CN102327919A - Extrusion forming method for hole forming pin for Incone1690 alloy for seamless pipe - Google Patents
Extrusion forming method for hole forming pin for Incone1690 alloy for seamless pipe Download PDFInfo
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Abstract
The invention relates to an extrusion forming method for a hole forming pin for an Incone1690 alloy for a seamless pipe. A stepped heating mode is adopted in pipe billet heating, and a glass lubricant-A5 powder is adopted to lubricate a pipe billet. The extrusion process of the pipe billet comprises an extrusion starting to pipe breakthrough working tape forming stage and a pipe stable extrusion stage, wherein the extrusion speed in the extrusion starting to pipe breakthrough working tape forming stage is increased linearly to 150-250mm/s from 0mm/s; extrusion at a constant speed is adopted in the pipe stable extrusion stage, and the extrusion speed is 150-250mm/s, thereby, a hot forming pipe is obtained. In the extrusion forming method for the hole forming pin for the Incone1690 alloy for the seamless pipe, the pipe billet is formed in a three-dimensional pressure stress state, thereby, the plastic flow capacity of metal is improved. Moreover, the formed pipe billet and a mould respectively have a symmetry property, so that a formed pipe has a uniform texture, high quality of inner and outer surface layers, high precision and a high mechanical property. The yield stress at room temperature can reach 314-325MPa; the tensile strength can reach 746-763MPa; and the elongation rate can reach at least 44 percent.
Description
Technical field
The present invention relates to plastic deformation hot-working field, specifically is a kind of high-temperature nickel-base alloy (Inconel690 alloy) heavy caliber thick wall seamless tubular goods pecker extrusion forming process.
Technical background
The production of modern large-scale seamless tubular goods is main with hot rolling.The technological process that hot rolled seamless steel tube is produced can be divided into three main transformer shape operations basically: at first through boring, perforation is perhaps rolled the hole and is processed tubular blank i.e. " hollow billet "; Be rolled into " hollow forging " of hot production tube requirement wall thickness then; Be rolled into " production tube " of hot production tube requirement external diameter at last.But there be so-called " Mannesmann effect " in pipe in the hot piercing process; That is: pipe is bearing complicated power, distortion and action of temperature in the deformed area; Crack at the hollow billet surfaces externally and internally easily, defective such as layering, interior folding, spiral lamination, the hollow billet of production is of poor quality, has a strong impact on the quality of tubing following process; Be lowered into the particularly qualification rate of accurate seamless pipe of QC, particularly outstanding to difficult-to-deformation material such as high-alloy steel, the austenitic stainless steel etc. of thermoplasticity difference.In addition, in the tubing course of hot rolling, also there are defectives such as non-metallic inclusion interlayer phenomenon, dimensional accuracy be lower.
The Inconel690 alloy is a kind of Cr of containing up to 30% Austenitic high-temperature nickel-base alloy, has extremely strong anti-oxidant, decay resistance, is widely used in industrial circles such as petrochemical industry, metallurgy, nuclear power source.But because Inconel690 alloy deformation drag is big, the plastic working temperature range is narrow.This alloy pipe is applied to wait HTHP, the hyperoxia voltinism, and in the strong corrosive environment, working environment is quite abominable, so to pipe workpiece quality, dimension precision requirement height, hot rolling technology can't satisfy the production of this high-performance, high accuracy seamless tubular goods.
A kind of centre spinning method that is applicable to special steel, high-temperature alloy steel seamless pipe is disclosed in notification number is the patent application of CN 1086470A; Be characterized in the liquid metal of uniform temperature is poured in the columnar mould; Adopt the method for machinery that mould is rotated; Metal liquid is because the action of centrifugal force crystallization in mould inner wall, is finally processed seamless pipe.But the seamless tubular goods surface quality that centre spinning method is produced is not high, need carry out the machinings such as turning in later stage, the consumption that has increased productivity.And because crystal structure principle and principle of expanding with heat and contracting with cold adopt casting method to produce defectives such as the crystal grain that can produce to a certain degree is thick, pore, shrinkage porosite, these defectives all can be avoided in the present invention.
At application number is patent 200710011942.X; Publication number is to disclose a kind of technological process of adopting hot continuous rolling to produce large-sized seamless steel pipe in the patent application document of CN 101077503A; Main method is earlier with heating of pipe blank, carries out two-way heat centering through coming out of the stove then through two-way hot centering machine group, gets into the awl rotary piercing then; Wherein the punch foreground is provided with to rotate to add and send device, push rod active rotation behind the punch.Hollow billet gets into five empty three roller retained mandrel pipe mills that subtract machine of band and is rolled into pipe.This method complex procedures, the difficult control of precision is difficult for realizing producing continuously in two-way hot centering process, and metal receives two-way action of compressive stress in the operation of rolling, is prone to defectives such as face crack, metallic inclusion.
