CN101994057A - Steel for vanadium alloying straight electric resistance welded petroleum casing pipe and manufacturing method thereof - Google Patents
Steel for vanadium alloying straight electric resistance welded petroleum casing pipe and manufacturing method thereof Download PDFInfo
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- CN101994057A CN101994057A CN 201010569434 CN201010569434A CN101994057A CN 101994057 A CN101994057 A CN 101994057A CN 201010569434 CN201010569434 CN 201010569434 CN 201010569434 A CN201010569434 A CN 201010569434A CN 101994057 A CN101994057 A CN 101994057A
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Abstract
The invention discloses steel for vanadium alloying straight electric resistance welded petroleum casing pipe and a manufacturing method thereof, and belongs to the technical field of production of steel hot-rolled steel coils for petroleum casing pipes. The steel comprises the following chemical composition in percentage by weight: 0.14 to 0.21 percent of C, less than or equal to 0.40 percent of Si, 0.8 to 1.4 percent of Mn, 0.015 to 0.050 percent of V, 0.008 to 0.020 percent of Ti, less than or equal to 0.025 percent of P, less than or equal to 0.008 percent of S, 0.015 to 0.050 percent of Alt and the balance of iron and inevitable impurity elements. The invention has the advantage that: high-quality low-cost steel for J55-grade petroleum casing pipes can be stably produced on a large scale.
Description
Technical field
The invention belongs to oil casing pipe steel hot-rolled sheet coil production technical field, particularly a kind of vanadium alloying straight joint resistance welding oil annular tube steel and manufacture method thereof.
Background technology
At present petroleum casing pipe mainly contains two kinds of weldless steel tube and longitudinal resistance welded pipes.Longitudinal resistance welded pipe dimensional precision height, price comparison is low.In recent years, the usage quantity of longitudinal resistance welded pipe oil well pipe has accounted for about 30% of oil well pipe total amount.To be low-carbon microalloyed steel form through TMCP is rolling steel for longitudinal resistance welded pipe, has good obdurability.
J55 rank oil well casing is produced in enormous quantities with steel, but present mass-produced J55 petroleum casing pipe cooperates little Ti processing to improve obdurability and welding property with general high titanium (Ti) or niobium (Nb) alloying of adopting of micro-alloyed steel.For example publication number is the patent " hot-rolled sheet strip steel for straight welding petroleum sheath and production method thereof " of CN 101033525A, carries out microalloying by adding 0.015%～0.040% Ti.This patent is because the single Ti element of employing carries out microalloying, so yield strength is on the low side.Consider that the Bauschinger effect behind the tubulation causes yield strength to reduce about 30MPa, general steel pipe manufacturing concern requires the yield strength of steel plate more than 400MPa.Simultaneously, owing to adopt higher Ti microalloying,, have a strong impact on the toughness and the safety in utilization of steel pipe in molten steel if nitrogen in steel (N) too high levels will cause the TiN particle to be separated out.Therefore this patent requires the N content in the steel not to be higher than 50ppm.There is certain difficulty in this steel of industrial mass stably manufactured.
The above-mentioned drawback that the method that adopts the Nb microalloying to cooperate little Ti to handle mostly in the present suitability for industrialized production avoids single Ti alloying to cause.But the Nb microalloyed steel tends to bring problems such as strand angle transverse fissure in actual production, causes a large amount of slabs to need dress watch even do the corner cut processing guaranteeing defectives such as the surperficial flawless of steel plate (band).And the surging cost of alloy that also causes of Nb alloy price significantly increases.
Summary of the invention
The object of the present invention is to provide a kind of vanadium alloying straight joint resistance welding oil annular tube steel and manufacture method thereof.Being used to make yield strength is other longitudinal resistance welded pipe of 380MPa level.Composition design by adopting the V microalloying to cooperate little Ti to handle has solved the casting blank defect problem that the Nb microalloying brings, the big problem of production difficulty of also having avoided single Ti alloying to bring, but also reduced cost of alloy.
A kind of V alloy straight joint resistance welding oil annular tube steel, the chemical ingredients of steel (heat analysis) is by weight percentage: C:0.14～0.21%, Si≤0.40%, Mn:0.8～1.4%, V:0.015～0.050%, Ti:0.008～0.020%, P≤0.025%, S≤0.008%, Alt:0.015～0.050%, all the other are iron and unavoidable impurities element.
