CN103572165A - Steel for petroleum sleeve connecting piece and production method of steel - Google Patents
Steel for petroleum sleeve connecting piece and production method of steel Download PDFInfo
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- CN103572165A CN103572165A CN201310468761.5A CN201310468761A CN103572165A CN 103572165 A CN103572165 A CN 103572165A CN 201310468761 A CN201310468761 A CN 201310468761A CN 103572165 A CN103572165 A CN 103572165A
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Abstract
The invention discloses steel for a petroleum sleeve connecting piece and a production method thereof and belongs to the technical field of metallurgy. The steel for the petroleum sleeve connecting piece comprises the following chemical components in percent by mass: 0.29-0.30% of C, 0.25-0.28% of Si, 0.51-0.54% of Mn, 0.008-0.012% of P, 0.003-0.006% of S, 0.96-0.97% of Cr, 0.190-0.200% of Mo, 0.024-0.030% of Alt, 50*10<-4>-58*10<-4>% of N, 12*10<-4>-14*10<-4>% of T.O and balance of Fe and inevitable impurities. The production method of the steel for the petroleum sleeve connecting piece comprises the following production processes: electric furnace primary smelting, LF (low frequency) refining, VD (vacuum degassing), continuous casting, slowly cooling of a casting blank, testing and finishing. Cleanliness, tissue compactness and uniformity of a continuous casting round billet, obtained by adopting the production method, for the petroleum sleeve connecting piece are greatly improved, and requirements for the steel for the petroleum sleeve connecting piece are met.
Description
The application is to be dividing an application of on 05 23rd, 2012, application number are 201210160645.2, denomination of invention is " steel and manufacture method thereof for petroleum casing pipe web member " patent application the applying date.
Technical field
The invention belongs to metallurgical technology field, relate to steel and manufacture method thereof for a kind of petroleum casing pipe web member.
Background technology
Oil work has the vital role can not be substituted as " industry blood " in guaranteeing Economic development, and along with developing rapidly of oil work, oil development is to future developments such as deep-well, ultra deep well, large displacements.Petroleum casing pipe is a kind of key equipment that is widely used in field of petroleum exploitation, and its Main Function is fixing oil well wall.Singularity due to process for petroleum recovery, the quality of petroleum casing pipe directly has influence on the production safety of oil well, the outside of sleeve pipe will be born all kinds of bottoms stratum and be pressed and groundwater pressure, mud will be born in the inside of sleeve pipe, interior pressure and water vapour pressure, the erosion that sometimes also will bear corrosive liquid and gas, therefore requires petroleum casing pipe should have good comprehensive mechanical property, to there is high anti-extrusion strength at break, have again the yield strength of internal pressure-resistant.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 lower going-into-well, are being draped to the dark tubing string of several kms from well head.Must support the weight that below hangs tubing string for each telescopic joint, the comprehensive action of various load such as also will bearing drawing under working conditions, press, turn round, be curved, therefore, high strength is one of most important performance requriements; Meanwhile, drilling rod and sleeve pipe are radially, axial rub makes drilling-rod external wall and internal surface of sleeve pipe heavy wear, and therefore the multiple connecting portion of being born in drilling rod and sleeve pipe of this wearing and tearing, requires to have again stronger wear resistance; Ore deposit, oil well ground is complicated, requires erosion resistance strong.In a word, 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 the processing characteristicies such as high ratio is strong, high firmly, high-ductility, good hardening capacity, easy processing, becomes petroleum casing pipe web member steel normal steels.Because petroleum casing pipe web member is harsh with the specification of quality of steel, its forging requires to guarantee to meet high-grade flaw detection.Current, user mainly adopts steel ingot to be used as forging raw material, but because steel ingot exists the problems such as lumber recovery Di， dense structure property, homogeneity of ingredients be poor, cause the quality stability of forging low, scrap rate is high, raw materials cost increases.Therefore, user urgently wishes to replace steel ingot as forging raw material with continuous cast round billets, improves forging quality, reduces production costs, but the compactness of the cleanliness factor of continuous cast round billets molten steel, tissue, homogeneity are all proposed to high requirement.