Summary of the invention
For overcoming the deficiency that existing hot rolling technology can't satisfy Inconel690 alloy high-performance, the production of high accuracy seamless tubular goods, the present invention proposes a kind of Inconel690 alloy seamless tubing pecker extrusion forming method.
The present invention includes following steps:
The first step, pipe preparation
According to tubing inside/outside diameter size and pipe length, and the internal diameter size of recipient, confirm pipe internal diameter, external diameter and length: the pipe external diameter is: D
The pipe external diameter=D
Recipient-(5～20mm); The pipe internal diameter is: D
The pipe internal diameter=D
Pipe internal diameter+ (5～15mm); Pipe length is: L
Pipe=(D
Tube outer diameter 2-D
Pipe internal diameter 2) * L
Tubing÷ (D
The pipe external diameter 2-D
The pipe internal diameter 2)+L
SurplusAdopt the method for centrifugal casting to produce pipe, pouring temperature is 1460-1580 ℃, and rotational speed of casting die is 500～1000r/min, and pouring molten steel speed is 50～200kg/s; Cast finishes, and when treating that the pipe temperature is reduced to 1080 ℃～1100 ℃, reduces rotating speed to 300～500r/min, continues to stop behind the rotation 15-60min; Treat to carry out when the pipe temperature is reduced to 850 ℃ the demoulding; It is 850 ℃ annular furnace that the pipe of centrifugal casting is put into preheat temperature, behind the insulation 1h, cools to room temperature with the furnace; Carry out turning processing, reconditioning pipe surfaces externally and internally and former and later two sections at last, and rounding, r
Fillet=5～12mm; The pipe that obtains preparing;
Second step, heating of pipe blank
Heating of pipe blank adopts the staged mode of heating: at first, pipe put into be preheated to 870 ℃ resistance-heated furnace, to resistance-heated furnace insulation 6h; Pipe is continued to be heated to 1050 ℃ in resistance-heated furnace, the duration of heating process is 0.5h, insulation 1.5h; Pipe inserted in the induction furnace that power is 1250Kw be heated to 1130～1180 ℃, the pipe after obtaining heating;
The 3rd step, pipe lubricate
Pipe is lubricated to comprise lubricated to lubricated, the internal surface of bloom of outer surface of tube blank; Lubricating on the powder platform of shop of described outer surface of tube blank and internal surface of bloom accomplished; Detailed process is:
Lubricating of outer surface of tube blank: the gradient that will spread the powder platform is adjusted 5～10 °; Glass lubricant-A5 powder through power spreading device even spreading 5～8mm on the powder platform of shop; Pipe after the heating is placed on shop powder platform one end and makes it on the powder platform of shop, roll a week with glass lubricant-A5 powder fusion, and the rolling speed of pipe is 0.3～0.5rad/s; It is the glass-film of 1～2mm that glass lubricant after the fusion-A5 powder forms thickness at the pipe extexine;
Lubricating of internal surface of bloom: when pipe rolls on the powder platform of shop, utilize spray gun that glass lubricant-A5 powder is coated in the pipe endosexine uniformly, coating thickness is 1～2mm;
Obtain the pipe after inner surface and outer surface lubricate;
The 4th goes on foot, pipe is pushed
To be fitted on the operative end surface of extrusion die with the ready-made glass isolator of glass lubricant before the extruding; Pipe put into be preheated to 500 ℃ recipient; Through dummy block pipe is pushed; Extrusion process comprises that extruding begins to break through the work zone shaping stage to tubing and stablizes with tubing and extrude the stage; Wherein, extruding begins to rise to 150～200mm/s to the extrusion speed that tubing is broken through in the shaping stage of work zone by the 0mm/s linearity, and tubing is stable to be extruded the stage and at the uniform velocity push, and its extrusion speed is 150～250mm/s; Obtain hot forming tubing;
The 5th step, tubing post processing
Described tubing post processing comprises aligning, tubing solution treatment, tube surfaces pickling processes, tubing ultrasonic examination and the fine finishining of tubing;
Hot forming tubing is aligned; When hot forming tubing reaches Len req, tubing is cut off; The hot forming tubing that cuts off is put into the annular furnace that is preheated to 1080～1150 ℃ carry out solution treatment, the solution treatment time is 5～8h, cools to room temperature with the furnace; Hot forming tubing after the solution treatment is carried out surface acid-washing handle and ultrasonic examination, after fine finishining, obtain finished product tubing.
When adopting flame furnace to heating of pipe blank, the sulfur content in diesel oil and the heavy oil is lower than 5%, and the sulfur content in the coal gas is lower than 0.7g/m
3
The thickness of said glass isolator is 5～10mm, and shape is consistent with the operative end surface of extrusion die.
