CN1193835C - Warm machining method for macking carbon steel pipe or alloy steel pipe - Google Patents
Warm machining method for macking carbon steel pipe or alloy steel pipe Download PDFInfo
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- CN1193835C CN1193835C CNB021380201A CN02138020A CN1193835C CN 1193835 C CN1193835 C CN 1193835C CN B021380201 A CNB021380201 A CN B021380201A CN 02138020 A CN02138020 A CN 02138020A CN 1193835 C CN1193835 C CN 1193835C
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Abstract
The present invention discloses a method for manufacturing carbon steel pipes or alloy steel pipes by warm machining, which belongs to the metal pipe rolling technology. The present invention orderly comprises the following four steps that a continuous casting hollow pipe blank surface is implemented with machine work processing; a pipe blank is preheated between environment temperature and recrystallization temperature; the pipe blank is rolled in a high deformation rate above the recrystallization temperature; rolled parts are cooled, etc. The present invention overcomes the defects of the prior art of multiple process steps, low product rate, high manufacturing cost, unstable finished product quality, etc. The elongation coefficient of the present invention is between 10 and 16, and the rolling speed is between 10 m/min and 20 m/min. The method belongs to an advanced method of adopting warm working to manufacture carbon steel pipes and alloy steel pipes and distinguishing from hot rolling processing and cold rolling processing at present.
Description
Technical field
The invention belongs to the metal pipe material rolling technique.Be specifically related to the method for a kind of processing and manufacturing carbon steel pipe and alloy pipe.
Background technology
The manufacture method of existing carbon steel pipe and alloy pipe, main have perforation pipe rolling and a band shaping welding.First kind of traditional manufacture method is that carbon steel and steel alloy are cast solid billet and fixed ruler cutting, sends into two rollers after heating or three-roll piercer is worn into hollow forging again, pipe carried out hot rolling and the cold rolling finished product tubing that obtains again.This method is generally to use at present, but it is many to exist operation, and the energy consumption height can not be produced overlength tube, the high deficiency of tubing manufacturing cost.By the lumber recovery of solid billet behind hot rolling first road only is about 80%.And second kind of band shaping welding, be with carbon steel and steel alloy casting base, roll into the band steel, carry out bright annealing, the processing of slitting itemize through multiple working procedure, on the welded tube unit, carry out the moulding welding then, and the general welding methods such as high frequency, direct current, argon arc, square wave that adopt of welding.This method can production overlength pipe, and is especially with the obvious advantage in the production of small-caliber thin-walled tube material and ultra-large caliber pipe material.Manufacturing cost is lower than first method, but still higher.Because be to adopt welding method, welding quality becomes the problem of paying close attention to most in the use.Though people have carried out extensive work and effort in the processing of weld seam, can not fundamentally eliminate defective and the leakage that weld seam causes all sidedly all the time.Therefore fasten with body at some important use occasions such as mesohigh boiler tube, mesohigh fluid-transporting tubing and heat exchanger etc. and be restricted.
Summary of the invention
The object of the present invention is to provide that a kind of manufacturing process is less, lumber recovery is higher, manufacturing cost is lower, the method for the warm preferably processing and manufacturing carbon steel pipe of goods pipe workpiece quality and alloy pipe, to overcome the deficiency of prior art.
