CN101829679A - 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
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- CN101829679A CN101829679A CN200910010669A CN200910010669A CN101829679A CN 101829679 A CN101829679 A CN 101829679A CN 200910010669 A CN200910010669 A CN 200910010669A CN 200910010669 A CN200910010669 A CN 200910010669A CN 101829679 A CN101829679 A CN 101829679A
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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 rolled and 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 that 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 reduced 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 U.S. Pat 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 steel pipe continuous rolling temperature is controlled at 980 ℃～1100 ℃ carries out, 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 crystallization austenite crystal more at once; Realize samming by traversing chain; The hollow forging of tandem rolling directly advances to decide the tube reducing milling train behind the samming, 40 ℃～140 ℃ scopes more than Ar3, promptly 750 ℃～850 ℃ of temperature metastable are decided the austenitic area and are carried out deciding tube reducing finish to gauge, and the austenite crystal distortion is elongated, increase the ferrite nucleation rate, the steel pipe temperature is not less than the Ar3 temperature after the assurance finish to gauge; Steel pipe after the finish to gauge enter immediately wear wear water cooling in the water pipe or implement steam fog cold soon, steel pipe temperature after fast cold is controlled at above 70 ℃ of Ar1 point～Ar1 point, promptly 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 again crystallization 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 crystallization austenite crystal again, 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 U.S. Pat 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 an 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; Directly advance sizing mill when hollow forging is controlled at temperature (750 ℃～850 ℃) behind the samming, guarantee metastablely to decide austenitic area finish to gauge what be not less than Ar3; Steel pipe water spray or steam fog after the sizing finish to gauge are chilled to 620 ℃～690 ℃ soon, near the Ar1 temperature that guarantees at steel, increase ferrite and pearlite nucleation rate, obtain tiny F+P tissue; 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 being carried out sees Table 2, and the embodiment steel tube performance 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 (5)
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; Hollow forging behind the samming advances to decide the tube reducing milling train, and temperature is controlled at above 40 ℃～140 ℃ of Ar3; Wear long water or steam fog of steel pipe after the finish to gauge is cold soon, and temperature is controlled at above 70 ℃ of Ar1 point～Ar1 point; At last steel pipe being transferred to cold bed carries out air-cooled.
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.
5. a kind of production method of improving hot-rolling oil well casing coupling material impact flexibility according to claim 1, the percentage by weight that it is characterized in that the pipe chemical composition is 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 are iron and unavoidable impurities.
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| 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 |
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| 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 |
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| CN101829679A true CN101829679A (en) | 2010-09-15 |
| CN101829679B CN101829679B (en) | 2013-09-04 |
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Cited By (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 |
| CN106555042A (en) * | 2015-09-24 | 2017-04-05 | 宝山钢铁股份有限公司 | A kind of seamless steel pipe On-line Control cooling technique and manufacture method of effective crystal grain thinning |
| 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 |
| CN111417471A (en) * | 2017-11-29 | 2020-07-14 | 日本制铁株式会社 | Method for manufacturing seamless steel pipe |
| CN113584399A (en) * | 2021-07-24 | 2021-11-02 | 浙江泰富无缝钢管有限公司 | Seamless steel pipe and manufacturing method thereof |
| WO2021218357A1 (en) * | 2020-04-29 | 2021-11-04 | 东北大学 | On-line cooling system for hot-rolled seamless steel tube, and arrangement method for cooling device on on-line cooling system |
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Cited By (10)
| 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 |
| CN106555042A (en) * | 2015-09-24 | 2017-04-05 | 宝山钢铁股份有限公司 | A kind of seamless steel pipe On-line Control cooling technique and manufacture method of effective crystal grain thinning |
| US20180298459A1 (en) * | 2015-09-24 | 2018-10-18 | Baoshan Iron & Steel Co., Ltd. | Online-control cooling process for seamless steel tube for effectively refining grains and the method for manufacturing thereof |
| JP2018534417A (en) * | 2015-09-24 | 2018-11-22 | バオシャン アイアン アンド スティール カンパニー リミテッド | On-line controlled cooling method and manufacturing method for seamless steel pipes for effective grain refinement |
| EP3354756A4 (en) * | 2015-09-24 | 2019-05-01 | Baoshan Iron & Steel Co., Ltd. | Online-controlled seamless steel tube cooling process and seamless steel tube manufacturing method with effective grain refinement |
| CN111417471A (en) * | 2017-11-29 | 2020-07-14 | 日本制铁株式会社 | Method for manufacturing seamless steel pipe |
| CN111417471B (en) * | 2017-11-29 | 2022-04-01 | 日本制铁株式会社 | Method for manufacturing seamless steel pipe |
| 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 |
| WO2021218357A1 (en) * | 2020-04-29 | 2021-11-04 | 东北大学 | On-line cooling system for hot-rolled seamless steel tube, and arrangement method for cooling device on on-line cooling system |
| CN113584399A (en) * | 2021-07-24 | 2021-11-02 | 浙江泰富无缝钢管有限公司 | Seamless steel pipe and manufacturing method thereof |
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