CN102876875B - Method for performing full annealing heat treatment for alloy steel pipe - Google Patents
Method for performing full annealing heat treatment for alloy steel pipe Download PDFInfo
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- CN102876875B CN102876875B CN201210372510.2A CN201210372510A CN102876875B CN 102876875 B CN102876875 B CN 102876875B CN 201210372510 A CN201210372510 A CN 201210372510A CN 102876875 B CN102876875 B CN 102876875B
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Abstract
The invention provides a method for performing full annealing heat treatment for an alloy steel pipe. A stepping continuous quenching and tempering furnace is used for sequentially performing first-order annealing treatment and second-order annealing treatment for the pipe to be treated, and comprises a quenching furnace and a tempering furnace which are sequentially arranged. The first-order annealing treatment includes the steps: feeding the quenching furnace and heating up a preheating section and a first heating section of the quenching furnace; keeping the temperature of a second heating section of the quenching furnace; and cooling a soaking section of the quenching furnace. The second-order annealing treatment includes the steps: discharging the quenching furnace, emptying a quenching device and rapidly feeding the tempering furnace; keeping the temperature of a preheating section and a front half of a first heating section of the tempering furnace and heating up the preheating section and the front half of a first heating section of the tempering furnace; keeping the temperature of a rear half of the first heating section and a second heating section of the tempering furnace; and cooling a soaking section of the tempering furnace, tapping and air cooling. The stepping continuous quenching and tempering furnace is used for performing full annealing heat treatment for the pipe, and technological requirements are met by a continuous efficient heat treatment mode.
Description
Technical field
The present invention relates to the production field of alloy steel pipe, more particularly, relate to a kind of employing stepped start-stop system tempering stove alloy steel pipe of quenching continuously and carry out Full Annealing heat-treating methods.
Background technology
For guaranteeing that alloy steel pipe obtains lower hardness number, generally need to adopt Full Annealing thermal treatment process.Traditional Full Annealing thermal treatment process is that steel alloy tubing is heated to above 30～50 ℃ and be incubated for some time of austenitic temperature, after abundant austenitizing, with the air cooling of coming out of the stove after speed of cooling (being generally furnace cooling) is cooled to 550 ℃ slowly, can guarantee that it meets compared with the requirement of soft index again.The essence of above-mentioned thermal treatment process is: at austenite, in the process of ferritic transformation, provide speed of cooling very slowly, conventionally can only in car bottom furnace or batch-type furnace, take furnace cooling mode to realize this thermal treatment process.What the tempering stove heat-treatment lines of quenching continuously carried out conventionally is modifier treatment or positive temper, does not possess the condition of realization " furnace cooling ", so be generally unsuitable for carrying out Full Annealing thermal treatment.
Car bottom furnace is a kind of periodic heat treatment furnace, and its thermal treatment material platform, on a dolly that can pass in and out stove, has the fire-resistant pouring material of thicker load-bearing to play the effect that insulation and protection furnace bottom dolly machinery are avoided temperatures involved on dolly.Get ready after material, thermal treatment tubing enters together stove with whole trolley body and heat-treats.Because its heat insulation effect is relatively poor, applicable annealing or Full Annealing processing, can control the cold cooling rate of stove easily.But due to the impact of chassis face, material frame and the overlapping stacking of tubing, heating-up time and samming are chronic in Full Annealing treating processes, the processing energy consumption of ton pipe is high.
Batch-type furnace is also a kind of periodic heat treatment furnace.Batch-type furnace is to get ready after thermal treatment tubing with heat-resisting material frame, with dress reclaimer, material frame is sent in stove and is heat-treated together with tubing, the air cooling if dead annealed tubing is come out of the stove after making it with stove cooling.Because its heat insulation effect is better, for Full Annealing tubing, 700 ℃ of following low-temperature zone cooling rates are very slow, and heat treatment cycle is very long; Add heat-resisting material framework long-pending larger, in thermal treatment, need it to heat together, heat up longer with the samming time.
