CN101376943B - Manufacturing method of straight welding petroleum casing pipe of steel for 80ksi steel grade - Google Patents
Manufacturing method of straight welding petroleum casing pipe of steel for 80ksi steel grade Download PDFInfo
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Abstract
The present invention provides steel used for an NO80Q steel grade longitudinal welded petroleum sleeve; the weight percentage of the chemical components of the steel is as follows: C: 0.15 percent to 0.35 percent, Si: 0.1 percent to 0.5 percent, Mn: 0.8 percent to 1.5 percent, Al: 0.01 percent to 0.05 percent, Mo: 0.1 percent to 0.5 percent, and the rest are Fe and inevitable impurities. The invention also provides a sleeve manufactured with the steel, and a manufacturing method thereof. In the invention, the design of the alloy components is appropriate, the process is convenient and easy to be operated, the production cost of the sleeve is low and can be widely applied in the exploitation and development of petroleum and natural gas.
Description
Technical field
The present invention relates to a kind of straight joint resistance welding oil annular tube steel, sleeve pipe and manufacture method, more particularly, relate to a kind of N80Q grade of steel straight welding oil annular tube steel, sleeve pipe and manufacture method.
Background technology
Petroleum and natural gas is exploited with sleeve pipe generally according to API (API) the normal structure production and the supply of material.The API standard code can be made petroleum casing pipe with seamless tube and longitudinal welded pipe.For seamless tube, longitudinal welded pipe has distinguishing features such as production efficiency height, dimensional precision is good, specification limit is wide, cost is low, is manufacturer and oil field user's first-selected kind therefore, is subjected to the favor in market always.
With regard to the straight weld sleeve pipe, traditional production technique is: according to the needs of sleeve pipe performance, design suitable chemical ingredients; Smelting also rolls into hot-rolled sheet coil; Coiled sheet is made the pipe material by moulding and vertical masonry joint resistance welding mode; Steel pipe seam or steel pipe integral are heat-treated; And pipe end is carried out suitable screw thread process, final production goes out qualified petroleum casing pipe.
With regard to the N80-Q steel level oil bushing, standard code: the yield strength Rp of steel pipe
0.2Between 552～758MPa, tensile strength R
m〉=689MPa, zero degree transverse impact 〉=20J.
A kind of method that realizes the high-intensity performance requirement is to obtain high-intensity hot-rolled steel sheet, moulding, batch and weld after only butt welded seam heat-treat the performance requriements that reaches the API standard code.Because N80-Q steel-grade bushing yield strength is higher, if according to above-mentioned standard code direct production hot rolling plate, bring difficulty can for thereafter operation making sheet and moulding, therefore, should consider to reduce earlier hot-rolled sheet coil intensity as far as possible, then after welding, by the thermal treatment of postwelding homogeneous tube, such as making product reach the level of N80Q grade of steel by modifier treatment, because weld seam and body have experienced phase transformation simultaneously, homogeneous tube thermal treatment can effectively alleviate weld seam and the structural difference of body, eliminates unrelieved stress, thereby improves the requirement that the telescopic performance satisfies the API standard code.
At present, about welding the report of back butt welded seam treatment production N80 high strength ERW Welded Steel Pipe, as JP60187663, adopt the heat treated mode of postwelding butt welded seam to produce N80Q ERW welding petroleum sheath, the chemical component weight per-cent of its alloy designs is C :≤0.19, Si :≤0.5, Mn:1.0～2.0, Nb :≤0.05, V :≤0.05, Ti≤0.04, Al≤0.05, and all the other are Fe and unavoidable impurities; US4772771, also be to adopt the heat treated mode of postwelding butt welded seam to produce N80 ERW welding petroleum sheath, the chemical component weight per-cent of its alloy designs is C:0.08～0.26, Si:0.1～0.5, Mn:0.8～1.9, Nb :≤0.05, V :≤0.05, Ti≤0.03, B≤0.002, all the other are Fe and unavoidable impurities.All there are a great difference in above-mentioned its alloy designs scheme of two patent documentations and method of making sleeve tube with the present invention.
