CN102296233B - Steel for high-frequency electric resistance welding petroleum casing pipe and manufacturing method of steel - Google Patents
Steel for high-frequency electric resistance welding petroleum casing pipe and manufacturing method of steel Download PDFInfo
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Abstract
The invention relates to steel for a high-frequency electric resistance welding petroleum casing pipe used under a hydrogen sulfide environment. The steel comprises the following components in percentage by mass: 0.15 to 0.35 percent of C, 0.1 to 0.6 percent of Si, 0.3 to 1 percent of Mn, less than or equal to 0.015 percent of P, less than or equal to 0.003 percent of S, 0.1 to 0.5 percent of Mo, 0.03 to 0.2 percent of V, 0.01 to 0.05 percent of Nb, 0.01 to 0.05 percent of Ti, 0.01 to 0.08 percent of Al, 0.0005 to 0.005 percent of Ca, 0.001 to 0.003 percent of B, and the balance of Fe and inevitable impurities; and the carbon equivalent is less than or equal to 0.43. The provided steel for the petroleum casing pipe can be used for manufacturing the high-frequency electric resistance welding petroleum casing pipe of 80ksi steel level with good sulfide stress corrosion cracking resistance and can be applied to a CO2 gas protection welding process, and the subsequent production efficiency of the high-frequency electric resistance welding petroleum casing pipe is improved.
Description
Technical field
The present invention relates to a kind of high-frequency electric resistance welded petroleum casing pipe using under hydrogen-sulfide environmental, specifically, relate to a kind of high-frequency electric resistance welded petroleum casing pipe steel using under hydrogen-sulfide environmental, and 80ksi grade of steel high-frequency electric resistance welded petroleum casing pipe and the manufacture method thereof with this steel grade, made.
Background technology
API standard regulation, petroleum casing pipe is divided into two types of seamless tube and welded casings.For seamless tube, high-frequency electric resistance welded petroleum casing pipe has the distinguishing features such as production efficiency is high, dimensional precision good, specification limit is wide, cost is low, is therefore manufacturer and oil field user's first-selected kind, is subject to the favor in market always.
The environment that petroleum casing pipe is used much contains the corrosive mediums such as hydrogen sulfide, not only can carry out uniform corrosion to body surface, can also generate hydrogen with iron and steel effect, enter steel substrate inside, make sleeve pipe generation stress corrosion fracture, within the extremely short time, lost efficacy, thereby brought great financial loss and potential safety hazard to field produces.
The traditional production technique of high-frequency electric resistance welded petroleum casing pipe is: according to the needs of sleeve pipe performance, design suitable chemical composition, smelt and roll into hot-rolled sheet coil, coiled sheet is made to materials in the tube by moulding and high frequency resistance welding mode, steel pipe seam or steel pipe integral are heat-treated, then pipe end is carried out to suitable screw thread processing, final production goes out qualified petroleum casing pipe.This kind of the weakest place of sleeve pipe sulfur resistance is weld metal zone, weld metal zone comprises welded bonds and heat affected zone, weld metal zone is coarse grains under high temperature action, inclusion increases, the hydrogen that is penetrated into matrix inside easily causes hydrogen induced cracking (HIC) at crystal boundary and inclusion place adsorpting aggregation generation hydrogen blistering, or the atomic reaction of hydrogen and crystal boundary generates hydride, makes embrittlement of grain boundaries, easily produces stress corrosion crack.
In order to enhance productivity, except needs carry out high frequency resistance welding plate flanging part, also need two coiled sheets to carry out CO between end to end
2shielded welding, produces continuously to realize multireel.But CO
2shielded welding requires the carbon equivalent of coiled sheet low, in order well to carry out coiled sheet butt welding end to end, generally all the carbon equivalent of coiled sheet is controlled at below 0.43.
To the research of welded tube under sour environment, be mainly to control inclusion both at home and abroad.For example, Japanese Patent JP62170458 proposes to add Ti and Zr as reductor, replace the effect of Al reductor, guarantee Ti/Al, the ratio of Zr/Al or (Ti+Zr)/Al is greater than 2, the content of Al is greater than 0.005%, by the ratio of controlling inclusion, improves toughness and resistance against hydrogen cracking performance.But the casing steel obtaining according to this Composition Design scheme can form carbide and the nitride of a large amount of Ti and Zr, reduced the toughness of body.Therefore, European patent EP 0270952 proposes Ti/Al, and the ratio of Zr/Al or (Ti+Zr)/Al is less than 2, reduces carbide and the nitride of Ti and Zr, guarantees Al simultaneously
2o
3content be less than 50%.But above-mentioned patent application has only solved this technical problem of resistance against hydrogen cracking, and cannot thoroughly solve the problem of resisting sulfide stress corrosion crack.