The continous way tempering stove of quenching mainly contains walking beam furnace and induction furnace.Medium frequency electric induction process furnace is the emerging type of furnace, and equipment is simple, but soaking time is difficult to control, can only the single modified pipe of processing requirements.And the walking beam furnace heat treated conventional type of furnace that is tubing, tubing is longitudinally sent in stove by rollgang, by the heat-resisting girder steel of activity in stove, coordinate with fixing heat-resistant girder steel, by the stepping period of setting, move laterally, often move and move a step, tubing rolls on slope and produces slightly rotation in fixed beam tooth, reaches the progressively object of turn-over; Tubing, in the process of transverse shifting, in heating zone intensification, the insulation of soaking zone samming, is finally longitudinally come out of the stove cooling by furnace rolls road gradually.The quench tempering stove overwhelming majority of current continous way both domestic and external adopts walking beam furnaces, and in heat treatment process, heat-resisting stepping steel beam structure in stove, does not have additional supplementary unit to need heating all the time, and energy consumption is less.
Conventional 1Cr5Mo, 1Cr9Mo alloy steel seamless steel tube in cracking of oil device, because of its working conditions requirement, the hardness of steel pipe must be less than 187HB, 179HB or 163HB (different and different with standard), also needs to meet certain tensile strength and impelling strength index simultaneously.General this class steel pipe of production adopts Full Annealing thermal treatment process and is mainly to carry out at batch-type furnace, although can guarantee quality product requirement, production efficiency is low, energy consumption is high, and is only applicable to small serial production, especially thin-walled tube is limited by shove charge, and efficiency is lower.
When running into, need to carry out the steel pipe's production of Full Annealing technique in batches large, and be subject to batch-type furnace limited processing ability and cannot realize and in enormous quantities producing continuously, while even having a strong impact on the problem at life cycle of the product and delivery date, how to utilize existing stepped start-stop system efficient, the energy-conservation production advantage of tempering stove of quenching, realize the Full Annealing thermal treatment of the alloy steel seamless steel tube high-efficiency and continuous such as 1Cr5Mo, 1Cr9Mo, to bringing into play the advantage of scale, reducing production costs, be significant.
Summary of the invention
For the deficiencies in the prior art, one of object of the present invention is to solve the one or more problems that exist in above-mentioned prior art.
The object of the present invention is to provide and a kind ofly can overcome the restriction of equipment for Heating Processing and realize quantity-produced more in enormous quantities and utilize the stepped start-stop system tempering stove alloy steel pipe of quenching continuously to carry out Full Annealing heat-treating methods.
To achieve these goals, the invention provides a kind of alloy steel pipe and carry out Full Annealing heat-treating methods, described method adopts the stepped start-stop system tempering stove of quenching continuously sequentially to carry out single order anneal and second order anneal to pending materials in the tube, described stepped start-stop system quenching furnance and the tempering stove that tempering stove comprises that order arranges of quenching continuously, wherein, described single order anneal comprises the steps: quenching furnance charging, one section of the preheating section of quenching furnance, heating, heats up; Two sections of the heating of quenching furnance, be incubated; Soaking zone at quenching furnance carries out the cold cooling of stove; Described second order anneal comprises the steps: quenching furnance discharging, and the empty quenching device of crossing also carries out tempering stove charging fast; Preheating section, one section of first half section of heating at tempering stove are incubated, heat up; Two periods of the heating of tempering stove one period of second half sections, heating, be incubated; Soaking zone at tempering stove carries out the cold cooling of stove, the air cooling of coming out of the stove.
Alloy steel pipe according to the present invention carries out an embodiment of Full Annealing heat-treating methods, before described single order anneal, sends into pending materials in the tube after sending into the many materials in the tube of taking the lead in quenching furnance again.
Alloy steel pipe according to the present invention carries out an embodiment of Full Annealing heat-treating methods, before described second order anneal, toward sending into many in tempering stove, scoop out materials in the tube, described in making, scoop out the middle part that materials in the tube advance at a quick pace one section of the heating of tempering stove, heat up, be incubated and preheating section that rewind down turns back to tempering stove scoops out the pending materials in the tube that will enter tempering stove from quenching furnance is come out of the stove.