For obtaining the high grade of steel welded casing of this N80Q, and control the yield strength of its hot-rolled sheet coil as far as possible, consider, should adopt the normal carbon manganese steel of higher carbon from the composition design angle.But for continuous welded tube production,, also need two coiled sheets are carried out CO between end to end except needs carry out the electrical induction heating fusing back extruding welding the plate flanging part
2Shielded welding is so that realize the multireel continuous production.Therefore, from soldering angle, must the carbon equivalent of coiled sheet be limited to some extent.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 0.40.In order to obtain higher-strength than under the low-carbon-equivalent, and when homogeneous tube thermal treatment along the complete through hardening of wall thickness, need in material, add alloying element.
Therefore,, the objective of the invention is to, develop a kind of weld seam high grade of steel N80Q petroleum casing pipe consistent, to satisfy oil and gas exploitation exploitation needs with tube body performance by reasonable component and technological design for addressing the above problem.
Summary of the invention
Purpose of the present invention at first provides a kind of 80ksi grade of steel straight welding oil annular tube steel.
The present invention also provides the sleeve pipe made from above-mentioned steel.
The present invention also provides above-mentioned telescopic manufacture method.
The object of the present invention is achieved like this:
N80Q grade of steel straight welding oil annular tube steel of the present invention, its chemical component weight per-cent is as follows: C:0.15～0.35, Si:0.1～0.5, Mn:0.8～1.5, Al:0.01～0.05, Mo:0.1～0.5, all the other are Fe and unavoidable impurities.
The effect of each alloying element of chemical composition design of the present invention is as follows:
Carbon C:C is a carbide forming element, can improve the intensity of steel, DeGrain when too low, and too Gao Shihui reduces the welding property of steel greatly, and therefore, the content of C is 0.15～0.35 (each element is identical by weight percentage) relatively rationally.
Manganese Mn:Mn is an austenite former, can improve the hardening capacity of steel, and content is not obvious less than effect in 0.8 o'clock, and content increased the microstructure segregation in the steel greatly greater than 1.5 o'clock, influenced the homogeneity of hot rolling microstructure, and therefore, the content of Mn 0.8～1.5 relatively rationally.
Play deoxidation and improve corrosion proof effect in the silicon Si:Si adding steel, but be higher than 0.5, processing and toughness worsen, and therefore, the content of Si compares rationally 0.1～0.5.
Aluminium Al:Al has played the effect of desoxydatoin and crystal grain thinning in steel.When add-on is lower than 0.01, DeGrain, add-on surpasses 0.05, the mechanical property variation, therefore, the content of Al is 0.01～0.05 relatively rationally.
Molybdenum Mo:Mo mainly is intensity and the temper resistance that improves steel by carbide and solution strengthening form, and too high levels can reduce the toughness of steel, and content is lower than 0.1 DeGrain, and therefore, the content of Mo 0.1～0.5 relatively rationally.
The sleeve pipe that the present invention adopts above-mentioned steel to make, its chemical component weight per-cent is as follows: C:0.15～0.35, Si:0.1～0.5, Mn:0.8～1.5, Al:0.01～0.05, Mo:0.1～0.5, all the other are Fe and unavoidable impurities; Described sleeve pipe forms by the homogeneous tube heat treatment process.
The above-mentioned telescopic manufacture method of the present invention, comprise smelting, casting, rolling, cool off, coil into plate, continuously shaped, resistance welding, homogeneous tube thermal treatment and pipe processing, wherein, time≤20s in the described cooling step is cooled to 650～750 ℃ and batches; Described homogeneous tube thermal treatment process is 850～950 ℃ of heat tracing 20～60min, 550～650 ℃ of heat tracing 40～100min after the shrend, tempering.