Summary of the invention
The present invention is directed to the deficiencies in the prior art, a kind of petroleum casing pipe web member steel is provided, 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 continuous cast round billets, and with steel, the form with continuous cast round billets exists above-mentioned petroleum casing pipe web member, and for the manufacture of petroleum casing pipe web member, this continuous cast round billets surface quality, dense structure's property, homogeneity are high;
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 obtaining by the method all improves a lot by cleanliness factor, dense structure's property, the homogeneity of continuous cast round billets, meets the steel requirement of petroleum casing pipe web member.
Above-mentioned petroleum casing pipe web member by the chemical composition of steel is 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 inevitable impurity.
Wherein, Al
trefer to full aluminium; T.O refers to total oxygen.
Below the Design Mechanism to main component of the present invention is elaborated:
C: improve intensity and the hardness of steel, reduction is moulded, toughness.Carbon content, lower than 0.28%, is difficult for reaching strong, hardness requirement, increases alloy consumption; Higher than 0.33% be difficult to meet mould, toughness reguirements, and overheated while easily causing component segregation of continuous casting slab and heating.
Si: improve intensity, the hardening capacity of steel, minimum content could play useful effect 0.20% time; When content is higher, tempering easily produces greying, and easily makes to form banded structure in steel, increases the anisotropy of steel, reduces comprehensive mechanical property.
Mn: obviously improve the hardening capacity of steel, refine pearlite tissue, improves mechanical property, and content can not meet steel grade performance requriements lower than 0.45%; During too high levels, increase grain coarsening and temper brittleness and component segregation of continuous casting slab tendency, designing high-content is 0.60%.
P, S: improve the cutting ability of steel, significantly reduce plasticity and the toughness of steel, increase the tendency that steel cracks, worsen the comprehensive mechanical property of steel, more obvious when content surpasses 0.025%, should reduce its content as far as possible.
Cr: obviously improve intensity and the hardening capacity of steel, improve wear resistance and resistance to corrosion simultaneously, but too high levels, easily increase the temper brittleness of 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.Content is not obvious lower than 0.18% effect, during too high levels, will increase production cost.
Al
t: main crystal grain thinning, deoxidation, fixed nitrogen, improve the toughness of steel, improve the comprehensive mechanical property of steel, content can not play useful effect lower than 0.020%; Content higher than 0.050% time, easily causes secondary oxidation, reduces Molten Steel Flow, worsens the quality of steel.
Cu: as the harmful residual element in steel, content higher than 0.25% time, reduces the moulding of steel, toughness, and continuously cast bloom easily produces star-like crack.
T.O: content increases, the cleanliness factor of steel reduces, and steel inclusion increases, and total oxygen content is higher than 15 * 10
-4during %, will significantly reduce 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 easily produces white point, spot segregation, repeated stress failure etc., significantly worsens the quality of steel, even causes steel to scrap.
N: can improve the intensity of steel, be combined generate AlN crystal grain thinning with Al, content is higher than 40 * 10
-4during %, can play useful effect, but content is higher than 70 * 10
-4during %, will increase steel inclusion, significantly worsen the toughness of steel, and make steel easily produce blue shortness.
Preferably, described petroleum casing pipe web member by the chemical composition of steel according to mass percent is: C:0.29%～0.30%, Si:0.25%～0.28%, Mn:0.51%～0.54%, P:0.008%-0.012%, S:0.003%-0.006%, Cr:0.96%～0.97%, Mo:0.190%～0.200%, Al
t: 0.024%～0.030%, N:50 * 10
-4%～58 * 10
-4%, T.O:12 * 10
-4%～14 * 10
-4%, surplus is Fe and inevitable impurity.
With steel, the form with continuous cast round billets exists this petroleum casing pipe web member, for the manufacture of petroleum casing pipe web member.
The manufacture method of continuous cast round billets for above-mentioned petroleum casing pipe web member provided by the invention, comprises 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; Wherein,
At described electric furnace, just refine in operation, in burden structure, the mass percent of molten iron accounts for 50%～75%; Described electric furnace has just refined in the process of carrying out slag free tapping, according to actual endpoint carbon content, adds carbon dust in advance in ladle, the mixing slag material that then adds fritting low melting point slag supplying agent and lime to form.
