CN109423541A - The process units and method of steel pipe off-line quenching - Google Patents
The process units and method of steel pipe off-line quenching Download PDFInfo
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- CN109423541A CN109423541A CN201710779250.3A CN201710779250A CN109423541A CN 109423541 A CN109423541 A CN 109423541A CN 201710779250 A CN201710779250 A CN 201710779250A CN 109423541 A CN109423541 A CN 109423541A
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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
- C21D1/62—Quenching devices
- C21D1/667—Quenching devices for spray quenching
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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
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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
- C21D11/00—Process control or regulation for heat treatments
- C21D11/005—Process control or regulation for heat treatments for cooling
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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
- 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
- C21D9/085—Cooling or quenching
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Abstract
The invention discloses the process units and method of a kind of quenching of steel pipe off-line.The process units includes outer spray cooling device and interior spray cooling device, and interior spray cooling device implements inner shaft stream spray cooling to the steel pipe of rotation；It is cooling that outer spray cooling device implements outer spray pressurized jet to the steel pipe (10) of rotation, and outer spray cooling device includes that direct-injection cooling device (7), steel pipe upset end tiltedly spray cooling device (8) and contact roller water replanishing device (9)；Direct-injection cooling device includes multiple spray boxs, and each spray box front end is provided with multiple rows of nozzle, and spray box rear end connects inlet pipeline, flowmeter and flow control valve is housed on inlet pipeline, flowmeter connects controller with flow control valve；It includes spray box that steel pipe upset end, which tiltedly sprays cooling device, spray box front end is provided with multiple rows of nozzle, it include multiple inner cavities in spray box, each inner cavity is connected with inlet pipeline and flowmeter and flow control valve, and tiltedly spraying between the spray box of cooling device and the spray box of direct-injection cooling device has an angle.
Description
Technical field
The process units quenched the present invention relates to a kind of steel pipe heat treatment technics more particularly to a kind of steel pipe off-line and side
Method.
Background technique
There are four master operations on steel pipe heat-treatment lines: quenching stove heating, water quenching, tempering stove heating, thermal straightening, therein
Water quenching process, which will generally use, to carry out the type of cooling drenched outside interior spray after steel pipe compression rotation, and China and foreign countries' shower device generally uses low
Press water drenching mode.
And water quenching often becomes bottleneck process, the main reason is that the outer cool equipment of water quenching used at present, either slit
Or spray tube, generallys use the liquid distribution of fixed low pressure, cooling capacity is limited, can not effectively mention enlargement discharge
High cooldown rate causes production efficiency not high, materials in the tube exist so that being far longer than the time of other process the time required to steel pipe water quenching
The furnace time is longer, and surface oxidation is serious, and energy consumption is also big.
When using leaching mode is quenched outside interior spray, even if flow is adjustable on the outer water drenching length direction of fixed low pressure, due to
It is difficult to break up moisture film, difference is little in the cooling rate of appearance, and interior water spray flows to the other end from steel pipe one end, and the cooling rate of interior table is poor
Different larger, which results in the cooling rate differences of steel pipe different location, and big so as to cause the quenched rear strength fluctuation of steel pipe, all-steel-pipe is strong
Degree fluctuation is generally in 80 ~ 150MPa, and water cooling rear portion is in charge of that material bending is excessively serious, and materials in the tube are directly spent still exceeded after aligning,
It needs to handle again again, increases production cost.
For line pipe, the structural tube etc. of series of low-carbon, it is desirable that slower cooling rate, it is only necessary to which the flow of very little, fixation are low
The outer water spray of pressure will be very uneven, and bending is serious after water cooling, easily damage rotation facility, and can not be successfully conveying and need people
Work intervention, so that production efficiency is lower.
Chinese patent CN2307006Y discloses a kind of Water spray device for steel pipe outside surface, and the fixation using single cooling water pipe is low
Pressure spray pattern, cooling rate and even property are limited, and the steel pipe of especially Large Diameter Pipeline is difficult to obtain effective uniformly cooling.
Chinese patent CN201046978Y discloses a kind of Double-venting external sprayer, using the fixation low pressure of double cooling water pipe
Pattern is sprayed, cooling rate is lower, if cooling water falls in steel pipe top, is easy to splash, cooling efficiency is poor, if cooling water
Two sides are fallen in, then since double spray tube height is different, the different inhomogeneous cooling that will lead to of hydraulic pressure current difference is even, and it is single double
It is mixed, it only uses more uneven when row's spray tube.
Chinese patent CN101490286A discloses a kind of cooling method of steel pipe, using double laminar flow slit pattern, slit
Laminar flow will form stable curtain dress water flow, and length and range of flow are limited, and length direction flow is non-adjustable, is not suitable for adjusting
The quenching of matter steel pipe is also only applicable to specific wall thickness/outer diameter ratio steel pipe from the point of view of its description.
Chinese patent CN202705412U discloses a kind of outer water drenching spray equipment of steel pipe quenching, using double cooling water
Distributed amongst water tank is arranged in the Low-pressure spray pattern of pipe, although being equipped with flow control valve, opens from main from the point of view of description
The effect of valve is closed, and does not have pressure control device, is difficult to keep the flow equalization of tube body overall length.
Chinese patent CN204474716U discloses a kind of outer spray equipment of quenching press, using the low of double cooling water pipe
Pressure spray pattern, is arranged equal pressure tank counterpressure, although can provide uniform pressure and flow to tube body overall length, once
Pressure is that fixation is non-adjustable, and overall length flow is also substantially stationary after the completion of device manufacturing.
