CN110394375A - A kind of ellipse method of manufacturing seamless steel pipe - Google Patents
A kind of ellipse method of manufacturing seamless steel pipe Download PDFInfo
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- CN110394375A CN110394375A CN201910738975.7A CN201910738975A CN110394375A CN 110394375 A CN110394375 A CN 110394375A CN 201910738975 A CN201910738975 A CN 201910738975A CN 110394375 A CN110394375 A CN 110394375A
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- cold
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- steel pipe
- seamless steel
- manufacturing seamless
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C37/00—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
- B21C37/06—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of tubes or metal hoses; Combined procedures for making tubes, e.g. for making multi-wall tubes
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- Heat Treatment Of Steel (AREA)
- Heat Treatment Of Articles (AREA)
- Metal Extraction Processes (AREA)
Abstract
The present invention provides a kind of oval method of manufacturing seamless steel pipe, including the cold working of intermediate product, final cold-drawn, finished product heat treatment and straightening processing process；Cold rolling processing is carried out to round tube hollow forging in intermediate product cold working, the ratio of the final cold rolling round tube outer diameter D 0 and diameter D1 of elliptical tube long axis direction is controlled in 1.10-1.50；In final cold-drawn process, using empty sinking or with core diameter cold-drawn by intermediate round tube cold-drawn at elliptical tube, cold-drawn speed is 1.0~10.0m/min；Finished product heat treatment is carried out using black annealing or bright annealing, 1050-1100 DEG C of annealing temperature, soaking time is determined according to oval thickness of pipe wall WT1, and soaking time is (1.0-3.0) * WT1 min/mm.This method has the advantages that with short production cycle, yields is high, and structure size and surface quality meet technical requirements in elliptical tube cold-drawing forming process.
Description
Technical field
The present invention relates to metallurgical technology field more particularly to a kind of oval method of manufacturing seamless steel pipe.
Background technique
The normal residual heat removal exchanger of nuclear power (normal remaining row) is one of nuclear island residual heat removal system key equipment.Nuclear power
Stand normal shutdown maintenance or accident conditions under emergency shut-down when, it is necessary to using residual heat removal system by reactor waste heat arrange
Out, so that reactor core is fully cooled, it is ensured that safe shutdown.Fukushima nuclear accident main causes in 2011 are precisely due to accident work
Under condition, reactor waste fails to be discharged in time, and reactor temperature, which constantly increases, causes reactor core to melt, and fuel canning material is melting
The a large amount of hydrogen of generation are reacted with water under state to cause to explode.
There is the stainless steel heat exchange tube layered arrangement of nearly more than 1,000 wall thickness only 1.24mm or so in every normal remaining row, in work
Under the conditions of condition, heat exchanger tube bears the impact of high temperature and pressure water flow, is constrained if not exchanging heat pipe, rushes in high temperature and pressure water flow
Hitting between lower a large amount of heat exchanger tube can vibrate, and cause mutually collision, abrasion and the abrasion between support plate, be easy to lead
Heat exchanger tube fracture failure is caused to lead to nuclear accident so that residual heat removal system be caused to fail.The main work of elliptical tube anti-vibration strip
With being exactly to prevent heat exchanger tube from vibration, collision and abrasion occurring under operating condition, it is ensured that normal remaining row safely and effectively work, therefore it is oval
Pipe is also important one of the nuclear safety component of nuclear power station, the mechanical property and dimension precision requirement to stainless steel elliptical tube compared with
It is high.
Technical solution
The present invention provides a kind of oval method of manufacturing seamless steel pipe, have the advantages that with short production cycle, yields is high, oval
Structure size and surface quality meet technical requirements in pipe cold-drawing forming process.