According to manufacture method of the present invention, wherein be preferably, describedly coil into the coiled sheet that plate obtains yield strength 320～420MPa, help the tubulation moulding of after this carrying out.
According to manufacture method of the present invention, wherein be that temperature is 1200～1300 ℃ in the described rolling step, 800～900 ℃ of finishing temperatures preferably.
According to manufacture method of the present invention, wherein be bonding power 300～700KW in the described resistance-welding process, welding speed 5～20m/min, amount of compression 2～15mm preferably.
According to the present invention, molten steel is through converter or electrosmelting, and conduction of continuous casting becomes slab.Slab rolls into strip after 1200～1300 ℃ of heating, the finishing temperature of strip within rolling in back 20 seconds, is cooled to steel plate rapidly batch below 650～700 ℃ between 800～900 ℃, obtain the coiled sheet of 320～420Mpa low yield strength, help the tubulation moulding.Coiled sheet enters continuously shaped operation subsequently, and then at bonding power 300～700KW, welding speed 5～20m/min carries out resistance welding (ERW) under amount of compression 2～15mm condition.Shrend behind 850～950 ℃ of heat tracing 30～60min then, tempering behind 550～650 ℃ of heat tracing 40～100min is again carried out whole modified thermal treatment to welded tube.At last, manage processing, obtain high strength N80 petroleum casing pipe.
The present invention has following beneficial effect:
N80Q grade of steel straight welding oil annular tube steel of the present invention, sleeve pipe is with low cost, the manufacturing process feasibility is good, can be widely used in the oil and gas exploitation exploitation, its successful design and develop and will bring huge economic benefit, and its market outlook are very huge.
Embodiment
Below by embodiment and comparative example, be described more specifically the present invention.These embodiment only are the descriptions to best mode for carrying out the invention, scope of the present invention are not had any restriction.
Embodiment 1
The chemical composition content of present embodiment steel (weight percent meter) is C:0.16, Si:0.30, Mn:1.0, Al:0.03, Mo:0.24, and all the other are Fe and unavoidable impurities.
Molten steel is through converter smelting, and conduction of continuous casting becomes slab.Slab rolls into strip after 1220 ℃ of heating, the finishing temperature of strip is 860 ℃, within rolling in back 20 seconds, steel plate is cooled to 690 ℃ rapidly batches, and obtains yield strength Rp
0.2For 370MPa, tensile strength Rm are 552MPa, elongation A
50.8mm% is 36.0 coiled sheet.This coiled sheet enters continuously shaped operation subsequently, then carries out resistance welding (ERW) under bonding power 510KW, welding speed 12m/min, amount of compression 6mm condition.Shrend behind 900 ℃ of heat tracing 30min then, tempering behind 580 ℃ of heat tracing 40min is again carried out whole modified thermal treatment to welded tube.At last, manage processing, obtain yield strength Rp
0.2For 640MPa, tensile strength Rm are 818MPa, elongation A
50.8mm% is 27.0, the zero degree transverse impact is the high strength N80Q petroleum casing pipe of 65J.
Embodiment 2
The chemical composition content of present embodiment steel (weight percent meter) is C:0.22, Si:0.33, Mn:1.5, Al:0.02, Mo:0.10, and all the other are Fe and unavoidable impurities.
Molten steel is through converter smelting, and conduction of continuous casting becomes slab.Slab rolls into strip after 1240 ℃ of heating, the finishing temperature of strip is 870 ℃, within rolling in back 20 seconds, steel plate is cooled to 750 ℃ rapidly batches, and obtains yield strength Rp
0.2For 320MPa, tensile strength Rm are 560MPa, elongation A
60.8mm% is 34.0 coiled sheet.This coiled sheet enters continuously shaped operation subsequently, then carries out resistance welding (ERW) under bonding power 550KW, welding speed 15m/min, amount of compression 7mm condition.Shrend behind 920 ℃ of heat tracing 25min then, tempering behind 550 ℃ of heat tracing 70min is again carried out whole modified thermal treatment to welded tube.At last, manage processing, obtain yield strength Rp
0.2For 593MPa, tensile strength Rm are 801MPa, elongation A
50.8mm% is 25.0, the zero degree transverse impact is the high strength N80Q petroleum casing pipe of 78J.
