CN102660711A - Steel for petroleum casing connecting piece and manufacturing method thereof - Google Patents
Steel for petroleum casing connecting piece and manufacturing method thereof Download PDFInfo
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Abstract
The invention discloses steel for a petroleum casing connecting piece and a manufacturing method thereof, and belongs to the technical field of metallurgy. The steel for the petroleum casing connecting piece comprises the following chemical ingredients in percentage by mass: 0.28 to 0.33 percent of C, 0.20 to 0.35 percent of Si, 0.45 to 0.60 percent of Mn, less than or equal to 0.025 percent of P, less than or equal to 0.025 percent of S, 0.90 to 1.10 percent of Cr, 0.18 to 0.25 percent of Mo, 0.020 to 0.050 percent of alt, less than or equal to 0.25 percent of Cu, less than or equal to 2.0*10<4> percent of H, 40*10<4> to 70*10<4> percent of N, less than or equal to 15*10<4> percent of T.O and the balance of Fe and inevitable impurities. The manufacturing method comprises the following production processes: an initial refining process of an electric furnace, a refining process of a ladle furnace (LF), a vacuum degassing (VD) process, a continuous casting process, a casting blank slow cooling process and an inspection and finishing process. The cleanliness, tissue compactness and uniformity of continuous casting round billets for the petroleum casing connecting piece are improved greatly, and the requirement of the steel for the petroleum casing connecting piece is met.
Description
Technical field
The invention belongs to metallurgical technology field, relate to a kind of petroleum casing pipe web member with steel and method of manufacture thereof.
Background technology
Oil work has the vital role that can not be substituted as " industrial blood " in guaranteeing Economic development, along with developing rapidly of oil work, oil development develops to directions such as deep-well, ultra deep well, big displacements.Petroleum casing pipe is a kind of key equipment that is widely used in field of petroleum exploitation, and it mainly acts on is the fixed oil borehole wall.Because the singularity of process for petroleum recovery, the quality of petroleum casing pipe directly has influence on the production safety of oil well, and the telescopic outside will be born ground, all kinds of bottoms stratum and pressed and groundwater pressure; Mud then will be born in telescopic inside; The interior pressure and water vapour pressure, therefore the erosion that also will bear corrosive liquid and gas sometimes requires petroleum casing pipe should have good comprehensive mechanical property; High anti-extrusion strength at break promptly to be arranged, the ys of internal pressure-resistant is arranged again.Petroleum casing pipe web member (muff joint, four-way junction of casing etc.) is that petroleum casing pipe is connected with each other, and the parts in the lower going-into-well are being draped to the dark tubing string of several kms from well head.All must support the following weight that hangs tubing string for each telescopic joint, also will bear the comprehensive action of the various load such as drawing, press, turn round, bend under the working conditions, therefore, HS is one of most important performance requriements; Simultaneously, drilling rod and sleeve pipe are radially, axial rub makes drilling-rod external wall and internal surface of sleeve pipe heavy wear, and this wearing and tearing pilosity is born in drilling rod and telescopic connecting portion, therefore, require to have stronger wear resistance again; Ore deposit, oil well ground is complicated, requires erosion resistance strong.In a word, the petroleum casing pipe web member requires the intensity of steel high with steel, and steel is even, and erosion resistance is strong, and wear resistance is good.
Middle carbon Cr-Mo is modified structural alloy steel, has good use properties and processing characteristicies such as height ratio is strong, high firmly, high-ductility, good hardening capacity, easy processing, becomes the petroleum casing pipe web member and uses the steel normal steels.Because the petroleum casing pipe web member is harsh with the specification of quality of steel, its forging requires to guarantee to satisfy high-grade flaw detection.Current, the user mainly adopts steel ingot to be used as the forging raw material, but because steel ingot exists lumber recovery low, and problems such as dense structure's property, homogeneity of ingredients difference cause the quality stability of forging low, scrap rate is high, raw materials cost increases.Therefore, the user urgently hopes to replace steel ingot as the forging raw material with continuous cast round billets, improves forging quality, reduces production costs, but cleanliness factor, the compactness of tissue, the homogeneity of continuous cast round billets molten steel all proposed high requirement.
