CN101649378B - Method for low-temperature tempering heat treatment by using steel plate continuous heat-treating furnace - Google Patents
Method for low-temperature tempering heat treatment by using steel plate continuous heat-treating furnace Download PDFInfo
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- CN101649378B CN101649378B CN2009100639495A CN200910063949A CN101649378B CN 101649378 B CN101649378 B CN 101649378B CN 2009100639495 A CN2009100639495 A CN 2009100639495A CN 200910063949 A CN200910063949 A CN 200910063949A CN 101649378 B CN101649378 B CN 101649378B
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Abstract
The invention relates to a method for low-temperature tempering heat treatment of a steel plate. The method for low-temperature tempering heat treatment by using a steel plate continuous heat-treating furnace is characterized by comprising the following steps: (1) an air manifold of a combustion-supporting air supply duct system of the steel plate continuous heat-treating furnace is connected with a hot gas transport duct on which a first changeover valve is arranged, and the air manifold of the combustion-supporting air supply duct system is provided with a second changeover valve positioned between a combustion-supporting blower and the joint of the air manifold and the hot gas transport duct; (2) the steel plate is subject to the low-temperature tempering heat treatment, the second changeover valve is closed, the first changeover valve is opened, the hot gas transport duct supplies hot gas with adjustable temperature inside a furnace chamber to control the temperature inside the furnace chamber within the range from 180 DEG C to 350 DEG C through the combustion-supporting air supply duct system and a self-preheating burner heating system of the steel plate continuous heat-treating furnace, and the steel plate is heated by the low-temperature tempering heat treatment in the furnace chamber of the steel plate continuous heat-treating furnace. The method is simple and can be used for low-temperature tempering heat treatment.
Description
Technical field
The present invention relates to a kind of method of steel plate low-temperature tempering heat treatment.
Background technology
Steel plate thermal treatment is meant by several heat treatment process such as normalizing, quenching, annealing, tempering, changes the tissue of steel plate, obtains different mechanical propertys, satisfies different service requirementss.
At present, in large-scale steel plate heat treatment department,, after heating continuously, realizes the batch that the thermal treatment of steel plate all adopts the continuous heat treating furnace of carrying by roller-way to carry out steel plate for realizing continuous high yield.The normalizing of its light plate, quenching heat treatment process heat realization by adopting radiator tube heating, the controlled high temperature continuous heat treating furnace of oven cavity atmosphere; Tempering heat treatment to steel plate then is to handle on the stove continuously at other low temperature to realize, this low temperature continuous heat treating furnace adopts the self-preheating type fuel burner nozzle that burner hearth is carried out the naked light heat supply, and adopt sectional The pulse burning control technique, make the heat treatment furnace fire box temperature reach the thermal treatment of realization steel plate and heat desired target temperature value.Because steel plate carries out the Heating temperature of medium and high temperature tempering heat treatment generally at 350～730 ℃, corresponding fire box temperature requirement is controlled at 400～800 ℃, and this furnace temperature condition is to realize easily also satisfying the temperature uniformity requirement by carrying out the naked light heating from the preheated fuel gas burner and adopting The pulse burning control technique.And when some steel plates required to carry out low-temperaturetempering heating (150～250 ℃ of steel billet temperatures), this moment, fire box temperature required to be controlled at 180～350 ℃ and require furnace temperature even.Owing to carry out the thermal treatment of medium and high temperature tempering heat treatment heating is to adopt the heating of naked light burner, for making heat treatment furnace satisfy the firing system that thermal treatment process disposed of 350～730 ℃ of steel billet temperatures, furnace temperature for low temperature heat-treatment process desired 180～350 ℃ and good uniformity is difficult to guarantee, the low-temperature heat treatment of steel billet adds heat request and just is difficult to reach on the steel plate continuous heat treating furnace like this.For this reason, for realizing the low temperature heat-treatment process of steel plate, car-type heat treating furnace has been adopted in some workshop, carry out low-temperature heat by the hot gas that feeds Controllable Temperature, but can only steply produce, the problem of existence is to yield poorly, steel plate is yielding, and need to build separately process furnace, taken the workshop floor plan, increased investment; Also there is production plant on steel plate continuous heat treatment process furnace, to adopt naked light burner heating and carries out disturbance to realize the homogeneity of fire box temperature by feeding high velocity air, but poor effect mainly is that the big and temperature uniformity of complex structure, power and dielectric dissipation can't meet the demands.
Summary of the invention
The purpose of this invention is to provide a kind of method of utilizing the steel plate continuous heat treating furnace to carry out low-temperature tempering heat treatment, this method is simple, can carry out low-temperature tempering heat treatment.