Introduce the effect of each main alloy element below respectively:
C：0.14～0.21％。The C element is the main solution strengthening element of steel, and combines the precipitation hardened steel matrix of formation with the steel grade microalloy element.But the C too high levels will worsen tissue, welding property and the impact property of steel.Therefore the present invention is controlled at lower scope with C content, has both brought into play its strengthening effect, does not reduce its toughness properties and use properties again.
Mn：0.8～1.4％。The Mn element is an austenite former, reduces the austenite-ferrite transformation temperature, and thinning microstructure improves toughness, also has significantly solution strengthening effect, content to cross the low toughness and tenacity that can't guarantee steel simultaneously.But too high levels will cause tangible segregation and tissue deterioration, influence toughness properties.
V：0.015～0.050％。V element is the strong carbide forming element, separates out with the form of carbon vanadium nitride in steel, significantly improves the intensity of steel.
Ti：0.008～0.020％。Ti is strong nitride forming element, and the effective pinning austenite grain boundary of TiN under the high temperature suppresses AUSTENITE GRAIN COARSENING under the high temperature.Cross low Ti and cause the TiN solid solubility temperature low excessively, can't effectively stop the austenite alligatoring.Too high Ti causes TiN to separate out in molten steel and alligatoring, worsens the impelling strength of steel.
Manufacture method provided by the invention comprises that smelting-base-hot rolling-laminar flow cools off-batch step, controls following processing parameter.
1, this oil casing pipe steel is through converter or electrosmelting, and be cast into slab, the chemical ingredients of oil casing pipe steel is by weight percentage: C:0.14～0.21%, Si≤0.40%, Mn:0.8～1.4%, V:0.015～0.050%, Ti:0.008～0.020%, P≤0.025%, S≤0.008%, Alt:0.015～0.050%, all the other are iron and unavoidable impurities element.
2, slab is rolled into strip after 1160～1250 ℃ of heating, and the finishing temperature of strip is between 800～900 ℃.
3, rolling the back strip is cooled to 520～640 ℃ through laminar flow and coils into coiled sheet.
The hot rolled coil that rolls into by above-mentioned requirements can provide manufacturing J55 welded tube.
The invention has the advantages that: adopt the composition design of the little Ti alloying of V+, the intensity of having avoided single Ti alloying composition system to cause is on the low side and the bigger problem of production difficulty, the defect problems such as slab surface crack of also having avoided the little Ti alloying of Nb+ to cause, cost is necessarily reduced simultaneously, and producing cheaply for stablizing of this steel is in enormous quantities provides feasible technical scheme.
Embodiment
Embodiments of the invention see the following form 1～3.Table 1 is for the chemical ingredients of test steel, and with the rolling rolling of its hot rolling technology in accordance with regulations, concrete processing parameter sees Table 2, and mechanical property sees Table 3.As can be seen from Table 3, adopt composition of the present invention and technology, the yield strength of the test steel of production is all more than 420MPa, and the toughness and tenacity excellence can satisfy the performance requriements of J55 petroleum casing pipe fully.
The chemical ingredients of table 1 test steel, wt.%
| Numbering | C | Si | Mn | P | S | V | Ti | Alt |
| A | 0.17 | 0.20 | 1.33 | 0.016 | 0.006 | 0.02 | 0.02 | 0.041 |
| B | 0.17 | 0.20 | 1.34 | 0.011 | 0.002 | 0.018 | 0.019 | 0.044 |
The technology of table 2 test steel
Table 3 mechanical property
Claims (2)
1. vanadium alloying straight joint resistance welding oil annular tube steel, it is characterized in that: the chemical ingredients of steel is by weight percentage: C:0.14～0.21%, Si≤0.40%, Mn:0.8～1.4%, V:0.015～0.050%, Ti:0.008～0.020%, P≤0.025%, S≤0.008%, Alt:0.015～0.050%, all the other are iron and unavoidable impurities element.