Alloy steel pipe according to the present invention carries out an embodiment of Full Annealing heat-treating methods, controls the process time that pending materials in the tube finish to tempering stove charging from quenching furnance discharging and is no more than 3 minutes.
Alloy steel pipe according to the present invention carries out an embodiment of Full Annealing heat-treating methods, uses the stepping machine for moving steel of quenching device that the pending materials in the tube from quenching furnance discharging are transferred to tempering stove.
Alloy steel pipe according to the present invention carries out an embodiment of Full Annealing heat-treating methods, and one section of temperature of heating of controlling quenching furnance is the A higher than steel grade
c30～80 ℃ of temperature, two sections of temperature of heating are the A higher than steel grade
c350～80 ℃ of temperature, soaking zone temperature are the A lower than steel grade
c320～70 ℃ of temperature; One section of temperature of heating of controlling tempering stove is the A lower than steel grade
c120～50 ℃ of temperature, two sections of temperature of heating are the A lower than steel grade
c130～50 ℃ of temperature, soaking zone are the A lower than steel grade
c1100～150 ℃ of temperature.
Alloy steel pipe according to the present invention carries out an embodiment of Full Annealing heat-treating methods, and the stepping period that described pending materials in the tube are quenched in tempering stove continuously in stepped start-stop system is 150～600s.
The present invention completes by the desired furnace cooling process of Full Annealing thermal treatment being decomposed dexterously to stepped start-stop system two steps in the quenching furnance of tempering stove and tempering stove of quenching continuously, i.e. two rank continuous annealings, thus with the heat treatment mode of continuous high-efficient, reach the requirement of Full Annealing thermal treatment process.And, the present invention will be used for the modified heat-treatment lines of tubing originally---and stepped start-stop system is quenched tempering stove continuously for carrying out in enormous quantities the Full Annealing thermal treatment of tubing continuous high-efficient, and adjusting process parameter is controlled the performance index of tubing flexibly, the thermal treatment function that has creatively increased modified heat-treatment lines, has improved equipment efficiency of usage.
Accompanying drawing explanation
Fig. 1 is 500 times of metallographic structure figure of Φ that example of the present invention obtains 219.1mm * 10mm specification product.
Fig. 2 is 500 times of metallographic structure figure of Φ that example of the present invention obtains 193.7mm * 10mm specification product.
Embodiment
Hereinafter, detailed description alloy steel pipe of the present invention is carried out to Full Annealing heat-treating methods.
Quench the continuously general modified heat treatment step of tempering stove of stepped start-stop system is: tubing is translated into entering furnace roller road of quenching furnance automatically from feeding platform, that receives stove will expect oven door opening after signal, roller-way starting is toward the interior feeding of stove, tubing enters in stove and closes by fire door after automatic detection and location, walking beam starting, tubing is moved on to fixed beam to first heating station (also referred to as tooth from furnace rolls road top rail, below all be called tooth), after waiting for one-period, again tubing is shifted to next tooth, tubing is in batches being arranged team step by step to reach like this, in stove, press preheating section, furnace temperature is controlled in heating zone and soaking zone segmentation, tubing is through the intensification of heating zone, after the samming of soaking zone and insulation, tubing possesses the condition of coming out of the stove, at quenching device, possess quenching, provide and will expect signal, quenching furnance itself possesses again in the situation of discharging condition, oven door opening, and furnace delivery table starting, red pipe is sent quenching furnance, delivers to quenching device and quenches, quenched after fire, tubing is by traversing the entering on furnace roller road of tempering stove of delivering to of the stepped start-stop system machine for moving steel of quenching device, receive tempering stove to expect signal after tempering stove fire door open, enter the starting of furnace roller road and tubing is sent into tempering stove, tubing enters in stove and closes by fire door after automatic detection and location, the same with quenching furnance, by coordinating of walking beam and fixed beam, it is traversing forward step by step that tubing in batches is just being arranged team, tubing is through the intensification of heating zone, after the samming of soaking zone and insulation, tubing possesses the condition of coming out of the stove.So stepped start-stop system is quenched continuously, and tempering stove is applicable to be produced in enormous quantities, the especially production of thin-walled tube, stepping period is short, highly efficient in productivity, and energy consumption is low.