The above steel pipe off-line quenching unit mainly using the outer spray form of fixed low pressure water drenching, cooling rate it is lower and
It is limited, the quenched quenching of spray in outer leaching can not be suitable for, can not effectively shorten the steel pipe cool time.Meanwhile double flow pressure
Nonadjustable configuration, it is difficult to meet the quenching technical demand of various specifications steel pipe；Since double rows of nozzles is arranged symmetrically, for tubule
Diameter steel pipe can only meet cooling technique using single row of nozzles, it is easier to cause circumferential inhomogeneous cooling even.
The outer cool equipment of water quenching used at present, there is no the moisturizing Cooling Design specifically for upset end, it is difficult to meet and thicken
The integral quenching demand of steel pipe.Although part cooling device, which uses multiple cooling spray box, carries out sub-sectional cooling to steel pipe overall length,
Theoretically cooling water inflow can be increased to upset end, once but tube body setting flow reaches or approaches the upper limit, upset end increase
Flow it is just very limited, or even can not increase；Also, even if increasing the flow of upset end, but due to cooling water and steel pipe
Contact area be kept approximately constant, so increase cooling rate it is also very limited, for improve upset end performance quality, contracting
Short cool time effect is little；Simultaneously as the upset end difference in length of each specification steel pipe, the design and mark of the external cool equipment of meeting
It is fixed to increase very big difficulty, it is also difficult to ensure the stabilization of cooling procedure grey water system.
Summary of the invention
The purpose of the present invention is to provide the process units and method of a kind of quenching of steel pipe off-line.The present invention implements steel pipe
Quick uniform is cooling, and overall length is straight after quenching steel pipe and performance is uniform, reduces slewing loss, and contract significantly
The time of short bottleneck process -- water quenching reduces materials in the tube time inside furnace to improve production efficiency, reduces energy consumption, improves materials in the tube table
Face oxidation.
In order to achieve the above technical purposes, the present invention adopts the following technical scheme:
A kind of process units of steel pipe off-line quenching, including outer spray cooling device and interior spray cooling device, interior spray cooling device pair
The steel pipe of rotation implements inner shaft stream spray cooling；
The outer spray cooling device implements outer spray pressurized jet cooling to the steel pipe of rotation, and outer spray cooling device includes that direct-injection is cooling
Device and steel pipe upset end tiltedly spray cooling device；
The direct-injection cooling device includes multiple spray boxs, which is set to above the rotary stand of placing steel tubes, each spray box
Front end is provided with multiple rows of nozzle, and against following steel pipe, spray box rear end connects inlet pipeline for spray box front end, is equipped on inlet pipeline
Flowmeter and flow control valve, flowmeter and flow control valve connect controller, inlet pipeline water receiving collector, and water collector passes through change
The pressurization of frequency water pump is supplied water, and variable frequency pump connects controller；The multiple spray box is arranged in a column, and the steel pipe faced directly below corresponding to is long
Spend direction；
It includes spray box that the steel pipe upset end, which tiltedly sprays cooling device, which is set to the rotary stand upper side of placing steel tubes,
Spray box front end is provided with multiple rows of nozzle, and spray box front end is against following steel pipe head or tail portion, and interior spray box includes multiple inner cavities, often
A inner cavity is connected with inlet pipeline, flowmeter and flow control valve is housed on inlet pipeline, flowmeter is connected with flow control valve
Controller, inlet pipeline connect water inlet collector, and water inlet collector is pressurizeed by variable frequency pump and supplied water, and variable frequency pump connects controller；It is described
Spray box has an angle against steel pipe partially along the vertical center line of steel tube section, i.e., tiltedly the spray box of spray cooling device and direct-injection are cooling
There is an angle between the spray box of device.
The outer spray cooling device further includes contact roller water replanishing device, and contact roller water replanishing device includes multiple nozzles, multiple
Nozzle connects inlet pipeline, and nozzle is located at below contact roller, and nozzle is from the bottom up against steel pipe water-spraying control.
The nozzle of the direct-injection cooling device is multiple rows of stagger arrangement arrangement.
The nozzle of the oblique spray cooling device is multiple rows of stagger arrangement arrangement.
The spray box cavity length of the oblique spray cooling device is according to the transition section length L of steel pipe thick sectiongIt is long with upset end
Spend LjSetting.
The spray box of the oblique spray cooling device there are two one end of steel pipe head or tail portion, along steel tube section it is vertical in
Heart line is symmetrical arranged.
A kind of production method of steel pipe off-line quenching, the steps include:
First, before steel pipe quenching production starts, corresponding pressure and flow are set according to the steel grade of steel pipe and specification, including interior
Portion is cooling and outside is cooling, and internal cooling is that interior spray cooling device implements inner shaft to the steel pipe of rotation with given pressure and flow
Spray cooling is flowed, external cooling is that outer spray cooling device is cooling to the outer spray pressurized jet of steel pipe implementation of rotation, and outer spray is cooling to be filled
The direct-injection cooling device setting pressure and flow set, contact roller water replanishing device is with given pressure and flow spray cooling；
Second, after first steel pipe is heated to temperature, according to the pressure and flow of setting, controller is by the stream of direct-injection cooling device
Adjustable valve is opened to corresponding aperture, opens the switch valve of inlet pipeline, finely tunes after pressure is stablized further according to actual flow
Flow control valve adjusts flow to tolerance permitted range；The aperture of flow control valve therein and the relationship of pressure and flow
It is demarcated first before direct-injection cooling device comes into operation, determines the corresponding flow of different opening at various pressures, control
Device processed stores it；Water fender is closed in controller control；
Third extracts steel pipe out after pressure and stability of flow out of glowing furnace, is sent into steel pipe by Si Huidun feeder and rotates
Rack is opened water fender, is cooled down using the flow set to steel pipe；Meanwhile controller is by contact roller water replanishing device
The switch valve of inlet pipeline is opened, and controller opens the switch valve of the inlet pipeline of interior spray cooling device, is carried out to steel pipe outer
Portion is cooling and inside is cooling；
4th, in cooling procedure if there is flowed fluctuation, controller keeps cold flow control valve real-time perfoming closed-loop control
But flow in process is stablized；
5th, steel pipe is cooled to the switch valve and water fender that controller after temperature closes the inlet pipeline of contact roller water replanishing device, outside
Spray cooling water valve is kept it turned on, and outer spray cooling water flows into water return pipeline；The closing timing of interior spray cooling device switch valve,
According to the performance requirement of different steel pipes, it can shift to an earlier date or lag relative to outer spray cooling；Close water fender, interior spray cooling device switch
After valve and contact roller water replanishing device switch valve, steel pipe routs up water quenching rack；
6th, while glowing furnace extracts next steel pipe out, after water quenching rack is vacated, under same batch, Si Huidun feeder
Next steel pipe is sent into rotary stand, repeats above-mentioned cooling procedure third to the 5th step.