Summary of the invention
The present invention is directed to the deficiency of prior art, provide a kind of petroleum casing pipe web member to use steel, this petroleum casing pipe web member is high with steel cleanness, stable components;
The present invention also provides a kind of petroleum casing pipe web member to use continuous cast round billets, and above-mentioned petroleum casing pipe web member exists with the form of steel with continuous cast round billets, is used to make the petroleum casing pipe web member, this continuous cast round billets surface quality, dense structure's property, homogeneity height;
The present invention also provides the preparation method of a kind of petroleum casing pipe web member with continuous cast round billets.The petroleum casing pipe web member that obtains through this method all improves a lot with cleanliness factor, dense structure's property, the homogeneity of continuous cast round billets, satisfies the petroleum casing pipe web member and uses the steel requirement.
Above-mentioned petroleum casing pipe web member uses the chemical ingredients of steel to be by mass percentage: C:0.28%～0.33%, Si:0.20%～0.35%, Mn:0.45%～0.60%, P≤0.025%, S≤0.025%, Cr:0.90%～1.10%, Mo:0.18%～0.25%, Al
t: 0.020%～0.050%, Cu≤0.25%, H≤2.0 * 10
-4%, N:40 * 10
-4%～70 * 10
-4%, T.O≤15 * 10
-4%, surplus is Fe and unavoidable impurities.
Wherein, Al
tBe meant full aluminium; T.O is meant total oxygen.
Below will the Design Mechanism of staple of the present invention be elaborated:
C: improve the intensity and the hardness of steel, reduction is moulded, toughness.Carbon content is lower than 0.28%, is difficult for reaching strong, hardness requirement, increases the alloy consumption; Be higher than 0.33% be difficult to satisfy mould, toughness reguirements, and overheated when being prone to cause component segregation of continuous casting slab with heating.
Si: improve intensity, the hardening capacity of steel, minimum content could play useful effect at 0.20% o'clock; When content was higher, tempering be prone to produce greying, and was prone to make and forms banded structure in the steel, increased the anisotropy of steel, reduced comprehensive mechanical property.
Mn: obviously improve the hardening capacity of steel, the refine pearlite tissue improves mechanical property, and content is lower than 0.45% can not satisfy the steel grade performance requriements; During too high levels, increase grain coarsening and be inclined to temper brittleness and component segregation of continuous casting slab, designing high-content is 0.60%.
P, S: improve the cutting ability of steel, significantly reduce the plasticity and the toughness of steel, increase the tendency that steel cracks, worsen the comprehensive mechanical property of steel, content is more obvious above 0.025% o'clock, should reduce its content as far as possible.
Cr: obviously improve the intensity and the hardening capacity of steel, improve wear resistance and resistance to corrosion simultaneously, but too high levels, the easy temper brittleness that increases steel; According to the requirement of steel grade use properties, design chromium content is 0.90%～1.10%.
Mo: significantly improve hardening capacity, impelling strength and the corrosion resistance nature of steel, improve temper resistance.It is not obvious that content is lower than 0.18% effect, will increase production cost during too high levels.
Al
t: main crystal grain thinning, deoxidation, fixed nitrogen, improve the toughness of steel, improve the comprehensive mechanical property of steel, content is lower than 0.020% can not play useful effect; Content is higher than at 0.050% o'clock, is prone to cause secondary oxidation, reduces Molten Steel Flow property, worsens the quality of steel.
Cu: as the harmful residual element in the steel, content is higher than at 0.25% o'clock, reduces the moulding of steel, toughness, and continuously cast bloom is prone to produce star-like crack.
T.O: content increases, and the cleanliness factor of steel reduces, and steel inclusion increases, and total oxygen content is higher than 15 * 10
-4During %, will reduce significantly that steel is moulded, toughness and fatigue property, worsen the comprehensive mechanical property of steel.
H: content is higher than 2.0 * 10
-4%, steel are prone to produce white point, spot segregation, repeated stress failure etc., significantly worsen the quality of steel, even cause steel to scrap.
N: can improve the intensity of steel, combine with Al to generate the AlN crystal grain thinning, content is higher than 40 * 10
-4Can play useful effect during %, but content is higher than 70 * 10
-4To increase steel inclusion during %, significantly worsen the toughness of steel, and make steel be prone to produce blue shortness.
