CN1360979A - Inner wall quality controlling method for fine seamless alloy tube - Google Patents
Inner wall quality controlling method for fine seamless alloy tube Download PDFInfo
- Publication number
- CN1360979A CN1360979A CN 00136020 CN00136020A CN1360979A CN 1360979 A CN1360979 A CN 1360979A CN 00136020 CN00136020 CN 00136020 CN 00136020 A CN00136020 A CN 00136020A CN 1360979 A CN1360979 A CN 1360979A
- Authority
- CN
- China
- Prior art keywords
- tube
- wall
- pipe
- wall quality
- alloy tube
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 229910045601 alloy Inorganic materials 0.000 title claims abstract description 13
- 239000000956 alloy Substances 0.000 title claims abstract description 13
- 238000000034 method Methods 0.000 title abstract description 23
- 238000003908 quality control method Methods 0.000 claims abstract description 3
- 238000005096 rolling process Methods 0.000 claims description 13
- 238000005242 forging Methods 0.000 claims description 4
- 238000005097 cold rolling Methods 0.000 abstract description 5
- 238000005553 drilling Methods 0.000 abstract description 3
- 238000003754 machining Methods 0.000 abstract 1
- 238000005452 bending Methods 0.000 description 4
- 238000010622 cold drawing Methods 0.000 description 4
- 230000007547 defect Effects 0.000 description 4
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 2
- 238000000137 annealing Methods 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 238000006073 displacement reaction Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 238000007689 inspection Methods 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 230000003746 surface roughness Effects 0.000 description 2
- 230000037303 wrinkles Effects 0.000 description 2
- 238000003723 Smelting Methods 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 229910052786 argon Inorganic materials 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 230000001934 delay Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 238000000265 homogenisation Methods 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000005204 segregation Methods 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 235000013619 trace mineral Nutrition 0.000 description 1
- 239000011573 trace mineral Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Landscapes
- Control Of Metal Rolling (AREA)
- Heat Treatment Of Steel (AREA)
Abstract
The present invention relates to the inner wall quality control of seamless alloy tube, especially of one kind of fine seamless alloy tube. The operation includes the steps of: forgning alloy rod, machining, drilling hole to form tube blank, cold rolling in Nos.60,30,15,12 and 8 roller successively, and final empty sinking. The said process can raise the inner wall quality of fine seamless tube and no hot piercing results in less product deformation and greatly raise product quality.
Description
The invention relatesto an alloy seamless tube, in particular to a method for controlling the quality of the inner wall of a thin-diameter alloy seamless tube.
In the prior art, the conventional pipe processing route often adopts: hot perforation → cold rolling → cold drawing to the finished pipe, especially to the small diameter thin pipe, generally using the cold drawing method to finish, the minimum size of the cold rolled pipe of this process route is above phi 6mm, then finish through the cold drawing of multiple passes, for the finished pipe diameter of phi 3mm, from phi 6mm to phi 3mm, need to draw and can reach phi 3 mm's finished size through the multipass, this kind of process has the problem that the inner surface of the pipe is in the free state in the deformation process, under the deformation state that the reducing diameter of multipass from phi 6mm to phi 3mm does not reduce the wall thickness, will make the inner surface wrinkle inevitably, the result causes the pipe diameter inner circle to be in the tooth form state, and can't reach the index requirement; meanwhile, the stress-strain analysis result in the seamless pipe blank drawing process shows that the deformation is more and more uneven when the blank drawing passes are more under the condition that the total deformation is the same. The deformation caused by drawing is not uniform in the cross section of the seamless pipe. The uneven degree is closely related to the drawing process, even if the total deformation is the same, the uneven degree of deformation is different in different drawing processes, namely the highest equivalent strain of the inner wall of the double-pass empty drawing process is far greater than the highest equivalent strain near the inner wall of the single-pass empty drawing process.
In order to overcome the defects, the invention aims toprovide a method for controlling the quality of the inner wall of the thin-diameter alloy seamless pipe, which can improve the quality of the inner wall of the thin-diameter seamless pipe.
In order to achieve the purpose, the technical scheme of the invention is as follows:
aiming at controlling the quality of the inner wall of the small-diameter pipe, the operation steps are as follows: the alloy forging round bar is machined and drilled into a tube blank, then is cold rolled on 60, 30, 15, 12 and 8 rolling mills, and finally adopts a secondary empty drawing.
