CN110117708A - A kind of process for quenching of thin specification steel plate - Google Patents
A kind of process for quenching of thin specification steel plate Download PDFInfo
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- CN110117708A CN110117708A CN201910364807.6A CN201910364807A CN110117708A CN 110117708 A CN110117708 A CN 110117708A CN 201910364807 A CN201910364807 A CN 201910364807A CN 110117708 A CN110117708 A CN 110117708A
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- quenching
- water
- steel plate
- furnace
- thin specification
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- 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
- C21D1/18—Hardening; Quenching with or without subsequent tempering
-
- 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
- C21D9/46—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for sheet metals
Abstract
The present invention relates to a kind of process for quenching of thin specification steel plate; the steel plate with a thickness of 4~80mm; the production stage of the process for quenching includes: heating period, water-spraying control stage; the equipment that the heating period uses is quenching normalizing furnace; the quenching normalizing furnace is continuous roller bottom type; nitrogen is connected in furnace; the heating temperature for quenching normalizing furnace is 890~910 DEG C; the quenching normalizing furnace is heated using two rows radiant tube, 5 DEG C of the furnace temperature fluctuation amplitude < of the quenching normalizing furnace；The equipment that the water-spraying control stage uses is quenching press, pressing roller is vertically disposed in quenching press, quenching press working method is roll-in continuous quenching, the water-spraying control stage is divided into two kinds of hardness patterns of winter and summer, the medium that the water-spraying control stage uses is recirculated cooling water, 35 DEG C of the water temperature < of the recirculated cooling water.The present invention solves the problems, such as thin specification steel plate buckling deformation in quenching, keeps thin specification steel plate quenching straightness stably and controllable.
Description
Technical field
The present invention relates to a kind of process for quenching of thin specification steel plate, belong to technical field of heat treatment.
Background technique
Thin gauge quenched nickelclad is mainly used in construction machinery industry, important set of the engineering machinery as China's equipment manufacturing industry
The survival and development at part, concerning the big industry of building, water conservancy, electric power, road, mine, harbour, national defence etc. seven.In recent years, with
Equipment to enlargement, high-performance, lightweight development, steel used in engineering machinery have developed to Q890, Q960 rank of today,
Wherein high-strength plate Q550, Q690 accounts for 70% or so of the total dosage of steel plate.For regular tenacity steel plate, high-strength steel sheet is
Refer to yield strength >=550Mpa, the i.e. series of products such as Q550, Q690, Q890, Q960, wherein the yield strength of Q890 high-strength plate mentions
5 times are risen, has been frequently used for " blade " of hoister in large tonnage --- " blade " of boom, coal excavation apparatus --- hydraulic support.It is thin
The production of size high-tensile plate has represented high-end plate used in current equipment manufacture, is able to produce and supplies such steel
Plate represents the technical level of an iron and steel enterprise.
The high-strength plate of existing thin gauge either import or domestic production all in the prevalence of the template problem of steel plate,
I.e. buckling deformation can occur in quenching process for steel plate, and the type of buckling deformation includes edge shape wave, intermediate arch, middle concave
Button under shape, both ends, both ends upwarp, positive pot-shaped and pot-shaped etc., and buckling deformation will affect the processing and use in steel plate later period.
Summary of the invention
The object of the present invention is to provide a kind of process for quenching of thin specification steel plate, solve thin specification steel plate and stick up in quenching
The problem of song deformation, keeps thin specification steel plate quenching straightness stably and controllable.