In order to reach the purpose, the present invention adopts the following technical scheme:
A kind of ellipse method of manufacturing seamless steel pipe, which is characterized in that at the cold working of intermediate product, final cold-drawn, finished product heat
Reason and straightening processing process, in which:
Cold rolling processing, final cold rolling round tube outer diameter D 0 and elliptical tube long axis direction are carried out to round tube hollow forging in intermediate product cold working
The ratio of diameter D1 is controlled in 1.10-1.50；
In final cold-drawn process, using empty sinking or with core diameter cold-drawn by intermediate round tube cold-drawn at elliptical tube, cold-drawn speed is 1.0~
10.0m/min；
Finished product heat treatment is carried out using black annealing or bright annealing, 1050-1100 DEG C of annealing temperature, soaking time is according to elliptical tube
Wall thickness WT1 determines that soaking time is (1.0-3.0) * WT1 min/mm.
As a preference, providing the hollow forging using hot piercing, the hollow forging is aligned, pickling, surface inspection
It is handled with reconditioning.
As a preference, carrying out processing of taking the lead after the hollow forging aligning, occipital maximum outside diameter of taking the lead is no more than ellipse
The diameter of round tube short-axis direction.
As a preference, the cold-rolling treatment of two passages is at least carried out in intermediate product cold working, to each passage cold-rolling treatment
Round tube carries out black annealing or bright annealing heat treatment.
As a preference, cold-drawn mould workspace surface roughness Ra is no more than 0.2um, cold-drawn in final cold-drawn process
Die deformation section cone angle is not less than 8 °, and cold-drawn outer mold sizing segment length is not less than 1.0mm.
As a preference, carrying out solution treatment, protection using protective atmosphere bright annealing furnace in finished product heat treatment procedure
Atmosphere is hydrogen, and purity is greater than 99.95%, gas source dew point≤50 DEG C of ﹣, and grain size control is in 5.0-7.0 in finished product heat treatment process
Grade.
As a preference, carrying out plane aligning using plain-barreled roll method for gag press straightening in straightening processing process.
As a preference, elliptical tube stainless steel is TP304L austenitic stainless steel.
Beneficial effect
The present invention has the advantages that the ellipse seamless steel pipe dimensional accuracy is high, flatness is small, grain size is controlled in 5.0-7.0
Grade, excellent in mechanical performance, surface quality are good；Elliptical tube cold-drawn processing technology is added using cold rolling to hollow forging, by cold rolling round tube
Diameter and wall thickness control realize the dimensional accuracy and surface quality requirements of cold drawn forming elliptical tube.
Embodiments of the present invention
The present invention is further explained in the light of specific embodiments.
A kind of oval method of manufacturing seamless steel pipe provided by the invention, oval Steel tube standard size are as follows: major diameter
18.67 ± 0.1mm, 24.05 ± 0.25mm of major diameter, parallel-segment 3 ± 0.3mm of wall thickness, 3 ± 0.3mm of arc section wall thickness.It is adopted
With TP304L austenitic stainless steel, the chemical component of TP304L Stainless pipe billet should meet ASTM A213 or GB 13296-2013
Respective specified in standard.It the described method comprises the following steps:
1) hot-working
TP304L hollow forging is made using hot piercing method, hollow forging specification is φ 78*8mm, carries out surface inspection after hollow forging aligning, pickling
It looks into and is handled with reconditioning, it is ensured that there is no the defects for influencing subsequent cold working to exist on surface.
2) intermediate tube cold working and heat treatment
Using large deformation cold-rolling process, intermediate tube cold deformation passage is as shown in table 1.
1 cold deformation passage of table
In the operation of rolling surfaces externally and internally must sufficient lubrication, by Zhi Jinhang outer surface quality inspection in the operation of rolling, surfaces externally and internally is not
There must be crackle, fold, run over and injure, the rolling defects such as load mould.27 ± 0.10mm of final cold rolling finished product pipe outside diameter and tolerance, wall thickness and public affairs
Poor 3.0 ± 0.15mm.Final cold rolling finished product pipe outside diameter is greater than elliptical tube long axis direction diameter, to guarantee that long axis aspect can be filled out
It is full of, while surface being avoided to pull.Final cold rolling round tube wall thickness and oval thickness of pipe wall are substantially suitable.