This petroleum casing pipe web member exists with the form of steel with continuous cast round billets, is used to make the petroleum casing pipe web member.
Above-mentioned petroleum casing pipe web member provided by the invention comprises following production process with the method for manufacture of continuous cast round billets: electric furnace just refines operation → LF refining procedure → VD vacuum outgas operation → continuous casting working procedure → strand slow cooling operation → check, finishing procedure; Wherein,
Just refine in the operation at said electric furnace, the mass percent of molten iron accounts for 50%～75% in the burden structure; Said electric furnace just refines to accomplish and carries out in the process of slag free tapping, in ladle, adds carbon dust in advance according to actual endpoint carbon content, adds the mixing slag making material that fritting lower melting point slag supplying agent and lime are formed then.
Just refine in the operation at said electric furnace, add said mixing slag making material after, add alloy again and contain aluminium deoxidizer, wherein, said alloy is at least a in silicomanganese, ferrochrome or the molybdenum-iron, the said add-on that contains aluminium deoxidizer is 1.5kg/t steel～2.0kg/t steel.
In said LF refining procedure, refining furnace adopts the LF stove, adopts carbon dust and silit diffusive deoxidation and the feeding strong deoxidation of aluminum steel complex deoxidization mode deoxidation mutually, and before the tapping, the feeding silicon-calcium wire is done rotten the processing and deep deoxidation to inclusion.
Behind said LF refining procedure be LF stove tapping back and get into said VD vacuum outgas operation before the operation of skimming, take off the 30%-60% that the quantity of slag accounts for total slag weight.
In said VD vacuum outgas operation, be 15min～20min in the following hold-time of vacuum tightness 67Pa, H after the vacuum-treat≤2.0 * 10
-4Wt%, molten steel are after atmospheric pressure state is got back in vacuum refinement, and control argon bottom-blowing flow is 120L/min～260L/min, and pressure is 0.20MPa～0.40MPa, and keeping the soft blow time is 15min～30min, and wherein, the soft blow state is top of the slag fine motion, and molten steel is not exposed.
In said continuous casting working procedure; Carry out " three perseverances " operation of constant temperature, permanent pulling rate, constant level; The built-in mouth of a river of employing Argon sealing big bag long nozzle+tundish+Argon sealing submerged nozzle, ladle and tundish are all added a cover the full guard low overheat cast of insulation, the tundish molten steel face employing high basicity insulating covering agent of low-carbon (LC) and carbonization rice husk double-layer heat insulation, and mold liquid level is controlled automatically, terminal induction stirring; Cold water distribution dynamically, multiple spot continuous straightening technology.
In said strand slow cooling operation, continuous cast round billets through secondary cooling zone cooling, rectify put, transport the rod road and be transferred to cold bed after, in time change the burial pit slow cooling over to, and add a cover insulation, slow cooling time>=36h hangs out temperature≤250 ℃.
Beneficial effect of the present invention is following:
(1) electric furnace adopts with addition of adding an amount of carbon dust deoxidation in advance behind molten iron, the stove at high proportion; Add the mixing slag making material that fritting lower melting point slag making material and lime are formed; Carry out the slag upgrading, add aluminium matter reductor and strengthen technique means such as preliminary dexidation, reduce dissolved oxygen content in the steel as early as possible; The utmost point is slagging early, for refining furnace creates good conditions;
(2) the LF refining utilizes technology and vacuum deaeration refinings such as mutually complex deoxidization mode deoxidation of carbon dust+silit diffusive deoxidation and feeding aluminum steel strong deoxidation, the refining of high basicity refining slag, narrow Composition Control, stirs and formulates, guarantees that measures such as enough vacuum outgas time, soft blow time have guaranteed molten steel cleanness, ingredient stability through formulating reasonable Argon.
(3) continuous casting is through adopting " three permanent operations ", the cast of full guard low overheat, and mold liquid level is controlled automatically, terminal induction stirring; Cold water distribution dynamically; The multiple spot continuous straightening is gone into the burial pit slow cooling, is added a cover technology such as insulation, has guaranteed continuous cast round billets surface quality, cleanliness factor, homogeneity of structure and compactness; Reduce structural stress and thermal stresses, avoided the generation of internal fissure.