In addition, when tubing is heat-treated due to batch-type furnace, tubing is stacking, heats up and all can produce larger thermal stresses with cooling, and meeting is because of stacking gravity and thermal stresses is former thereby make tubing produce larger ovality and sinuousness; And in stepped start-stop system, quench continuously in tempering stove, tubing is discharge regularly of one, a tooth or two teeth, and every movement one tooth all can stir an angle, homogeneous heating and not variable recessed, become curved.Therefore, ovality and the sinuousness of the tubing that tempering stove processes that uses stepped start-stop system to quench continuously should be able to be better.
Consider the above-mentioned benefit that stepped start-stop system is quenched tempering stove continuously, the present invention is intended to utilize this equipment to carry out the Full Annealing thermal treatment of alloy steel pipe, to meet the requirement of efficient processing.In general, quenching furnance has 48～65 teeth, and heating and holding temperature are relatively high; Tempering stove generally has 78～100 teeth, and heating and holding temperature are relatively low; If both are worked in coordination, two stoves have 5～6 temperature control sections, if make full use of the temperature control capacity of each section, can realize Full Annealing thermal treatment process continuously completely.
Alloy steel pipe according to the present invention carries out Full Annealing heat-treating methods, described method adopts the stepped start-stop system tempering stove of quenching continuously sequentially to carry out single order anneal and second order anneal to pending materials in the tube, described stepped start-stop system quenching furnance and the tempering stove that tempering stove comprises that order arranges of quenching continuously, wherein, single order anneal comprises the steps: quenching furnance charging, one section of the preheating section of quenching furnance, heating, heats up; Two sections of the heating of quenching furnance, be incubated; Soaking zone at quenching furnance carries out the cold cooling of stove; Second order anneal comprises the steps: quenching furnance discharging, and the empty quenching device of crossing also carries out tempering stove charging fast; Preheating section, one section of first half section of heating at tempering stove are incubated, heat up; Two periods of the heating of tempering stove one period of second half sections, heating, be incubated; Soaking zone at tempering stove carries out the cold cooling of stove, the air cooling of coming out of the stove.
Above-mentioned steps is actually and the desired furnace cooling process of Full Annealing thermal treatment is decomposed to stepped start-stop system two steps in the quenching furnance of tempering stove and tempering stove of quenching continuously dexterously completes, by controlling the temperature of quenching furnance and tempering stove, control the actual treatment temp of the every one-phase of pending materials in the tube, thereby efficient, the continuous Full Annealing thermal treatment that realizes pending materials in the tube, wherein, the temperature of quenching furnance, each section of tempering stove can specifically arrange according to actual heat treating regime.Because quench the continuously temperature control section of quenching furnance of tempering stove of most stepped start-stop systems is divided into one section of heating, heating two sections and soaking zone, but there is the quenching furnance that specification is less to only have heating zone and soaking zone, if quenching furnance only has heating zone and soaking zone, can in heating zone, heat up and be incubated.
In single order anneal, pending materials in the tube are heating and heat preservation after quenching, and austenitic transformation fully occurs; Soaking zone at quenching furnance is lowered the temperature, the firstth, complete the cold function of a part of stove, the second Guan Wen can make pending materials in the tube come out of the stove time is lower, outside stove, operation is laggard while entering tempering stove, and temperature drop is less, the 3rd is that the preheating section temperature of tempering stove is relatively low, lower the avoiding of pending materials in the tube temperature that enters this section, this section of continuation cooling, is conducive to realize insulation and heats up.
In second order anneal, after preheating section, one section of first half section of heating of tempering stove heat up, in one period of second half section of heating, be incubated with two sections of heating, soaking time is abundant, can allow austenite fully change ferrite into; The soaking zone set temperature of tempering stove is lower, after pending materials in the tube enter, lowers the temperature, and realizes the cold cooling function of second step stove, avoids the generation of bainite.Because the preheating section of tempering stove does not have burner, can only lean on the high-temperature flue gas of heating zone, soaking zone to keep certain temperature; The temperature that the pending materials in the tube of this technique enter tempering stove is higher, in actual execution, can be heated to preset temperature in one section of first half section of heating, from heating one period of second half section, enter holding stage, two sections of the heating of adding tempering stove are incubated, soaking time is abundant, can allow austenite fully change ferrite into.
