtain 2 before having between exhaust smoke outlet and the stokehold door; roller-way 5 is arranged in the body of heater; on the roller-way of heating zone and soaking zone; under be evenly equipped with to burn and chew 4 and (arrange the number differences for two sections; heating zone is arranged much closeer than soaking zone); at cooling section furnace roof cooling water tank 8 is arranged; furnace bottom cooling water tank 11 and stove two side cooling water tank (not shown); on the roller-way 5 of cooling section front end; following furnace wall cooled flue gas pipeline 7; furnace roof in the cooling section rear end has exhaust smoke outlet 12, has the stove tail to completely cut off curtain 9 between exhaust smoke outlet 12 and the stove back door.
The heat treatment process parameter of the steel pipe of various materials in flue gas protection stove is as follows:
1、12CrlMoVG
Temperature is selected: 980 ℃～1020 ℃ (the temperature difference that different cold working modes are selected),
Heat-up time: 7～18 minutes (different cold working mode difference heat-up time),
Soaking time: 10～25 minutes (different cold working mode soaking time difference).
2、15CrMoG
Temperature is selected: 930 ℃～950 ℃ (the temperature difference that different cold working modes are selected),
Heat-up time: 7～18 minutes (different size difference heat-up time),
Soaking time: 10～25 minutes (different size soaking time difference).
3、T91
Temperature is selected: 1020 ℃～1050 ℃,
Heat-up time: 11～38 minutes (different size difference heat-up time),
Soaking time: 14～45 minutes (different size soaking time difference).
4、T11、T12、P11、P12
Temperature is selected: 930 ℃～950 ℃ (the temperature difference that different cold working modes are selected),
Heat-up time: 13～35 minutes (different size difference heat-up time),
Soaking time: 16～51 minutes (different size soaking time difference).
5, the tapping temperature of above-mentioned material is 270-350 ℃.
Contrast on effect with the common process processing:
It is better and stable to process rear steel tube performance than common process after adopting this PROCESS FOR TREATMENT to process, table The face oxide layer thin many (≤0.10mm) and evenly, the atmosphere of each section is subjected to strict control, steel in the stove The function admirable of pipe, steady quality.
The preheating flue gas that flue gas protecting furnace is used, cooled flue gas and cooling water are all released from the present invention Waste gas, the waste water putting and after cooling, recycle.
Claims (3)
1; steel pipe normalizing method; it is characterized in that in flue gas protection stove, carrying out; the body of heater of flue gas protection stove has preheating section (I) successively; heating zone (II); soaking zone (III); transition section (IV) cooling section (V); there are fan housing and isolated body of heater of curtain and atmosphere in the stokehold door of body of heater and stove back door; transition section (IV) is by isolated soaking zone of curtain and cooling section; roller-way (5) conveying steel pipe is arranged in the body of heater; on the roller-way of heating zone and soaking zone; following furnace wall has to burn chews by Sweet natural gas and air mixed burning generation heat; there is firebreak (3) to separate the flame of heating zone and soaking zone; reducing each section heat transmits mutually; heating zone is heated to 930 ℃-1020 ℃ with steel pipe; be 7-35 minutes heat-up time; steel pipe after roller-way will heat is delivered to holding-zone; 930 ℃-1020 ℃ of holding temperatures; soaking time is 10-51 minutes; steel pipe after roller-way will be incubated is delivered to cooling section body is cooled off; be cooled to come out of the stove after 270-350 ℃ of the temperature; heat-eliminating medium is the furnace roof of cooling section body of heater; cooled flue gas and furnace roof that furnace bottom flue gas mouth sprays into; furnace bottom; the water coolant of furnace wall, stove both sides water tank internal recycle, the steel pipe heating; insulation and cooling all are to carry out in check atmosphere.
2, method according to claim 1, it is characterized in that on the body of heater of preheating section (I) exhaust smoke outlet being arranged, produce waste gas by combustion of natural gas in the stove and enter preheating section to steel pipe preheating 10-30 minutes, preheating temperature is 650-750 ℃, and the preheating flue gas is discharged by smoke outlet.