At described electric furnace, just refine in operation, add after described mixing slag material, then add alloy and contain aluminium deoxidizer, wherein, described alloy is at least one in silicomanganese, ferrochrome or molybdenum-iron, and the described add-on containing aluminium deoxidizer is 1.5kg/t steel～2.0kg/t steel.
In described LF refining procedure, refining furnace adopts LF stove, adopts the complex deoxidization mode deoxidation of carbon dust and silicon carbide diffusive deoxidation and the strong deoxidation phase of feeding aluminum steel, and before tapping, feeding silicon-calcium wire is done rotten processing and deep deoxidation to inclusion.
After described LF refining procedure, be after LF stove tapping and enter described 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 described VD vacuum outgas operation, in the following hold-time of vacuum tightness 67Pa, be 15min～20min, H≤2.0 * 10 after vacuum-treat
-4wt%, molten steel is after atmospheric pressure state is got back in vacuum refinement, and controlling 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, soft blow state is top of the slag fine motion, and molten steel is not exposed.
In described continuous casting working procedure; carry out " three perseverances " operation of constant temperature, permanent pulling rate, constant level; adopt the built-in mouth of a river+argon blowing seal of the large bag long nozzle+tundish of argon blowing seal submerged nozzle, ladle and tundish all to add a cover the full guard Prepared by Low Superheat Pouring of insulation, tundish molten steel face employing low-carbon (LC) high alkalinity insulating covering agent and carbonization rice husk double-layer heat insulation; mold liquid level is controlled automatically; end induction stirring; dynamically weak cold water distribution, multiple spot continuous straightening technology.
In described strand slow cooling operation, continuous cast round billets is cooling through secondary cooling zone, rectify and put, transport rod road and be transferred to after cold bed, proceeds in time burial pit slow cooling, and adds a cover insulation, and slow cooling time >=36h, hangs out temperature≤250 ℃.
Beneficial effect of the present invention is as follows:
(1) electric furnace adopts with addition of adding in advance appropriate carbon dust deoxidation after molten iron, stove at high proportion, the mixing slag material that adds fritting low melting point slag material and lime to form, carry out slag modification, add the technique means such as aluminium matter reductor strengthening pre-deoxidation, reduce as early as possible dissolved oxygen content in steel, the utmost point is slagging early, for refining furnace creates good conditions;
(2) LF refining utilizes technology and the vacuum deaeration refinings such as the deoxidation of complex deoxidization mode, the refining of high alkalinity refining slag, Narrow Composition Control of the diffusive deoxidation of carbon dust+silicon carbide and feeding aluminum steel strong deoxidation phase, by formulate reasonable Argon stir formulate, the measures such as enough vacuum outgas time, soft blow time that guarantee have guaranteed molten steel cleanness, ingredient stability.
(3) continuous casting is by adopting " three permanent operations ", full guard Prepared by Low Superheat Pouring; mold liquid level is controlled automatically; end induction stirring; dynamically weak cold water distribution; multiple spot continuous straightening, enters burial pit slow cooling, adds a cover the 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 birth high (T.O≤15 * 10 of 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), meets petroleum casing pipe web member and guarantees high-grade flaw detection requirement with steel forgings.
Embodiment
Below by embodiment, the present invention is described in detail, but protection scope of the present invention is not limited to following embodiment.
A kind of petroleum casing pipe web member steel provided by the invention, its chemical composition 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 inevitable impurity.
As a kind of preferred implementation of the present invention, described petroleum casing pipe web member steel, its chemical composition 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 inevitable impurity.More preferably, this petroleum casing pipe web member by the chemical composition of steel according to mass percent is: C:0.29%～0.30%, Si:0.25%～0.28%, Mn:0.51%～0.54%, P:0.008%-0.012%, S:0.003%-0.006%, Cr:0.96%～0.97%, Mo:0.190%～0.200%, Al
t: 0.024%～0.030%, N:50 * 10
-4%～58 * 10
-4%, T.O:12 * 10
-4%～14 * 10
-4%, surplus is Fe and inevitable impurity.