Embodiment 3
The chemical composition content of present embodiment steel (weight percent meter) is C:0.23, Si:0.30, Mn:1.2, Al:0.04, Mo:0.15, and all the other are Fe and unavoidable impurities.
Molten steel is through converter smelting, and conduction of continuous casting becomes slab.Slab rolls into strip after 1270 ℃ of heating, the finishing temperature of strip is 840 ℃, within rolling in back 20 seconds, steel plate is cooled to 710 ℃ rapidly batches, and obtains yield strength Rp
0.2For 350MPa, tensile strength Rm are 560MPa, elongation A
50.8mm% is 35.0 coiled sheet.This coiled sheet enters continuously shaped operation subsequently, then carries out resistance welding (ERW) under bonding power 600KW, welding speed 13m/min, amount of compression 9mm condition.Shrend behind 910 ℃ of heat tracing 20min then, tempering behind 635 ℃ of heat tracing 60min is again carried out whole modified thermal treatment to welded tube.At last, manage processing, obtain yield strength Rp
0.2For 650MPa, tensile strength Rm are 730MPa, elongation A
50.8mm% is 27.0, the zero degree transverse impact is the high strength N80Q petroleum casing pipe of 75J.
Embodiment 4
The chemical composition content of present embodiment steel (weight percent meter) is C:0.18, Si:0.20, Mn:0.80, Al:0.04, Mo:0.50, and all the other are Fe and unavoidable impurities.
Molten steel is through converter smelting, and conduction of continuous casting becomes slab.Slab rolls into strip after 1290 ℃ of heating, the finishing temperature of strip is 880 ℃, within rolling in back 20 seconds, steel plate is cooled to 730 ℃ rapidly batches, and obtains yield strength Rp
0.2For 370MPa, tensile strength Rm are 560MPa, elongation A
50.8mm% is 36.0 coiled sheet.This coiled sheet enters continuously shaped operation subsequently, then carries out resistance welding (ERW) under bonding power 700KW, welding speed 20m/min, amount of compression 2mm condition.Shrend behind 850 ℃ of heat tracing 60min then, tempering behind 590 ℃ of heat tracing 100min is again carried out whole modified thermal treatment to welded tube.At last, manage processing, obtain yield strength Rp
0.2For 630MPa, tensile strength Rm are 820MPa, elongation A
50.8mm% is 26.0, the zero degree transverse impact is the high strength N80Q petroleum casing pipe of 85J.
Embodiment 5
The chemical composition content of present embodiment steel (weight percent meter) is C:0.22, Si:0.10, Mn:0.90, Al:0.05, Mo:0.40, and all the other are Fe and unavoidable impurities.
Molten steel is through converter smelting, and conduction of continuous casting becomes slab.Slab rolls into strip after 1300 ℃ of heating, the finishing temperature of strip is 900 ℃, within rolling in back 20 seconds, steel plate is cooled to 720 ℃ rapidly batches, and obtains yield strength Rp
0.2For 380MPa, tensile strength Rm are 576MPa, elongation A
50.8mm% is 33.0 coiled sheet.This coiled sheet enters continuously shaped operation subsequently, then carries out resistance welding (ERW) under bonding power 450KW, welding speed 8m/min, amount of compression 15mm condition.Shrend behind 880 ℃ of heat tracing 40min then, tempering behind 640 ℃ of heat tracing 55min is again carried out whole modified thermal treatment to welded tube.At last, manage processing, obtain yield strength Rp
0.2For 613MPa, tensile strength Rm are 810MPa, elongation A
50.8mm% is 25.0, the zero degree transverse impact is the high strength N80Q petroleum casing pipe of 90J.