7th, all cooling water valves are closed after present lot steel pipe is cooling.
Cooling for steel pipe upset end end to end tiltedly sprays cooling device by steel pipe upset end and realizes that the moisturizing of upset end is cold
But；In the step 1, the steel pipe upset end for setting outer spray cooling device tiltedly sprays cooling device setting pressure and flow；The step
In rapid two, determine that the steel pipe upset end tiltedly sprays the lumen number that cooling device uses according to the length of steel pipe upset end, according to
The thickness of upset end determines that flow control valve is opened to corresponding with setting flow by the cooling pressure of moisturizing and flow, controller
Open position；The aperture and pressure of flow control valve therein and the relationship of flow tiltedly spray cooling device throwing in steel pipe upset end
It is demarcated first before entering use, determines that the corresponding flow of different opening, controller store it at various pressures.
When steel pipe carries out quenching modifier treatment, external cooling device is controlled using step's flux, i.e., when interior spray is side
Water inlet, external cooling device adjust each section of outer spray flow density, its overall length is made to form the cooling capacity point with interior spray opposite direction
Cloth.
External cooling device is flow continuously adjustable output, and according to steel pipe different wall thickness, steel grade technique requires and continuous cold
But change (CCT) characteristic, calculate the different water flows needed when given steel pipe cooling, required for controlling when steel pipe quenches
Different cooling rate.
The flux density control range is 150l/min/m2—2000l/min/m2。
The pressurization that the process units of steel pipe off-line quenching of the present invention uses flow and pressure adjustable to steel pipe tube body is multiple rows of
It is segmented direct-injection cooling device, while increasing segmentation tiltedly spray cooling device for upset end, has been used more in contact roller position
Effective water replanishing device, so that it is guaranteed that steel pipe overall length obtains consistent Quick uniform cooling effect.Steel pipe off-line quenching of the present invention
Production method use pressurization direct-injection, at upset end moisturizing and contact roller moisturizing the type of cooling, to steel pipe circumferential and axial
It is cooling to implement Quick uniform, meets the out-line quenching process requirements of different steel grade specification steel pipes, after quenching steel pipe
Overall length is straight and performance is uniform, reduces slewing loss, and greatly shorten bottleneck process -- the time of water quenching, to improve
Production efficiency reduces materials in the tube time inside furnace, reduces energy consumption, improves materials in the tube surface oxidation.
The process units and method of steel pipe off-line quenching of the present invention are able to satisfy different steel grades and specification tube product cold eventually
Tubular etc. technique requirement after temperature, cooling rate, pipe face temperature uniformity and cooling.
The present invention passes through the multiple rows of multistage direct-injection cooling device and method of water flow and pressure adjustable, realizes to seamless steel pipe
The Quick uniform of circumferential and axial is cooling, it is ensured that and overall length is straight after steel pipe quenching and performance is uniform, reduces slewing loss, and
The time required to greatly shortening tube body water cooling.By the cooling moisturizing of steel pipe upset end and to water replanishing device at contact roller and method, mention
High upset end cooling velocity reduces and weakens phenomenon because cooling caused by contact roller, it is ensured that steel pipe overall length cooling time is consistent and property
It can be uniformly.
Detailed description of the invention
Fig. 1 is heat-treatment production line arrangement schematic diagram；In Fig. 1: 1 walking beam furnace, 2 outer sprinklers, 21 electric adjustables
Save valve, 22 flowmeters, spraying equipment in 3,4 steel pipes, 5 rotating wheels, 6 step-by-step movement tempering furnaces；
Fig. 2 is the process units schematic diagram of steel pipe off-line of the present invention quenching；
Fig. 3 is the nozzle arrangement schematic diagram of direct-injection cooling device of the invention, in which: Fig. 3 (a) nozzle is double stagger arrangement row
Cloth, Fig. 3 (b) nozzle are three misarrangements column arrangement, and Fig. 3 (c) nozzle is four misarrangements column arrangement；
Fig. 4 is direct-injection cooling device structural schematic diagram of the invention；
Fig. 5 is oblique spray cooling device structural schematic diagram of the invention；
Fig. 6 is contact roller water replanishing device structural schematic diagram of the invention；
Fig. 7 is single spray box closed loop pipeline schematic diagram of the invention；
Fig. 8 is the overall length yield strength curve of cyclical fluctuations of embodiment 2.