For achieving the above object, the present invention has adopted following technical scheme: utilize the steel plate continuous heat treating furnace to carry out the method for low-temperature tempering heat treatment, it is characterized in that it comprises the steps:
1) on the air main of the combustion air air supply line system of steel plate continuous heat treating furnace, connects a hot gas transport pipe, hot gas transport pipe and temperature are that 250～400 ℃, the hot gas source of Controllable Temperature are connected, the hot gas transport pipe is provided with first switch valve, the air main of combustion air air supply line system is provided with second switch valve, and second switch valve is connected between the hot gas transport pipe place on burner blower and air main;
When 2) steel plate carries out low-temperature tempering heat treatment, close second switch valve, open first switch valve, the combustion air air supply line system of hot gas transport pipe by the steel plate continuous heat treating furnace, in burner hearth, provide hot gas from preheating burner heating system, making the temperature in the burner hearth is 180～350 ℃, and steel plate is low-temperature tempering heat treatment heating { low temperature (150～250 ℃ of steel billet temperatures) } in the burner hearth of steel plate continuous heat treating furnace.
Hot gas is warm air or hot flue gas.
The invention has the beneficial effects as follows:
1) adopts the air main of combustion air air supply line system to be connected, and switch by first switch valve, second switch valve with the hot gas transport pipe; Close first switch valve, open second switch valve, the steel plate continuous heat treating furnace can carry out original medium and high temperature tempering heat treatment heating process; Close second switch valve, open first switch valve, the hot gas transport pipe provides hot gas in the burner hearth of steel plate continuous heat treating furnace, realizes low temperature (steel billet temperature 150～250 ℃) the tempering heat treatment heating of steel plate at the continuous heat treating furnace burner hearth.Steel plate low-temperature tempering heat treatment heater artistic skill and medium and high temperature tempering heat treatment heater artistic skill are carried out quick, easy switching, and do not influence mutual result of use; Make and to be used for low-temperaturetempering (150～250 ℃ of the steel billet temperatures) thermal treatment that steel plate medium and high temperature tempered steel plate continuous heat treating furnace has been realized steel plate, and structure formation and system configuration are simple, do not change the configuration and the structure formation of steel plate continuous heat treating furnace, do not influence the high-temperature working performance of light plate continuous heat treating furnace.This method is simple.
2) features simple structure, reliable, be easy to realize.
Description of drawings
Fig. 1 is the structural representation of steel plate continuous heat treating furnace of the present invention.
Among the figure: 1-steel plate continuous heat treatment furnace body, 2-be from preheating burner heating system, 3-combustion air air supply line system, 4-gas line system, 5-fume exhaust system, 6-hot gas transport pipe, 7-first switch valve, 8-second switch valve, 9-steel plate continuous heat treating furnace medullary ray.A-hot gas access point, b-coal gas access point.
Embodiment
As shown in Figure 1, utilize the steel plate continuous heat treating furnace to carry out the method for low-temperature tempering heat treatment, it comprises the steps:
1) on the air main of the combustion air air supply line system of steel plate continuous heat treating furnace, connects a hot gas transport pipe, hot gas transport pipe and temperature are that 250～400 ℃, the hot gas source of Controllable Temperature are connected, hot gas is warm air or the hot flue gas that draws from other heat treatment furnaces, the hot gas transport pipe is provided with first switch valve, the air main of combustion air air supply line system is provided with second switch valve, and second switch valve is connected between the hot gas transport pipe place on burner blower and air main;
When 2) steel plate carries out low-temperature tempering heat treatment, close second switch valve, open first switch valve, the combustion air air supply line system of hot gas transport pipe by the steel plate continuous heat treating furnace, in burner hearth, provide hot gas from preheating burner heating system, making the temperature in the burner hearth is 180～350 ℃ (temperature in the burner hearth is regulated by the temperature of hot gas source), realize steel plate low temperature (150～250 ℃ of steel billet temperatures) tempering heat treatment in the burner hearth of steel plate continuous heat treating furnace, heat treatment time is controlled according to output and fire box temperature; When steel plate carries out the medium and high temperature tempering heat treatment, close first switch valve, open second switch valve, carry out the medium and high temperature tempering heat treatment by the working method of existing steel plate continuous heat treating furnace.