Embodiment 6
The chemical composition content of present embodiment steel (weight percent meter) is C:0.34, Si:0.50, Mn:1.1, Al:0.01, Mo:0.30, and all the other are Fe and unavoidable impurities.
Molten steel is through converter smelting, and conduction of continuous casting becomes slab.Slab rolls into strip after 1200 ℃ of heating, the finishing temperature of strip is 800 ℃, within rolling in back 20 seconds, steel plate is cooled to 670 ℃ rapidly batches, and obtains yield strength Rp
0.2For 390MPa, tensile strength Rm are 556MPa, elongation A
50.8mm% is 37.0 coiled sheet.This coiled sheet enters continuously shaped operation subsequently, then carries out resistance welding (ERW) under bonding power 300KW, welding speed 5m/min, amount of compression 15mm condition.Shrend behind 860 ℃ of heat tracing 60min then, tempering behind 650 ℃ of heat tracing 90min is again carried out whole modified thermal treatment to welded tube.At last, manage processing, obtain yield strength Rp
0.2For 620MPa, tensile strength Rm are 801MPa, elongation A
50.8mm% is 24.0, the zero degree transverse impact is the high strength N80Q petroleum casing pipe of 65J.
Embodiment 7
The chemical composition content of present embodiment steel (weight percent meter) is C:0.30, Si:0.40, Mn:1.0, Al:0.03, Mo:0.20, and all the other are Fe and unavoidable impurities.
Molten steel is through converter smelting, and conduction of continuous casting becomes slab.Slab rolls into strip after 1220 ℃ of heating, the finishing temperature of strip is 880 ℃, within rolling in back 20 seconds, steel plate is cooled to 650 ℃ rapidly batches, and obtains yield strength Rp
0.2For 415MPa, tensile strength Rm are 580MPa, elongation A
50.8mm% is 36.0 coiled sheet.This coiled sheet enters continuously shaped operation subsequently, then carries out resistance welding (ERW) under bonding power 650KW, welding speed 13m/min, amount of compression 8mm condition.Shrend behind 950 ℃ of heat tracing 30min then, tempering behind 620 ℃ of heat tracing 55min is again carried out whole modified thermal treatment to welded tube.At last, manage processing, obtain yield strength Rp
0.2For 645MPa, tensile strength Rm are 801MPa, elongation A
50.8mm% is 23.0, the zero degree transverse impact is the high strength N80Q petroleum casing pipe of 90J.
Comparative example 1
The chemical composition content of this comparative example steel (weight percent meter) is C:0.10, Si:0.20, Mn:1.5, Nb:0.05, V:0.04, and all the other are Fe and unavoidable impurities.
Molten steel is through converter smelting, and conduction of continuous casting becomes slab.Slab rolls into strip after 1220 ℃ of heating, the finishing temperature of strip is 850 ℃, within rolling in back 20 seconds, steel plate is cooled to 580 ℃ rapidly batches, and obtains yield strength Rp
0.2For 600MPa, tensile strength Rm are 760MPa, elongation A
50.8mm% is 22.0 coiled sheet.
Comparative example 2
The chemical composition content of this comparative example steel (weight percent meter) is C:0.15, Si:0.30, Mn:1.4, Nb:0.05, V:0.03, and all the other are Fe and unavoidable impurities.
Molten steel is through converter smelting, and conduction of continuous casting becomes slab.Slab rolls into strip after 1250 ℃ of heating, the finishing temperature of strip is 860 ℃, within rolling in back 20 seconds, steel plate is cooled to 560 ℃ rapidly batches, and obtains yield strength Rp
0.2For 610MPa, tensile strength Rm are 780MPa, elongation A
50.8mm% is 23.0 coiled sheet.
