CN102527766A - Manufacture method for high-alloy seamless pipe - Google Patents
Manufacture method for high-alloy seamless pipe Download PDFInfo
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- CN102527766A CN102527766A CN2011103326502A CN201110332650A CN102527766A CN 102527766 A CN102527766 A CN 102527766A CN 2011103326502 A CN2011103326502 A CN 2011103326502A CN 201110332650 A CN201110332650 A CN 201110332650A CN 102527766 A CN102527766 A CN 102527766A
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- seamless pipe
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Abstract
The invention discloses a manufacture method for a high-alloy seamless pipe, which belongs to the technical field of the seamless pipe. The production technology is as follows: firstly, producing a high-alloy seamless hollow pipe blank by the centrifugal casting technology; then, heating the hollow pipe blank; carrying out hot extrusion to the heated hollow pipe blank on an extruder to form a pierced billet; and carrying out heat treatment and subsequent straightening, finishing and checking on the pierced billet to obtain the high-alloy seamless pipe.
Description
Technical field
The present invention relates to a kind of manufacturing approach of seamless pipe, particularly a kind of manufacturing approach of high-alloy seamless pipe.。
Background technology
At present; The manufacturing process of high-alloy seamless pipe is a lot; For example: pepriodic rolling technology, oblique roll process, continuous rolling process, Forging Technology, extrusion process, top stretching process etc., general technology are and adopt strip plate or forging stock to bore a hole, extend rolling method as raw material.
The high-alloy seamless pipe of alloying element content >=12%; Often have very high-heat strength, under hot conditions, it is very narrow that it can carry out hot worked plastic range; Make the hot piercing in its pair rolling operation very difficult, thereby can only adopt the mode of power auger reaming to form hollow bloom.Adopt this kind mode not only to cause the waste of heart portion expensive alloys material, the difficulty of its machining itself is also high.The manufacturing approach of such high-alloy seamless pipe is at present: blank is earlier through forging or the rolling pole of processing suitable dimension repeatedly; Carry out peeling again; Bore reaming then, form the high-alloy seamless pipe, pass through pair rolling at last or be crushed to the high-alloy seamless pipe.The weak point of said method is: a, recovery rate of iron and lumber recovery are low; B, hot-working difficulty, percent defective is higher; C, production process are more, and the energy consumption expenditure is high with production cost; D, product quality are wayward.The factor of several respects causes integrated cost high.
Summary of the invention
The object of the invention: the manufacturing approach that a kind of high-alloy seamless pipe is provided; It both can effectively shorten the technological process of production; Reduce energy consumption expenditure and production cost, effectively improved lumber recovery and product quality again, adopted manufacturing approach of the present invention can effectively avoid the generation of above-mentioned defective.
Technical scheme of the present invention: a kind of manufacturing approach of high-alloy seamless pipe; At first adopt centrifugal casting technique to produce the high-alloy seamless hollow bloom; Again hollow bloom is heated, then the hollow bloom after the heating is carried out hot extrusion on extruder and form hollow forging, at last hollow forging is heat-treated; And follow-up aligning, finishing, check, can obtain the high-alloy seamless pipe.
Processing step is:
(1) adopts centrifugal casting explained hereafter high-alloy seamless hollow bloom;
(2) hollow bloom is heated;
(3) utilize extruder that the hollow bloom after heating is carried out hot extrusion, form hollow forging;
(4) hollow forging is heat-treated, and follow-up aligning, finishing, check, the high-alloy seamless pipe can be obtained.
In the said step (1); Adopt conventional centrifugal casting technique, produce the high-alloy seamless hollow bloom, and the hollow bloom that makes is carried out surfaces externally and internally and end face machining; Promptly excise the termination of hollow bloom two ends 30～50mm, each 2～3mm of surfaces externally and internally is removed in boring processing in the outer car.
In the said step (1), the high-alloy seamless hollow bloom is meant, the steel alloy of alloying element content in the chemical composition >=12% or alloy seamless hollow bloom, and the pipe material comprises: high-alloy steel, stainless steel, nickel-base alloy.