(4) adopt above-mentioned preparation method can produce high (T.O≤15 * 10 of birth cleanliness factor
-4%, N:40 * 10
-4%～70 * 10
-4%, non-metallic inclusion A, B, C, D≤1.0 grade), the continuous cast round billets of homogeneous (macrostructure≤1.0 grade, flawless, subsurface bubble) satisfies the petroleum casing pipe web member and guarantees high-grade flaw detection requirement with steel forgings.
Embodiment
Through embodiment the present invention is elaborated below, but protection scope of the present invention is not limited to following embodiment.
A kind of petroleum casing pipe web member provided by the invention is used steel, and its chemical ingredients according to mass percent is: C:0.28%～0.33%, Si:0.20%～0.35%; Mn:0.45%～0.60%, P≤0.025%, S≤0.025%; Cr:0.90%～1.10%, Mo:0.18%～0.25%, Al
t: 0.020%～0.050%, Cu≤0.25%, H≤2.0 * 10
-4%, N:40 * 10
-4%～70 * 10
-4%, T.O≤15 * 10
-4%, surplus is Fe and unavoidable impurities.
As a kind of preferred implementation of the present invention, said petroleum casing pipe web member is used steel, and its chemical ingredients according to mass percent is: C:0.29%～0.31%; Si:0.20%～0.28%, Mn:0.50%～0.56%, P≤0.015%; S≤0.010%; Cr:1.00%～1.10%, Mo:0.18%～0.22%, Al
t: 0.020%～0.040%, Cu≤0.25%, H≤2.0 * 10
-4%, N:40 * 10
-4%～70 * 10
-4%, T.O≤15 * 10
-4%, surplus is Fe and unavoidable impurities.
The present invention also provides a kind of petroleum casing pipe web member to use continuous cast round billets, and promptly above-mentioned petroleum casing pipe web member exists with the form of steel with continuous cast round billets, is used to make the petroleum casing pipe web member.
Petroleum casing pipe web member provided by the invention comprises following production process with the preparation method of continuous cast round billets: electric furnace just refines operation → LF refining procedure → VD vacuum outgas operation → continuous casting working procedure → strand slow cooling operation → check, finishing procedure;
Following per-cent then is not mass percent as there being specified otherwise.
Electric furnace just refines operation: adopt the burden structure of steel scrap and molten iron, wherein, the mass percent of molten iron accounts for 50%～75%; Four wall lance oxygen decarburizations are main, and the decarburization of a fire door oxygen gun blowing is auxilliary; Combine winding-up carbon dust or other carbon containing pulvis making foamed slags with oxygen blast; With addition of slag making material such as lime slag making dephosphorization; Eccentric bottom tapping stays steel to stay slag operation; In the tapping process, argon bottom-blowing stirs;
Preferably, the mass percent of molten iron accounts for 55%～75% in the burden structure;
Preferably, when winding-up carbon dust or other carbon containing pulvis making foamed slags, the per-cent that mixed carbon comtent accounts for the furnace charge gross weight is 1.00%～4.00%, specifically depends on burden structure and charge composition;
Preferably, furnace charge per ton melts clear carbon>=0.60% with addition of 35kg～50kg lime slag making dephosphorization; Such as 0.6～1.5%, preferably 0.8～1.2%, more preferably 0.9～1.1%; Molten clear phosphorus≤0.025%, the simultaneous oxidation decarburization balances the boiling, and removes section H and N in the steel; Control is furnace smelting endpoint C:0.12%～0.20% just, P≤0.015%, and tapping temperature is 1620 ℃～1660 ℃;
Preferably, said electric furnace is a basic electric arc furnace;
Just refine in the operation at said electric furnace, said electric furnace just refines to accomplish and carries out in the slag free tapping process, and tapping process is along steel stream; In ladle, add carbon dust in advance according to actual endpoint carbon content, add the mixing slag making material that fritting lower melting point slag supplying agent and lime are formed then, wherein; Fritting lower melting point slag supplying agent mixes by weight being preferably with 1: 1 with lime in the said mixing slag making material; And the add-on of said mixing slag making material is 10kg/t steel～15kg/t steel in the ladle, preferably, comprises following component in the said fritting lower melting point slag supplying agent; And the mass percent of each component is CaO:40wt%～60wt%, SiO
2: 4wt%～20wt%, Al
2O
3: 15wt%～35wt%, MgO:5wt%～15wt%; After adding said mixing slag making material, add alloy again and contain aluminium deoxidizer, wherein, said alloy is one or more in silicomanganese, ferrochrome and the molybdenum-iron, but the invention is not restricted to this, and concrete alloy adds kind and add-on is decided according to the composition of steel; The said add-on that contains aluminium deoxidizer is 1.5kg/t steel～2.0kg/t steel; Carrying out Argon in the slag free tapping process stirs; It is 1.40MPa～0.80Mpa that tapping early stage, mid-term are controlled argon pressure; Later stage control argon pressure is 0.60MPa～0.20Mpa, and tapping finishes before the back goes to the refining station to molten steel, and the control argon flow amount is for making top of the slag fine motion.