The setting of above-mentioned two rank anneal can allow whole intensification, insulation and the temperature-fall period of pending materials in the tube meet dead annealed processing requirement, makes austenite fully change ferrite into, reduces hardness and the intensity of steel, improves its plasticity.
Wherein, because the preheating section of tempering stove does not have burner, and two sections of one section of the heating of tempering stove, heating need to enter flue with the high-temperature flue gas of the burner generation of soaking zone after preheating section again, therefore preheating section is actual is heat and keep certain temperature by high-temperature flue gas, and its temperature is difficult to accurate control.If but be pressure-fired by controling of the pressure of the oven, when this section of temperature is raised to a certain comparatively high temps, pending tubing preheating section can not lower the temperature or cooling extent minimum, also can guarantee that its temperature-stable controlling in the scope of temperature one section time entering heating, realize insulation.In addition, the preheating section of quenching furnance also has such structure and function, and just its pending materials in the tube that enter stove are normal temperature state, and temperature fluctuation is relatively large.
According to the present invention, the stepped start-stop system tempering stove of quenching continuously also comprises the quenching device being arranged between quenching furnance and tempering stove, this is that tempering stove need carry out quench treatment to pending materials in the tube when carrying out modified thermal treatment because stepped start-stop system is quenched continuously, is therefore provided with quenching device.And in Full Annealing thermal treatment, do not need the step of quench treatment, so in the present invention, need vacancy to fall described quench treatment step, even enter in tempering stove again after pending materials in the tube sky is crossed described quenching device.In heat treatment process, quenching furnance is realized and being heated up, all gentle insulations, until dropping in stove after certain temperature, makes the empty quenching device of crossing between two stoves of pending materials in the tube, enters in time tempering stove and carries out temperature control.And be air cooling by the process of quenching device, temperature drop is relatively large, and nature can be divided into two parts by an annealing process.In practice, can be by regulating the stove roller table speed that enters of the furnace delivery table of quenching furnance, the machine for moving steel of quenching device and tempering stove to control transit time wherein, and utilizing the impact of rule and the condensate depression of tissue inter-variable, the impact as much as possible middle air cooling being caused is eliminated.Facts have proved, only need will be controlled at 3 minutes transit time with interior.The quench motor of tempering furnace roller way and quenching device machine for moving steel of stepped start-stop system all adopts speed control by frequency variation, only needs to adjust electric machine frequency, simple and convenient.
In one embodiment of the invention, before single order anneal, send into again pending materials in the tube send into the many materials in the tube of taking the lead in quenching furnance after.Because burner hearth is larger, when beginning charging is heat-treated, empty stove portion temperature is high, therefore being heated of several leading pending materials in the tube can obviously be better than pending materials in the tube below, causes the heat-up rate of several leading pending materials in the tube and pending materials in the tube that soaking time is carried out with it normal processing afterwards to have larger gap.So, for the more sensitive tubing of temperature, before entering formal pending materials in the tube, the useless pipe of advanced some amount is taken the lead, make formal pending materials in the tube can pass through identical as-heat-treated condition below, this batch of useless pipe is the materials in the tube of taking the lead, and this is also a kind of operating method of quenching the heat treated pending materials in the tube performance uniformity of tempering stove regulation and control batch by continous way stepping.
In another embodiment of the present invention, before second order anneal, toward sending into many in tempering stove, scoop out materials in the tube, make to scoop out the middle part that materials in the tube advance at a quick pace one section of the heating of tempering stove, heat up, be incubated and preheating section that rewind down turns back to tempering stove scoops out the pending materials in the tube that will enter tempering stove from quenching furnance is come out of the stove.In order to guarantee that the effect that pending materials in the tube are carried out after second order anneal can reach dead annealed Property & Structure level, before second order anneal, can first in tempering stove, pack into and scoop out materials in the tube, as useless pipe, after the heating zone that scoops out materials in the tube and first enter tempering stove is grilled thoroughly, make to scoop out materials in the tube and reach higher temperature, make again it be back to the temperature that preheating section improves preheating section, and the pending materials in the tube that enter are afterwards scooped out to heating zone smoothly, the pending materials in the tube that enter afterwards will be set up dynamic temperature balance at preheating section, in actual production, coordinate controling of the pressure of the oven can reach the state fair with entering boiler tube temperature.Particularly, after making to scoop out materials in the tube and being fast-forward to one section of centre of tempering stove heating and heating up, be incubated, make again its rewind down turn back to preheating section to improve the temperature of this section, thereby scoop out, after quenching furnance completes single order anneal, enter the pending materials in the tube that tempering stove carries out second order anneal, make it meet the temperature requirement of annealing process.
Preferably, control the process time that pending materials in the tube finish to tempering stove charging from quenching furnance discharging and be no more than 3 minutes, the detrimentally affect with air cooling in the middle of reducing to pending materials in the tube tissue.
Preferably, can use the stepping machine for moving steel of quenching device that the pending materials in the tube from quenching furnance discharging are transferred to tempering stove, to increase work efficiency.
The Control for Kiln Temperature of each stove is determined according to stove and steel grade characteristic.According to the present invention, one section of temperature of heating of controlling quenching furnance is the A higher than steel grade
c30～80 ℃ of temperature, two sections of temperature of heating are the A higher than steel grade
c350～80 ℃ of temperature, soaking zone temperature are the A lower than steel grade
c320～70 ℃ of temperature; One section of temperature of heating of controlling tempering stove is the A lower than steel grade
c120～50 ℃ of temperature, two sections of temperature of heating are the A lower than steel grade
c130～50 ℃ of temperature, soaking zone are the A lower than steel grade
c1100～150 ℃ of temperature.Wherein, the preheating section temperature of quenching furnance does not need to control, because the pending materials in the tube that enter are normal temperature, the function of preheating section is that it is carried out to low-temperature heat.And the preheating section thermometric of tempering stove is by furnace roof, accuracy is poor, as long as temperature is high or more close than the pending materials in the tube temperature that enters stove, generally with portable temperature-measuring gun, assists adjustment, and temperature is 650 ℃ of left and right.
The stepping period that pending materials in the tube are quenched in tempering stove continuously in stepped start-stop system determines according to materials in the tube specification, stove and steel grade characteristic, and preferably, described stepping period is 150～600s.The control step cycle can be controlled the tubing time that different temperature control sections stop in stove, has determined that it heats up and the time being incubated.The long production efficiency that reduced of stepping period, as also caused because soaking time is long coarse grains in high temperature section; The too short tubing of stepping period soaking time is too short maybe can not grill thoroughly technological temperature, and structural transformation is insufficient.
In addition, while heat-treating, make to scoop out materials in the tube and the materials in the tube of taking the lead, the materials in the tube of taking the lead and pending materials in the tube between interval can be 1～2 tooth.And, in order to make can be quickly and safely from quenching furnance the is come out of the stove empty quenching device of crossing of pending materials in the tube, can do some interim processing and debugging to equipment, as: the position of adjusting the sub-material stock stop before stepped start-stop system machine for moving steel, and protect with refractory fibre parcel, before production, with cold pipe, perform debugging; For avoiding untapped measuring element to damage, the measuring element that enters furnace roller road non-refractory of the measuring element of stepped start-stop system machine for moving steel (approach switch) and tempering stove temporarily can be removed.
Below in conjunction with concrete example, describe the present invention in detail.
In this example, according to the present invention, the technical requirements of the product that obtains is as shown in table 1:
The product technology requirement of this example of table 1
The steel pipe of quenching continuously and processing according to the present invention in tempering stove for the stepped start-stop system of Wo company, its technical process is:
The soaking zone of two sections of be incubated → quenching furnances of heating of the preheating section of quenching furnance, one section of heat up → quenching furnance of heating carry out the cold cooling → Quick air of stove cross the preheating section of quenching device → tempering stove, one section of first half section of heating and be incubated, heat up → soaking zone of the heating of tempering stove one period of second half section, two sections of be incubated → tempering stoves of heating carries out the cold cooling of the stove → air cooling of coming out of the stove.
The concrete specification of the part of take is example, and its thermal treatment process is as follows:
1) the pending materials in the tube of tetra-specifications of Φ 273mm * 13/9.5/10/8mm are two tooth one material at quenching furnance, tempering stove, the pending materials in the tube of Φ 219.1mm * 10/8mm and tri-specifications of Φ 193.7mm * 10mm are tooth one material at quenching furnance, tempering stove, and the step duration of above specification materials in the tube is 180 seconds.
2) one section of temperature of heating of controlling quenching furnance is that 850～930 ℃, two sections of temperature of heating are 900～930 ℃; Close most of burner of soaking zone, only leave indivedual burners and regulate temperature homogeneity, controlling soaking zone temperature is 780～830 ℃; Quenching furnance go out boiler tube Wen Buzuo requirement, but require accurate recording; After coming out of the stove, sky enters rapidly tempering stove after crossing quenching device.
3) one section of temperature of heating of controlling tempering stove is that 750～780 ℃, two sections of temperature of heating are 750～770 ℃; Close most of burner of soaking zone, only leave indivedual burners and regulate temperature homogeneity, controlling soaking zone temperature is 650～680 ℃; Tempering stove go out boiler tube Wen Buzuo requirement, but require accurate recording.
4) quenching furnance enters to add that Φ 219～273mm's take the lead materials in the tube more than 6 before pending materials in the tube, tempering stove adds 10 of the materials in the tube that scoop out of Φ 219～273mm to heat to one section of middle part of heating in advance, scoop out materials in the tube and before quenching furnance discharging, retreat fast and turn back to preheating section and scoop out, improve the temperature of preheating section.
Heat treated key points for operation comprise:
1) scoop out materials in the tube and the materials in the tube of taking the lead, the materials in the tube of taking the lead and pending materials in the tube between be spaced apart 1～2 tooth.
2) guarantee can be quickly and safely from quenching furnance the is come out of the stove empty quenching device of crossing of pending materials in the tube, the whole process deadline is no more than 3 minutes.
mechanics property analysis:
The mechanical performance data of the product obtaining according to this example is as shown in table 2:
The mechanical property of product that this example of table 2 obtains
From table 1 and table 2, the mechanical property of the product obtaining according to this example can meet the technical requirements of product, stable performance.
metallographic structure analysis:
The product that this example is obtained is got the 1Cr5Mo sample of Φ 219.1mm * 10mm, two specifications of Φ 193.7mm * 10mm and is done fabric analysis.Fig. 1 is 500 times of metallographic structure figure of Φ that this example obtains 219.1mm * 10mm specification product, and Fig. 2 is 500 times of metallographic structure figure of Φ that this example obtains 193.7mm * 10mm specification product.As depicted in figs. 1 and 2, after two Lot sample thermal treatments, metallographic structure is ferrite+carbide, and its tissue is identical with the tubing of alloy batch-type furnace Full Annealing thermal treatment gained with performance, and microstructure and property is all qualified.
In sum, alloy steel pipe according to the present invention carries out Full Annealing heat-treating methods and has following technique effect:
1, this technique makes the modified heat-treatment lines of tubing---and the stepped start-stop system tempering stove of quenching continuously carries out the Full Annealing thermal treatment of tubing in enormous quantities continuous high-efficient, and can control pipe performance index by flexible adjusting process parameter, creatively increase the thermal treatment function of modified heat-treatment lines, formed new ideas and working method that two rank continuous annealings and tempering stove scoop out material.
2, production efficiency is high: the application result of the present invention in production practice shows, carrying out the heat treated traditional technology of Full Annealing with separate unit batch-type furnace compares, production efficiency of the present invention is directly proportional to batch, as long as reach 100 in batches, efficiency can improve more than 10 times.
3, ton pipe thermal treatment energy consumption is low: compare with using the traditional technology of batch-type furnace, reduced the calorific loss of stove integral body lifting mild heat more frequently supporting material frame, the heat treated gas consumption of ton pipe of actual measuring and calculating drops to approximately 65 cubic metres by 125 cubic metres.
4, thermal treatment quality is high: compare with using the traditional technology of batch-type furnace, the tubing that the present invention obtains has better original curved degree and ovality, is conducive to improve pipe workpiece quality in postorder finished machined, improves lumber recovery.
The invention is not restricted to above-described embodiment, without departing from the present invention, can carry out various changes and modifications.
Claims (5)
1. an alloy steel pipe carries out Full Annealing heat-treating methods, it is characterized in that, described method adopts the stepped start-stop system tempering stove of quenching continuously sequentially to carry out single order anneal and second order anneal to pending materials in the tube, described stepped start-stop system quenching furnance and the tempering stove that tempering stove comprises that order arranges of quenching continuously
Wherein, described single order anneal comprises the steps:
Quenching furnance charging, heats up one section of the preheating section of quenching furnance, heating;
Two sections of the heating of quenching furnance, be incubated;
Soaking zone at quenching furnance carries out the cold cooling of stove;
Described second order anneal comprises the steps:
Quenching furnance discharging, the empty quenching device of crossing also carries out tempering stove charging fast;
Preheating section, one section of first half section of heating at tempering stove are incubated, heat up;
Two periods of the heating of tempering stove one period of second half sections, heating, be incubated;
Soaking zone at tempering stove carries out the cold cooling of stove, the air cooling of coming out of the stove,
Wherein, one section of temperature of heating of control quenching furnance is the A higher than steel grade
c30～80 ℃ of temperature, two sections of temperature of heating are the A higher than steel grade
c350～80 ℃ of temperature, soaking zone temperature are the A lower than steel grade
c320～70 ℃ of temperature; One section of temperature of heating of controlling tempering stove is the A lower than steel grade
c120～50 ℃ of temperature, two sections of temperature of heating are the A lower than steel grade
c130～50 ℃ of temperature, soaking zone are the A lower than steel grade
c1100～150 ℃ of temperature; The stepping period that described pending materials in the tube are quenched in tempering stove continuously in stepped start-stop system is 150～600s.
2. alloy steel pipe according to claim 1 carries out Full Annealing heat-treating methods, it is characterized in that, before described single order anneal, sends into pending materials in the tube after sending into the many materials in the tube of taking the lead in quenching furnance again.
3. alloy steel pipe according to claim 2 carries out Full Annealing heat-treating methods, it is characterized in that, before described second order anneal, toward sending into many in tempering stove, scoop out materials in the tube, described in making, scoop out the middle part that materials in the tube advance at a quick pace one section of the heating of tempering stove, heat up, be incubated and preheating section that rewind down turns back to tempering stove scoops out the pending materials in the tube that will enter tempering stove from quenching furnance is come out of the stove.
4. alloy steel pipe according to claim 1 carries out Full Annealing heat-treating methods, it is characterized in that, controls the process time that pending materials in the tube finish to tempering stove charging from quenching furnance discharging and is no more than 3 minutes.
5. alloy steel pipe according to claim 1 carries out Full Annealing heat-treating methods, it is characterized in that, uses the stepping machine for moving steel of quenching device that the pending materials in the tube from quenching furnance discharging are transferred to tempering stove.
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| CN103740900A (en) * | 2013-11-30 | 2014-04-23 | 常熟市东鑫钢管有限公司 | Heat treatment technology for seamless steel pipes |
| CN112593068A (en) * | 2020-12-03 | 2021-04-02 | 成都先进金属材料产业技术研究院有限公司 | Continuous isothermal annealing method of seamless steel pipe |
| CN113005276A (en) * | 2021-02-22 | 2021-06-22 | 包头钢铁（集团）有限责任公司 | Novel annealing heat treatment process for seamless steel pipe for 12Cr5Mo high-pressure fertilizer equipment |
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| CN102382962A (en) * | 2011-11-10 | 2012-03-21 | 浙江健力股份有限公司 | Quick spheroidizing annealing technology for GCr15 bearing steel pipe |
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