In the said step (2), carry out the annular furnace preheating earlier, preheat temperature is 800～900 ℃; Carry out the induction furnace heating again, heating-up temperature is 1150～1250 ℃.
Said step (3) is that hollow bloom carries out hot extrusion at 1100～1230 ℃ of entering extruders after lubricating.
Further, in the said step (3), described hollow bloom is lubricated, is to adopt glass dust as lubricant, through particular device the at the uniform velocity surfaces externally and internally and the end face of the hollow bloom of rotation is evenly sprayed glass dust, and glass dust thickness is 0.4～0.8mm.
Further, in the said step (3), hot extrusion process is an extrusion modling, and extruded product is a hollow forging.
Further, in the said step (3), extruding hollow forging specification is: external diameter Ф 76～1200mm, wall thickness 6～180mm.
In the said step (4), select corresponding Technology for Heating Processing according to the hollow forging material, mainly comprise, modifier treatment, solid solution aging, solution hardening etc. are aligned after the heat treatment, check, finishing again, can obtain the high-alloy seamless pipe.
The manufacturing approach of aforesaid a kind of high-alloy seamless pipe has adopted the manufacturing process of " centrifugal casting+hot extrusion ", and operations such as effectively having avoided forging, bore reaming, be rolling has significantly reduced equipment cost and production cost.
The manufacturing approach of aforesaid a kind of high-alloy seamless pipe; Adopt centrifugal casting technique to replace " strand+forging+brill reaming " explained hereafter high-alloy seamless hollow bloom; Can significantly shorten the production cycle of hollow bloom, enhance productivity, and can also effectively improve the lumber recovery of hollow bloom.
Compared with prior art, the present invention adopts " centrifugal casting+hot extrusion " manufacturing approach, can realize following advantage:
A. shortened the technological process of production, removed forging, bored the reaming operation, can effectively reduce equipment cost and production cost, totle drilling cost reduces about 15%, and can significantly enhance productivity;
B. adopt the centrifugal casting hollow bloom, effectively avoided adopting machined to bore reaming difficulty, recovery rate of iron and the low drawback of lumber recovery;
C. hot extrusion technique has other technology incomparable advantage for the production and the end properties of difficulty distortion high-alloy seamless pipe, good quality of product, and percent defective is low;
D. lumber recovery is high, more than 90%.
Description of drawings
Fig. 1 is technological process of production figure of the present invention.
The specific embodiment
Below in conjunction with accompanying drawing and embodiment the present invention is further described:
Embodiment 1: a kind of manufacturing approach of high-alloy seamless pipe, and processing step is following:
1, adopt conventional centrifugal casting technique to produce the high-alloy seamless hollow bloom;
2, because the hollow bloom outer surface after the centrifugal casting has uniform bur, inner surface has very thin slag blanket, and in the 30～50mm of pipe two ends, more slag inclusion is arranged.Therefore at first amputate the termination of two ends 50mm with band saw, adopt the method processing of boring in the outer car to remove inner surface 2.5mm, outer surface 3mm again, carry out service check and whole the flaw detection after the machined according to the situation of slag inclusion.
3, earlier hollow bloom is put into annular furnace and carry out preheating, preheat temperature is 800 ℃, and be 90min preheating time; Again hollow bloom is carried out the induction furnace heating, heating-up temperature is 1150 ℃, and be 60min heat time heating time.
4, before the hot extrusion hollow bloom is lubricated.Adopt glass dust as lubricant, through particular device the at the uniform velocity surfaces externally and internally and the end face of the hollow bloom of rotation are evenly sprayed glass dust, glass dust thickness is 0.4mm.
5, hollow bloom begins hot extrusion at 1100 ℃ of entering extruders, and hot extrusion process is an extrusion modling, and extrusion ratio is 12, and extruded product is a hollow forging.
6, hollow forging is carried out modified heat treatment, align again after the heat treatment, finishing, check, can obtain the high-alloy seamless pipe.