Extrusion die adopts conical die, and modular angle α is 30～40 °, and calibrating strap length h is 90～120mm, and inlet fillet r is 5～10mm.
The objective of the invention is on large-tonnage less-deformable alloy horizontal extruder, to realize Inconel690 alloy heavy caliber thick wall seamless tubular goods pecker extrusion molding, to obtain the Inconel690 alloy heavy caliber thick wall tubing that dense structure is good, dimensional accuracy is high, surface quality is good.
Adopt the inventive method can produce Inconel690 alloy large-size or the ultra-large thick-wall seamless tubular goods of external diameter 240～800mm, length 6000～18000mm, wall thickness 20～120mm.The pipe of the inventive method is under the three-dimensional compressive stress state, to be shaped; Improved the plastic flowing ability of metal, and shaping pipe and tool and mould all have symmetry, so; The Inconel690 alloy heavy caliber thick wall tubing even tissue of extruding, tubing parent metal grain size can be controlled in 6～8 grades; By GB639, GB228 the forming tube sample has been carried out stretching experiment, obtained the mechanical property of forming tube under the room temperature: yield stress can reach 314～325MPa, and tensile strength can reach 746～763MPa, and percentage elongation can reach more than 44%; And the present invention has the high advantage of extrusion production efficient, and can realize continuous production, so, in rolling mill practice is produced the time of 1 tubing, the present invention's 8～10 tubing that can be shaped, thus improved the production efficiency employing.For example: adopt external diameter 780mm, internal diameter 310mm, the pipe of length 1100mm is produced external diameter 350mm, and internal diameter 300mm, the tubing of wall thickness 50mm, extrusion time only need 3～l0min can the be shaped hollow billet of 16900mm or the finished product of 16000mm.
Description of drawings
Fig. 1 is a process chart of the present invention.
Fig. 2 is a heating of pipe blank process sketch map.
The specific embodiment
Embodiment one:
Present embodiment is the Inconel690 heavy caliber thick wall seamless tubular goods pecker extrusion molding of on 20,000 tons of less-deformable alloy horizontal extruders, realizing, the specification of tubing is Φ 420mm * 60mm-6000mm, and concrete operations are following:
The first step, pipe preparation
According to tubing inside/outside diameter size and pipe length, and the internal diameter size of recipient, confirm pipe internal diameter, external diameter and length: the internal diameter of the container of 20,000 tons of less-deformable alloy horizontal extruders is Φ 800mm, pipe external diameter computing formula is: D
The pipe external diameter=D
Recipient-(5～20mm), D in the present embodiment
The pipe external diameter=795mm.Pipe internal diameter computing formula is: D
The pipe internal diameter=D
Pipe internal diameter+ (5～15mm), D in the present embodiment
The pipe internal diameter=305mm.Pipe length computation formula is: L
Pipe Base=(D
Tube outer diameter 2-D
Pipe internal diameter 2) * L
Tubing÷ (D
The pipe external diameter 2-D
The pipe internal diameter 2)+L
Surplus, L in the present embodiment
Pipe=1100mm.Adopt the method for centrifugal casting to produce pipe, pouring temperature is 1460 ℃, and rotational speed of casting die is 500r/min, and pouring molten steel speed is 50kg/s.Cast finishes, and when treating that the pipe temperature is reduced to 1080 ℃, reduces rotating speed to 300r/min, continues to stop behind the rotation 15min.Treat to carry out when the pipe temperature is reduced to 850 ℃ the demoulding.It is 850 ℃ annular furnace that the pipe of centrifugal casting is put into preheat temperature, behind the insulation 1h, cools to room temperature with the furnace.Carry out turning processing, reconditioning pipe surfaces externally and internally and former and later two sections at last, and rounding, r
Fillet=5mm.The pipe that obtains preparing.
Second step, heating of pipe blank
Heating of pipe blank adopts the staged mode of heating: at first, pipe put into be preheated to 870 ℃ resistance-heated furnace, to resistance-heated furnace insulation 6h.Pipe is continued to be heated to 1050 ℃ in resistance-heated furnace, the duration of heating process is 0.5h, insulation 1.5h.Pipe inserted in the induction furnace that power is 1250Kw be heated to 1130 ℃, the pipe after obtaining heating.
The 3rd step, pipe lubricate
Pipe is lubricated to comprise lubricated to lubricated, the internal surface of bloom of outer surface of tube blank.Lubricating on the powder platform of shop of described outer surface of tube blank and internal surface of bloom accomplished.Detailed process is:
Lubricating of outer surface of tube blank: the gradient that will spread the powder platform is adjusted 5 °.Glass lubricant-A5 powder through power spreading device even spreading 5mm on the powder platform of shop.Pipe after the heating is placed on shop powder platform one end and makes it on the powder platform of shop, roll a week with glass lubricant-A5 powder fusion, and the rolling speed of pipe is 0.3rad/s.It is the glass-film of 1mm that glass lubricant after the fusion-A5 powder forms thickness at the pipe extexine.
