CN101811149A - Manufacturing method of high alloy seamless steel tube - Google Patents
Manufacturing method of high alloy seamless steel tube Download PDFInfo
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- CN101811149A CN101811149A CN 201010146152 CN201010146152A CN101811149A CN 101811149 A CN101811149 A CN 101811149A CN 201010146152 CN201010146152 CN 201010146152 CN 201010146152 A CN201010146152 A CN 201010146152A CN 101811149 A CN101811149 A CN 101811149A
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Abstract
The invention discloses a manufacturing method of high alloy seamless steel tube, comprising the following technical steps: (1) producing a high alloy hollow shell with centrifugal casting technology; (2) heating the hollow shell and plugging the opening of the hollow shell when heating; (3) reaming and wall thinning for the hollow shell after being heated by using a perforating machine so as to form a blank; (4) tube rolling for the bland by using a pipe and tube mill so as to form a pierced billet; (5) sizing and reducing for the pierced billet by using a sizing and reducing machine so as to obtain the high alloy seamless steel tube. The blank with the manufacturing method uses centrifugal casting for the hollow shell and lubricant is added by using the characteristic of hollow shell, thereby avoiding the problems of high alloy material in the technologies of forging, rolling and punching such as low metal yield and high rejection rate due to difficult deformation, thereby greatly reducing the manufacturing cost.
Description
Technical field
The present invention relates to a kind of manufacture method of steel pipe, especially a kind of manufacture method of high-alloy seamless steel pipe.
Background technology
Existing manufacturing technology is: the manufacturing process of high-alloy seamless steel pipe is very many, pepriodic rolling technology, top stretching process, extrusion process, continuous rolling process, oblique roll process etc. are arranged, and general technology is and adopts strip plate or forging stock to bore a hole, extend rolling method as raw material.
Analyze the prior art condition: from the angle analysis of deformation characteristics, all technology all can produce high-alloy seamless steel pipe.Wherein, extrusion process is best deformation condition, because this has the characteristics of three-dimensional stress compression, greatly brought into play plastic deformation of metal, be highly suitable for the manufacturing of high-end products such as steel alloy, stainless steel, nickel-base alloy, but because of its manufacturing technical feature causes the metal lumber recovery low, cost is high and have only few local application.Other technologies are applied to produce high-alloy seamless steel pipe on a small quantity, and main cause is to occur defectives such as invagination, crackle in perforation procedure easily.
Summary of the invention
The technical problem to be solved in the present invention provides the manufacture method of a kind of stock utilization height, high-alloy seamless steel pipe that cost is low.
For solving the problems of the technologies described above, the processing step of the inventive method is:
(1), adopt centrifugal casting technique to produce heavy alloyed hollow bloom;
(2), with the opening shutoff of hollow bloom, hollow bloom is heated;
(3), utilizing punch that the hollow bloom after heating is carried out reaming subtracts wall, forms blank;
(4), utilize pipe mill that blank is carried out tube rolling, form hollow forging;
(5), utilize size-reducing mill that hollow forging is carried out deciding tube reducing, can obtain high-alloy seamless steel pipe.
Further, in the described step (1), the hollow bloom that obtains is carried out surfaces externally and internally and end face machining; Described surfaces externally and internally and end face machining are: the termination that at first amputates hollow bloom two ends 30～50mm; Adopt the method processing of boring in the outer car to remove inside and outside each monolateral 3mm again.
Further, described step (2) is: adopt refractory material with two opening shutoff, and put into reducing agent at the blank inner surface, form reducing atmosphere; Then hollow bloom is heated.Described reducing agent is preferably carbon dust, and consumption is 2～6g; Described refractory material is preferably high chrysotile.Preferred heating process is: it is 700～900 ℃ rotary heating furnace that hollow bloom is put into preheat temperature, and be 60～90min preheating time; Be heated to 1050～1200 ℃ then, be 30～60min heat time heating time; At last at 1150～1250 ℃ of soaking zone insulation 20～40min.
Further, in the described step (2), the hollow bloom inner surface after heating is laid glass dust as lubricant.Describedly lay glass dust at the hollow bloom inner surface and be: pour glass dust into the hollow bloom inner surface, glass dust will be paved with inner surface uniformly in the hollow bloom rolling process, glass dust thickness 0.2～0.8mm.