Compared with the prior art, the invention has the following advantages:
the tube blank is prepared by drilling, multi-pass cold rolling is mainly adopted, and the high inner wall quality can be obtained by only once empty drawing process, and the roughness of the inner wall of the thin tube is not more than 2 mu m. However, the conventional hot piercing or extruding tube blank adopts the cold rolling and cold drawing combined method to produce the thin-diameter tube, so that the production efficiency is higher, but the roughness of the inner wall of the thin tube is larger than that of the invention. Furthermore, the thermal perforation has large deformation influence on the performance of the pipe and delays the subsequent process, so that the quality of the inner wall is lower.
The present invention will be described in further detail with reference to examples.
The steel for experiment is processed by low segregation homogenization technology, the content of trace elements is adjusted and controlled, a vacuum induction furnace is adopted for smelting and casting to form a 20-25kg spindle, and a steel ingot is mechanically scalped, heated and forged into a round bar with phi 65 through threefires.
Heating specification of the ingot: the heating temperature is 1150 DEG C
The forging temperature is 1100 ℃ and 1120 DEG C
The temperature of stop forging is 850 DEG C
The round bar with phi of 65mm is machined and drilled into a tube blank with phi of 57mm multiplied by 11mm, so that the artificial defects in the rolling process can be eliminated, meanwhile, the defects of looseness and the like in the interior of the tube blank can be eliminated by drilling the central hole, and the method is very favorable for ensuring the quality of the finished tube.
The specific cold rolling process comprises the following steps:
1. on a 60-rolling mill, the rolling process comprises the following steps:
Φ57mm×11mm→Φ52mm×10mm→Φ48mm×9mm→Φ46mm×
2. on a 30-roller mill, the rolling process comprises the following steps:
Φ34mm×5mm→Φ31mm×4.6mm→Φ28mm×4.2mm→
Φ25mm×3.7mm→Φ22mm×3.2mm→Φ19mm×2.8mm→
3. the rolling process on a 15-rolling mill comprises the following steps:
Φ17mm×2.4mm→Φ15mm×2.1mm→Φ13mm×1.8mm→
4. rolling process on 12-mill：
5. The rolling process on a phi 8 rolling mill comprises the following steps:
6. blank drawing process
The annealing process adopted in the rolling process is 1050 ℃, the temperature is kept for 30 minutes, and the water cooling is carried out. After the tube with the diameter less than 8mm is rolled, vacuum annealing treatment is adopted. The treatment process is 1000 ℃, the temperature is kept for 5-10 minutes, and argon is introduced for cooling.
Randomly selecting samples from the prepared thin-diameter pipes with the three specifications, measuring the outer diameter by using a micrometer, measuring the surface roughness of the inner wall of the thin-diameter pipe by using a contact pin inductance method, checking the tester by using a 2201 type surface roughness inspection recorder, sliding a measuring pin of a sensor along the measured surface, causing the displacement of the measuring pin by the peak valley of the surface profile, enabling the electric quantity of an inductance coil to change by the displacement, recording a signal and drawing a curve, and measuring the profile arithmetic deviation value of the inner wall of the thin pipe: ra is 2 μm (equivalent to 3.2 to 1.6).
Comparative example related:
a special alloy flexible small-diameter pipe in China adopts a low-flow pipe processing technology, and the technical indexes are as follows:
the specification requirement is as follows: phi 3.0mm × 0.5mm, phi 3.0mm × 0.6mm, phi 3.0mm × 0.7mm
Wall thickness tolerance: . + -. 0.5X 8% mm,. + -. 0.6X 8% mm,. + -. 0.7X 8% mm
Tolerance of outer tube diameter: +0.05mm
Tensile property: sigmab≥690MPa，δ≥40％
Bending: meets the bending standard of the stainless steel pipe (bending radius 4d, bending angle 180)
Degree, no cracking, no wrinkle, no shriveling of pipe)
Twisting: twisting for 0-180 degrees within 100mm of the length direction of the pipe repeatedly
Five times of rotation without cracks
Pipe making material: meets the technical index of homogenized alloy
Inner wall roughness: not more than Ra 3.2 μm
Nondestructive flaw detection: qualified and qualified by inspection, meets the requirements (artificial defect is 0.1mm)
Therefore, the requirement of the roughness of the inner wall cannot be met by the general rolling and drawing combined process flow.