Lubricating of internal surface of bloom: when pipe rolls on the powder platform of shop, utilize spray gun that glass lubricant-A5 powder is coated in the pipe endosexine uniformly, coating thickness is 1mm.
Obtain the pipe after inner surface and outer surface lubricate.
The 4th goes on foot, pipe is pushed
To be fitted on the operative end surface of extrusion die with the ready-made glass isolator of glass lubricant before the extruding, the thickness of said glass isolator is 5mm, and shape is consistent with the operative end surface of extrusion die.
Pipe put into be preheated to 500 ℃ recipient.Through dummy block pipe is pushed.Extrusion process comprises that extruding begins to break through the work zone shaping stage to tubing and stablizes with tubing and extrude the stage.Wherein, extruding begins to rise to 150mm/s to the extrusion speed that tubing is broken through in the shaping stage of work zone by the 0mm/s linearity, and tubing is stable to be extruded the stage and at the uniform velocity push, and its extrusion speed is 150mm/s.The extrusion die that the present invention adopts is a conical die, and modular angle α is 30 °, and calibrating strap length h is 90mm, and inlet fillet r is 5mm.
Obtain hot forming tubing.
The 5th step, tubing post processing
Described tubing post processing comprises aligning, tubing solution treatment, tube surfaces pickling processes, tubing ultrasonic examination and the fine finishining of tubing.
Hot forming tubing is aligned.When hot forming tubing reaches Len req, tubing is cut off.The hot forming tubing that cuts off is put into the annular furnace that is preheated to 1080 ℃ carry out solution treatment, the solution treatment time is 5h, cools to room temperature with the furnace.Hot forming tubing after the solution treatment is carried out surface acid-washing handle and ultrasonic examination, after fine finishining, obtain finished product tubing.
Embodiment two:
Present embodiment is the Inconel690 heavy caliber thick wall seamless tubular goods pecker extrusion molding that certain research institute realizes on 3.6 ten thousand tons of less-deformable alloy horizontal extruders; The tubing specification is Φ 500mm * 75mm-12000mm, and concrete operations are following:
The first step, pipe preparation
According to tubing inside/outside diameter size and pipe length, and the internal diameter size of recipient, confirm pipe internal diameter, external diameter and length: the internal diameter of the container of 20,000 tons of less-deformable alloy horizontal extruders is Φ 1100mm, pipe external diameter computing formula is: D
The pipe external diameter=D
Recipient-(5～20mm), D in the present embodiment
The pipe external diameter=1090mm.Pipe internal diameter computing formula is: D
The pipe internal diameter=D
Pipe internal diameter+ (5～15mm), D in the present embodiment
The pipe internal diameter=365mm.Pipe length computation formula is: L
Pipe Base=(D
Tube outer diameter 2-D
Pipe internal diameter 2) * L
Tubing÷ (D
The pipe external diameter 2-D
The pipe internal diameter 2)+L
Surplus, L in the present embodiment
Pipe=1500mm.Adopt the method for centrifugal casting to produce pipe, pouring temperature is 1500 ℃, and rotational speed of casting die is 750r/min, and pouring molten steel speed is 150kg/s.Cast finishes, and when treating that the pipe temperature is reduced to 1100 ℃, reduces rotating speed to 400r/min, continues to stop behind the rotation 30min.Treat to carry out when the pipe temperature is reduced to 850 ℃ the demoulding.It is 850 ℃ annular furnace that the pipe of centrifugal casting is put into preheat temperature, behind the insulation 1h, cools to room temperature with the furnace.Carry out turning processing, reconditioning pipe surfaces externally and internally and former and later two sections at last, and rounding, r
Fillet=10mm.The pipe that obtains preparing.
Second step, heating of pipe blank
Heating of pipe blank adopts the staged mode of heating: at first, pipe put into be preheated to 870 ℃ resistance-heated furnace, to resistance-heated furnace insulation 6h.Pipe is continued to be heated to 1050 ℃ in resistance-heated furnace, the duration of heating process is 0.5h, insulation 1.5h.Pipe inserted in the induction furnace that power is 1250Kw be heated to 1150 ℃, the pipe after obtaining heating.