In figure: 7 direct-injection cooling devices, 71 spray boxs, 72 nozzles, 73 inlet pipelines, 74 flowmeters, 75 regulating valves；8 tiltedly spray it is cold
But device (steel pipe upset end tiltedly sprays cooling device), 81 spray boxs, 82 nozzles, 83 inlet pipelines；9 contact roller water replanishing devices, 10 steel
Pipe, 11 water collectors (total collector of intaking).
Specific embodiment
The present invention will be further explained below with reference to the attached drawings and specific examples.
There are four master operations on steel pipe heat-treatment lines: quenching stove heating, water quenching, tempering stove heating, thermal straightening, therein
Water quenching process, which will generally use, to carry out the type of cooling drenched outside interior spray after steel pipe compression rotation, and China and foreign countries' shower device is generally using admittedly
Determine low pressure water drenching mode.As shown in Figure 1, in Fig. 1: 1 is walking beam furnace, and 2 be outer sprinkler, and 21 be electric control valve,
22 be flowmeter, and 3 be interior spraying equipment, and 4 be steel pipe, and 5 be rotating wheel, above there is contact roller, and 6 be step-by-step movement tempering furnace.
The pressurization that the process units of steel pipe off-line quenching of the present invention uses flow and pressure adjustable to steel pipe tube body is multiple rows of
It is segmented direct-injection cooling device 7, while increasing segmentation tiltedly spray cooling device 8 for upset end, has been used more in contact roller position
Add effective contact roller water replanishing device 9, so that it is guaranteed that steel pipe overall length obtains consistent Quick uniform cooling effect.
A kind of process units of steel pipe off-line quenching, including outer spray cooling device and interior spray cooling device, the cooling dress of interior spray
It sets and inner shaft stream spray cooling is implemented to the steel pipe of rotation；It is cold that outer spray cooling device implements outer spray pressurized jet to the steel pipe of rotation
But.The outer spray cooling device includes that direct-injection cooling device 7, steel pipe upset end tiltedly spray cooling device 8 and contact roller water replanishing device
9, referring to fig. 2.
The direct-injection cooling device 7 includes multiple spray boxs 71, and referring to Fig. 3 and Fig. 4, which is set to placing steel tubes 10
Rotary stand above, each 71 front end of spray box is provided with multiple rows of nozzle 72, and 72 front end of spray box is against following steel pipe, spray box 72
Rear end connects inlet pipeline 73, and flowmeter 74 and flow control valve 75 are housed on inlet pipeline 73, and flowmeter 74 and flow are adjusted
Valve 75 connects controller, and inlet pipeline 73 connects water collector 11, and water collector 11 is pressurizeed by variable frequency pump and supplied water, and variable frequency pump connects
Controller；The multiple spray box 71 is arranged in a column, faces 10 length direction of steel pipe for corresponding to lower section directly.
The nozzle 72 of the direct-injection cooling device 7 is multiple rows of stagger arrangement arrangement.The nozzle 72 of each 71 front end of spray box is even number
Row, even rows nozzle 72 are arranged symmetrically at the top of steel pipe 10；Even rows nozzle 72 is double rows of nozzles and four row's nozzles, each nozzle
72 stagger arrangement arrangement.The nozzle 72 of each 71 front end of spray box is odd row, and the row in odd row nozzle 72 is directed at 10 top of steel pipe,
Remaining row's nozzle is arranged symmetrically along top；Odd row nozzle 72 is single row of nozzles and three row's nozzles, three row's nozzle stagger arrangement arrangement.
The process units of steel pipe off-line quenching of the present invention, the outer direct-injection cooling device 7 for spraying cooling device is according to different pipes
The production outline demand of diameter and wall thickness, the multiple rows of nozzle of the pressurization of the direct-injection cooling device design discharge and pressure adjustable (1~
4 rows) and segmentation spray box (5~15 sections).It is arranged symmetrically when even rows nozzle along steel pipe top, wherein 1 row couple when odd row nozzle
Quasi- steel pipe top, remaining nozzle are arranged symmetrically along top.As shown in Figure 3.According to product specification, mainly diameter of steel tube, in Fig. 3
It is 50~150mm that the application range of three kinds of nozzle arrangement modes, which is respectively as follows: the corresponding diameter of steel tube range of Fig. 3 (a), and Fig. 3 (b) is right
The diameter of steel tube range answered is 100~200mm, and the corresponding diameter of steel tube range of Fig. 3 (c) is 150~500mm.
7 segment design of direct-injection cooling device, every section is a spray box 71, and multiple spray boxs are arranged in a column, correspond to
10 length direction of steel pipe of lower section.If the direct-injection cooling device is designed as single cabinet pattern, it is difficult to adjust overall length flow, it is difficult to
It is quenched suitable for overall length of interior spray axis stream when cooling, and single spray box is too long is difficult to process straight, not only difficult processing but also has been unfavorable for
Installation, maintenance, general spray box Design of length is at three meters or less.If direct-injection cooling device design is too short, large number of, although processing
It is easy, but needs matched valve group also more, greatly increase manufacturing cost, installation calibrating is time-consuming and laborious, also comparatively laborious in control.