The present invention also provides a kind of petroleum casing pipe web member continuous cast round billets, and with steel, the form with continuous cast round billets exists above-mentioned petroleum casing pipe web member, for the manufacture of petroleum casing pipe web member.
The preparation method of continuous cast round billets for petroleum casing pipe web member provided by the invention, comprises 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;
Following per-cent is not as having specified otherwise to be mass percent.
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 a furnace door oxygen lance oxygen decarburization is auxiliary; Combine with oxygen blast, winding-up carbon dust or other carbon containing pulvis making foamed slags; With addition of slag material as lime slag making dephosphorization; Eccentric bottom tapping, stays steel remaining slag operation; In tapping process, argon bottom-blowing stirs;
Preferably, in burden structure, the mass percent of molten iron accounts for 55%～75%;
Preferably, when winding-up carbon dust or other carbon containing pulvis making foamed slags, the per-cent that mixed carbon comtent accounts for furnace charge gross weight is 1.00%～4.00%, specifically depends on burden structure and charge composition;
Preferably, furnace charge per ton is with addition of 35kg～50kg lime slag making dephosphorization, and molten clear carbon >=0.60%, such as 0.6～1.5%, preferably 0.8～1.2%, more preferably 0.9～1.1%, melt clear phosphorus≤0.025%, simultaneous oxidation decarburization balances the boiling, remove part H and N in steel, control just furnace smelting endpoint C:0.12%～0.20%, P≤0.015%, tapping temperature is 1620 ℃～1660 ℃;
Preferably, described electric furnace is basic electric arc furnace;
At described electric furnace, just refine in operation, described electric furnace has just refined and has carried out in slag free tapping process, tapping process flows along steel, according to actual endpoint carbon content, in ladle, add carbon dust in advance, then the mixing slag material that adds fritting low melting point slag supplying agent and lime to form, wherein, in described mixing slag material, fritting low melting point slag supplying agent is preferably with 1:1 and mixes by weight with lime, and in ladle, the add-on of described mixing slag material is 10kg/t steel～15kg/t steel, preferably, described fritting low melting point slag supplying agent comprises following component, and the mass percent of each component is CaO:40wt%～60wt%, SiO
2: 4wt%～20wt%, Al
2o
3: 15wt%～35wt%, MgO:5wt%～15wt%, add after described mixing slag material, then add alloy and contain aluminium deoxidizer, wherein, described alloy is one or more in silicomanganese, ferrochrome and molybdenum-iron, but the invention is not restricted to this, and concrete alloy adds kind and add-on to determine according to the composition of steel, the described add-on containing aluminium deoxidizer is 1.5kg/t steel～2.0kg/t steel, in slag free tapping process, carry out Argon stirring, it is 1.40MPa～0.80Mpa that tapping early stage, mid-term are controlled argon pressure, it is 0.60MPa～0.20Mpa that later stage is controlled argon pressure, after tapping, goes to before refining station to molten steel, controls argon flow amount for making top of the slag fine motion.
LF refining procedure: refining furnace adopts LF stove, to furnaceman LF position molten steel temperature, be controlled at 1500～1550 ℃, be preferably 1530～1550 ℃, molten steel at refining furnace through operations such as power transmission slag, residue adjustment, line feeding, stirrings, complete deoxidation, desulfurization, removal is mingled with, and adjusting component is controlled the treating processess such as temperature.Adopt carbon dust and silicon carbide diffusive deoxidation, and the complex deoxidization mode deoxidation that feeds the strong deoxidation phase of aluminum steel before analyzing a sample, close on before tapping, feeding silicon-calcium wire is done rotten processing and deep deoxidation to inclusion, wherein, the weight ratio of described carbon dust and silicon carbide is 1:1～5:1, and consumption is 1kg/t steel～2kg/t steel, described aluminum steel consumption is 0.8kg/t steel～1.0kg/t steel, and described 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 described LF refining procedure, LF refining white slag hold-time>=20min, preferably the hold-time is 25～35min, controls finishing slag main component mass percent: CaO:45%～55%, SiO
2: 10%～15%, Al
2o
3: 15%～25%, FeO+MnO≤1.0%, MgO:6%～10%.