The annealing of φ 45*5mm and φ 27*3mm intermediate tube is all made of black annealing, and 1080 DEG C of annealing temperature, soaking time is distinguished
For 15min and 9min.Annealing should be dissolved sufficiently, it is ensured that and intermediate tube has relatively low intensity and preferable elongation percentage, so that
Final cold-drawn can be gone on smoothly, and be unlikely to surface occur because intensity is excessively high to pull phenomenon.
After annealing aligning, pickling, it is ensured that surface non-scale, it is residual acid, peracid phenomena such as exist.Round tube blank is after aligning
Surface is checked, must not with the presence of crackle, folding, load mould, damaging etc. influences the major defect of subsequent product quality.Aligning
After take the lead processing, occipital maximum outside diameter of taking the lead is no more than the diameter of elliptical tube short-axis direction, and to ensure to take the lead, position can be suitable
Benefit passes through cold drawing die.
3) finished product cold-drawn
φ 27*3mm intermediate tube is cold drawing to 24*18mm elliptical tube, and relative deformation 15% or so, using dedicated cold in Cold Drawing Process
Pull out lubricating oil continuous lubrication, cold-drawn speed 6m/min.It avoids generating surface and pull and bounce, in order to avoid influence final finished
Surface quality combines production efficiency.Oval pipe size is as shown in table 2 after cold-drawn.
The final cold-drawn forming of elliptical tube carries out empty sinking or with core diameter cold-drawn.Cold drawing die uses wolfram steel mold, cold drawing die
Deformation section cone angle is not less than 12 °, and cold-drawn mould workspace surface roughness Ra is no more than 0.2um, cold-drawn outer mold sizing segment length
Not less than 2mm.It need to consider certain springback capacity, usually consider by the 0.05%~0.5% of finished size.
The oval pipe size (mm) of table 2
4) finished product heat treatment and aligning
Finished product, which is heat-treated, uses the progress solution treatment of protective atmosphere bright annealing furnace, and 1080 DEG C of set temperature, soaking time 6min,
Protective atmosphere is hydrogen, and purity is greater than 99.95%, gas source dew point≤- 50 DEG C.It is dissolved in heat treatment process sufficiently, even tissue,
Grain size is controlled at 5.0-7.0 grades.Ensure finished product tubing mechanical property with higher, and pipe inner and outer surfaces do not aoxidize
Metachromatism guarantees that tubing has preferable surface quality.
Tubing is mainly bent along short axle aspect after heat treatment, carries out plane aligning using plain-barreled roll gag press straightening technology.It rectifys
Do not allow to have phenomena such as excessive aligning, load mould, damage during straight, reconditioning processing need to be carried out to surface defect position.
Production tube sampling carries out microstructure and mechanical property detection.Production tube grain size is 7.0 grades, meets technical conditions regulation
Grain size be greater than 4.0 grades of requirement.Room-temperature mechanical property is as shown in table 3, meets technical conditions requirement.
3 elliptical tube finished product room-temperature mechanical property of table
Described above is only explanation of the invention, so that those of ordinary skill in the art's can completely implements this programme, but
It is not limitation of the present invention, those skilled in the art can according to need after reading this specification and do to the present embodiment
It haunts the modification of creative contribution, these are all without creative modification, but as long as in claim model of the invention
All by the protection of Patent Law in enclosing.
Claims (8)
1. a kind of ellipse method of manufacturing seamless steel pipe, which is characterized in that including the cold working of intermediate product, final cold-drawn, finished product heat
Processing and straightening processing process, in which:
Cold rolling processing, final cold rolling round tube outer diameter D 0 and elliptical tube long axis direction are carried out to round tube hollow forging in intermediate product cold working
The ratio of diameter D1 is controlled in 1.10-1.50；
In final cold-drawn process, using empty sinking or with core diameter cold-drawn by intermediate round tube cold-drawn at elliptical tube, cold-drawn speed is 1.0~
10.0m/min；
Finished product heat treatment is carried out using black annealing or bright annealing, 1050-1100 DEG C of annealing temperature, soaking time is according to elliptical tube
Wall thickness WT1 determines that soaking time is WT1* (1.0~3.0) min/mm.