Meanwhile to meet the heat treatment requirements of thick head thickness tail drilling pipe etc., it is necessary to which according to the tube product thickness, Design of length is adjustable end to end
The corresponding spray box length of water flow and pressure.Therefore, position of the direct-injection cooling device generally according to contact roller on rotary stand
With thick length end to end, it is designed as the combination of multistage (5~15 sections) spray box.Flow adjusting is provided on each 71 inlet pipeline 73 of spray box
Valve 75 and flowmeter 74 can carry out closed-loop control according to setting flow and measured discharge, it is ensured that actual flow referring to fig. 4
Precisely, to meet the needs of uniformly cooling down under different steel grade specification size cooling rates.Inlet pipeline 73 connects water collector 11,
Water collector is pressurizeed by variable frequency pump and is supplied water, and variable frequency pump connects controller, controls pressure of supply water by variable frequency pump.Direct-injection is cooling
Device pressure of supply water range is 0.1~0.5MPa, maximum amount of water 4000m3/h。
Due to the barrier of contact roller, water spray is difficult to pour steel tube surface outside steel pipe 10, therefore devises at contact roller
Contact roller water replanishing device 9 is cooled down.Referring to Fig. 6, the contact roller water replanishing device 9 includes multiple nozzles, multiple nozzle connections
Inlet pipeline, nozzle are located at below contact roller, and nozzle is from the bottom up against steel pipe water-spraying control.
For the heat treatment requirements for meeting thick head thickness tail drilling pipe etc., outer spray cooling device further comprise steel pipe upset end tiltedly spray it is cold
But device 8.Referring to figs. 5 and 6, it includes spray box 81 that the steel pipe upset end, which tiltedly sprays cooling device 8, which is set to placement
The rotary stand upper side of steel pipe 10,81 front end of spray box are provided with multiple rows of nozzle 82, and 81 front end of spray box is against following steel pipe 10
Head or tail portion, include multiple inner cavities in spray box 81, and each inner cavity is provided with water inlet connection inlet pipeline 83, on inlet pipeline 83
Equipped with flowmeter and flow control valve, flowmeter connects controller with flow control valve；Inlet pipeline 83 connects water inlet collector, water inlet
Collector is pressurizeed by variable frequency pump and is supplied water, and variable frequency pump connects controller.Tiltedly water inlet collector and direct-injection that spray cooling device 8 is connected
The water collector 11 that cooling device 7 is connected, the two can be identical water inlet pipe, be also possible to different water inlet pipes.The spray
Case 81 has an angle against steel pipe partially along the vertical center line of steel tube section, i.e., tiltedly sprays the spray box 81 and direct-injection of cooling device 8
There is an angle between the spray box 71 of cooling device 7.If the spray box 71 of direct-injection cooling device directly corresponds to steel pipe 10, tiltedly spray
The spray box 81 of cooling device turns over that an angle is oblique to correspond to steel pipe 10, is staggered with the spray box 71 of direct-injection cooling device.Direct-injection
Cooling water is complementary with side spray cooling water, and non-interference, to improve the cooling rate of upset end, shortens steel pipe integral quenching
Time, while keeping the performance of upset end consistent with tube body.
Referring to figs. 5 and 6, the cavity length is according to the transition section length L of steel pipe thick sectiongWith upset end length LjIf
It sets；Having inner cavity in spray box 81 is 1 to 6.The nozzle 82 of 81 front end of spray box is multiple rows of stagger arrangement arrangement, and nozzle is 1 to 6 row.
81 both ends of spray box are provided with mounting plate, for being installed on bracket.
The spray box 81 is separately positioned on the head and tail portion both ends in steel pipe direction, is symmetrically arranged, and adds to steel pipe 10
It is cooling that thick end carries out moisturizing.Spray box 81 is there are two one end of steel pipe head or tail portion, along the vertical center line pair of steel tube section
Claim setting.If the upset end thickness in product mix is little, with single-sided arrangement or unilateral water-spraying control can also be arranged symmetrically.
Steel pipe upset end moisturizing cooling device of the invention be on the basis of the external cooling device of Uniting, according to
The production outline demand of different tube diameters and wall thickness, multiple rows of (1~6 row) the stagger arrangement arrangement of the pressurization of design discharge and pressure adjustable
The oblique spray cooling device 8 of nozzle, 81 cabinet of spray box is divided into multiple (1~6) inner cavities according to upset end length specification, and designs
Independent water inlet connection inlet pipeline 83 and flowmeter and flow control valve, as shown in Figure 5.Inlet pipeline connection water inlet collection
Pipe, water inlet collector are pressurizeed by variable frequency pump and are supplied water, and variable frequency pump connects controller, control pressure of supply water by variable frequency pump,
Pressure of supply water range is 0.1~0.5MPa.Each cavity length is according to transition section length LgThe different upset end in product specification
Length LjIt is designed.
The 71 closed loop pipeline of single spray box and steel pipe upset end of the direct-injection cooling device 7 of the outer spray cooling device tiltedly spray cold
But the 81 closed loop pipeline structure of single spray box of device 8 is identical, referring to Fig. 7.With the 71 closed loop pipe of single spray box of direct-injection cooling device 7
It is illustrated for road, 71 rear end of spray box connects inlet pipeline 73, adjusts on inlet pipeline 73 equipped with flowmeter 74 and flow
Valve 75, flowmeter 74 and flow control valve 75 connect controller, the water inlet pipe of the inlet pipeline 73 as spray box 71, water inlet pipe
Road 73 reconnects water collector 11, and water collector 11 is pressurizeed by variable frequency pump and supplied water as total collector of intaking, water collector 11, frequency conversion water
Pump connects controller, and controller controls water pump to adjust water feeding pressure.It is outer spray cooling device pressure of supply water range be 0.1~
0.5MPa.Controller is in advance adjusted flow according to the setting flow of water inlet pipe according to the aperture of calibration and the relationship of flow
Valve is opened to the corresponding aperture of setting flow.The deviation of actual flow and setting flow that controller is obtained according to flow measurement,
Dynamic adjusts the aperture of flow control valve, makes actual flow and sets the deviation of flow in allowed limits.
Since steel pipe upset end water replanishing device is to carry out moisturizing cooling, flow demand on the basis of direct-injection cooling device
Small, easily controllable and adjusting reduces valve group loss, is that one kind is very economical efficiently in the non-thickened steel-tube of cooling without opening
Cooling device.