The 3rd step, pipe lubricate
Pipe is lubricated to comprise lubricated to lubricated, the internal surface of bloom of outer surface of tube blank.Lubricating on the powder platform of shop of described outer surface of tube blank and internal surface of bloom accomplished.Detailed process is:
Lubricating of outer surface of tube blank: the gradient that will spread the powder platform is adjusted 8 °.Glass lubricant-A5 powder through power spreading device even spreading 6mm on the powder platform of shop.Pipe after the heating is placed on shop powder platform one end and makes it on the powder platform of shop, roll a week with glass lubricant-A5 powder fusion, and the rolling speed of pipe is 0.4rad/s.It is the glass-film of 1.5mm that glass lubricant after the fusion-A5 powder forms thickness at the pipe extexine.
Lubricating of internal surface of bloom: when pipe rolls on the powder platform of shop, utilize spray gun that glass lubricant-A5 powder is coated in the pipe endosexine uniformly, coating thickness is 1.5mm.
Obtain the pipe after inner surface and outer surface lubricate.
The 4th goes on foot, pipe is pushed
To be fitted on the operative end surface of extrusion die with the ready-made glass isolator of glass lubricant before the extruding, the thickness of said glass isolator is 7.5mm, and shape is consistent with the operative end surface of extrusion die.
Pipe put into be preheated to 500 ℃ recipient.Through dummy block pipe is pushed.Extrusion process comprises that extruding begins to break through the work zone shaping stage to tubing and stablizes with tubing and extrude the stage.Wherein, extruding begins to rise to 200mm/s to the extrusion speed that tubing is broken through in the shaping stage of work zone by the 0mm/s linearity, and tubing is stable to be extruded the stage and at the uniform velocity push, and its extrusion speed is 200mm/s.The extrusion die that the present invention adopts is a conical die, and modular angle α is 35 °, and calibrating strap length h is 110mm, and inlet fillet r is 7.5mm.
Obtain hot forming tubing.
The 5th step, tubing post processing
Described tubing post processing comprises aligning, tubing solution treatment, tube surfaces pickling processes, tubing ultrasonic examination and the fine finishining of tubing.
Hot forming tubing is aligned.When hot forming tubing reaches Len req, tubing is cut off.The hot forming tubing that cuts off is put into the annular furnace that is preheated to 1110 ℃ carry out solution treatment, the solution treatment time is 6.5h, cools to room temperature with the furnace.Hot forming tubing after the solution treatment is carried out surface acid-washing handle and ultrasonic examination, after fine finishining, obtain finished product tubing.
Embodiment three
Present embodiment is the Inconel690 heavy caliber thick wall seamless tubular goods pecker extrusion molding that certain research institute realizes on 3.6 ten thousand tons of less-deformable alloy horizontal extruders; The tubing specification is Φ 580mm * 90mm-12000mm, and concrete operations are following:
The first step, pipe preparation
According to tubing inside/outside diameter size and pipe length, and the internal diameter size of recipient, confirm pipe internal diameter, external diameter and length: the internal diameter of the container of 3.6 ten thousand tons of less-deformable alloy horizontal extruders is 1100mm, pipe external diameter computing formula is: D
The pipe external diameter=D
Recipient-(5～20mm), D in the present embodiment
The pipe external diameter=1180mm.Pipe internal diameter computing formula is: D
The pipe internal diameter=D
Pipe internal diameter+ (5～15mm), D in the present embodiment
The pipe internal diameter=415mm.Pipe length computation formula is: L
Pipe Base=(D
Tube outer diameter 2-D
Pipe internal diameter 2) * L
Tubing÷ (D
The pipe external diameter 2-D
The pipe internal diameter 2)+L
Surplus, L in the present embodiment
Pipe=2200mm.Adopt the method for centrifugal casting to produce pipe, pouring temperature is 1560 ℃, and rotational speed of casting die is 1000r/min, and pouring molten steel speed is 200kg/s.Cast finishes, and when treating that the pipe temperature is reduced to 1090 ℃, reduces rotating speed to 500r/min, continues to stop behind the rotation 60min.Treat to carry out when the pipe temperature is reduced to 850 ℃ the demoulding.It is 850 ℃ annular furnace that the pipe of centrifugal casting is put into preheat temperature, behind the insulation 1h, cools to room temperature with the furnace.Carry out turning processing, reconditioning pipe surfaces externally and internally and former and later two sections at last, and rounding, r
Fillet=12mm.The pipe that obtains preparing.
Second step, heating of pipe blank
Heating of pipe blank adopts the staged mode of heating: at first, pipe put into be preheated to 870 ℃ resistance-heated furnace, to resistance-heated furnace insulation 6h.Pipe is continued to be heated to 1050 ℃ in resistance-heated furnace, the duration of heating process is 0.5h, insulation 1.5h.Pipe inserted in the induction furnace that power is 1250Kw be heated to 1180 ℃, the pipe after obtaining heating.