3, method according to claim 1, it is characterized in that furnace roof, furnace bottom, recirculated water in the water tank of furnace wall, stove both sides is from the pond, the water in pond is delivered to water cooling tower through water pump, the water coolant of recovery is constantly injected by water cooling tower in the pond, and the cooled flue gas that exhaust smoke outlet sprays into reclaims the flue gas that cooling is exported from flue gas cooling device in chimney.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008101479164A CN101440427B (en) | 2008-12-19 | 2008-12-19 | Steel pipe normalizing method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008101479164A CN101440427B (en) | 2008-12-19 | 2008-12-19 | Steel pipe normalizing method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101440427A true CN101440427A (en) | 2009-05-27 |
| CN101440427B CN101440427B (en) | 2011-04-06 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2008101479164A Expired - Fee Related CN101440427B (en) | 2008-12-19 | 2008-12-19 | Steel pipe normalizing method |
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| CN (1) | CN101440427B (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102313455A (en) * | 2011-09-21 | 2012-01-11 | 广东中窑窑业股份有限公司 | Device for utilizing residual heat of ceramic roller kiln |
| CN102399964A (en) * | 2011-11-29 | 2012-04-04 | 常熟市无缝钢管有限公司 | Steel pipe normalizing furnace |
| CN108155122A (en) * | 2017-12-22 | 2018-06-12 | 合肥费舍罗热工装备有限公司 | A kind of diode chain encapsulates stove |
| CN108842049A (en) * | 2018-08-11 | 2018-11-20 | 江阴市鸣管业有限公司 | A kind of device and method for the high plastic steel pipe of internal high pressure forming |
| CN109929972A (en) * | 2019-04-02 | 2019-06-25 | 浙江明贺钢管有限公司 | A kind of steel pipe non-oxidation normalizing process and device |
| CN114798801A (en) * | 2021-08-25 | 2022-07-29 | 常熟市异型钢管有限公司 | Automatic production method of high-precision oxygen-free steel pipe |
-
2008
- 2008-12-19 CN CN2008101479164A patent/CN101440427B/en not_active Expired - Fee Related
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102313455A (en) * | 2011-09-21 | 2012-01-11 | 广东中窑窑业股份有限公司 | Device for utilizing residual heat of ceramic roller kiln |
| CN102399964A (en) * | 2011-11-29 | 2012-04-04 | 常熟市无缝钢管有限公司 | Steel pipe normalizing furnace |
| CN102399964B (en) * | 2011-11-29 | 2012-10-10 | 常熟市无缝钢管有限公司 | Steel pipe normalizing furnace |
| CN108155122A (en) * | 2017-12-22 | 2018-06-12 | 合肥费舍罗热工装备有限公司 | A kind of diode chain encapsulates stove |
| CN108155122B (en) * | 2017-12-22 | 2021-04-16 | 合肥费舍罗热工装备有限公司 | Diode chain type packaging furnace |
| CN108842049A (en) * | 2018-08-11 | 2018-11-20 | 江阴市鸣管业有限公司 | A kind of device and method for the high plastic steel pipe of internal high pressure forming |
| CN109929972A (en) * | 2019-04-02 | 2019-06-25 | 浙江明贺钢管有限公司 | A kind of steel pipe non-oxidation normalizing process and device |
| CN114798801A (en) * | 2021-08-25 | 2022-07-29 | 常熟市异型钢管有限公司 | Automatic production method of high-precision oxygen-free steel pipe |
Also Published As
| Publication number | Publication date |
|---|---|
| CN101440427B (en) | 2011-04-06 |
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| ASS | Succession or assignment of patent right |
Owner name: PANGANG GROUP CHENGDU STEEL + VANADIUM CO., LTD. Owner name: PANGANG GROUP STEEL VANADIUM + TITANIUM CO., LTD. Free format text: FORMER OWNER: PANGANG GROUP CHENGDU IRON + STEEL CO., LTD Effective date: 20101018 |
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Effective date of registration: 20101018 Address after: 610303, solidarity Road, Qingbaijiang District, Sichuan, Chengdu Applicant after: Pangang Group Steel Vanadium & Titanium Co., Ltd. Co-applicant after: Pangang Group Chengdu Steel & Vanadium Co., Ltd. Address before: 610303, solidarity Road, Qingbaijiang District, Sichuan, Chengdu Applicant before: Pangang Group Chengdu Iron & Steel Co., Ltd |
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Granted publication date: 20110406 Termination date: 20161219 |