Therefore, need one badly and possess high welding performance and resisting sulfide stress corrosion crack performance, and the lower oil casing pipe steel of production cost.
The object of the present invention is to provide a kind of high-frequency electric resistance welded petroleum casing pipe steel using under hydrogen-sulfide environmental, there is good hydrogen sulfide corrosion resistance energy, meet the needs of the oilfield prospecting developing with hydrogen sulfide corrosion resistant requirement.
For achieving the above object, oil casing pipe steel provided by the present invention, its composition quality degree is: C:0.15-0.35, Si:0.1-0.6, Mn:0.3-1, P :≤0.015, S :≤0.003, Mo:0.1-0.5, V:0.03-0.2, Nb:0.01-0.05, Ti:0.0l-0.05, Al:0.01-0.08, Ca:0.0005-0.005, B:0.001-0.003, surplus is Fe and inevitable impurity, and its carbon equivalent≤0.43.
In addition, the present invention also provides a kind of manufacture method of above-mentioned oil casing pipe steel, comprises successively smelting, casting, rolling, batches, tubulation, thermal treatment.
Preferably, the Heating temperature of described rolling is 1200-1300 ℃, and finishing temperature is 800-1000 ℃.
Preferably, the laminar flow cooling temperature batching described in is 650-700 ℃.
Preferably, described tubulation comprises high-frequency resistance welding and two steps of the online normalizing thermal treatment of weld seam.
Preferably, described thermal treatment comprises shrend and tempering after heating and thermal insulation.
More preferably, described high frequency resistance welding jointing temp is 1200-1400 ℃.
More preferably, the heat treated temperature of the online normalizing of described weld seam is 880-980 ℃.
Further preferably, the temperature of described heating and thermal insulation is 900-950 ℃, and soaking time is 30-60min.
Further preferably, described tempering temperature is 680-720 ℃, and soaking time is 90-150min.
To further illustrate the present invention below.
The present invention is by optimization design alloying constituent, lower inclusion content and adopt the online thermal treatment of multiple weld seam normalizing to obtain the grain structure of even refinement, makes the resisting sulfide stress corrosion crack performance of high-frequency electric resistance welded petroleum casing pipe steel obtain larger raising.The present invention adds the microalloy elements such as Nb, V, Ti, B in material, by its precipitation strength effect and grain refinement effect, reduces grain boundary defects, improves resisting sulfide stress corrosion crack performance.On Composition Design, add B, utilize its strengthening effect to crystal boundary, lattice omission and the hole of weld seam and body region crystal boundary are reduced, crystal boundary free energy reduces, and hinders the formation of the hydride that makes embrittlement of grain boundaries; B can make to reduce along the precipitate of crystal boundary simultaneously, can postpone the course of cracks forming on crystal boundary, improves the especially resisting sulfide stress corrosion crack performance of weld seam of casing steel.After welding completes, carry out online thermal treatment, adopt the crystal grain of different normalizing process refinement weld metal zones, improve its sulfur resistance simultaneously.
Below the design of composition of the present invention is described:
C:C is carbide forming element, can improve the intensity of steel, and DeGrain when too low can the remarkable welding property that reduces steel when too high.
Si:Si solid solution is in ferrite to improve the yield strength of steel, and unsuitable too high, too high meeting worsens processing and toughness, lower than 0.1% DeGrain.
Mn:Mn is austenite former, can improve the hardening capacity of steel, and it is not obvious that content is less than at 0.3 o'clock and acts on, and when content is greater than 1%, by the microstructure segregation significantly increasing in steel, affects homogeneity and the sulfur resistance of hot rolling microstructure.
Mo: be mainly intensity and the temper resistance that improves steel by carbide and solution strengthening form, too high levels can reduce the toughness of steel.
V:V can crystal grain thinning, forms carbide, can significantly improve the intensity of steel, but content is while reaching a certain amount of, and its effect increase is just not obvious.
Nb:Nb is thin brilliant and precipitation strength element, can make up the decline that reduces the intensity causing because of carbon, when content is less than 0.01%, act on not obvious, expensive because of it, so want prohibitive amount.
Ti:Ti is strong carbonitride forming element, and significantly refine austenite crystal grain, can make up the decline that reduces the intensity causing because of carbon, if content is too high, easily forms thick TiN, reduces material property.
B:B can increase hardening capacity, can effectively strengthen crystal boundary, makes to reduce along the precipitate of crystal boundary, can postpone the course of cracks forming on crystal boundary, improve resisting sulfide stress corrosion crack performance, act on not obviously when content is less than 0.001%, the too high steel-making of content is difficult to accurate control.
P, S:P and S are the detrimental impurity elements in steel, and too high levels can worsen the toughness of resisting sulfide stress corrosion crack performance and steel, therefore should reduce P, S content in steel as far as possible.