As can be seen, adopt molten steel of the present invention after smelting, in rolling, the coiling temperature scope of regulation, to roll into hot-rolled sheet coil, the yield strength of its mechanical property is easy to moulding all less than 415MPa, and postwelding satisfies the requirement of N80Q tubing and casing by its performance of homogeneous tube thermal treatment simultaneously.And do not adopt comparative example of the present invention, can't realize the object of the invention.
Claims (4)
1. the manufacture method of a N80Q grade of steel straight welding oil annular tube, comprise smelting, casting, rolling, cool off, coil into plate, continuously shaped, resistance welding, homogeneous tube thermal treatment and pipe processing, it is characterized in that:
Its chemical ingredients of described sleeve pipe is as follows by weight percentage: C:0.15～0.35, Si:0.1～0.5, Mn:0.8～1.5, Al:0.01～0.05, Mo:0.1～0.5, and all the other are Fe and unavoidable impurities;
Cooling time≤20s in the cooling step of described method is cooled to 650～750 ℃ and batches; The homogeneous tube thermal treatment process of described method is 850～950 ℃ of heat tracing 20～60min, 550～650 ℃ of heat tracing 40～100min after the shrend, tempering.
2. manufacture method as claimed in claim 1 is characterized in that, describedly coils into the roll bending that plate obtains yield strength 320～420MPa.
3. manufacture method as claimed in claim 1 is characterized in that, temperature is 1200～1300 ℃ in the described rolling step, 800～900 ℃ of finishing temperatures.
4. manufacture method as claimed in claim 1 is characterized in that, bonding power 300～700KW in the described resistance-welding process, welding speed 5～20m/min, amount of compression 2～15mm.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2007100453321A CN101376943B (en) | 2007-08-28 | 2007-08-28 | Manufacturing method of straight welding petroleum casing pipe of steel for 80ksi steel grade |
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| CN2007100453321A CN101376943B (en) | 2007-08-28 | 2007-08-28 | Manufacturing method of straight welding petroleum casing pipe of steel for 80ksi steel grade |
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| CN101376943A CN101376943A (en) | 2009-03-04 |
| CN101376943B true CN101376943B (en) | 2011-07-20 |
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Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101845583B (en) * | 2009-03-25 | 2015-04-01 | 宝山钢铁股份有限公司 | Petroleum sleeve steel and manufacturing method thereof |
| CN102261521B (en) * | 2010-05-25 | 2014-04-30 | 宝山钢铁股份有限公司 | 80Ksi steel grade wearing-resisting sleeve pipe and manufacturing method thereof |
| CN102839324B (en) * | 2011-06-24 | 2014-07-23 | 宝山钢铁股份有限公司 | Steel for high-frequency resistance welding petroleum casing pipe, casing pipe and manufacturing method thereof |
| CN102936682A (en) * | 2012-11-16 | 2013-02-20 | 内蒙古包钢钢联股份有限公司 | Production method of N80Q steel-grade oil casings |
| CN105177416B (en) * | 2015-09-11 | 2017-03-29 | 山东钢铁股份有限公司 | A kind of furnace shell heat-resisting steel plate of pressure vessel and its manufacture method |
| CN114160944B (en) * | 2020-09-11 | 2023-03-31 | 宝山钢铁股份有限公司 | Weld joint thickness prediction method for narrow lap resistance welding machine |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003129179A (en) * | 2001-10-19 | 2003-05-08 | Sumitomo Metal Ind Ltd | Electroseamed steel pipe for boiler and manufacturing method therefor |
| CN1780929A (en) * | 2003-05-28 | 2006-05-31 | 住友金属工业株式会社 | Oil well steel pipe to be placed under ground and be expanded |
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- 2007-08-28 CN CN2007100453321A patent/CN101376943B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003129179A (en) * | 2001-10-19 | 2003-05-08 | Sumitomo Metal Ind Ltd | Electroseamed steel pipe for boiler and manufacturing method therefor |
| CN1780929A (en) * | 2003-05-28 | 2006-05-31 | 住友金属工业株式会社 | Oil well steel pipe to be placed under ground and be expanded |
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