Further, described step (3) is: the hollow bloom after will heating carries out reaming and subtracts wall on Man Shi or cone mill.
Further, described step (4) is: blank enters two rollers or the three-high mill oblique milling extends into hollow forging at 1100～1250 ℃.
Further, in the described step (5), hollow forging enters size-reducing mill at 900～000 ℃ and carries out deciding tube reducing.
Inner surface at blank adds lubricant, improves the lubricating condition of wearing expansion, makes the blank inner surface quality after rolling better; The flexible characteristics of centrifugal casting technique, oblique milling technology are combined with the characteristics of high alloy small batch, many kinds, more highlight the superiority of its production.
Adopt the beneficial effect that technique scheme produced to be: (1), the hollow bloom that adopts centrifugal casting technique to produce are managed raw material as producing, quality obviously is better than the steel ingot base, possess better basic condition, compare with rolling or forging blank, recovery rate of iron height, cost are low; The present invention has given full play to the characteristics of centrifugal manufacturing technology, the hollow bloom dense structure of manufacturing, and punching quality is good.
(2), when heating be the opening shutoff of hollow bloom, can make the iron scale of hollow bloom inner surface less, and operation is simple, require lower to the heating condition of heating furnace; Especially after adding reducing agent, can further reduce the iron scale of hollow bloom inner surface, lower to the heating condition requirement of heating furnace.
(3), the inventive method compares with other technologies, total stock utilization of making high-alloy seamless steel pipe technology improves 10～20%, manufacturing cost reduces more than 10%.
(4), especially after the hollow bloom inner surface adds the glass dust lubricant, can improve the perforation lubricating condition, the defect in inner surface of having avoided perforation to occur easily.
(5), especially after adopting two rollers or roller trio skew rolling technology, manufacturing process is flexible, relatively is suitable for the manufacture characteristic of high alloy small batch, many kinds.
The specific embodiment
The present invention is further detailed explanation below in conjunction with concrete example.
Embodiment 1: the manufacture method of this high-alloy seamless steel pipe adopts following processing step:
1, adopt conventional centrifugal casting technique to produce the high alloy hollow bloom.
2, the surfaces externally and internally of hollow bloom and end face carry out machining.Because the hollow bloom outer surface after the centrifugal casting forms uniform convex belemnoid shape, inner surface has very thin slag blanket, and in the 30～50mm of pipe two ends more slag inclusion is arranged.So, at first remove the termination of two ends 30～50mm with band saw; Adopt the method processing of boring in the outer car to remove inside and outside each monolateral 3mm again; Service check and whole flaw detection are carried out sampling in machined afterwards.Wherein, the termination distance that amputates can amputate the 40mm termination according to how many judgements of slag inclusion in the present embodiment.
3, the hollow bloom after the processing adopts cleaning fluid to carry out surface clean, air-dry, is sprinkled into the carbon dust of 4g then at internal surface of bloom, in order to as reducing agent, adopts high chrysotile to block the two ends hole of hollow bloom at last.
4, hollow bloom is put into the rotary heating furnace of 800 ℃ of preheat temperatures, be 75min preheating time, is heated to 1150 ℃, and be 45min heat time heating time, at 1200 ℃ of soaking zone insulation 30min.
5, take out the high chrysotile that seal at the hollow bloom two ends with cleek, blow clean with high-pressure blast again, glass dust is put into the elongated slot that iron pipe is made, stretch into the hollow bloom endoporus, pour the hollow bloom inner surface into, glass dust will be paved with inner surface uniformly in the hollow bloom rolling process, glass dust thickness 0.5mm, and the glass dust of interpolation will play lubrication.
6, hollow bloom subtracts wall at Man Shi or cone mill UR, forms blank.The percentage elongation that hollow bloom to reaming subtracts behind the wall is 2～4%.
7, blank enters two rollers or three-high mill at 1200 ℃, and blank rotates on milling train and extends into hollow forging, and blank to the percentage elongation of hollow forging is 1.5～2%.
8, hollow forging enters size-reducing mill at 950 ℃, and hollow forging tube reducing on 12 three-roll size reducing mills extends into the fished pipe that needs, and can obtain high-alloy seamless steel pipe.
Embodiment 2: the manufacture method of this high-alloy seamless steel pipe adopts following processing step:
1, adopt conventional centrifugal casting technique to produce the high alloy hollow bloom.