Embodiment 2: a kind of manufacturing approach of high-alloy seamless pipe, and processing step is following:
1, adopt conventional centrifugal casting technique to produce the high-alloy seamless hollow bloom;
2, because the hollow bloom outer surface after the centrifugal casting has uniform bur, inner surface has very thin slag blanket, and in the 30～50mm of pipe two ends, more slag inclusion is arranged.Therefore at first amputate the termination of two ends 40mm with band saw, adopt the method processing of boring in the outer car to remove inner surface 3mm, outer surface 3mm again, carry out service check and whole the flaw detection after the machined according to the situation of slag inclusion.
3, earlier hollow bloom is put into annular furnace and carry out preheating, preheat temperature is 850 ℃, and be 90min preheating time; Again hollow bloom is carried out the induction furnace heating, heating-up temperature is 1200 ℃, and be 50min heat time heating time.
4, before the hot extrusion hollow bloom is lubricated.Adopt glass dust as lubricant, through particular device the at the uniform velocity surfaces externally and internally and the end face of the hollow bloom of rotation are evenly sprayed glass dust, glass dust thickness is 0.6mm.
5, hollow bloom begins hot extrusion at 1180 ℃ of entering extruders, and hot extrusion process is an extrusion modling, and extrusion ratio is 11, and extruded product is a hollow forging.
6, hollow forging is carried out solution hardening heat treatment, align again after the heat treatment, finishing, check, can obtain the high-alloy seamless pipe.
Embodiment 3: a kind of manufacturing approach of high-alloy seamless pipe, and processing step is following:
1, adopt conventional centrifugal casting technique to produce the high-alloy seamless hollow bloom;
2, because the outer surface of tube blank after the centrifugal casting has uniform bur, inner surface has very thin slag blanket, and in the 30～50mm of pipe two ends, more slag inclusion is arranged.Therefore at first fall the termination of two ends 30mm with the band saw hard iron, adopt the method processing of boring in the outer car to remove inner surface 2.5mm, outer surface 3mm again, carry out service check after the machined and integral body is detected a flaw according to the situation of slag inclusion.
3, earlier hollow bloom is put into annular furnace and carry out preheating, preheat temperature is 900 ℃, and be 100min preheating time; Again hollow bloom is carried out the induction furnace heating, heating-up temperature is 1250 ℃, and be 45min heat time heating time.
4, before the hot extrusion hollow bloom is lubricated.Adopt glass dust as lubricant, through particular device the at the uniform velocity surfaces externally and internally and the end face of the hollow bloom of rotation are evenly sprayed glass dust, glass dust thickness is 0.8mm.
5, hollow bloom begins hot extrusion at 1230 ℃ of entering extruders, and hot extrusion process is an extrusion modling, and extrusion ratio is 10, and extruded product is a hollow forging.
6, hollow forging is carried out solid-solution and aging heat treatment, align again after the heat treatment, finishing, check, can obtain the high-alloy seamless pipe.
Claims (9)
1. the manufacturing approach of a high-alloy seamless pipe, it is characterized in that: the processing step of this method is:
Step (1): adopt centrifugal casting technique to produce the high-alloy seamless hollow bloom;
Step (2): hollow bloom is heated;
Step (3): the hollow bloom after utilizing extruder to heating carries out hot extrusion, forms hollow forging;
Step (4): hollow forging is heat-treated, and follow-up aligning, check, finishing, can obtain the high-alloy seamless pipe.
2. the manufacturing approach of a kind of high-alloy seamless pipe according to claim 1; It is characterized in that: in the said step (1); Adopt conventional centrifugal casting technique, produce the high-alloy seamless hollow bloom, and the hollow bloom that makes is carried out surfaces externally and internally and end face machining; Promptly excise the termination of hollow bloom two ends 30～50mm, each 2～3mm of surfaces externally and internally is removed in boring processing in the outer car.
3. the manufacturing approach of a kind of high-alloy seamless pipe according to claim 1; It is characterized in that: in the said step (1); The high-alloy seamless hollow bloom is meant; The steel alloy of alloying element content in the chemical composition >=12% or alloy seamless hollow bloom, the pipe material comprises: high-alloy steel, stainless steel, nickel-base alloy.