A kind of production method of steel pipe off-line quenching, the steps include:
First, before steel pipe quenching production starts, corresponding pressure and flow are set according to the steel grade of steel pipe and specification, including interior
Portion is cooling and outside is cooling, and internal cooling is that interior spray cooling device implements inner shaft to the steel pipe of rotation with given pressure and flow
Spray cooling is flowed, external cooling is that outer spray cooling device is cooling to the outer spray pressurized jet of steel pipe implementation of rotation.
For general steel pipe, the direct-injection cooling device 7 of outer spray cooling device sets pressure and flow, contact roller moisturizing dress
9 are set with given pressure and flow spray cooling；
Cooling for steel pipe upset end end to end tiltedly sprays cooling device 8 by steel pipe upset end and realizes that the moisturizing of upset end is cooling,
The steel pipe upset end of the outer spray cooling device of setting tiltedly sprays cooling device 8 and sets pressure and flow.
Second, after first steel pipe is heated to temperature, according to the pressure and flow of setting, controller is by direct-injection cooling device
7 flow control valve 75 is opened to corresponding aperture, opens the switch valve of inlet pipeline, further according to practical stream after pressure is stablized
Amount fine tuning flow control valve 75, flow is adjusted to tolerance permitted range；The aperture of flow control valve 75 therein and pressure and
The relationship of flow is demarcated first before direct-injection cooling device 7 comes into operation, and determines different opening pair at various pressures
The flow answered, controller store it；
Cooling for steel pipe upset end end to end determines that the steel pipe upset end tiltedly sprays cooling dress according to the length of steel pipe upset end
8 lumen numbers used are set, the cooling pressure of moisturizing and flow are determined according to the thickness of upset end, controller is by flow control valve
It is opened to open position corresponding with setting flow；The aperture and pressure of flow control valve therein and the relationship of flow are in steel
Pipe upset end tiltedly sprays before cooling device comes into operation to be demarcated first, determines the corresponding stream of different opening at various pressures
Amount, controller store it.
Water fender is closed in controller control.
Third extracts steel pipe out after pressure and stability of flow out of glowing furnace, is sent into steel pipe by Si Huidun feeder
Rotary stand is opened water fender, is cooled down using the flow set to steel pipe；Meanwhile controller fills contact roller moisturizing
Set 9 inlet pipeline switch valve open, controller by it is interior spray cooling device inlet pipeline switch valve open, to steel pipe into
The external cooling of row and inside are cooling.The unlatching timing of interior spray cooling device, according to the performance requirement of different steel pipes, relative to outer spray
Cooling can in advance or lag, and can set it is different in advance or lag time.
4th, in cooling procedure if there is flowed fluctuation, controller protects flow control valve real-time perfoming closed-loop control
Hold stability of flow in cooling procedure；Controller includes the direct-injection cooling device of outer spray cooling device to the control of flow control valve
7 spray cooling device 8 with oblique.
5th, steel pipe is cooled to the switch valve and water blocking that controller after temperature closes the inlet pipeline of contact roller water replanishing device
Plate, outer spray cooling water valve are kept it turned on, and outer spray cooling water flows into water return pipeline；The closing of interior spray cooling device switch valve
Timing, according to the performance requirement of different steel pipes, relative to outer spray cooling can in advance or lag, and can set it is different in advance or
Lag time.After closing water fender, interior spray cooling device switch valve and contact roller water replanishing device switch valve, steel pipe routs up water quenching platform
Frame.
6th, while glowing furnace extracts next steel pipe out, after water quenching rack is vacated, under same batch, on Si Huidun
Next steel pipe is sent into rotary stand by material machine, repeats above-mentioned cooling procedure third to the 5th step.
7th, all cooling water valves are closed after present lot steel pipe is cooling.
If there is subsequent batches steel pipe to need to cool down, repeated according to the pressure of the steel pipe of next batch setting and flow above-mentioned
Cooling procedure.
According to the caliber pressure different with the different set of wall thickness and flow, the steel pipe implementation inner shaft stream of rotation is sprayed,
The methods for cooling of outer spray pressurized jet.The production method of steel pipe off-line quenching of the invention mainly uses external cooling device
Following two control strategy.
Step's flux control strategy: when steel pipe carries out quenching modifier treatment, since interior spray is that side intakes, steel pipe head
Interior cold effect be greater than outer cold effect, for the consistency for guaranteeing steel pipe axial temperature, external cooling device is adjusted and is sprayed water outside each section
Flux density forms its overall length and is distributed with the cooling capacity of interior spray opposite direction, to obtain the one of steel pipe overall length temperature gradient
Cause property, it is ensured that steel pipe overall length intensity it is consistent.
Flow continuously adjustable output strategy: according to steel pipe different wall thickness, steel grade technique requires and continuous cooling transformation (CCT)
Characteristic calculates the different water flows needed when given steel pipe cooling, so that required difference when controlling steel pipe quenching is cooling
Rate.Flux density control range is wide and stablizes, can be from 150l/min/m2—2000l/min/m2, realize the cooling of different steel pipes
Process requirements.
The production method of steel pipe off-line quenching of the present invention is to be increased stepwise control strategy by using outer jet flow amount, realizes steel
Pipe rapidly and uniformly quenches, it is ensured that overall length is straight after steel pipe quenching and performance is uniform, reduces slewing loss, and contract significantly
The time required to short water cooling, to improve production efficiency, materials in the tube time inside furnace is reduced, reduces energy consumption, improves materials in the tube surface oxidation.