2, the surfaces externally and internally of hollow bloom and end face carry out machining.At first remove the termination at two ends 30 with band saw; Adopt the method processing of boring in the outer car to remove inside and outside each monolateral 3mm again; Service check and whole flaw detection are carried out sampling in machined afterwards.
3, the hollow bloom after the processing adopts cleaning fluid to carry out surface clean, air-dry, is sprinkled into the 6g carbon dust at internal surface of bloom then, in order to as reducing agent, adopts high chrysotile to block the two ends hole of hollow bloom at last.
4, hollow bloom is put into the rotary heating furnace of 900 ℃ of preheat temperatures, be 60min preheating time, is heated to 1200 ℃, and be 30min heat time heating time, at 1250 ℃ of soaking zone insulation 20min.
5, take out the high chrysotile that seal at the hollow bloom two ends with cleek, blow clean with high-pressure blast again, glass dust is put into the elongated slot that iron pipe is made, stretch into the hollow bloom endoporus, pour the hollow bloom inner surface into, glass dust will be paved with inner surface uniformly in the hollow bloom rolling process, glass dust thickness 0.8mm, and the glass dust of interpolation will play lubrication.
6, hollow bloom subtracts wall at Man Shi or cone mill UR, forms blank.The percentage elongation that hollow bloom to reaming subtracts behind the wall is 2～4%.
7, blank enters two rollers or three-high mill at 1250 ℃, and blank rotates on milling train and extends into hollow forging, and blank to the percentage elongation of hollow forging is 1.5～2%.
8, hollow forging enters size-reducing mill at 1000 ℃, and hollow forging tube reducing on 13 three-roll size reducing mills extends into the fished pipe that needs, and can obtain high-alloy seamless steel pipe.
Embodiment 3: the manufacture method of this high-alloy seamless steel pipe adopts following processing step:
1, adopt conventional centrifugal casting technique to produce the high alloy hollow bloom.
2, the surfaces externally and internally of hollow bloom and end face carry out machining.At first remove the termination of two ends 50mm with band saw; Adopt the method processing of boring in the outer car to remove inside and outside each monolateral 3mm again; Service check and whole flaw detection are carried out sampling in machined afterwards.
3, the hollow bloom after the processing adopts cleaning fluid to carry out surface clean, air-dry, is sprinkled into the 2g carbon dust at internal surface of bloom then, in order to as reducing agent, adopts high chrysotile to block the two ends hole of hollow bloom at last.
4, hollow bloom is put into the rotary heating furnace of 700 ℃ of preheat temperatures, be 90min preheating time, is heated to 1050 ℃, and be 60min heat time heating time, at 1150 ℃ of soaking zone insulation 40min.
5, take out the high chrysotile that seal at the hollow bloom two ends with cleek, blow clean with high-pressure blast again, glass dust is put into the elongated slot that iron pipe is made, stretch into the hollow bloom endoporus, pour the hollow bloom inner surface into, glass dust will be paved with inner surface uniformly in the hollow bloom rolling process, glass dust thickness 0.2mm, and the glass dust of interpolation will play lubrication.
6, hollow bloom subtracts wall at Man Shi or cone mill UR, forms blank.The percentage elongation that hollow bloom to reaming subtracts behind the wall is 2～4%.
7, blank enters two rollers or three-high mill at 1100 ℃, and blank rotates on milling train and extends into hollow forging, and blank to the percentage elongation of hollow forging is 1.5～2%.
8, hollow forging enters size-reducing mill at 900 ℃, and hollow forging tube reducing on 14 three-roll size reducing mills extends into the fished pipe that needs, and can obtain high-alloy seamless steel pipe.
Claims (10)
1. the manufacture method of a high-alloy seamless steel pipe is characterized in that, the processing step of this method is:
(1), adopt centrifugal casting technique to produce heavy alloyed hollow bloom;
(2), with the opening shutoff of hollow bloom, hollow bloom is heated;
(3), utilizing punch that the hollow bloom after heating is carried out reaming subtracts wall, forms blank;
(4), utilize pipe mill that blank is carried out tube rolling, form hollow forging;
(5), utilize size-reducing mill that hollow forging is carried out deciding tube reducing, can obtain high-alloy seamless steel pipe.