The 3rd step, pipe lubricate
Pipe is lubricated to comprise lubricated to lubricated, the internal surface of bloom of outer surface of tube blank.Lubricating on the powder platform of shop of described outer surface of tube blank and internal surface of bloom accomplished.Detailed process is:
Lubricating of outer surface of tube blank: the gradient that will spread the powder platform is adjusted 10 °.Glass lubricant-A5 powder through power spreading device even spreading 8mm on the powder platform of shop.Pipe after the heating is placed on shop powder platform one end and makes it on the powder platform of shop, roll a week with glass lubricant-A5 powder fusion, and the rolling speed of pipe is 0.5rad/s.It is the glass-film of 2mm that glass lubricant after the fusion-A5 powder forms thickness at the pipe extexine.
Lubricating of internal surface of bloom: when pipe rolls on the powder platform of shop, utilize spray gun that glass lubricant-A5 powder is coated in the pipe endosexine uniformly, coating thickness is 2mm.
Obtain the pipe after inner surface and outer surface lubricate.
The 4th goes on foot, pipe is pushed
To be fitted on the operative end surface of extrusion die with the ready-made glass isolator of glass lubricant before the extruding, the thickness of said glass isolator is 10mm, and shape is consistent with the operative end surface of extrusion die.
Pipe put into be preheated to 500 ℃ recipient.Through dummy block pipe is pushed.Extrusion process comprises that extruding begins to break through the work zone shaping stage to tubing and stablizes with tubing and extrude the stage.Wherein, extruding begins to rise to 250mm/s to the extrusion speed that tubing is broken through in the shaping stage of work zone by the 0mm/s linearity, and tubing is stable to be extruded the stage and at the uniform velocity push, and its extrusion speed is 250mm/s.The extrusion die that the present invention adopts is a conical die, and modular angle α is 40 °, and calibrating strap length h is 120mm, and inlet fillet r is 10mm.
Obtain hot forming tubing.
The 5th step, tubing post processing
Described tubing post processing comprises aligning, tubing solution treatment, tube surfaces pickling processes, tubing ultrasonic examination and the fine finishining of tubing.
Hot forming tubing is aligned.When hot forming tubing reaches Len req, tubing is cut off.The hot forming tubing that cuts off is put into the annular furnace that is preheated to 1150 ℃ carry out solution treatment, the solution treatment time is 8h, cools to room temperature with the furnace.Hot forming tubing after the solution treatment is carried out surface acid-washing handle and ultrasonic examination, after fine finishining, obtain finished product tubing.
Claims (3)
1. an Inconel690 alloy seamless tubing pecker extrusion forming method is characterized in that, may further comprise the steps:
The first step, pipe preparation
According to tubing inside/outside diameter size and pipe length, and the internal diameter size of recipient, confirm pipe internal diameter, external diameter and length: the pipe external diameter is: D
The pipe external diameter=D
Recipient-(5～20mm); The pipe internal diameter is: D
The pipe internal diameter=D
Pipe internal diameter+ (5～15mm); Pipe length is: L
Pipe=(D
Tube outer diameter 2-D
Pipe internal diameter 2) * L
Tubing÷ (D
The pipe external diameter 2-D
The pipe internal diameter 2)+L
SurplusAdopt the method for centrifugal casting to produce pipe, pouring temperature is 1460-1580 ℃, and rotational speed of casting die is 500～1000r/min, and pouring molten steel speed is 50～200kg/s; Cast finishes, and when treating that the pipe temperature is reduced to 1080 ℃～1100 ℃, reduces rotating speed to 300～500r/min, continues to stop behind the rotation 15-60min; Treat to carry out when the pipe temperature is reduced to 850 ℃ the demoulding; It is 850 ℃ annular furnace that the pipe of centrifugal casting is put into preheat temperature, behind the insulation 1h, cools to room temperature with the furnace; Carry out turning processing, reconditioning pipe surfaces externally and internally and former and later two sections at last, and rounding, r
Fillet=5～12mm; The pipe that obtains preparing;
Second step, heating of pipe blank