To achieve the goals above, the technical solution adopted by the present invention is that:
A kind of process for quenching of thin specification steel plate, the steel plate with a thickness of 4~80mm, the production of the process for quenching walks
It suddenly include: heating period, water-spraying control stage,
For the equipment that the heating period uses to quench normalizing furnace, the quenching normalizing furnace is continuous roller bottom type, is led in furnace
There is nitrogen, the heating temperature for quenching normalizing furnace is 890~910 DEG C, and heating temperature is when C content is between 0.05~0.09%
840~870 DEG C, the quenching normalizing furnace is heated using two rows radiant tube, the furnace temperature fluctuation of the quenching normalizing furnace
5 DEG C of amplitude <；
The equipment that the water-spraying control stage uses is vertically disposed with pressing roller, quenching press work for quenching press in quenching press
Making mode is roll-in continuous quenching, and the water-spraying control stage is divided into two kinds of hardness patterns of winter and summer, the water-spraying control
The medium that stage uses is recirculated cooling water, 35 DEG C of the water temperature < of the recirculated cooling water.
Technical solution of the present invention further improvement lies in that: 30~60m/min of roller speed of the pressing roller.
Technical solution of the present invention further improvement lies in that: the water-spraying control stage be divided into winter and two kinds of summer quenching
Mode.
Technical solution of the present invention further improvement lies in that: the pressing roller roller speed of the winter hardness pattern is quenched greater than summer
Fiery mode.
Technical solution of the present invention further improvement lies in that: the water-spraying control stage includes higher-pressure region and low-pressure area, institute
Quenching press is stated to spray water to the upper and lower surfaces of steel plate.
Technical solution of the present invention further improvement lies in that: the higher-pressure region hydraulic pressure be 8Mpa, the higher-pressure region is all made of
Injection pipe is cooling, and the ratio of amount of water sprayed of the higher-pressure region to upper surface and the amount of water sprayed to lower surface is 0.72~0.80, described
The benchmark water of higher-pressure region sparge pipe is all different.
Technical solution of the present invention further improvement lies in that: the low-pressure area hydraulic pressure is 4Mpa, and the low-pressure area is all made of
Injection pipe is cooling.
Technical solution of the present invention further improvement lies in that: the recirculated cooling water in cyclic process be equipped with filter device
Carry out decontamination cycle cooling water, the recirculated cooling water also needs to regularly replace.
Technical solution of the present invention further improvement lies in that: the water temperature of the recirculated cooling water by establish have temperature-compensating
Coefficient is corrected.
By adopting the above-described technical solution, the technical effect that the present invention obtains has:
1, by the adjustment to hardness pattern, the water-spraying control stage higher-pressure region and low-pressure area have been divided into, in higher-pressure region
Regulating and controlling quenching press pressing roller roller speed, higher-pressure region the ratio between water and the water temperature of recirculated cooling water up and down, triplicity solves 4~
The quenching buckling deformation problem of 80mm thin specification steel plate keeps 4~80mm thin specification steel plate quenching straightness stably and controllable.
2, the comprehensive qualified rate of product is improved by the adjustment to higher-pressure region hardness pattern, the qualification rate of template reaches
99.8%, the supportability of product quality in kind is also further enhanced, product specification size range has been expanded, has shortened product
Delivery cycle.
3, the water quality that the water-spraying control stage uses can reduce the waste of water resource by recycling for recirculated cooling water.
4, the water temperature foundation of recirculated cooling water has temperature compensation coefficient, is compensated by the monitoring combination temperature to quenching water temperature
Then coefficient is corrected process for quenching to reach optimal quenching effect.
5, a kind of process for quenching of thin specification steel plate of the invention can significantly promote compared to traditional process for quenching
Autonomous abrasion-resistant stee and high-strength plate exploitation and production.
Specific embodiment
The present invention is described in further details combined with specific embodiments below:
The invention discloses a kind of process for quenching of thin specification steel plate, quenching is that steel is heated to Ac3 or Ac1 or more 30-
50 degree, heat preservation --- (> vk) is quickly cooled down to obtain the process of martensite, be can be improved the hardness and wearability of steel, is mentioned
For the basic organization and performance of quenched tempering.The steel plate that the present invention can process with a thickness of 4~80mm, production stage packet
It includes: heating period and water-spraying control stage.