Compared with existing oil casing pipe steel, the present invention has following beneficial effect:
(1) oil casing pipe steel provided by the invention, it can be used in manufacture 80ksi grade of steel and has the high-frequency electric resistance welded petroleum casing pipe of good resisting sulfide stress corrosion crack, and can be applicable to CO
2shielded welding operation, improves follow-up high-frequency electric resistance welded petroleum casing pipe production efficiency;
(2) the multiple normalizing heat-treating methods of described oil casing pipe steel weld seam provided by the invention, it can refinement weld grain, improves homogeneity of structure, improves the resisting sulfide stress corrosion crack performance of weld seam.
(3) high-frequency electric resistance welded petroleum casing pipe steel provided by the invention, it meets the requirement of 80ksi grade of steel, can be widely used in oil production;
(4) material alloys cost used in the present invention is low, has great economic benefit.
Embodiment
Embodiment 1
Embodiment 1 chemical composition is in Table 1.Molten steel is through converter smelting, and casting, is heated to roll into strip after 1220 ℃ of heating, 850 ℃ of finishing temperatures, and laminar flow is cooled to 650 ℃, is curled into hot rolled coil; High frequency resistance welding temperature is that 1400 ℃, welding speed are 15m/min; The online normalizing thermal treatment temp of three road weld seams is respectively 980 ℃, 950 ℃, 920 ℃.950 ℃ of homogeneous tube thermal treatment Heating temperatures, shrend after insulation 40min, 720 ℃ of tempering temperatures, soaking time 90min, mechanical property and resisting sulfide stress corrosion crack performance are as shown in table 2.
Embodiment 2
Embodiment 2 chemical compositions are in Table 1.Molten steel is through converter smelting, and casting, is heated to roll into strip after 1250 ℃ of heating, 880 ℃ of finishing temperatures, and laminar flow is cooled to 680 ℃, is curled into hot rolled coil; High frequency resistance welding temperature is that 1300 ℃, welding speed are 12m/min; The online normalizing thermal treatment temp of three road weld seams is respectively 960 ℃, 950 ℃, 900 ℃.950 ℃ of homogeneous tube thermal treatment Heating temperatures, shrend after insulation 30min, 710 ℃ of tempering temperatures, soaking time 100min, mechanical property and resisting sulfide stress corrosion crack performance are as shown in table 2.
Embodiment 3
Embodiment 3 chemical compositions are in Table 1.Molten steel is through converter smelting, and casting, is heated to roll into strip after 1200 ℃ of heating, 900 ℃ of finishing temperatures, and laminar flow is cooled to 700 ℃, is curled into hot rolled coil; High frequency resistance welding temperature is that 1350 ℃, welding speed are 14m/min; The online normalizing thermal treatment temp of three road weld seams is respectively 980 ℃, 920 ℃, 880 ℃.920 ℃ of homogeneous tube thermal treatment Heating temperatures, shrend after insulation 50min, 700 ℃ of tempering temperatures, soaking time 110min, mechanical property and resisting sulfide stress corrosion crack performance are as shown in table 2.
Embodiment 4
Embodiment 4 chemical compositions are in Table 1.Molten steel is through converter smelting, and casting, is heated to roll into strip after 1280 ℃ of heating, 910 ℃ of finishing temperatures, and laminar flow is cooled to 660 ℃, is curled into hot rolled coil; High frequency resistance welding temperature is that 1250 ℃, welding speed are 11m/min; The online normalizing thermal treatment temp of three road weld seams is respectively 960 ℃, 940 ℃, 900 ℃.900 ℃ of homogeneous tube thermal treatment Heating temperatures, shrend after insulation 60min, 690 ℃ of tempering temperatures, soaking time 150min, mechanical property and resisting sulfide stress corrosion crack performance are as shown in table 2.
Comparative example
Comparative example 1 is not add B with embodiment 1 difference on composition, other manufactures are all consistent with detection method, comparative example 2 difference from Example 1 be welding after without the online normalizing thermal treatment of weld seam, other manufactures are all consistent with detection method, and mechanical property and resisting sulfide stress corrosion crack performance are as shown in table 2.
In comparative example 1 and comparative example 2, the resisting sulfide stress corrosion crack performance of weld seam does not meet the demands.Visible, adopt designed chemical composition and the manufacturing process of the present invention, can stably produce and meet the well behaved high-frequency resistance casing steel of 80ksi steel grade sulfur resistant compound stress corrosion crack.、
Hydrogen sulfide service check adopts the laboratory detection method of NACE TM0177-2005 resisting sulfide stress corrosion crack iron and steel to detect.