The LF refining procedure: refining furnace adopts the LF stove; Molten steel temperature is controlled at 1500～1550 ℃ to furnaceman LF position, is preferably 1530～1550 ℃, molten steel at refining furnace through sending operations such as electrochemical slag, residue adjustment, line feeding, stirring; Accomplish deoxidation, desulfurization; Removal is mingled with, adjustment composition, treating processess such as controlled temperature.Adopt carbon dust and silit diffusive deoxidation, and before analyzing once appearance, feed the complex deoxidization mode deoxidation of the strong deoxidation phase of aluminum steel, close on tapping before; The feeding silicon-calcium wire is done rotten the processing and deep deoxidation to inclusion; Wherein, the weight ratio of said carbon dust and silit is 1: 1～5: 1, and consumption is 1kg/t steel～2kg/t steel; Said aluminum steel consumption is 0.8kg/t steel～1.0kg/t steel, and said silicon-calcium wire consumption is 0.010kg/t steel-0.015kg/t steel.Tapping temperature is controlled at 1600～1650 ℃, is preferably 1600～1620 ℃.
Preferably, in said LF refining procedure, LF refining white slag hold-time>=20min, the preferred hold-time is 25～35min, control finishing slag staple mass percent: CaO:45%～55%, SiO
2: 10%～15%, Al
2O
3: 15%～25%, FeO+MnO≤1.0%, MgO:6%～10%.
Preferably, in said LF refining procedure, the refining of LF stove makes molten steel implement narrow Composition Control, same batch: C: ± 0.01%, and Si: ± 0.03%, Mn, Cr: ± 0.02%, Mo: ± 0.01%, Al: ± 0.005%.
After the tapping of LF stove, also to take off slag operation before the entering VD vacuum outgas operation, take off the 30%-60% that the quantity of slag is total slag amount;
VD vacuum outgas operation: vacuum refining furnace adopts the VD stove, mainly accomplishes molten steel and takes off H, and further promote inclusion floating, cleaning molten steel.Ladle is to furnaceman VD position, and thermometric vacuumizes and carries out the vacuum outgas processing, is 15min～20min in the following hold-time of vacuum tightness 67Pa, H after the vacuum-treat≤2.0 * 10
-4Wt%;
Molten steel is after atmospheric pressure state is got back in vacuum refinement, and the treatment stage of getting into soft blow, control argon bottom-blowing flow is 120L/min～260L/min; Pressure is 0.20MPa～0.40Mpa, and keeping the soft blow time is 15min～30min, wherein; The soft blow state is top of the slag fine motion, and molten steel is not exposed.
Continuous casting working procedure: carry out " three perseverances " operation of constant temperature, permanent pulling rate, constant level; The big bag of employing Argon sealing long nozzle, the built-in mouth of a river of tundish and Argon sealing submerged nozzle, ladle and tundish are all added a cover the full guard low overheat cast of insulation, the tundish molten steel face employing high basicity insulating covering agent of low-carbon (LC) and carbonization rice husk double-layer heat insulation; Mold liquid level is controlled automatically; Terminal induction stirring, dynamically a little less than cold water distribution, multiple spot continuous straightening technology;
Preferably, in said continuous casting working procedure, normally pour into a mould tundish molten steel liquid level 850mm～900mm; Terminal electricity stirs mixing parametric: 400A/18.0HZ, and 15 ℃～25 ℃ of molten steel cast superheating temperature, each section of continuous casting cooling water yield partition ratio is: sufficient roller section 30%; Two cold one section 24%, two cold two section 19%, two cold three section 15%; Two cold four section 12%, specific water 0.30L/kg～0.35L/kg;
Preferably, adopt the continuous straightening machine of embedding formula five frames, strand straightening temperature >=910 ℃, such as 910～950 ℃, preferred strand straightening temperature is 915～925 ℃, when specifications section was Ф 350mm, pulling rate was controlled at 0.35-0.42m/min.