Steel plate continuous heat treating furnace as shown in Figure 1, it comprises steel plate continuous heat treatment furnace body 1, from preheating burner heating system 2, combustion air air supply line system 3, gas line system 4, fume exhaust system 5; From preheating burner heating system 2 in the preheating burner is arranged on the burner hearth of steel plate continuous heat treatment furnace body 1; Combustion air air supply line system 3 comprises burner blower, air main, air line, and the outlet of burner blower is connected with air line by air main, and air line is connected with the air-in from the preheating burner from preheating burner heating system 2; The delivery port of gas line system 4 is connected with the coal gas input aperture from the preheating burner from preheating burner heating system 2; Fume exhaust system 5 is connected with the smoke evacuation delivery port from the preheating burner from preheating burner heating system 2; The air main of combustion air air supply line system 3 is connected with hot gas transport pipe 6, hot gas transport pipe 6 and temperature are that 250～400 ℃ hot gas source is connected, hot gas transport pipe 6 is provided with first switch valve 7, the air main of combustion air air supply line system 3 is provided with second switch valve, 8, the second switch valves 8 and is connected between hot gas transport pipe 6 places on burner blower and air main.
Steel plate continuous heat treatment furnace body 1 by the steel construction housing, liner is fire-resistant and lagging material, steel plate carry equipment such as furnace roller, input and output material fire door to form; Form from the preheating burner by being installed in the steel plate continuous heat treatment furnace body 1 a plurality of on the furnace wall of both sides from preheating burner heating system 2, enter the air in the preheating burner and the burning of coal gas by tissue, to the burner hearth heat supplied, simultaneously the flue gas that produces after the burner hearth internal combustion is extracted out and entered in the atmosphere by fume exhaust system; Combustion air air feed system 3 is made up of gas blower, air main, air line, the various manually-operated gate that reaches automatically, is used for to supplying with combustion airs from preheating burner heating system 2; Gas line system 4 is made up of transport pipe, the various manually-operated gate that reaches automatically, is used for to supplying with coal gas from preheating burner heating system 2; Fume exhaust system 5 is made up of pipeline, regulated valve, smoke exhaust fan and chimney, is used for being discharged to atmosphere by the flue gas of extracting out in burner hearth from preheating burner heating system 2; Hot gas transport pipe 6 is used to insert the outside hot gas of supplying with; First switch valve 7, second switch valve 8 are used for switching the pipeline that needs are communicated with or close when preheating burner heating system 2 needs air or hot gas.
When the steel plate continuous heat treating furnace is carried adopting roller-way, during continuous steel plate by burner hearth carries out, during the pyritous tempering heat treatment, the steel plate Heating temperature is generally at 350～730 ℃, the desired temperature of burner hearth is generally at 400～800 ℃, this moment is by combustion air air supply line system 3, gas line system 4 is to from preheating burner heating system 2 air supplies and coal gas, first switch valve 7 is closed the hot gas pipeline, second switch valve 8 is opened the combustion air pipeline, by burning from preheating burner tissue, The pulse burning control technique by segmentation control makes from the preheating burner to the even heat supplied of burner hearth, reaches the desired target temperature of burner hearth and satisfies the temperature uniformity requirement.When the steel plate continuous heat treating furnace carries out cryogenic tempering heat treatment to continuous steel plate by burner hearth, the steel plate Heating temperature is generally at 150～250 ℃, the desired target temperature of burner hearth is generally at 180～350 ℃, because fire box temperature is low and temperature homogeneity requires high (± 10 ℃), adopt above-mentioned combustion air pipeline this moment, gas line reaches from the heat supply of preheating burner system, owing to will guarantee the stable burning of burner, therefore be to be difficult to reach needed fire box temperature, the uniformity requirement of fire box temperature particularly, the most feasible, way is exactly multiple spot winding-up in burner hearth reliably, the hot gas of supplying temperature and pressure-stabilisation, and, make fire box temperature reach desired target temperature by adjusting the temperature of hot gas.The described this heat-supplying mode of the present invention program is only to need to have increased on pipeline behind the gas blower of combustion air pipeline system a cover hot gas pipeline 6, first switch valve 7, second switch valve 8, by hot gas pipeline 6, combustion air pipeline system and can realize stable to burner hearth from preheating burner system, the multiple-point heat supply, features simple structure, need not change the steel plate continuous heat treating furnace fully in realizing, firing system and structure formation that the requirement of high tempering thermal treatment process is disposed, and can switch fast, satisfy steel plate continuous heat treating furnace burner hearth low-temperature heat treatment heating and in, the quick switching of high-temperature heat treatment heating, and when carrying out the low-temperature heat treatment heating, fire box temperature homogeneity better (can guarantee ± 5 ℃).