The chemical composition (wt%) of table 1 embodiment, comparative example
| C | Si | Mn | P | S | Mo | V | Ti | Nb | B | Carbon equivalent | |
| Embodiment 1 | 0.25 | 0.5 | 0.6 | 0.009 | 0.002 | 0.2 | 0.11 | 0.01 | 0.01 | 0.003 | 0.41 |
| Embodiment 2 | 0.3 | 0.3 | 0.4 | 0.010 | 0.003 | 0.1 | 0.03 | 0.05 | 0.03 | 0.005 | 0.41 |
| Embodiment 3 | 0.22 | 0.1 | 0.3 | 0.010 | 0.001 | 0.5 | 0.2 | 0.015 | 0.035 | 0.001 | 0.38 |
| Embodiment 4 | 0.15 | 0.3 | 1 | 0.012 | 0.002 | 0.5 | 0.04 | 0.03 | 0.05 | 0.002 | 0.43 |
| Comparative example 1 | 0.25 | 0.5 | 0.6 | 0.009 | 0.002 | 0.2 | 0.11 | 0.01 | 0.01 | - | 0.41 |
| Comparative example 2 | 0.25 | 0.5 | 0.6 | 0.009 | 0.002 | 0.2 | 0.11 | 0.01 | 0.01 | 0.003 | 0.41 |
The mechanical property of table 2 embodiment, comparative example
Claims (7)
1. a high-frequency electric resistance welded petroleum casing pipe steel, its composition quality degree is:
C： 0.15-0.35
Si： 0.1-0.6
Mn： 0.3-1
P： ≤0.015
S： ≤0.003
Mo： 0.1-0.5
V： 0.03-0.2
Nb： 0.01-0.05
Ti： 0.01-0.05
Al： 0.01-0.08
Ca： 0.0005-0.005
B： 0.001-0.003
Surplus is Fe and inevitable impurity, and its carbon equivalent≤0.43.
2. oil casing pipe steel as claimed in claim 1, is characterized in that, the mass percentage content of described C is 0.2-0.3, and the quality of described Mo is than percentage composition 0.2-0.4, and the mass percentage content of described V is 0.05-0.15.
3. manufacture the method for casing steel as claimed in claim 1, it is characterized in that, described method comprises successively smelting, casting, rolling, batches, tubulation, thermal treatment;
The Heating temperature of described rolling is 1200-1300 ℃, and finishing temperature is 800-1000 ℃;
The described laminar flow cooling temperature batching is 650-700 ℃;
Described tubulation comprises high-frequency resistance welding and two steps of the online normalizing thermal treatment of weld seam;
Described thermal treatment comprises shrend and tempering after heating and thermal insulation.
4. method as claimed in claim 3, is characterized in that, described high frequency resistance welding jointing temp is 1200-1400 ℃.
5. method as claimed in claim 3, is characterized in that, the heat treated temperature of the online normalizing of described weld seam is 880-980 ℃.
6. method as claimed in claim 3, is characterized in that, the temperature of described heating and thermal insulation is 900-950 ℃, and soaking time is 30-60min.
7. method as claimed in claim 3, is characterized in that, described tempering temperature is 680-720 ℃, and soaking time is 90-150min.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104073719A (en) * | 2014-06-25 | 2014-10-01 | 宝山钢铁股份有限公司 | High-strength welded steel pipe and manufacturing method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111607744B (en) * | 2019-02-22 | 2021-11-16 | 宝山钢铁股份有限公司 | Thick-wall high-strength high-toughness petroleum casing pipe and manufacturing method thereof |
| CN115041928A (en) * | 2022-07-05 | 2022-09-13 | 宝鸡宝冶钛镍制造有限责任公司 | Seabed petroleum titanium steel composite pipe and manufacturing method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3268877B2 (en) * | 1993-03-24 | 2002-03-25 | 株式会社リコー | Aspherical lens measurement method |
| CN101096737A (en) * | 2006-06-28 | 2008-01-02 | 宝山钢铁股份有限公司 | High-strength straight welding oil annular tube steel and manufacturing method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH03268877A (en) * | 1990-03-16 | 1991-11-29 | Sumitomo Metal Ind Ltd | Manufacture of sulfide stress cracking resistant welded steel pipe for oil well |
| JPH0641679A (en) * | 1992-07-27 | 1994-02-15 | Nippon Steel Corp | Electric-resistance-welded steel tube excellent in sulphide stress corrosion cracking resistance |
| JPH06116645A (en) * | 1992-10-05 | 1994-04-26 | Sumitomo Metal Ind Ltd | Production of oil well steel pipe excellent in sulfide stress cracking resistance |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3268877B2 (en) * | 1993-03-24 | 2002-03-25 | 株式会社リコー | Aspherical lens measurement method |
| CN101096737A (en) * | 2006-06-28 | 2008-01-02 | 宝山钢铁股份有限公司 | High-strength straight welding oil annular tube steel and manufacturing method thereof |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104073719A (en) * | 2014-06-25 | 2014-10-01 | 宝山钢铁股份有限公司 | High-strength welded steel pipe and manufacturing method thereof |
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