Strand slow cooling operation: continuous cast round billets through secondary cooling zone cooling, rectify put, transport the rod road and be transferred to cold bed after, in time change the burial pit slow cooling over to, and add a cover insulation; Slow cooling time>=36h; The preferred slow cooling time is 40～48h, hangs out temperature≤250 ℃, is preferably 200～150 ℃.
Check, finishing procedure: the surface quality of inspection continuous cast round billets and to internal soundness analysiss of testing, and continuous cast round billets surface and end carried out finishing polishing processing.
Below be to adopt different technical parameters to prepare the specific embodiment of petroleum casing pipe web member of the present invention with continuous cast round billets, totally four embodiment are numbered 1#, 2#, 3#, 4# by the continuous casting heat.
1, electric arc furnace just refines in the operation, and the major control processing parameter of four embodiment is seen table 1,2.
The first refining process of table 1 electric arc furnace main technologic parameters
The main technologic parameters of tapping after table 2 electric arc furnace just refines and accomplishes
2, LF refining procedure, major control processing parameter and the finishing slag staple of four embodiment are listed in table 3 and table 4 respectively
Table 3LF refining major control processing parameter
Table 4LF refining finishing slag staple (mass percent, %)
3, in the VD vacuum outgas operation, the major control processing parameter of four embodiment is listed in table 5, and wherein, ladle is gone into before the VD stove, removes the refining slag of 50wt%.
Table 5VD stove vacuum refinement control process parameters
4, in the continuous casting working procedure, four embodiment all adopt full arc shape three machines three stream sides/circle base alloy steel continuous casting machine continuous casting, and arc radius is R12m; Circle base specification is Ф 350mm, normally pours into a mould tundish molten steel liquid level 850mm～900mm, and mold liquid level is controlled automatically; Terminal stirring parameter: 400A/18.0HZ, 15 ℃～25 ℃ of molten steel cast superheating temperature, dynamically cold water distribution a little less than gas one fog cooling; Cooling off each section water yield partition ratio is: sufficient roller section 30%, two cold a section 24%, two cold two section 19%; Two cold three section 15%, two cold four section 12%; Adopt 4 continuous casting alignings of embedding formula six frames straightening machine, the strand straightening temperature reaches 920 ℃, and other control process parameters are seen table 6.
Table 6 continuous casting control process parameters
5, strand slow cooling operation
Continuous cast round billets through secondary cooling zone cooling, rectify put, transport the rod road and be transferred to cold bed after, in time change the burial pit slow cooling over to, and add a cover insulation, slow cooling time 48h hangs out 200 ℃～150 ℃ of temperature.
Below be the chemical ingredients of the petroleum casing pipe web member of four embodiment acquisitions, see table 7 with continuous cast round billets; And four Ф 350mm continuous cast round billets steel low power, examination of nonmetallic inclusion results that embodiment produces, see table 8, table 9.
Composition in table 7 steel of the present invention (mass percent, %)
By table 7; Can find out that producing the petroleum casing pipe web member with preparation method of the present invention stablizes with chemical Composition Control in the continuous cast round billets steel, the refining of LF stove makes molten steel realize narrow Composition Control, same batch: C: ± 0.01%; Si: ± 0.03%; Mn, Cr: ± 0.02%, Mo: ± 0.01%, Al: ± 0.005%.
Table 8 continuous cast round billets macrostructure of the present invention (level)
Table 9 continuous cast round billets non-metallic inclusion of the present invention (level)
Can be found out by table 8 and table 9: preparation method of the present invention produces the petroleum casing pipe web member and has dense structure, even with continuous cast round billets, and cleanliness factor is than characteristics such as height.