2. the manufacture method of a kind of high-alloy seamless steel pipe according to claim 1 is characterized in that: in the described step (1), the hollow bloom that obtains is carried out surfaces externally and internally and end face machining; Described surfaces externally and internally and end face machining are: the termination that at first amputates hollow bloom two ends 30～50mm; Adopt the method processing of boring in the outer car to remove inside and outside each monolateral 3mm again.
3. the manufacture method of a kind of high-alloy seamless steel pipe according to claim 1 is characterized in that, described step (2) is: adopt refractory material with two opening shutoff, and put into reducing agent at the blank inner surface, form reducing atmosphere; Then hollow bloom is heated.
4. the manufacture method of a kind of high-alloy seamless steel pipe according to claim 3, it is characterized in that: described reducing agent is a carbon dust, the carbon dust consumption is 2～6g; Described refractory material is high chrysotile.
5. the manufacture method of a kind of high-alloy seamless steel pipe according to claim 1 is characterized in that, the heating process in the described step (2) is: it is 700～900 ℃ rotary heating furnace that hollow bloom is put into preheat temperature, and be 60～90min preheating time; Be heated to 1050～1200 ℃ then, be 30～60min heat time heating time; At last at 1150～1250 ℃ of soaking zone insulation 20～40min.
6. the manufacture method of a kind of high-alloy seamless steel pipe according to claim 1 is characterized in that: in the described step (2), the hollow bloom inner surface after heating is laid glass dust as lubricant.
7. the manufacture method of a kind of high-alloy seamless steel pipe according to claim 6, it is characterized in that, describedly lay glass dust at the hollow bloom inner surface and be: pour glass dust into the hollow bloom inner surface, glass dust will be paved with inner surface uniformly in the hollow bloom rolling process, glass dust thickness 0.2～0.8mm.
8. the manufacture method of a kind of high-alloy seamless steel pipe according to claim 1 is characterized in that, described step (3) is: the hollow bloom after will heating carries out reaming and subtracts wall on Man Shi or cone mill.
9. the manufacture method of a kind of high-alloy seamless steel pipe according to claim 1 is characterized in that, described step (4) is: blank enters two rollers or the three-high mill oblique milling extends into hollow forging at 1100～1250 ℃.
10. according to the manufacture method of described any one high-alloy seamless steel pipe of claim 1-9, it is characterized in that: in the described step (5), hollow forging enters size-reducing mill at 900～1000 ℃ and carries out deciding tube reducing.
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| CN2010101461524A CN101811149B (en) | 2010-04-14 | 2010-04-14 | Manufacturing method of high alloy seamless steel tube |
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| CN2010101461524A CN101811149B (en) | 2010-04-14 | 2010-04-14 | Manufacturing method of high alloy seamless steel tube |
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| CN101811149A true CN101811149A (en) | 2010-08-25 |
| CN101811149B CN101811149B (en) | 2012-05-23 |
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| CN2010101461524A Expired - Fee Related CN101811149B (en) | 2010-04-14 | 2010-04-14 | Manufacturing method of high alloy seamless steel tube |
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| CN101972776A (en) * | 2010-11-04 | 2011-02-16 | 胡顺珍 | Hot rolling production process of automatic tube rolling mill |
| CN102274941A (en) * | 2011-08-15 | 2011-12-14 | 新兴铸管股份有限公司 | Method for making bimetal composite seamless tube with metallurgical bonding layer |
| CN102310184A (en) * | 2011-09-27 | 2012-01-11 | 新兴铸管股份有限公司 | Manufacturing method of wear-resistant composite steel plate and manufactured composite steel plate |
| CN102319764A (en) * | 2011-07-18 | 2012-01-18 | 新兴铸管股份有限公司 | Method for manufacturing stainless steel seamless tube |
| CN102327919A (en) * | 2011-09-29 | 2012-01-25 | 西北工业大学 | Extrusion forming method for hole forming pin for Incone1690 alloy for seamless pipe |
| CN102513400A (en) * | 2011-12-14 | 2012-06-27 | 攀钢集团成都钢钒有限公司 | Method for forging alloy seamless steel pipe by die cast hollow ingot |
| CN102527766A (en) * | 2011-10-28 | 2012-07-04 | 刘建彬 | Manufacture method for high-alloy seamless pipe |
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