The production method of steel pipe off-line quenching of the present invention is able to achieve when drenching outside interior spray and is increased stepwise by using control strategy
The quenching of small flow and the pressurization moisturizing of upset end steel pipe of flow quenching, small diameter tube or thin-wall steel tube, and monitor cooled
The fluctuation of hydraulic pressure and flow in journey realizes the uniform and stable automated closed-loop control of quenching process, it is ensured that cooling procedure middle tube body is complete
The stabilization of long pressure and flow, to achieve the purpose that uniformly cooling.
Embodiment
1) the direct-injection cooling device for spraying cooling device outside is designed as the nozzle that two rows of stagger arrangement are distributed and adopts as shown in Fig. 3 (a)
Use cylindrical spout.
2) direct-injection cooling device spray box length, respectively 630mm, 1800mm, 1800mm, 1800mm from interior spray side,
1650mm, 1940mm, 1970mm, 1800mm, overall length 13390mm.
3) the oblique spray cooling device (upset end water replanishing device) for spraying cooling device outside is designed as the nozzle of three misarrangement column distributions,
Divide three sections, as shown in figure 5, using cylindrical spout.
4) upset end moisturizing spray box Design of length is 1500mm, is divided into three sections of each 500mm.
Embodiment 1:
Carrying out the quenched quenching of spray, outer diameter 168.3mm, wall thickness in outer drench with line pipe to the ocean military service of X65QO grade of steel is
15mm, setup parameter are as follows:
Revolving speed: 90rpm
Interior jet flow amount: 418m3/h
Sprays outward power: 0.2MPa
Outer spray total flow: 1399m3/h
1 each section of spray box flow flux density of table and flow
| Spray box number | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 |
| Length, m | 0.63 | 1.8 | 1.8 | 1.8 | 1.65 | 1.94 | 1.97 | 1.8 |
| Water, m3/h | 61.31 | 177.85 | 181.21 | 184.03 | 173.01 | 206.60 | 213.48 | 201.24 |
| Jet density, m3/h/m | 97.31 | 98.81 | 100.67 | 102.24 | 104.85 | 106.50 | 108.36 | 111.80 |
Steel pipe overall length performance after table 2 quenches
| Maximum yield strength MPa | Minimum yield strength MPa | Yield strength fluctuates MPa | The maximum tensile strength MPa | Minimum tensile strength MPa | Tensile strength fluctuates MPa |
| 505 | 495 | 10 | 582 | 572 | 10 |
From Table 2, it can be seen that using the process units and method of steel pipe off-line of the present invention quenching, the surrender of quenched rear line pipe
Intensity and tensile strength fluctuation significantly reduce.
Embodiment 2:
Carrying out the quenched quenching of spray, outer diameter 88.9mm, tube body wall thickness in outer leaching to C110 steel pipe is 6.45mm, and upset end wall thickness is
15mm, length 900mm, setup parameter are as follows:
Revolving speed: 90rpm,
Interior jet flow amount: 418m3/ h,
Sprays outward power: 0.2MPa,
Outer spray total flow: 1500m3/ h,
Upset end water replanishing device opens two sections, length 1000mm,
Upset end supplementing water pressure: 0.3MPa,
Upset end moisturizing total flow: 50m3/h 。
It can from the overall length yield strength curve of cyclical fluctuations (the C110 88.9*6.45 overall length yield strength curve of cyclical fluctuations) of Fig. 8
To find out, using upset end moisturizing cooling device of the invention and method, the yield strength of quenched rear steel pipe upset end and tube body
With tensile strength difference very little.Also, the water cooling time shortens to 9S hereinafter, extra strong pipe beat can promote 2S, improved efficiency from 11S
About 10%.
The above is merely preferred embodiments of the present invention, it is not intended to limit the protection scope of invention, it is therefore, all at this
Any modification, equivalent replacement, improvement and so within the spirit and principle of invention, should be included in protection scope of the present invention
Within.
Claims (11)
1. a kind of process units of steel pipe off-line quenching, including outer spray cooling device and interior spray cooling device, interior spray cooling device
Inner shaft stream spray cooling is implemented to the steel pipe of rotation；
It is characterized in that: the outer spray cooling device implements outer spray pressurized jet cooling, outer spray cooling device packet to the steel pipe of rotation
It includes direct-injection cooling device and steel pipe upset end tiltedly sprays cooling device；
The direct-injection cooling device includes multiple spray boxs, which is set to above the rotary stand of placing steel tubes, each spray box
Front end is provided with multiple rows of nozzle, and against following steel pipe, spray box rear end connects inlet pipeline for spray box front end, is equipped on inlet pipeline
Flowmeter and flow control valve, flowmeter and flow control valve connect controller, inlet pipeline water receiving collector, and water collector passes through change
The pressurization of frequency water pump is supplied water, and variable frequency pump connects controller；The multiple spray box is arranged in a column, and the steel pipe faced directly below corresponding to is long
Spend direction；
It includes spray box that the steel pipe upset end, which tiltedly sprays cooling device, which is set to the rotary stand upper side of placing steel tubes,
Spray box front end is provided with multiple rows of nozzle, and spray box front end is against following steel pipe head or tail portion, and interior spray box includes multiple inner cavities, often
A inner cavity is connected with inlet pipeline, flowmeter and flow control valve is housed on inlet pipeline, flowmeter is connected with flow control valve
Controller, inlet pipeline connect water inlet collector, and water inlet collector is pressurizeed by variable frequency pump and supplied water, and variable frequency pump connects controller；It is described
Spray box has an angle against steel pipe partially along the vertical center line of steel tube section, i.e., tiltedly the spray box of spray cooling device and direct-injection are cooling
There is an angle between the spray box of device.