To quench normalizing furnace, quenching normalizing furnace is continuous roller bottom type and is connected with nitrogen in furnace the equipment that heating period uses
Gas is heated using radiant tube, and radiant tube is symmetrical arranged along the burner hearth two rows of quenching normalizing furnace, and pulse control is fired automatically
It burns.The heating temperature for quenching normalizing furnace is 890~910 DEG C, and when C content is between 0.05~0.09%, heating temperature is 840
~870 DEG C, while guaranteeing furnace temperature fluctuation less than 5 DEG C.
The equipment that the water-spraying control stage uses is quenching press, and quenching press working method is roll-in continuous quenching, in quenching press
The symmetrical pressing roller of two rows is installed, the roller speed range of pressing roller is 30~60m/min.It is symmetrical above and below in quenching press to set
It is equipped with 18 groups of injection pipes to carry out spray cooling to thin specification steel plate, the water-spraying control stage is divided into two kinds of quenching moulds of winter and summer
Formula, room temperature is lower in winter, the cooling velocity of steel plate is fast, it is possible to accelerate steel plate and increase in the speed in water-spraying control stage
The cooling efficiency of steel plate.The pressing roller roller speed of general winter hardness pattern is 55m/min, the pressing roller roller speed of summer hardness pattern
For 35m/min.
The water-spraying control stage includes higher-pressure region and low-pressure area, and wherein higher-pressure region shares 14 groups of injection pipes, and higher-pressure region hydraulic pressure is
8Mpa, higher-pressure region is cooling using injection pipe setting up and down, and higher-pressure region water is up and down than being 0.72~0.80, the benchmark of higher-pressure region
Water is as shown in table 1；Low-pressure area hydraulic pressure is 4Mpa, and low-pressure area is equally cooling using injection pipe setting up and down.
1 higher-pressure region of table quenches benchmark water
Unit: m3/h
| Sparge pipe | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 |
| Water | 92 | 263 | 92 | 118 | 338 | 118 | 37 | 214 | 37 | 47 | 275 | 47 | 285 | 365 |
The steel plate of thin gauge solves thin specification steel plate buckling deformation after the above heating period and water-spraying control stage
The problem of, make the surfacing of thin specification steel plate, the production and processing that can satisfy subsequent thin specification steel plate uses needs.
Embodiment 1
The present embodiment is integral quenching further improvements in methods:
To quench normalizing furnace, quenching normalizing furnace is continuous roller bottom type and is connected with nitrogen in furnace the equipment that heating period uses
Gas is heated using radiant tube, and radiant tube is symmetrical arranged along the burner hearth two rows of quenching normalizing furnace, and pulse control is fired automatically
It burns；Shotblasting processing is carried out into stokehold in steel plate, iron scale is removed, causes furnace hearth roller salamander in furnace to prevent bringing into, together
When guarantee furnace temperature fluctuation less than 5 DEG C.
The medium that the water-spraying control stage uses is recirculated cooling water, 35 DEG C of the water temperature < of recirculated cooling water, recirculated cooling water
It is equipped with filter device during circulation and carrys out decontamination cycle cooling water, recirculated cooling water is during circulation by filling from filtering
Set top and downwards purify while needing to be added medicament auxiliary and purify, and need before recirculated cooling water enters quenching press into
Row secondary filter, it is ensured that water quality it is pure.It needs to be replaced regularly for the recirculated cooling water that the water-spraying control stage uses simultaneously；Together
When recirculated cooling water water temperature foundation have temperature compensation coefficient as shown in Table 2, pass through to quenching water temperature monitoring combination temperature
Penalty coefficient, the flow of following table recirculated cooling water in adjustment reach to be adjusted according to the water temperature of recirculated cooling water and realize cooling mesh
, optimal quenching effect can be reached by being corrected to process for quenching.