4. the manufacturing approach of a kind of high-alloy seamless pipe according to claim 1 is characterized in that: in the said step (2), carry out the annular furnace preheating earlier, preheat temperature is 800～900 ℃; Carry out the induction furnace heating again, heating-up temperature is 1150～1250 ℃.
5. the manufacturing approach of a kind of high-alloy seamless pipe according to claim 1 is characterized in that: said step (3) is that hollow bloom carries out hot extrusion at 1100～1230 ℃ of entering extruders after lubricating.
6. the manufacturing approach of a kind of high-alloy seamless pipe according to claim 5; It is characterized in that: described hollow bloom is lubricated; Be to adopt glass dust as lubricant, through particular device the surfaces externally and internally and the end face of hollow bloom evenly sprayed glass dust, glass dust thickness is 0.4～0.8mm.
7. the manufacturing approach of a kind of high-alloy seamless pipe according to claim 5 is characterized in that: hot extrusion process is an extrusion modling, and extruded product is a hollow forging.
8. the manufacturing approach of a kind of high-alloy seamless pipe according to claim 5 is characterized in that: extruding hollow forging specification is external diameter Ф 76～Ф 1200mm, wall thickness 6～180mm.
9. the manufacturing approach of a kind of high-alloy seamless pipe according to claim 1; It is characterized in that: in the said step (4); Select corresponding Technology for Heating Processing according to hollow forging ectonexine material, mainly comprise, modifier treatment, solid solution aging, solution hardening etc.; Align again after the heat treatment, finishing, check, can obtain the high-alloy seamless pipe.
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| CN2011103326502A CN102527766A (en) | 2011-10-28 | 2011-10-28 | Manufacture method for high-alloy seamless pipe |
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| CN2011103326502A CN102527766A (en) | 2011-10-28 | 2011-10-28 | Manufacture method for high-alloy seamless pipe |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104099545A (en) * | 2014-07-19 | 2014-10-15 | 太原钢铁(集团)有限公司 | Manufacturing method of nickel-based heat-resisting alloy seamless tube |
| CN107008767A (en) * | 2017-03-23 | 2017-08-04 | 浙江久立特材科技股份有限公司 | A kind of Ni-based less-deformable alloy pipe joint hot-working method |
| CN113458176A (en) * | 2021-06-30 | 2021-10-01 | 浙江久立特材科技股份有限公司 | Manufacturing method of high-precision outer hexagonal and inner circular seamless tube with special-shaped cross section for nuclear power |
| CN114101335A (en) * | 2021-11-30 | 2022-03-01 | 成都先进金属材料产业技术研究院股份有限公司 | Method for manufacturing large-caliber double-layer metal composite pipe |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104099545A (en) * | 2014-07-19 | 2014-10-15 | 太原钢铁(集团)有限公司 | Manufacturing method of nickel-based heat-resisting alloy seamless tube |
| CN104099545B (en) * | 2014-07-19 | 2016-04-27 | 太原钢铁(集团)有限公司 | A kind of manufacture method of Refractoloy seamless tube |
| CN107008767A (en) * | 2017-03-23 | 2017-08-04 | 浙江久立特材科技股份有限公司 | A kind of Ni-based less-deformable alloy pipe joint hot-working method |
| CN113458176A (en) * | 2021-06-30 | 2021-10-01 | 浙江久立特材科技股份有限公司 | Manufacturing method of high-precision outer hexagonal and inner circular seamless tube with special-shaped cross section for nuclear power |
| CN113458176B (en) * | 2021-06-30 | 2023-06-27 | 浙江久立特材科技股份有限公司 | Manufacturing method of high-precision seamless tube with outer hexagonal and inner circular special-shaped cross section for nuclear power |
| CN114101335A (en) * | 2021-11-30 | 2022-03-01 | 成都先进金属材料产业技术研究院股份有限公司 | Method for manufacturing large-caliber double-layer metal composite pipe |
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Application publication date: 20120704 |