2. the manufacture method of an oil casing pipe steel as claimed in claim 1 comprises that smelting-base-hot rolling-laminar flow cools off-batch step, it is characterized in that, controls following processing parameter:
A, this oil casing pipe steel are through converter or electrosmelting, and be cast into slab, the chemical ingredients of oil casing pipe steel is by weight percentage: C:0.14～0.21%, Si≤0.40%, Mn:0.8～1.4%, V:0.015～0.050%, Ti:0.008～0.020%, P≤0.025%, S≤0.008%, Alt:0.015～0.050%, all the other are iron and unavoidable impurities element;
B, slab are rolled into strip after 1160～1250 ℃ of heating, the finishing temperature of strip is between 800～900 ℃;
C, roll the back strip and be cooled to 520～640 ℃ through laminar flow and coil into coiled sheet.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010569434 CN101994057A (en) | 2010-11-26 | 2010-11-26 | Steel for vanadium alloying straight electric resistance welded petroleum casing pipe and manufacturing method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN 201010569434 CN101994057A (en) | 2010-11-26 | 2010-11-26 | Steel for vanadium alloying straight electric resistance welded petroleum casing pipe and manufacturing method thereof |
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| CN101994057A true CN101994057A (en) | 2011-03-30 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102861785A (en) * | 2012-09-25 | 2013-01-09 | 攀钢集团成都钢钒有限公司 | Nuclear power-used low-temperature seamless steel tube and production method therefore |
| CN104109805A (en) * | 2014-07-25 | 2014-10-22 | 攀钢集团西昌钢钒有限公司 | Steel strip for oil casing and production method of steel strip for oil casing |
| CN106319348A (en) * | 2016-10-27 | 2017-01-11 | 马钢(集团)控股有限公司 | Steel for vanadium-nitrogen micro-alloyed petroleum drill stem changeover sub |
| CN109930081A (en) * | 2019-03-15 | 2019-06-25 | 包头钢铁（集团）有限责任公司 | A kind of petroleum casing pipe and preparation method thereof |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101270438A (en) * | 2007-03-23 | 2008-09-24 | 宝山钢铁股份有限公司 | Normalized steel for resistance welding petroleum case pipe with low yield ratio, resistance welding casing tube and its manufacturing method |
| CN101328559A (en) * | 2007-06-22 | 2008-12-24 | 宝山钢铁股份有限公司 | Steel for low yield ratio petroleum case pipe, petroleum case pipe and manufacturing method thereof |
| CN101798654A (en) * | 2010-04-09 | 2010-08-11 | 中国石油天然气集团公司 | Steel used for straight seam electric resistance welding petroleum casing and casing manufacturing method |
-
2010
- 2010-11-26 CN CN 201010569434 patent/CN101994057A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101270438A (en) * | 2007-03-23 | 2008-09-24 | 宝山钢铁股份有限公司 | Normalized steel for resistance welding petroleum case pipe with low yield ratio, resistance welding casing tube and its manufacturing method |
| CN101328559A (en) * | 2007-06-22 | 2008-12-24 | 宝山钢铁股份有限公司 | Steel for low yield ratio petroleum case pipe, petroleum case pipe and manufacturing method thereof |
| CN101798654A (en) * | 2010-04-09 | 2010-08-11 | 中国石油天然气集团公司 | Steel used for straight seam electric resistance welding petroleum casing and casing manufacturing method |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102861785A (en) * | 2012-09-25 | 2013-01-09 | 攀钢集团成都钢钒有限公司 | Nuclear power-used low-temperature seamless steel tube and production method therefore |
| CN102861785B (en) * | 2012-09-25 | 2015-04-15 | 攀钢集团成都钢钒有限公司 | Nuclear power-used low-temperature seamless steel tube and production method therefore |
| CN104109805A (en) * | 2014-07-25 | 2014-10-22 | 攀钢集团西昌钢钒有限公司 | Steel strip for oil casing and production method of steel strip for oil casing |
| CN106319348A (en) * | 2016-10-27 | 2017-01-11 | 马钢(集团)控股有限公司 | Steel for vanadium-nitrogen micro-alloyed petroleum drill stem changeover sub |
| CN106319348B (en) * | 2016-10-27 | 2018-12-25 | 马钢(集团)控股有限公司 | A kind of v n micro alloying petroleum drill string crossover coupling steel |
| CN109930081A (en) * | 2019-03-15 | 2019-06-25 | 包头钢铁（集团）有限责任公司 | A kind of petroleum casing pipe and preparation method thereof |
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Application publication date: 20110330 |