Heating of pipe blank adopts the staged mode of heating: at first, pipe put into be preheated to 870 ℃ resistance-heated furnace, to resistance-heated furnace insulation 6h; Pipe is continued to be heated to 1050 ℃ in resistance-heated furnace, the duration of heating process is 0.5h, insulation 1.5h; Pipe inserted in the induction furnace that power is 1250Kw be heated to 1130～1180 ℃, the pipe after obtaining heating;
The 3rd step, pipe lubricate
Pipe is lubricated to comprise lubricated to lubricated, the internal surface of bloom of outer surface of tube blank; Lubricating on the powder platform of shop of described outer surface of tube blank and internal surface of bloom accomplished; Detailed process is:
Lubricating of outer surface of tube blank: the gradient that will spread the powder platform is adjusted 5～10 °; Glass lubricant-A5 powder through power spreading device even spreading 5～8mm on the powder platform of shop; Pipe after the heating is placed on shop powder platform one end and makes it on the powder platform of shop, roll a week with glass lubricant-A5 powder fusion, and the rolling speed of pipe is 0.3～0.5rad/s; It is the glass-film of 1～2mm that glass lubricant after the fusion-A5 powder forms thickness at the pipe extexine;
Lubricating of internal surface of bloom: when pipe rolls on the powder platform of shop, utilize spray gun that glass lubricant-A5 powder is coated in the pipe endosexine uniformly, coating thickness is 1～2mm;
Obtain the pipe after inner surface and outer surface lubricate;
The 4th goes on foot, pipe is pushed
To be fitted on the operative end surface of extrusion die with the ready-made glass isolator of glass lubricant before the extruding; Pipe put into be preheated to 500 ℃ recipient; Through dummy block pipe is pushed; Extrusion process comprises that extruding begins to break through the work zone shaping stage to tubing and stablizes with tubing and extrude the stage; Wherein, extruding begins to rise to 150～250mm/s to the extrusion speed that tubing is broken through in the shaping stage of work zone by the 0mm/s linearity, and tubing is stable to be extruded the stage and at the uniform velocity push, and its extrusion speed is 150～250mm/s; Obtain hot forming tubing;
The 5th step, tubing post processing
Described tubing post processing comprises aligning, tubing solution treatment, tube surfaces pickling processes, tubing ultrasonic examination and the fine finishining of tubing;
Hot forming tubing is aligned; When hot forming tubing reaches Len req, tubing is cut off; The hot forming tubing that cuts off is put into the annular furnace that is preheated to 1080～1150 ℃ carry out solution treatment, the solution treatment time is 5～8h, cools to room temperature with the furnace; Hot forming tubing after the solution treatment is carried out surface acid-washing handle and ultrasonic examination, after fine finishining, obtain finished product tubing.
2. a kind of according to claim 1 Inconel690 alloy seamless tubing pecker extrusion forming method is characterized in that the thickness of said glass isolator is 5～10mm, and shape is consistent with the operative end surface of extrusion die.
3. a kind of according to claim 1 Inconel690 alloy seamless tubing pecker extrusion forming method is characterized in that, extrusion die adopts conical die, and modular angle α is 30～40 °, and calibrating strap length h is 90～120mm, and inlet fillet r is 5～10mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110291203A CN102327919A (en) | 2011-09-29 | 2011-09-29 | Extrusion forming method for hole forming pin for Incone1690 alloy for seamless pipe |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201110291203A CN102327919A (en) | 2011-09-29 | 2011-09-29 | Extrusion forming method for hole forming pin for Incone1690 alloy for seamless pipe |
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Cited By (15)
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| CN103056182A (en) * | 2013-01-24 | 2013-04-24 | 太原科技大学 | Method for producing heavy-caliber thick-walled seamless steel pipe by casting extrusion composite molding |
| CN103219459A (en) * | 2013-04-28 | 2013-07-24 | 宁夏东方钽业股份有限公司 | Superconducting niobium pipe and preparation method thereof |
| CN103343261A (en) * | 2013-06-28 | 2013-10-09 | 江苏双勤民生冶化设备制造有限公司 | Centrifugal casting method for Inconel 600 alloy pipe |
| WO2014187137A1 (en) * | 2013-05-23 | 2014-11-27 | 苏州贝思特金属制品有限公司 | Nickel-copper alloy seamless tube |