2. the process units of steel pipe off-line quenching according to claim 1, it is characterized in that: the outer spray cooling device also wraps
Contact roller water replanishing device is included, contact roller water replanishing device includes multiple nozzles, and multiple nozzles connect inlet pipeline, and nozzle, which is located at, to be compressed
Wheel lower section, nozzle is from the bottom up against steel pipe water-spraying control.
3. the process units of steel pipe off-line quenching according to claim 1 or 2, it is characterized in that: the direct-injection cooling device
Nozzle be multiple rows of stagger arrangement arrangement.
4. the process units of steel pipe off-line quenching according to claim 1 or 2, it is characterized in that: the oblique spray cooling device
Nozzle be multiple rows of stagger arrangement arrangement.
5. the process units of steel pipe off-line quenching according to claim 1 or 2, it is characterized in that: the oblique spray cooling device
Spray box cavity length according to the transition section length L of steel pipe thick sectiongWith upset end length LjSetting.
6. the process units of steel pipe off-line quenching according to claim 1 or 2, it is characterized in that: the oblique spray cooling device
Spray box there are two one end of steel pipe head or tail portion, the vertical center line along steel tube section is symmetrical arranged.
7. a kind of production method of steel pipe off-line quenching, it is characterized in that:
First, before steel pipe quenching production starts, corresponding pressure and flow are set according to the steel grade of steel pipe and specification, including interior
Portion is cooling and outside is cooling, and internal cooling is that interior spray cooling device implements inner shaft to the steel pipe of rotation with given pressure and flow
Spray cooling is flowed, external cooling is that outer spray cooling device is cooling to the outer spray pressurized jet of steel pipe implementation of rotation, and outer spray is cooling to be filled
The direct-injection cooling device setting pressure and flow set, contact roller water replanishing device is with given pressure and flow spray cooling；
Second, after first steel pipe is heated to temperature, according to the pressure and flow of setting, controller is by the stream of direct-injection cooling device
Adjustable valve is opened to corresponding aperture, opens the switch valve of inlet pipeline, finely tunes after pressure is stablized further according to actual flow
Flow control valve adjusts flow to tolerance permitted range；The aperture of flow control valve therein and the relationship of pressure and flow
It is demarcated first before direct-injection cooling device comes into operation, determines the corresponding flow of different opening at various pressures, control
Device processed stores it；Water fender is closed in controller control；
Third extracts steel pipe out after pressure and stability of flow out of glowing furnace, is sent into steel pipe by Si Huidun feeder and rotates
Rack is opened water fender, is cooled down using the flow set to steel pipe；Meanwhile controller is by contact roller water replanishing device
The switch valve of inlet pipeline is opened, and controller opens the switch valve of the inlet pipeline of interior spray cooling device, is carried out to steel pipe outer
Portion is cooling and inside is cooling；
4th, in cooling procedure if there is flowed fluctuation, controller keeps cold flow control valve real-time perfoming closed-loop control
But flow in process is stablized；
5th, steel pipe is cooled to the switch valve and water fender that controller after temperature closes the inlet pipeline of contact roller water replanishing device, outside
Spray cooling water valve is kept it turned on, and outer spray cooling water flows into water return pipeline；The closing timing of interior spray cooling device switch valve,
According to the performance requirement of different steel pipes, it can shift to an earlier date or lag relative to outer spray cooling；Close water fender, interior spray cooling device switch
After valve and contact roller water replanishing device switch valve, steel pipe routs up water quenching rack；
6th, while glowing furnace extracts next steel pipe out, after water quenching rack is vacated, under same batch, Si Huidun feeder
Next steel pipe is sent into rotary stand, repeats above-mentioned cooling procedure third to the 5th step.
7th, all cooling water valves are closed after present lot steel pipe is cooling.
8. the production method of steel pipe off-line according to claim 7 quenching, it is characterized in that: for steel pipe upset end end to end
It is cooling, cooling device is tiltedly sprayed by steel pipe upset end and realizes that the moisturizing of upset end is cooling；In the step 1, outer spray cooling is set
The steel pipe upset end of device tiltedly sprays cooling device setting pressure and flow；In the step 2, according to the length of steel pipe upset end
It determines that the steel pipe upset end tiltedly sprays the lumen number that cooling device uses, the cooling pressure of moisturizing is determined according to the thickness of upset end
Flow control valve is opened to open position corresponding with setting flow by power and flow, controller；Flow control valve therein
Aperture tiltedly spray before cooling device comes into operation with pressure and the relationship of flow in steel pipe upset end and demarcated first, determine
The corresponding flow of different opening, controller store it at various pressures.
9. the production method of steel pipe off-line quenching according to claim 7 or 8, it is characterized in that: when steel pipe carries out quenching tune
When matter processing, external cooling device is controlled using step's flux, i.e., when interior spray is that side intakes, external cooling device adjusts each section
Outer spray flow density forms its overall length and is distributed with the cooling capacity of interior spray opposite direction.
10. the production method of steel pipe off-line quenching according to claim 7 or 8, it is characterized in that: external cooling device is stream
Continuously adjustable output is measured, according to steel pipe different wall thickness, steel grade technique requires and continuous cooling transformation (CCT) characteristic, calculates given
The different water flows that steel pipe needs when cooling, to control required different cooling rate when steel pipe quenching.
11. the production method of steel pipe off-line quenching according to claim 10, it is characterized in that: the flux density controls model
It encloses for 150l/min/m2—2000l/min/m2。
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110699523A (en) * | 2019-10-24 | 2020-01-17 | 马鞍山楚锐科技信息咨询有限公司 | Pipe fitting quenching barrel |
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