2 temperature compensation coefficient of table
| Temperature DEG C | 26 | 28 | 30 | 32 | 35 |
| Upper table | 0.8 | 0.9 | 1.0 | 1.1 | 1.3 |
| Following table | 0.9 | 1.0 | 1.0 | 1.0 | 1.1 |
Embodiment 2
The present embodiment is further detailed operation process on the basis of embodiment 1:
Select the thin specification steel plate with a thickness of 12mm.The equipment that heating period uses quenches normalizing furnace to quench normalizing furnace
It is connected with nitrogen for continuous roller bottom type and in furnace, is heated using radiant tube, radiant tube is above and below the burner hearth of quenching normalizing furnace
Two rows are symmetrical arranged, pulse control automatic combustion；Shotblasting processing is carried out into stokehold in steel plate, removes iron scale, with
Anti- bring into causes furnace hearth roller salamander in furnace；Guarantee furnace temperature fluctuation less than 5 DEG C simultaneously.
The equipment that the water-spraying control stage uses is quenching press, and quenching press working method is roll-in continuous quenching, in quenching press
The symmetrical pressing roller of two rows is installed, the roller speed range of pressing roller is 30m/min, and the water temperature of recirculated cooling water is set as 26
℃。
The higher-pressure region in water-spraying control stage is cooling using injection pipe setting up and down, the injection pipe that higher-pressure region is disposed over
It sprays downwards and forms water curtain, the water ratio of higher-pressure region water curtain and lower section injection pipe is 0.72.In thin specification steel plate quenching production,
The cooling of steel plate mainly determines that higher-pressure region water curtain and the runoff investigation of lower section injection pipe are main by 1-6 group sparge pipe before higher-pressure region
For preceding 1-6 group.
Thin specification steel plate is being 30m/min, height by the heating period and quenching press pressing roller roller speed of quenching normalizing furnace
The water of 1-6 group water curtain and lower section injection pipe is than being set as 26 DEG C of effect for the water temperature of 0.72 and recirculated cooling water before pressure area
Under, the surfacing of thin specification steel plate, the production and processing that can satisfy subsequent thin specification steel plate uses needs.
Embodiment 3
The present embodiment is further detailed operation process on the basis of embodiment 1:
Select the thin specification steel plate with a thickness of 9mm.To quench normalizing furnace, quenching normalizing furnace is the equipment that heating period uses
Continuous roller bottom type and it is connected with nitrogen in furnace, is heated using radiant tube, burner hearth up and down two of the radiant tube along quenching normalizing furnace
Row is symmetrical arranged, pulse control automatic combustion；Shotblasting processing is carried out into stokehold in steel plate, removes iron scale, to prevent
It brings into and causes furnace hearth roller salamander in furnace；Guarantee furnace temperature fluctuation less than 5 DEG C simultaneously.
The equipment that the water-spraying control stage uses is quenching press, and quenching press working method is roll-in continuous quenching, in quenching press
The symmetrical pressing roller of two rows is installed, the roller speed range of pressing roller is 40m/min, and the water temperature of recirculated cooling water is set as 28
℃。
The higher-pressure region in water-spraying control stage is cooling using injection pipe setting up and down, the injection pipe that higher-pressure region is disposed over
It sprays downwards and forms water curtain, the water ratio of higher-pressure region water curtain and lower section injection pipe is 0.74.In thin specification steel plate quenching production,
The cooling of steel plate mainly determines that higher-pressure region water curtain and the runoff investigation of lower section injection pipe are main by 1-6 group sparge pipe before higher-pressure region
For preceding 1-6 group.
Thin specification steel plate is being 40m/min and height by the heating period and quenching press pressing roller roller speed of quenching normalizing furnace
The water of 1-6 group water curtain and lower section injection pipe is than being set as 28 DEG C of effect for the water temperature of 0.74 and recirculated cooling water before pressure area
Under, the surfacing of thin specification steel plate, the production and processing that can satisfy subsequent thin specification steel plate uses needs.
Embodiment 4
The present embodiment is further detailed operation process on the basis of embodiment 1:
Select the thin specification steel plate with a thickness of 6mm.To quench normalizing furnace, quenching normalizing furnace is the equipment that heating period uses
Continuous roller bottom type and it is connected with nitrogen in furnace, is heated using radiant tube, burner hearth up and down two of the radiant tube along quenching normalizing furnace
Row is symmetrical arranged, pulse control automatic combustion；Shotblasting processing is carried out into stokehold in steel plate, removes iron scale, to prevent
It brings into and causes furnace hearth roller salamander in furnace；Guarantee furnace temperature fluctuation less than 5 DEG C simultaneously.