Claims (1)
1. utilize the steel plate continuous heat treating furnace to carry out the method for low-temperature tempering heat treatment, it is characterized in that it comprises the steps:
1) steel plate continuous heat treating furnace, it comprises steel plate continuous heat treatment furnace body (1), from preheating burner heating system (2), combustion air air supply line system (3), gas line system (4), fume exhaust system (5); From preheating burner heating system (2) in the preheating burner is arranged on the burner hearth of steel plate continuous heat treatment furnace body (1); Combustion air air supply line system (3) comprises burner blower, air main, air line, the outlet of burner blower is connected with air line by air main, and air line is connected with the air-in from the preheating burner from preheating burner heating system (2); The delivery port of gas line system (4) is connected with the coal gas input aperture from the preheating burner from preheating burner heating system (2); Fume exhaust system (5) is connected with the smoke evacuation delivery port from the preheating burner from preheating burner heating system (2);
On the air main of the combustion air air supply line system of steel plate continuous heat treating furnace, connect a hot gas transport pipe, hot gas transport pipe and temperature are that 250～400 ℃, the hot gas source of Controllable Temperature are connected, the hot gas transport pipe is provided with first switch valve, the air main of combustion air air supply line system is provided with second switch valve, and second switch valve is connected between the hot gas transport pipe place on burner blower and air main;
When 2) steel plate carries out low-temperature tempering heat treatment, close second switch valve, open first switch valve, the combustion air air supply line system of hot gas transport pipe by the steel plate continuous heat treating furnace, in burner hearth, provide hot gas from preheating burner heating system, making the temperature in the burner hearth is 180～350 ℃, and steel plate is the low-temperature tempering heat treatment heating in the burner hearth of steel plate continuous heat treating furnace.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2009100639495A CN101649378B (en) | 2009-09-11 | 2009-09-11 | Method for low-temperature tempering heat treatment by using steel plate continuous heat-treating furnace |
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| CN2009100639495A CN101649378B (en) | 2009-09-11 | 2009-09-11 | Method for low-temperature tempering heat treatment by using steel plate continuous heat-treating furnace |
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| CN101649378A CN101649378A (en) | 2010-02-17 |
| CN101649378B true CN101649378B (en) | 2011-04-20 |
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| CN102345000B (en) * | 2011-10-10 | 2013-08-07 | 莱芜钢铁集团有限公司 | Method for realizing low temperature tempering by medium-high temperature tempering furnace |
| CN103115489A (en) * | 2011-11-16 | 2013-05-22 | 宜兴市前锦炉业设备有限公司 | Full-automatic lithium battery ternary material sintering roller bed furnace |
| CN102492819B (en) * | 2011-12-27 | 2013-07-17 | 中冶南方(武汉)威仕工业炉有限公司 | High temperature continuous heat treatment furnace and method for low temperature tempering or annealing of steel with it |
| CN102492827B (en) * | 2011-12-27 | 2013-07-17 | 中冶南方(武汉)威仕工业炉有限公司 | Multifunctional continuous heat treatment furnace and heat treatment method |
| JP5881785B2 (en) * | 2014-07-30 | 2016-03-09 | 中外炉工業株式会社 | Combustion control method for continuous heat treatment furnace and remodeling method for continuous heat treatment furnace |
| CN110607429B (en) * | 2019-09-27 | 2021-03-16 | 中冶南方（武汉）热工有限公司 | Roller hearth type plate continuous furnace and tempering method thereof |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1039265A (en) * | 1988-07-12 | 1990-01-31 | 花礼先 | Produce the novel method of roller chain with low-carbon low-alloy steel |
| CN2075205U (en) * | 1990-10-16 | 1991-04-17 | 袁军 | Low-temp. tempering heat treating furnace for cutter soldering |
| CN2237826Y (en) * | 1995-09-30 | 1996-10-16 | 胡德华 | Controllable waste heat low-temp temper furnace |
-
2009
- 2009-09-11 CN CN2009100639495A patent/CN101649378B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1039265A (en) * | 1988-07-12 | 1990-01-31 | 花礼先 | Produce the novel method of roller chain with low-carbon low-alloy steel |
| CN2075205U (en) * | 1990-10-16 | 1991-04-17 | 袁军 | Low-temp. tempering heat treating furnace for cutter soldering |
| CN2237826Y (en) * | 1995-09-30 | 1996-10-16 | 胡德华 | Controllable waste heat low-temp temper furnace |
Non-Patent Citations (1)
| Title |
|---|
| JP特开2005-201606A 2005.07.28 |
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