Claims (19)
1. a petroleum casing pipe web member is used steel, it is characterized in that, this petroleum casing pipe web member uses the chemical ingredients of steel according to mass percent to be:
C:0.28%～0.33%, Si:0.20%～0.35%, Mn:0.45%～0.60%, P≤0.025%, S≤0.025%, Cr:0.90%～1.10%, Mo:0.18%～0.25%, Al
t: 0.020%～0.050%, Cu≤0.25%, H≤2.0 * 10
-4%, N:40 * 10
-4%～70 * 10
-4%, T.O≤15 * 10
-4%, surplus is Fe and unavoidable impurities.
2. petroleum casing pipe web member according to claim 1 is used steel, it is characterized in that, this petroleum casing pipe web member uses the chemical ingredients of steel according to mass percent to be:
C：0.29%～0.31%，?Si:0.20%～0.28%， Mn：0.50%～0.56%
P≤0.015%， S≤0.010%， Cr：1.00%～1.10%，
Mo：0.18%～0.22%，Al
t：0.020%～0.040%， Cu≤0.25%，
H≤2.0×10
-4%， N：40×10
-4%～70×10
-4%，T.O≤15×10
-4%，
Surplus is Fe and unavoidable impurities.
3. petroleum casing pipe web member according to claim 1 and 2 is used steel, it is characterized in that, this petroleum casing pipe web member exists with the form of steel with continuous cast round billets, is used to make the petroleum casing pipe web member.
4. a petroleum casing pipe web member is with the method for manufacture of continuous cast round billets, and comprise following production process: electric furnace just refines operation → LF refining procedure → VD vacuum outgas operation → continuous casting working procedure → strand slow cooling operation → check, finishing procedure, it is characterized in that,
Said petroleum casing pipe web member is the described round base of claim 3 with continuous cast round billets;
Just refine in the operation at said electric furnace, the mass percent of molten iron accounts for 50%～75% in the burden structure; Said electric furnace just refines to accomplish and carries out in the process of slag free tapping, in ladle, adds carbon dust in advance according to actual endpoint carbon content, adds the mixing slag making material that fritting lower melting point slag supplying agent and lime are formed then.
5. method of manufacture according to claim 4; It is characterized in that: just refine in the operation at said electric furnace; Fritting lower melting point slag supplying agent mixes by weight 1: 1 with lime in the said mixing slag making material, and the add-on of said mixing slag making material is 10kg/t steel～15kg/t steel in the ladle.
6. according to claim 4 or 5 described method of manufacture, it is characterized in that: just refine in the operation at said electric furnace, comprise following component in the said fritting lower melting point slag supplying agent, each component is CaO:40wt%～60wt% by mass percentage, SiO
2: 4wt%～20wt%, Al
2O
3: 15wt%～35wt%, MgO:5wt%～15wt%.
7. method of manufacture according to claim 4; It is characterized in that: just refine in the operation at said electric furnace; After adding said mixing slag making material, add alloy again and contain aluminium deoxidizer, wherein; Said alloy is at least a in silicomanganese, ferrochrome or the molybdenum-iron, and the said add-on that contains aluminium deoxidizer is 1.5kg/t steel～2.0kg/t steel.
8. method of manufacture according to claim 4; It is characterized in that: just refine in the first refining process of electric furnace of operation at said electric furnace; Mixed carbon comtent is 1.00wt%～4.00wt%, molten clear carbon>=0.60wt%, molten clear phosphorus≤0.025wt%; Smelting endpoint C:0.12wt%～0.20wt%, P≤0.015wt%, tapping temperature is 1620 ℃～1660 ℃.
9. method of manufacture according to claim 4; It is characterized in that: just refine in the operation at said electric furnace; Carry out Argon in the tapping process and stir, it is 1.40MPa～0.80MPa that the early stage of tapping, mid-term are controlled argon pressure, and later stage control argon pressure is 0.60MPa～0.20MPa; Tapping finishes before the back goes to the refining station to molten steel, and the control argon flow amount is for making top of the slag fine motion.