The equipment that the water-spraying control stage uses is quenching press, and quenching press working method is roll-in continuous quenching, in quenching press
The symmetrical pressing roller of two rows is installed, the roller speed range of pressing roller is 50m/min, and the water temperature of recirculated cooling water is set as 30
℃。
The higher-pressure region in water-spraying control stage is cooling using injection pipe setting up and down, the injection pipe that higher-pressure region is disposed over
It sprays downwards and forms water curtain, the water ratio of higher-pressure region water curtain and lower section injection pipe is 0.76.In thin specification steel plate quenching production,
The cooling of steel plate mainly determines that higher-pressure region water curtain and the runoff investigation of lower section injection pipe are main by 1-6 group sparge pipe before higher-pressure region
For preceding 1-6 group.
Thin specification steel plate is being 50m/min and height by the heating period and quenching press pressing roller roller speed of quenching normalizing furnace
The water of 1-6 group water curtain and lower section injection pipe is than being set as 20 DEG C of effect for the water temperature of 0.76 and recirculated cooling water before pressure area
Under, the surfacing of thin specification steel plate, the production and processing that can satisfy subsequent thin specification steel plate uses needs.
Embodiment 5
The present embodiment is further detailed operation process on the basis of embodiment 1:
Select the thin specification steel plate with a thickness of 4mm.To quench normalizing furnace, quenching normalizing furnace is the equipment that heating period uses
Continuous roller bottom type and it is connected with nitrogen in furnace, is heated using radiant tube, burner hearth up and down two of the radiant tube along quenching normalizing furnace
Row is symmetrical arranged, pulse control automatic combustion；Shotblasting processing is carried out into stokehold in steel plate, removes iron scale, to prevent
It brings into and causes furnace hearth roller salamander in furnace；Guarantee furnace temperature fluctuation less than 5 DEG C simultaneously.
The equipment that the water-spraying control stage uses is quenching press, and quenching press working method is roll-in continuous quenching, in quenching press
The symmetrical pressing roller of two rows is installed, the roller speed range of pressing roller is 60m/min, and the water temperature of recirculated cooling water is set as 35
℃。
The higher-pressure region in water-spraying control stage is cooling using injection pipe setting up and down, the injection pipe that higher-pressure region is disposed over
It sprays downwards and forms water curtain, the water ratio of higher-pressure region water curtain and lower section injection pipe is 0.80.In thin specification steel plate quenching production,
The cooling of steel plate mainly determines that higher-pressure region water curtain and the runoff investigation of lower section injection pipe are main by 1-6 group sparge pipe before higher-pressure region
For preceding 1-6 group.
Thin specification steel plate is being 60m/min and height by the heating period and quenching press pressing roller roller speed of quenching normalizing furnace
The water of 1-6 group water curtain and lower section injection pipe is than being set as 35 DEG C of effect for the water temperature of 0.80 and recirculated cooling water before pressure area
Under, the surfacing of thin specification steel plate, the production and processing that can satisfy subsequent thin specification steel plate uses needs.
The process for quenching of thin specification steel plate of the present invention will be quenched by the change to process for quenching and hardness pattern
The water-spraying control stage design of fire is higher-pressure region and low-pressure area, in order to which the cooling for guaranteeing steel plate upper and lower surface is uniform in higher-pressure region
Property, the cooling water flow appropriate for increasing lower surface of steel plate, so that the ratio of water up and down of higher-pressure region is less than 1；The cooling of steel plate
Uniformity also suffers from the Water Temperature of recirculated cooling water, establishes temperature-compensating compensation system by carrying out combing to quenching water temperature
Number can make hardness pattern reach optimal quenching effect the monitoring combination temperature penalty coefficient of quenching water temperature；Steel plate is spraying
Longitudinal wave can be generated during water cooling stage, can eliminate longitudinal wave by adjusting quenching press pressing roller roller speed.