2. a kind of oval method of manufacturing seamless steel pipe according to claim 1, it is characterised in that: provided using hot piercing
The hollow forging is aligned the hollow forging, pickling, surface inspection and reconditioning processing.
3. a kind of oval method of manufacturing seamless steel pipe according to claim 2, it is characterised in that: after the hollow forging aligning
Processing of taking the lead is carried out, occipital maximum outside diameter of taking the lead is no more than the diameter of elliptical tube short-axis direction.
4. a kind of oval method of manufacturing seamless steel pipe according to claim 1, it is characterised in that: in intermediate product cold working
The cold-rolling treatment at least carrying out two passages carries out black annealing to each passage cold-rolling treatment round tube or bright annealing is heat-treated.
5. a kind of oval method of manufacturing seamless steel pipe according to claim 1, it is characterised in that: final cold-drawn process
In, cold-drawn mould workspace surface roughness Ra is no more than 0.40um, and cold drawing die deformation section cone angle is not less than 8 °, cold-drawn outer mold
Sizing segment length is not less than 1.0mm.
6. a kind of oval method of manufacturing seamless steel pipe according to claim 1, it is characterised in that: finished product heat treatment procedure
Middle to carry out solution treatment using protective atmosphere bright annealing furnace, protective atmosphere is hydrogen, and purity is greater than 99.95%, gas source dew point
50 DEG C of≤﹣, grain size control is at 5.0-8.0 grades in finished product heat treatment process.
7. a kind of oval method of manufacturing seamless steel pipe according to claim 1, it is characterised in that: straightening processing process
In, plane aligning is carried out using plain-barreled roll method for gag press straightening, in case of distorting, pulling force aligning can be used and carry out straightening.
8. a kind of oval method of manufacturing seamless steel pipe according to claim 1, it is characterised in that: elliptical tube stainless steel is
Austenitic stainless steel is equally applicable to the corrosion resistant alloy and high temperature alloy of ferritic stainless steel and austenite structure.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910738975.7A CN110394375B (en) | 2019-08-12 | 2019-08-12 | Manufacturing method of oval seamless steel tube |
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| CN201910738975.7A CN110394375B (en) | 2019-08-12 | 2019-08-12 | Manufacturing method of oval seamless steel tube |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114669623A (en) * | 2022-03-03 | 2022-06-28 | 合肥聚能电物理高技术开发有限公司 | Forming method of thin-wall nonmagnetic stainless steel vacuum pipeline with elliptical section |
| WO2023272609A1 (en) * | 2021-06-30 | 2023-01-05 | 浙江久立特材科技股份有限公司 | High-precision seamless pipe having special-shaped hexagonal cross-section with circle inside for use in nuclear power and manufacturing method therefor |
| WO2023168884A1 (en) * | 2022-03-07 | 2023-09-14 | 江苏银环精密钢管有限公司 | Method for preparing spiral heat exchange tube of steam generator of high temperature gas-cooled reactor |
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| US3546916A (en) * | 1967-10-11 | 1970-12-15 | Dainichinihon Densen Kk | Elliptic wave-guide and method of fabricating it |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023272609A1 (en) * | 2021-06-30 | 2023-01-05 | 浙江久立特材科技股份有限公司 | High-precision seamless pipe having special-shaped hexagonal cross-section with circle inside for use in nuclear power and manufacturing method therefor |
| CN114669623A (en) * | 2022-03-03 | 2022-06-28 | 合肥聚能电物理高技术开发有限公司 | Forming method of thin-wall nonmagnetic stainless steel vacuum pipeline with elliptical section |
| WO2023168884A1 (en) * | 2022-03-07 | 2023-09-14 | 江苏银环精密钢管有限公司 | Method for preparing spiral heat exchange tube of steam generator of high temperature gas-cooled reactor |
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| CN110394375B (en) | 2021-06-04 |
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