10. method of manufacture according to claim 4; It is characterized in that: in said LF refining procedure; Refining furnace adopts the LF stove; Adopt carbon dust and silit diffusive deoxidation and the feeding strong deoxidation of aluminum steel complex deoxidization mode deoxidation mutually, before the tapping, the feeding silicon-calcium wire is done rotten the processing and deep deoxidation to inclusion.
11. method of manufacture according to claim 10; It is characterized in that: the weight ratio of said carbon dust and silit is 1: 1～5: 1; And consumption is 1kg/t steel～2kg/t steel; Said aluminum steel consumption is 0.8kg/t steel～1.0kg/t steel, and said silicon-calcium wire consumption is 0.010kg/t steel-0.015kg/t steel.
12. method of manufacture according to claim 4 is characterized in that: in said LF refining procedure, LF refining white slag hold-time>=20min, control finishing slag staple mass percent: CaO:45%～55%, SiO
2: 10%～15%, Al
2O
3: 15%～25%, FeO+MnO≤1.0%, MgO:6%～10%.
13. method of manufacture according to claim 4 is characterized in that: in said LF refining procedure, the refining of LF stove makes molten steel implement narrow Composition Control; Same batch: C: ± 0.01%, Si: ± 0.03%, Mn, Cr: ± 0.02%; Mo: ± 0.01%, Al: ± 0.005%.
14. method of manufacture according to claim 4 is characterized in that: behind said LF refining procedure be LF stove tapping back and get into said VD vacuum outgas operation before the operation of skimming, take off the 30%-60% that the quantity of slag accounts for total slag weight.
15. method of manufacture according to claim 4 is characterized in that: in said VD vacuum outgas operation, be 15min～20min in the following hold-time of vacuum tightness 67Pa, H after the vacuum-treat≤2.0 * 10
-4Wt%, molten steel are after atmospheric pressure state is got back in vacuum refinement, and control argon bottom-blowing flow is 120L/min～260L/min, and pressure is 0.20MPa～0.40MPa, and keeping the soft blow time is 15min～30min, and wherein, the soft blow state is top of the slag fine motion, and molten steel is not exposed.
16. method of manufacture according to claim 4; It is characterized in that: in said continuous casting working procedure; Carry out " three perseverances " operation of constant temperature, permanent pulling rate, constant level; The built-in mouth of a river of employing Argon sealing big bag long nozzle+tundish+Argon sealing submerged nozzle, ladle and tundish are all added a cover the full guard low overheat cast of insulation, the tundish molten steel face employing high basicity insulating covering agent of low-carbon (LC) and carbonization rice husk double-layer heat insulation, and mold liquid level is controlled automatically, terminal induction stirring; Cold water distribution dynamically, multiple spot continuous straightening technology.
17. method of manufacture according to claim 16; It is characterized in that: in said continuous casting working procedure; Normal cast tundish molten steel liquid level is 850mm～900mm, and it is 400A/18.0HZ that terminal electricity stirs mixing parametric, and molten steel cast superheating temperature is 15 ℃～25 ℃; Each section of continuous casting cooling water yield partition ratio is: sufficient roller section 30%, two cold a section 24%, two cold two section 19%, two cold three section 15%, two cold four section 12%, the specific water is 0.30L/kg～0.35L/kg.
18. method of manufacture according to claim 16 is characterized in that: in said continuous casting working procedure, adopt 4 continuous castings alignings of embedding formula 6 frames straightening machine, strand straightening temperature >=910 ℃, when specifications section was Ф 350mm, pulling rate was controlled at 0.35-0.42m/min.
19. method of manufacture according to claim 4 is characterized in that: in said strand slow cooling operation, continuous cast round billets through secondary cooling zone cooling, rectify put, transport the rod road and be transferred to cold bed after; In time change the burial pit slow cooling over to; And adding a cover insulation, slow cooling time>=36h hangs out temperature≤250 ℃.
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| CN201210160645.2A CN102660711B (en) | 2012-05-23 | 2012-05-23 | Steel for petroleum casing connecting piece and manufacturing method thereof |
| CN201310468761.5A CN103572165B (en) | 2012-05-23 | 2012-05-23 | Petroleum casing pipe web member steel and manufacture method thereof |
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|---|---|
| CN103572165B (en) | 2015-09-23 |
| CN103572165A (en) | 2014-02-12 |
| CN102660711B (en) | 2014-03-26 |
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