Process for quenching of the invention solves the problems, such as the quenching buckling deformation of thin specification steel plate, keeps thin specification steel plate quenching flat
It is straight stably and controllable, the comprehensive qualified rate of product is improved, the supportability of product quality in kind is also further enhanced, is expanded
Product specification size range shortens the product delivery cycle, improves product competitiveness and market profitability.
The embodiment of present embodiment is presently preferred embodiments of the present invention, not limits protection of the invention according to this
Range, therefore: the equivalence changes that all structures under this invention, shape, principle, method etc. are done should all be covered by guarantor of the invention
Within the scope of shield.
Claims (8)
1. a kind of process for quenching of thin specification steel plate, which is characterized in that the steel plate with a thickness of 4~80mm, the quenching side
The production stage of method includes: heating period, water-spraying control stage,
For the equipment that the heating period uses to quench normalizing furnace, the quenching normalizing furnace is continuous roller bottom type, is connected with nitrogen in furnace
Gas, the heating temperature for quenching normalizing furnace is 890~910 DEG C, when C content is between 0.05~0.09% heating temperature be 840~
870 DEG C, the quenching normalizing furnace is heated using two rows radiant tube, the furnace temperature fluctuation amplitude < of the quenching normalizing furnace
5℃；
The equipment that the water-spraying control stage uses is vertically disposed with pressing roller, quenching press work side for quenching press in quenching press
Formula is roll-in continuous quenching, and the water-spraying control stage is divided into two kinds of hardness patterns of winter and summer, the water-spraying control stage
The medium used is recirculated cooling water, 35 DEG C of the water temperature < of the recirculated cooling water.
2. a kind of process for quenching of thin specification steel plate according to claim 1, it is characterised in that: the roller speed of the pressing roller
30~60m/min.
3. a kind of process for quenching of thin specification steel plate according to claim 2, it is characterised in that: the winter hardness pattern
Pressing roller roller speed be greater than summer hardness pattern.
4. a kind of process for quenching of thin specification steel plate according to claim 1, it is characterised in that: the water-spraying control stage
Including higher-pressure region and low-pressure area, the quenching press sprays water to the upper and lower surfaces of steel plate.
5. a kind of process for quenching of thin specification steel plate according to claim 4, it is characterised in that: the higher-pressure region hydraulic pressure is
8Mpa, the higher-pressure region are all made of injection pipe cooling, amount of water sprayed of the higher-pressure region to upper surface and the amount of water sprayed to lower surface
Ratio be 0.72~0.80, the benchmark water of the higher-pressure region sparge pipe is all different.
6. a kind of process for quenching of thin specification steel plate according to claim 4, it is characterised in that: the low-pressure area hydraulic pressure is
4Mpa, it is cooling that the low-pressure area is all made of injection pipe.
7. a kind of process for quenching of thin specification steel plate according to claim 1, it is characterised in that: the recirculated cooling water exists
It is equipped with filter device in cyclic process and carrys out decontamination cycle cooling water, the recirculated cooling water also needs to regularly replace.
8. a kind of process for quenching of thin specification steel plate according to claim 1, it is characterised in that: the recirculated cooling water
Water temperature has temperature compensation coefficient by foundation to be corrected.
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ID=67520365
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|---|---|---|---|---|
| CN110983027A (en) * | 2019-12-30 | 2020-04-10 | 晟普特(北京)防护科技有限公司 | Shape control method for thin quenched steel plate |
| CN113894159A (en) * | 2021-09-30 | 2022-01-07 | 中冶赛迪上海工程技术有限公司 | Hot-rolled strip steel heat treatment processing method |
| CN114182066A (en) * | 2021-11-01 | 2022-03-15 | 南京钢铁股份有限公司 | Production method for high-quality surface control of quenching plate |
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