| CN104476128A (en) * | 2014-11-21 | 2015-04-01 | 西安邦信特种金属材料科技有限公司 | Method of manufacturing high-temperature alloy pipe blanks |
| CN106216415A (en) * | 2016-07-24 | 2016-12-14 | 钢铁研究总院 | Improve large-sized heavy-wall tube vertical thermal extrusion process evenness of wall thickness method |
| CN109693083A (en) * | 2019-02-20 | 2019-04-30 | 中国兵器工业第五九研究所 | A kind of plastic molding method of big L/D ratio titanium alloy shell |
| CN109940143A (en) * | 2017-12-20 | 2019-06-28 | 李泳澎 | A kind of centre spinning method of Inconel601 compo pipe |
| CN110116143A (en) * | 2019-04-29 | 2019-08-13 | 浙江久立特材科技股份有限公司 | A kind of small-bore thick-wall seamless of hot extrusion molding |
| CN111234863A (en) * | 2018-11-28 | 2020-06-05 | 无锡市新峰管业有限公司 | Forming process of slag oil fluidized bed hydrocracking alloy pipe fitting |
| CN112758186A (en) * | 2020-12-28 | 2021-05-07 | 湖南大学 | Aluminum alloy variable-speed extrusion-molded automobile front longitudinal beam, automobile and manufacturing method of front longitudinal beam |
| CN112756474A (en) * | 2020-12-18 | 2021-05-07 | 南京工程学院 | Preparation method of GH4700 nickel-based superalloy seamless tube blank |
| CN113182373A (en) * | 2021-05-18 | 2021-07-30 | 山西太钢不锈钢股份有限公司 | Extrusion method of nickel-based alloy seamless steel pipe |
| CN114367612A (en) * | 2020-10-15 | 2022-04-19 | 中国科学院金属研究所 | Forging method of alloy bar for 700-DEG C-grade ultra-supercritical unit |
| CN117181972A (en) * | 2023-08-29 | 2023-12-08 | 西安西部新锆科技股份有限公司 | Preparation method of large-specification high-temperature alloy long-neck flange pipe |
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| CN103056182A (en) * | 2013-01-24 | 2013-04-24 | 太原科技大学 | Method for producing heavy-caliber thick-walled seamless steel pipe by casting extrusion composite molding |
| CN103219459A (en) * | 2013-04-28 | 2013-07-24 | 宁夏东方钽业股份有限公司 | Superconducting niobium pipe and preparation method thereof |
| CN103219459B (en) * | 2013-04-28 | 2015-12-09 | 宁夏东方钽业股份有限公司 | Niobium Superconducting pipe and preparation method thereof |
| WO2014187137A1 (en) * | 2013-05-23 | 2014-11-27 | 苏州贝思特金属制品有限公司 | Nickel-copper alloy seamless tube |
| CN103343261A (en) * | 2013-06-28 | 2013-10-09 | 江苏双勤民生冶化设备制造有限公司 | Centrifugal casting method for Inconel 600 alloy pipe |
| CN103343261B (en) * | 2013-06-28 | 2014-02-12 | 江苏双勤民生冶化设备制造有限公司 | Centrifugal casting method for Inconel 600 alloy pipe |
| CN104476128A (en) * | 2014-11-21 | 2015-04-01 | 西安邦信特种金属材料科技有限公司 | Method of manufacturing high-temperature alloy pipe blanks |
| CN106216415A (en) * | 2016-07-24 | 2016-12-14 | 钢铁研究总院 | Improve large-sized heavy-wall tube vertical thermal extrusion process evenness of wall thickness method |
| CN109940143A (en) * | 2017-12-20 | 2019-06-28 | 李泳澎 | A kind of centre spinning method of Inconel601 compo pipe |
| CN111234863B (en) * | 2018-11-28 | 2021-09-17 | 无锡市新峰管业有限公司 | Forming process of slag oil fluidized bed hydrocracking alloy pipe fitting |
| CN111234863A (en) * | 2018-11-28 | 2020-06-05 | 无锡市新峰管业有限公司 | Forming process of slag oil fluidized bed hydrocracking alloy pipe fitting |
| CN109693083A (en) * | 2019-02-20 | 2019-04-30 | 中国兵器工业第五九研究所 | A kind of plastic molding method of big L/D ratio titanium alloy shell |
| CN109693083B (en) * | 2019-02-20 | 2021-09-28 | 中国兵器工业第五九研究所 | Plastic forming method of titanium alloy shell with large length-diameter ratio |
| CN110116143A (en) * | 2019-04-29 | 2019-08-13 | 浙江久立特材科技股份有限公司 | A kind of small-bore thick-wall seamless of hot extrusion molding |
| CN114367612A (en) * | 2020-10-15 | 2022-04-19 | 中国科学院金属研究所 | Forging method of alloy bar for 700-DEG C-grade ultra-supercritical unit |
| CN112756474A (en) * | 2020-12-18 | 2021-05-07 | 南京工程学院 | Preparation method of GH4700 nickel-based superalloy seamless tube blank |
| CN112758186A (en) * | 2020-12-28 | 2021-05-07 | 湖南大学 | Aluminum alloy variable-speed extrusion-molded automobile front longitudinal beam, automobile and manufacturing method of front longitudinal beam |
| CN113182373A (en) * | 2021-05-18 | 2021-07-30 | 山西太钢不锈钢股份有限公司 | Extrusion method of nickel-based alloy seamless steel pipe |
| CN113182373B (en) * | 2021-05-18 | 2023-05-09 | 山西太钢不锈钢股份有限公司 | Extrusion method of nickel-based alloy seamless steel tube |
| CN117181972A (en) * | 2023-08-29 | 2023-12-08 | 西安西部新锆科技股份有限公司 | Preparation method of large-specification high-temperature alloy long-neck flange pipe |
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