Realize the technical though of purpose of the present invention, mainly based on processing of utilization temperature and thermomechanical treatment principle, formerly continuous casting hollow bloom being done surperficial machined removal of impurities handles, give pipe certain initial temperature then, and then pipe is imported the distortion rolling equipment, make pipe at pre-heating temperature, with the deformation heat that produces in the deformation speed operation of rolling, both stacks and be warming up to roll forming under the temperature conditions on the recrystallization temperature, immediately under the samming condition, suitable speed cooling and make finished product.And the said temperature processing of the present invention is the fundamental difference place with hot rolling processing and cold rolling processing.Specifically, of the present invention formerly to the preheating of the hollow bloom handled through machining surface processing removal of impurities, only be to be heated to environment temperature between the recrystallization temperature.The present invention is this to the pre-warmed technical measures of pipe, can effectively cut down the consumption of energy, reduce manufacturing cost, and can make the distortion rolling temperature of pipe again, rise on the recrystallization temperature, improved the plasticity of as cast condition pipe, and have enough degrees of superheat, and improved the lengthening coefficient of pipe distortion, prolonged the process of pipe deformed region scope and dynamic recrystallization, and make carbon steel pipe and alloy pipe have enough conditions, realize perfect recrystallization, thereby reach the original intention of the present invention that improves rolling efficiency and manufactured goods pipe workpiece quality.
The present invention realizes that the technical scheme of its purpose is, is base-material with the continuous casting hollow bloom, carries out according to following steps successively: the processing of pipe machining surface; The pipe preheating; Pipe is rolling; Rolled parts cooling, and pipe preheating and the rolling step of pipe are carried out in protective atmosphere.
The present invention is according to the different recrystallization temperature of various material carbon steel pipes and alloy pipe, and above steps can have multiple concrete technical measures.But the present invention is through experiment repeatedly and the preferred concrete technical measures of each step, and inventive point just of the present invention is:
In pipe machining surface procedure of processing, what take is car or the machining process that mills or grind, and its machined cutting depth, is controlled in the scope that can remove pipe surface casting flaw.By the processing of pipe machining surface, make the pipe surface be non-oxidation light attitude.And for continuous casting carbon steel and steel alloy hollow bloom, cutting depth generally is controlled in 0.3mm～0.5mm scope.And be higher than Vehicle Processing owing to mill the processing work efficiency, so the present invention's recommendation is to mill processing.Formed waste material after milling the processing cutting can be collected the back reuse immediately.
At the pipe preheating step, be under the protective atmosphere condition, will be through the surface mach pipe, preheat to 500 ℃～600 ℃.Because plasticity is low at normal temperatures for the as-cast structure of hollow bloom, especially before the conduction of pipe distortion heat does not form as yet, set up relatively difficulty of stable rolling state, and the present invention preheats step at pipe, specially in focal length (about 300mm) scope to the pipe head, be heated to 800 ℃～1000 ℃, that is to say, said pipe preheats, and the pre-heating temperature in focal length's scope of pipe head is 800 ℃～1000 ℃.And its later pre-heating temperature remains 500 ℃～600 ℃.The present invention takes preheats technical measures, and be online fuel gas flame heat, or block electric resistance heated, or the induction coil heating.
In the rolling step of pipe, be under the protective atmosphere condition, head is heated to 800 ℃～1000 ℃ pipe, and then import the distortion rolling equipment.In fact the present invention is on the continuous production line of a time, carries out 4 steps of the present invention successively.Thereby correctly say, be with pre-warmed pipe, and then import the distortion rolling equipment, and pipe is in its pre-heating temperature and its deformation heat that produces in the distortion operation of rolling, both are superimposed and are warming up under 900 ℃～1200 ℃ the rolling temperature condition, are rolled with deformation speed to be shaped.Because pipe is that deformation is taking place more than the recrystallization temperature and under certain degree of superheat state, the plasticity of pipe is big undoubtedly, lengthening coefficient is big, the distortion head of district, the process of the dynamic recrystallization that is taken place is long, and under the roll off repeatedly of a plurality of rolls of multiple roll planetary rolling, and guaranteed that effectively the present invention produces the success of high-quality manufactured goods tubing.