Claims (1)
1. A quality control method for the inner wall of a thin-diameter alloy seamless tube is characterized by comprising the following operation steps: the alloy forging round bar is machined and drilled into a tube blank, then is cold-rolled and rolled on 60, 30, 15, 12 and 8 rolling mills in sequence, and finally is subjected to one-time empty drawing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB001360205A CN1172757C (en) | 2000-12-26 | 2000-12-26 | Inner wall quality controlling method for fine seamless alloy tube |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB001360205A CN1172757C (en) | 2000-12-26 | 2000-12-26 | Inner wall quality controlling method for fine seamless alloy tube |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1360979A true CN1360979A (en) | 2002-07-31 |
| CN1172757C CN1172757C (en) | 2004-10-27 |
Family
ID=4597026
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB001360205A Expired - Fee Related CN1172757C (en) | 2000-12-26 | 2000-12-26 | Inner wall quality controlling method for fine seamless alloy tube |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1172757C (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102172822A (en) * | 2011-03-24 | 2011-09-07 | 上海奉贤钢管厂 | Processing technology for high-precision heavy wall pipe |
| CN103934304A (en) * | 2014-04-14 | 2014-07-23 | 重庆钢铁(集团)有限责任公司 | Forming method of precise high-temperature alloy pipe with small caliber and thick wall for aviation |
| CN106019351A (en) * | 2016-07-21 | 2016-10-12 | 中国科学院高能物理研究所 | Extremely-low-noise particle detection system and read-out chip |
| CN112845658A (en) * | 2021-01-05 | 2021-05-28 | 太原科技大学 | Preparation method of UNS N08825 small-caliber precise seamless tube |
-
2000
- 2000-12-26 CN CNB001360205A patent/CN1172757C/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102172822A (en) * | 2011-03-24 | 2011-09-07 | 上海奉贤钢管厂 | Processing technology for high-precision heavy wall pipe |
| CN103934304A (en) * | 2014-04-14 | 2014-07-23 | 重庆钢铁(集团)有限责任公司 | Forming method of precise high-temperature alloy pipe with small caliber and thick wall for aviation |
| CN103934304B (en) * | 2014-04-14 | 2018-04-03 | 重庆钢铁(集团)有限责任公司 | A kind of forming method of the accurate small-diameter thick-walled high temperature alloy pipes of aviation |
| CN106019351A (en) * | 2016-07-21 | 2016-10-12 | 中国科学院高能物理研究所 | Extremely-low-noise particle detection system and read-out chip |
| CN112845658A (en) * | 2021-01-05 | 2021-05-28 | 太原科技大学 | Preparation method of UNS N08825 small-caliber precise seamless tube |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1172757C (en) | 2004-10-27 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103658225B (en) | A kind of non-ferrous metal has seam elbow cooling formation technic | |
| US20220040742A1 (en) | Method for preparing high-performance difficult-to-deform metal precision seamless pipe | |
| JPH0436445A (en) | Production of corrosion resisting seamless titanium alloy tube | |
| CN108160742B (en) | A kind of metastable beta-type titanium alloy TB16 cold rolled tube processing method | |
| CN104889194A (en) | Large-diameter fine-grain anti-rust aluminum alloy thin-walled tube preparation method | |
| CN102233365A (en) | Manufacturing process of small-diameter seamless steel tubes | |
| CN115647107B (en) | Method for improving flattening performance of titanium alloy seamless tube | |
| Abe et al. | Method of evaluating workability in cold pilgering of zirconium alloy tube | |
| CN112756909A (en) | Preparation method of large-caliber Ti35 titanium alloy pipe | |
| CN111530962B (en) | Production method for small-caliber thick-wall titanium alloy seamless pipe | |
| CN1360979A (en) | Inner wall quality controlling method for fine seamless alloy tube | |
| CN108517478A (en) | A kind of manufacturing process of the small-bore accurate pipe of 718 alloy | |
| CN117102273B (en) | Titanium alloy seamless pipe and method for improving rotation bending fatigue performance thereof | |
| CN1508278A (en) | High temperature alloy tube processing method | |
| CN1831411A (en) | Manufacturing method of seamless steel pipe for pressure pipeline | |
| CN112238328A (en) | Preparation method of high-steel-grade Ni-based alloy | |
| CN113458176B (en) | Manufacturing method of high-precision seamless tube with outer hexagonal and inner circular special-shaped cross section for nuclear power | |
| CN108060376A (en) | A kind of abros NS3304 seamless pipes high-yield-ratio, Hi-grade steel control method | |
| CN111496008B (en) | Method for preparing high-precision small-caliber TA2 pipe for spaceflight | |
| KR20000076162A (en) | Method for producing tubing products based on zircon alloys | |
| CN104018067A (en) | High-strength plastic vanadium microalloyed dual-phase steel seamless pipe and preparation method thereof | |
| RU2707376C9 (en) | Method of manufacturing high precision tubing from hafnium | |
| Guillot et al. | Experimental exploration of the aluminum tube drawing process for producing variable wall thickness components used in light structural applications | |
| CN111088419B (en) | Manufacturing method of large-caliber thick-wall seamless hot-pressing elbow of 630 ℃ ultra-supercritical unit G115 and elbow | |
| CN109648266B (en) | Rectangular adjusting nut machining process |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |