CN101829679B - Production method for producing shock toughness of pipe coupling material of hot rolled oil well - Google Patents
Production method for producing shock toughness of pipe coupling material of hot rolled oil well Download PDFInfo
- Publication number
- CN101829679B CN101829679B CN 200910010669 CN200910010669A CN101829679B CN 101829679 B CN101829679 B CN 101829679B CN 200910010669 CN200910010669 CN 200910010669 CN 200910010669 A CN200910010669 A CN 200910010669A CN 101829679 B CN101829679 B CN 101829679B
- Authority
- CN
- China
- Prior art keywords
- temperature
- steel pipe
- rolling
- pipe
- steel pipes
- 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.)
- Active
Links
Landscapes
- Heat Treatment Of Steel (AREA)
Abstract
The invention discloses a production method for producing shock toughness of pipe coupling material of a hot rolled oil well. The method comprises the steps of: heating pipe blanks at the temperature of 1250-1280 DEG C, punching at the temperature of 1200-1250 DEG C, and continuously rolling at the temperature of 980-1100 DEG C; quickly cooling to 850-950 DEG C with water after rolling; and then carrying out temperature equilibrium on steel pipes; pressing the steel pipes subject to temperature equalization in a sizing and reducing rolling mill at the temperature of 40-140 DEG C above Ar3; quickly cooling the steel pipes subjected to sizing to the temperature of Ar1 to 70 DEG C above Ar1; and finally, moving the steel pipes to a cooling bed for air cooling. After being continuously rolledand deformed, the steel pipes are quickly cooled with water to an austenite area with lower temperature to inhibit the growth of the crystallized austenite grains; in addition, the two-stage type cooling is carried out after sizing, the increased stress even deformation in the steel pipes caused by the one-stage type forced cooling of the final rolling can be avoided, the recrystallized austenite, the final ferrite and pearlite are fined, the toughness and strength of the steel pipes are both enhanced and the quality rate of the product is enhanced from 43.6% to more than 99%.
Description
Technical field
The invention belongs to a kind of low-alloy steel manufacturing technology field, relate to a kind of production method of improving hot-rolling oil well casing coupling material impact flexibility.
Background technology
It is the most frequently used method that present oil well pipe connects that box cupling connects, and its used box cupling is usually by the thick-walled seamless steel pipes manufacturing, and this steel pipe also has clear and definite requirement to toughness index except requirement of strength.
The special production technology of hot rolled seamless steel tube has determined that thick-walled pipe impact flexibility is low, can not get the better strength and toughness coupling, and present improvement measure is a kind of to be by the composition adjustment, and the content that improves precious metal reaches; A kind of is to adopt heat treatment method.
Above dual mode all needs higher cost; for reducing cost and reaching the purpose of steel pipe toughness; begin to occur online normalizing technology; it is that the steel pipe temperature that tandem rolling takes off behind the rod is down to below the Ar1 temperature, and austenite is decomposed fully, reheats austenitizing with reheating furnace afterwards; then carry out fixed diameter rolling; utilize recrystallization refine austenite crystal grain, the steel pipe crystal grain of air cooling can improve steel pipe toughness than refinement to some extent in the past behind the sizing like this.For example US Patent No. 5186769, BP GB2101014A, BP GB2137539A; but online normalizing technology is little to improving the steel strength effect; be to improve intensity, cooling velocity behind the quickening sizing occurred, obtain the accelerated cooling process of bainite structure.
Though the cooling of the acceleration behind the sizing obtains the toughness and tenacity that the technology of bainite structure can improve steel pipe, for example Chinese patent 02145363.2, but still have weak point, the one, because the tubing production technology characteristic has determined that the control to the bainite proportion of composing will be the difficult problem in the production, in case the proportion control of upper bainite, lower bainite and granular bainite is improper, the then impact flexibility of steel pipe meeting control breakdown; The 2nd, be as cold as the low-temperature space that bainite structure changes fast from the finishing temperature more than 900 ℃, will in steel pipe, produce very big stress, easily cause tube bending, distortion; The 3rd, because its amount of stored heat is big, be difficult to guarantee the inside and outside cooling of steel pipe evenly for thick-walled pipe, the cooling of inner surface is difficult for reaching the bainite transformation temperature, causes inside and outside tissue odds degree to become big.
Summary of the invention
The object of the present invention is to provide a kind of production method of improving hot-rolling oil well casing coupling material impact flexibility, at oil well pipe coupling material thick-wall seamless rolling mill practice, improve oil well pipe coupling material seamless steel pipe impact flexibility by controlled rolling and control cooling, make under the situation of not losing intensity, improve the impact flexibility of hot rolling coupling material, guarantee that simultaneously steel pipe does not produce defectives such as bending, distortion.
The object of the present invention is achieved like this: a kind of production method of improving hot-rolling oil well casing coupling material impact flexibility, and pipe to be sent in the rotary heating furnace heat, heating and temperature control is at 1250 ℃～1280 ℃; The heating pipe is bored a hole by punch, and the control punch temperature is at 1200 ℃～1250 ℃; Perforation back seamless pipe hollow billet carries out continuous rolling by MPM restraint axle mandrel rolling mill, and the control of steel pipe continuous rolling temperature is carried out at 980 ℃～1100 ℃, and mixed crystal and coarse-grain do not appear in austenite after utilizing that dynamic recrystallization is rolling and making high temperature rolling; The steel pipe tandem rolling takes off pipe back and enters to wear and implement to wear water in the water pipe and be quickly cooled to 850 ℃～950 ℃ temperature ranges, suppresses growing up of recrystallization austenite crystal at once; Realize samming by traversing chain; The steel pipe of tandem rolling directly advances to decide the tube reducing milling train behind the samming, 40 ℃～140 ℃ scopes more than Ar3, namely 750 ℃～850 ℃ of temperature metastable decided the austenitic area and carried out deciding tube reducing finish to gauge, the austenite crystal distortion is elongated, increase the ferrite nucleation rate, the steel pipe temperature is not less than the Ar3 temperature after guaranteeing to decide tube reducing finish to gauge; Decide steel pipe after the tube reducing finish to gauge enter immediately wear wear water cooling in the water pipe or implement steam fog cold soon, through fast steel pipe temperature control after cold at Ar1 point～Ar1 point above 70 ℃, namely 620 ℃～690 ℃, increase the ferrite nucleation rate, obtain tiny axle columnar ferrite such as grade and pearlitic structrure; Steel pipe is sent to walking beam cooler by roller-way after wearing water, in the both sides of cold bed two axial flow blowers are installed respectively, increase cross-ventilation to improve cooling velocity, make the steel pipe behind the sizing be cooled to room temperature with 1 ℃～3 ℃/s speed, further crystal grain thinning, guarantee thick-walled pipe tissue and performance, finally improve the strength and toughness of steel pipe.
The present invention is that seamless pipe is cooled fast to uniform temperature after retained mandrel mandrel rolling mill group (MPM) is rolling, so that slowing down, the small grains that the aximal deformation value of this operation of rolling obtains grows up, and by the water cooling of wearing behind the fixed diameter rolling, improve the degree of supercooling of steel pipe structural transformation, increased the nucleation rate of ferrite and perlitic transformation, further crystal grain thinning, and pearlitic sheet interlayer spacing is reduced, finally make steel pipe obtain the good mechanical performance.Owing to wears water cooling and divide two sections to carry out, and it is air-cooled to have increased cold bed, reasonable distribution cooling capacity, avoided because the strong cold steel pipe internal stress that causes of finish to gauge one-part form increases even is out of shape.
Advantage of the present invention is:
1. by the rolling and cooling of control oil well pipe coupling material, make recrystallization austenite and final ferrite, pearlite refinement, when improving steel pipe toughness, intensity is also had improvement, product percent of pass is increased to more than 99% by 43.6%.
2. be that the patent of CN 1502425A is compared with publication number, innovation part of the present invention is tandem rolling distortion back steel pipe is worn the austenitic area that water is chilled to lower temperature soon, suppresses growing up of recrystallization austenite crystal, realizes samming by traversing chain.And the present invention divides the two-part cooling behind sizing, can avoid because the strong cold steel pipe internal stress that causes of finish to gauge one-part form increases even distortion.Practice result shows, and is obvious to the impact flexibility effect that improves thick-wall seamless.
3. compare with US Patent No. 5186769, BP GB2101014A, BP GB2137539A, the present invention need not be chilled to steel pipe by force below the Ac1 temperature after tandem rolling takes off pipe, need not use the reheating furnace reaustenitizing before sizing finish to gauge yet.And the present invention is remarkable to refinement steel pipe tissue effect, has improved the impact flexibility of thick-walled seamless steel pipes greatly, makes steel pipe have excellent obdurability coupling, by contrast, saves the energy and resource, has simplified production technology.
The specific embodiment
With a kind of chemical component weight percentage be: C:0.24%～0.40%, Si:0.17%～0.60%, Mn:1.30%～1.70%, P≤0.025%, S≤0.010%, Ti:0.010%～0.030%, N≤0.008%; Surplus is iron and unavoidable impurities.Specification is: the oil well pipe coupling material of Φ 153.67 * 13.50mm, Φ 127 * 13.50mm, Φ 88.9 * 13mm, Φ 93.17 * 14.5mm, Φ 108 * 14.50mm, Φ 133 * 15.50mm is example.
In the implementation process with the heating of pipe blank to 1250 of mentioned component steel ℃～1280 ℃, insulation 2h～3h; The pipe of coming out of the stove is worn into hollow billet at 1200 ℃～1250 ℃; Hollow billet carries out main mill continuous rolling at 980 ℃～1100 ℃; Tandem rolling is taken off steel pipe behind the rod to be implemented to wear water and is quickly cooled to a certain temperature more than the Ar3 (850 ℃～950 ℃); Through fast cold after steel pipe at traversing chain samming 15s～30s; Steel pipe control is directly advanced sizing mill behind the samming when temperature (750 ℃～850 ℃), guarantees metastablely to decide austenitic area finish to gauge what be not less than Ar3; Be chilled to 620 ℃～690 ℃ soon to deciding after the tube reducing finish to gauge steel pipe water spray or steam fog, near the Ar1 temperature that guarantees at steel, increase ferrite and pearlite nucleation rate, obtains tiny F+P and organize; Two axial flow blowers are installed in the cold bed both sides, are increased cross-ventilation, improve cooling velocity, guarantee the faster cooling of steel pipe behind the sizing.Implement steel pipe composition of the present invention and see Table 1, the condition control of carrying out sees Table 2, embodiment steel tube performance and sees Table 3.
Table 1 embodiment steel pipe chemical composition wt%
| Grade of steel | C | Si | Mn | P | S | Ti | N | O |
| 1 | 0.35 | 0.52 | 1.42 | 0.012 | 0.008 | 0.022 | 0.0040 | 0.0018 |
| 2 | 0.28 | 0.30 | 1.68 | 0.011 | 0.010 | 0.017 | 0.0047 | 0.0021 |
The condition control of table 2 pair embodiment steel pipe
Table 3 embodiment steel tube performance
Claims (4)
1. production method of improving hot-rolling oil well casing coupling material impact flexibility is characterized in that pipe sent in the rotary heating furnace and heats, and heating and temperature control is at 1250 ℃～1280 ℃; The heating pipe is bored a hole by punch, and the control punch temperature is at 1200 ℃～1250 ℃; Perforation back seamless pipe hollow billet carries out continuous rolling by mandrel rolling mill, and the continuous rolling temperature is controlled at 980 ℃～1100 ℃; Steel pipe after rolling is implemented to wear water at once be quickly cooled to 850 ℃～950 ℃ temperature ranges; Afterwards steel pipe is carried out samming; Steel pipe behind the samming advances to decide the tube reducing milling train, temperature control more than Ar3 40 ℃～140 ℃; It is cold soon to decide wear long water or steam fog of steel pipe after the tube reducing finish to gauge, above 70 ℃ at Ar1 point～Ar1 point of temperature controls; At last steel pipe being transferred to cold bed carries out air-cooled; The percentage by weight of described pipe chemical composition is C:0.24%～0.40%, Si:0.17%～0.60%, and Mn:1.30%～1.70%, P≤0.025%, S≤0.010%, Ti:0.010%～0.030%, N≤0.008%, surplus is iron and unavoidable impurities.
2. a kind of production method of improving hot-rolling oil well casing coupling material impact flexibility according to claim 1 is characterized in that being incubated 2h～3h after the heating of pipe blank.
3. a kind of production method of improving hot-rolling oil well casing coupling material impact flexibility according to claim 1 and 2 is characterized in that fast cold back steel pipe is at traversing chain samming 15s～30s.
4. a kind of production method of improving hot-rolling oil well casing coupling material impact flexibility according to claim 1, it is characterized in that being transferred to cold bed by steel pipe, to carry out air-cooled speed be 1 ℃～3 ℃/s.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200910010669 CN101829679B (en) | 2009-03-09 | 2009-03-09 | Production method for producing shock toughness of pipe coupling material of hot rolled oil well |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200910010669 CN101829679B (en) | 2009-03-09 | 2009-03-09 | Production method for producing shock toughness of pipe coupling material of hot rolled oil well |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101829679A CN101829679A (en) | 2010-09-15 |
| CN101829679B true CN101829679B (en) | 2013-09-04 |
Family
ID=42713977
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200910010669 Active CN101829679B (en) | 2009-03-09 | 2009-03-09 | Production method for producing shock toughness of pipe coupling material of hot rolled oil well |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101829679B (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2017050230A1 (en) * | 2015-09-24 | 2017-03-30 | 宝山钢铁股份有限公司 | Online-controlled seamless steel tube cooling process and seamless steel tube manufacturing method with effective grain refinement |
| CN106555045A (en) * | 2015-09-24 | 2017-04-05 | 宝山钢铁股份有限公司 | A kind of seamless steel pipe press quenching cooling technique and manufacture method of utilization waste heat |
| WO2019107409A1 (en) * | 2017-11-29 | 2019-06-06 | 日本製鉄株式会社 | Method for manufacturing seamless steel tube |
| CN108273850A (en) * | 2018-01-05 | 2018-07-13 | 衡阳华菱连轧管有限公司 | The test instrument on line method of middle carbon microalloy steel pipe |
| CN111589885A (en) * | 2020-04-29 | 2020-08-28 | 东北大学 | Online cooling system for hot-rolled seamless steel pipe and arrangement method of cooling device on online cooling system |
| CN113584399B (en) * | 2021-07-24 | 2022-08-26 | 浙江泰富无缝钢管有限公司 | Seamless steel pipe and manufacturing method thereof |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2137539A (en) * | 1983-03-28 | 1984-10-10 | Mannesmann Ag | Manufacturing seamless steel pipe |
| GB2101014B (en) * | 1981-07-09 | 1985-04-03 | Mannesmann Ag | High quality seamless steel pipes |
| US5019180A (en) * | 1988-09-16 | 1991-05-28 | Mannesmann Aktiengesellschaft | Method of manufacturing of high-strength seamless steel tubes |
| US5186769A (en) * | 1990-08-16 | 1993-02-16 | The Algoma Steel Corporation, Limited | Seamless steel tube manufacture |
| CN1502425A (en) * | 2002-11-25 | 2004-06-09 | 宝山钢铁股份有限公司 | Method for mfg of high-quality seamless steel pipe |
| CN101020986A (en) * | 2007-03-05 | 2007-08-22 | 包头钢铁（集团）有限责任公司 | N80 level petroleum pipe produced with micro alloyed medium carbon steel and its production process |
-
2009
- 2009-03-09 CN CN 200910010669 patent/CN101829679B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2101014B (en) * | 1981-07-09 | 1985-04-03 | Mannesmann Ag | High quality seamless steel pipes |
| GB2137539A (en) * | 1983-03-28 | 1984-10-10 | Mannesmann Ag | Manufacturing seamless steel pipe |
| US5019180A (en) * | 1988-09-16 | 1991-05-28 | Mannesmann Aktiengesellschaft | Method of manufacturing of high-strength seamless steel tubes |
| US5186769A (en) * | 1990-08-16 | 1993-02-16 | The Algoma Steel Corporation, Limited | Seamless steel tube manufacture |
| CN1502425A (en) * | 2002-11-25 | 2004-06-09 | 宝山钢铁股份有限公司 | Method for mfg of high-quality seamless steel pipe |
| CN101020986A (en) * | 2007-03-05 | 2007-08-22 | 包头钢铁（集团）有限责任公司 | N80 level petroleum pipe produced with micro alloyed medium carbon steel and its production process |
Non-Patent Citations (2)
| Title |
|---|
| "生产非调质N80级石油套管的新工艺可行性实验研究";刘照等;《热加工工艺》;20060525(第5期);第44页左栏第3-6行，表1，右栏第12-20行，第45页左栏倒数第2-10行 * |
| 刘照等."生产非调质N80级石油套管的新工艺可行性实验研究".《热加工工艺》.2006,(第5期),43-46. |
Also Published As
| Publication number | Publication date |
|---|---|
| CN101829679A (en) | 2010-09-15 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN107099745B (en) | High-carbon-equivalent low-temperature high-toughness pipeline steel plate for X80 elbow and manufacturing method thereof | |
| CN101829679B (en) | Production method for producing shock toughness of pipe coupling material of hot rolled oil well | |
| CN102560253B (en) | Manufacturing method of high-quality cold heading steel with uniform structure property | |
| CN103103449B (en) | The X80 pipeline steel of a kind of anti-large deformation and production method thereof | |
| CN102703803B (en) | Globular pearlite type hot rolled coil and production method thereof | |
| CN101994059B (en) | Thick-wall X70 pipeline steel coiled plate and manufacture method thereof | |
| CN101658879A (en) | Method for manufacturing seamless steel pipe | |
| CN101045238A (en) | Online softening rolling method for medium carbon alloy cold forging steel | |
| CN102400038A (en) | Hot-rolled dual-phase steel and production method thereof | |
| CN101456032A (en) | Production method of carbon cold-forging steel large coil for 8.8 level high-intensity fasteners | |
| CN105483545A (en) | 800MPa level hot-rolling high broaching steel plate and manufacturing method thereof | |
| CN102808131A (en) | Method for manufacturing high-quality high-strength cold forging steel with uniform texture performance | |
| CN102517500A (en) | Rolling process for producing 35CrMo alloy cold forging steel through adopting small billets | |
| CN102618793A (en) | Steel plate with yield strength of 960MPa and manufacturing method thereof | |
| CN108246801A (en) | A kind of big specification non-hardened and tempered steel rolling equipment and its rolling production method | |
| CN101633976A (en) | Direct quenching technology suitable for steel plates with different thicknesses and high durability | |
| PL433607A1 (en) | Method of producing steel wire rod with a round cross-section and steel wire rod with a round cross-section | |
| CN104073744B (en) | The high tenacity X80 pipe line steel coiled sheet of thickness >=18.5mm and production method | |
| CN102080194B (en) | Large-deformation-preventing pipeline steel with excellent aging resistance and production method thereof | |
| CN107746936A (en) | Tensile strength 590MPa level dual phase steel of ferrite and bainite and preparation method thereof | |
| CN105274434B (en) | It is a kind of to reduce the hot-rolled low-alloy steel and production method for causing cracking by segregation | |
| CN112676343A (en) | Method for producing thin anti-seismic fire-resistant steel by adopting continuous rolling and roll rolling heat preservation | |
| CN103045945A (en) | Economical fabrication method of high-toughness X70 pipeline hot rolled steel plate coil | |
| CN102154585B (en) | High-intensity quake-resistant steel bar for buildings and manufacturing method thereof | |
| CN101845583B (en) | Petroleum sleeve steel and manufacturing method thereof |
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 |