At the rolled parts cooling step, be and then with the rolled parts of roll forming, under the samming condition, be cooled to environment temperature with suitable cooling velocity.Specifically, be and then with the rolled parts of roll forming, under the samming condition, be cooled to environment temperature with 10 ℃/second～100 ℃/second rate of temperature fall.So-called samming also can be referred to as constant temperature.And the essence intension of samming is, after finishing the distortion rolling shedule, and the periphery of the rolled parts in the rolling district of distortion is left in operation, adopt the electric induction coil that rolled parts is heated again, make its temperature on the basis of 900 ℃～1200 ℃ of distortion rolling temperatures, raise 30 ℃～80 ℃ again, and allow this temperature equalization ground keep certain hour.That is to say that suitable speed is cooled to the samming temperature of environment temperature under the said samming condition, be more than the rolling temperature 30 ℃～80 ℃.Then, allow the importing water-bath of pipe rolled parts or the spray of soaking be cooled to environment temperature again.And water-bath cooling purpose of the present invention is to make the rolling speed of rolled parts with 10～20m/min, by what realize in the emulsion bath that is about 1～1.5m.Suitable speed cooling essence is a kind of thermomechanical treatment, and its purpose mainly is crystal grain thinning, makes manufactured goods tubing of the present invention, is in the excellent mechanical property state in follow-up deep-processing process and even under the working condition of subsequent product for a long time.For the serious steel grade of hardening by cooling, then the mode with control spray intensity of cooling makes its slow cooling to environment temperature.
As described in formerly, the temperature that pipe distortion is rolling is the principal element of decision pipe lengthening coefficient, particularly processes rolling steel alloy tubing, is multicomponent alloy, its constituent content widely different.In view of above-mentioned consideration, the present invention pays attention to being out of shape selecting for use of rolling equipment especially.Its distortion rolling equipment should satisfy adjustable pipe deformation temperature at least, has the protective atmosphere device, to pipe requirements such as roll off and roll off area be bigger repeatedly.The present invention preferably is out of shape rolling equipment, is 2～6 roller planetary rolling machines.That is to say that said distortion rolling equipment is adjustable pipe deformation temperature and 2～6 roller planetary rolling machines that have the protective atmosphere device.
The present invention is for the pipe rolling temperature, preheat, rolling and cool off online adjusting and control on three step continuous processing lines, realize by following three kinds of technical measures:
First kind is the control technique measure that is applied on the concerned process steps.It is sent power, pipe preheat temperature, pipe lengthening coefficient and pipe to and is out of shape rolling district coolant rate and realizes the pipe rolling temperature by adjusting pipe.
And second kind be the control technique measure that is applied in the relevant speed of rolling equipment.It is that the height of the rate of deformation that realizes by the rotating speed of said planetary rolling machine rotary disk and rolling speed is regulated and control the pipe rolling temperature.The present invention preferably adjusts the range of speeds of planetary rolling machine rotary disk, be controlled within 280～500rpm, and the scope of adjustment rolling speed is controlled within 10～20m/min.That is to say, said deformation speed, be by planetary rolling machine rotary disk rotating speed in 280～500rpm scope, and the adjustment of rolling speed in 10～20m/min scope regulate and control, and the regulation and control by deformation speed, and regulation and control pipe rolling temperature.
And the third is the control technique measure that is applied on the dependency structure of rolling equipment.It is to send angle to by the roll of adjusting said planetary rolling machine, and regulation and control pipe rolling temperature.The present invention preferably adjusts the scope that said roll is sent angle to, is controlled between 6 °～8 °.That is to say that said pipe rolling temperature is to send the adjustment of angle in 6 °～8 ° scopes to by planetary rolling machine roll to regulate and control.
The specific embodiment
The present invention will be described further by the following specific embodiment, so as to the present invention realize the technical scheme of its purpose and characteristics solve more clear.
One of exemplary embodiment of the present invention, rolling is 10# mild steel continuous casting hollow bloom.Rolling is to carry out on the XR-SG90 three-roller planetary pipe mill after the improvement.Pipe is produced for the vertical continuous casting method, and original dimension is φ 90 * 25mm, and pipe carries out surface treatment via the process equipment that mills of 3 milling heads before rolling, and its cutting depth is 0.5mm, makes the pipe surface be non-oxidation light attitude, online then preheating.The heating of employing induction coil makes pipe head 300mm be preheated to 800 ℃, and other parts are heated to 500 ℃.Carry out rolling processing then by the XR-SG90 three-roller planetary rolling mill after improving.Pipe is warming up to 1100 ℃～1150 ℃ very soon after preheat temperature and the hot temperature stack of distortion.Pipe mill is that 15m/min carries out work with the rolling speed, and constantly with its rolling pipe fitting send to forward.Periphery at the pipe fitting that is transported out in adjacent rolling district is equipped with electric induction heater, makes rolled parts continue to be warming up to 1180 ℃, and this temperature rise of 1180 ℃ is continued to keep for 5～10 times in second, even enter long 2.5 with the rolled pipe part
mThe emulsion spray groove in, rolling pipe fitting approximately in the time in 10 seconds by spray groove, and be cooled to environment temperature.10# steel pipe specification after rolling is φ 48 * 3mm.Lengthening coefficient is 12.Tube surfaces does not have any folding pattern and other defective exists, and rolls back body metallographic structure and is very thin equi-axed crystal state (perfect recrystallization attitude).Its tensile strength 〉=430MPa, percentage elongation are 25%～30%.The reflection of eddy current inspection assay, the defect point of finished product seldom.Rolling back tubing is best in quality, and rolling is successful.The lumber recovery of the low carbon steel pipe that is shut out to the three-roller planetary pipe mill by hollow bloom is about 94%.
Two of the specific embodiment of the present invention.The GCr15 bearing steel hollow bloom of warm-rolling continuous casting.Rolling is to carry out on the XR-SG90 three-roller planetary pipe mill after the improvement.The pipe original dimension is φ 90 * 25mm.Through milling processing processing is cut on the pipe surface, cutting depth is 1mm, make the pipe surface be the non-oxidation bright state, adopt induction coil to preheat then, make the pipe head be warming up to 800 ℃, enter the XR-SG90 three-roller planetary pipe mill after the improvement then, earlier tube head is set up the stable rolling state, wait for after the tube head roll forming that the pipe preheat temperature is dropped to 500 ℃, and later pipe enters rolling shedule.Thereafter rolling shedule is as one of specific embodiment.And its rolling temperature is 1120 ℃～1160 ℃, and rolling speed is 12m/min, and the samming temperature before the pipe fitting cooling is 1160 ℃.Tubing specification after rolling is φ 47 * 3mm, and its lengthening coefficient is 11.Roll the back steel tube surface and do not have any folding pattern and other defective.Its tensile strength is 595MPa～675MPa, percentage elongation 20.5%～27%.Rolling is successful.This bearing steel pipe is in follow-up stretching, and disconnected pipe phenomenon takes place the defective of almost not having because of body itself.The lumber recovery of the bearing steel pipe that is shut out to the three-roller planetary pipe mill by hollow bloom is about 94%.
In sum, the on-line continuous flow chart that the present invention had is few, automaticity height, and lumber recovery height, and the tubing low cost of manufacture, characteristics such as tubing quality better are conspicuous.Compared with the prior art, the present invention has tangible substantive distinguishing features and obvious improvement.
Claims (6)
1, the method for a kind of temperature processing and manufacturing carbon steel pipe and alloy pipe is a base-material with the continuous casting hollow bloom, carries out according to following steps successively: the processing of pipe machining surface; The pipe preheating; Pipe is rolling; Rolled parts cooling, and pipe preheating and the rolling step of pipe are carried out in protective atmosphere, it is characterized in that:
A, in pipe machining surface procedure of processing, that takes is car or mills or grinding machine tool processing method, and its machined cutting depth, is controlled in the scope that can remove pipe surface casting flaw;
B, at the pipe preheating step, be to preheat 500 ℃～600 ℃ through mach pipe;
C, in the rolling step of pipe, be with pre-warmed pipe, import the distortion rolling equipment, and pipe is in its pre-heating temperature and its deformation heat that produces in the distortion operation of rolling, both are superimposed and are warming up under 900 ℃～1200 ℃ the rolling temperature condition, are rolled with deformation speed to be shaped;
D, at the rolled parts cooling step, be and then with the rolled parts of roll forming, on the basis of 900 ℃～1200 ℃ of distortion rolling temperatures, raise 30 ℃～80 ℃ again, and allow this temperature equalization ground keep being cooled to environment temperature with suitable cooling velocity under the samming condition of certain hour.
2, the method for temperature processing and manufacturing carbon steel pipe according to claim 1 and alloy pipe, it is characterized in that: said pipe preheats, and the pre-heating temperature in focal length's scope of pipe head is 800 ℃～1000 ℃.
3, the method for temperature processing and manufacturing carbon steel pipe according to claim 1 and alloy pipe is characterized in that, said distortion rolling equipment is adjustable pipe deformation temperature and 2～6 roller planetary rolling machines that have the protective atmosphere device.
4, the method for temperature processing and manufacturing carbon steel pipe according to claim 1 and alloy pipe, it is characterized in that, said pipe rolling temperature is sent power, pipe preheat temperature, pipe lengthening coefficient and pipe to and is out of shape rolling district coolant rate and regulates and control by adjusting pipe.
5, the method for temperature processing and manufacturing carbon steel pipe according to claim 1 and alloy pipe, it is characterized in that, said deformation speed, be by planetary rolling machine rotary disk rotating speed in 280～500rpm scope, and the adjustment of rolling speed in 10～20m/min scope regulated and control, and by the regulation and control of deformation speed, and regulation and control pipe rolling temperature.
6, the method for temperature processing and manufacturing carbon steel pipe according to claim 1 and alloy pipe is characterized in that, said pipe rolling temperature is to send the adjustment of angle in 6 °～8 ° scopes to by planetary rolling machine roll to regulate and control.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB021380201A CN1193835C (en) | 2002-07-24 | 2002-07-24 | Warm machining method for macking carbon steel pipe or alloy steel pipe |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB021380201A CN1193835C (en) | 2002-07-24 | 2002-07-24 | Warm machining method for macking carbon steel pipe or alloy steel pipe |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1390655A CN1390655A (en) | 2003-01-15 |
| CN1193835C true CN1193835C (en) | 2005-03-23 |
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| Application Number | Title | Priority Date | Filing Date |
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| CNB021380201A Expired - Fee Related CN1193835C (en) | 2002-07-24 | 2002-07-24 | Warm machining method for macking carbon steel pipe or alloy steel pipe |
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| CN (1) | CN1193835C (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105964693B (en) * | 2016-01-12 | 2018-02-02 | 江苏隆达超合金航材股份有限公司 | The planetary rolling production technology of nickel base superalloy pipe |
| CN107138533A (en) * | 2017-07-13 | 2017-09-08 | 射洪县才伦建材有限责任公司 | A kind of high steel pipe processing method of lumber recovery |
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| CN1390655A (en) | 2003-01-15 |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| EE01 | Entry into force of recordation of patent licensing contract |
Assignee: Jiangsu Guoqiang Zinc Plating Industrial Co., Ltd. Assignor: Xingrong Hi-Tech Co., Ltd., Jiangsu Contract fulfillment period: 2007.3.26 to 2012.12.31 contract change Contract record no.: 2009320001299 Denomination of invention: Warm machining method for macking carbon steel pipe or alloy steel pipe Granted publication date: 20050323 License type: Exclusive license Record date: 2009.7.29 |
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| LIC | Patent licence contract for exploitation submitted for record |
Free format text: EXCLUSIVE LICENSE; TIME LIMIT OF IMPLEMENTING CONTACT: 2007.3.26 TO 2012.12.31; CHANGE OF CONTRACT Name of requester: JIANGSU GUOQIANG ZINC-PLATING INDUSTRY CO., LTD. Effective date: 20090729 |
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| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20050323 Termination date: 20120724 |