Preferably, in described 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%.
After LF stove tapping, also to take off slag operation before 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 VD stove, mainly completes the de-H of molten steel, and further promotes inclusion floating, cleaning molten steel.Ladle is to furnaceman VD position, and thermometric, vacuumizes and carry out Fruit storage, in the following hold-time of vacuum tightness 67Pa, is 15min～20min, H≤2.0 * 10 after vacuum-treat
-4wt%;
Molten steel is after atmospheric pressure state is got back in vacuum refinement, and the treatment stage of entering soft blow, controlling 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, 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, adopt the large bag long nozzle of argon blowing seal, the built-in mouth of a river of tundish and argon blowing seal submerged nozzle, ladle and tundish all to add a cover the full guard Prepared by Low Superheat Pouring of insulation, tundish molten steel face employing low-carbon (LC) high alkalinity insulating covering agent and carbonization rice husk double-layer heat insulation, mold liquid level is controlled automatically, end induction stirring, dynamically weak cold water distribution, multiple spot continuous straightening technology;
Preferably, in described continuous casting working procedure, normal cast tundish molten steel liquid level 850mm～900mm, end electricity stirs mixing parametric: 400A/18.0HZ, 15 ℃～25 ℃ of molten steel cast superheating temperature, cooling each section of water yield partition ratio of continuous casting 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 withdrawal straightening machine of embedded five frame, strand straightening temperature >=910 ℃, such as 910～950 ℃, preferably strand straightening temperature is 915～925 ℃, when specifications section is Ф 350mm, pulling rate is controlled at 0.35-0.42 m/min.
Strand slow cooling operation: continuous cast round billets is cooling through secondary cooling zone, rectify and put, transport rod road and be transferred to after cold bed, proceeds in time burial pit slow cooling, and adds a cover insulation, slow cooling time >=36h, preferably the slow cooling time is 40～48h, hangs out temperature≤250 ℃, is preferably 200～150 ℃.
Check, finishing procedure: check the surface quality of continuous cast round billets and to the internal soundness analysis of testing, and finishing grinding process is carried out in continuous cast round billets surface and end.
Be below to adopt different technical parameters to prepare the specific embodiment of continuous cast round billets for petroleum casing pipe web member of the present invention, totally four embodiment, are numbered 1#, 2#, 3#, 4# by continuous casting heat.
1, electric arc furnace just refines in operation, and the major control processing parameter of four embodiment is in Table 1,2.
The first refining process of table 1 electric arc furnace main technologic parameters
Table 2 electric arc furnace has just refined the main technologic parameters of rear tapping
2, LF refining procedure, major control processing parameter and the finishing slag main component of four embodiment are listed in respectively table 3 and table 4
Table 3LF refining major control processing parameter
Table 4LF refining finishing slag main component (mass percent, %)
| Numbering | CaO | SiO 2 | Al 2O 3 | MgO | FeO | MnO |
| 1# | 53.81 | 10.83 | 20.82 | 8.20 | 0.30 | 0.01 |
| 2# | 52.26 | 12.21 | 21.31 | 7.50 | 0.22 | 0.01 |
| 3# | 53.50 | 11.98 | 19.70 | 6.82 | 0.25 | 0.01 |
| 4# | 52.45 | 13.20 | 19.95 | 7.67 | 0.31 | 0.01 |
3, in VD vacuum outgas operation, the major control processing parameter of four embodiment is listed in table 5, wherein, before ladle enters VD stove, removes the refining slag of 50wt%.
Processing parameter is controlled in the vacuum refinement of table 5VD stove
4, in continuous casting working procedure, four embodiment all adopt full arc shape three machine three stream sides/circle base alloy steel continuous casting machine continuous castings, arc radius is R12m, circle base specification is Ф 350mm, normal cast tundish molten steel liquid level 850mm～900mm, mold liquid level is controlled automatically, end stirring parameter: 400A/18.0HZ, 15 ℃～25 ℃ of molten steel cast superheating temperature, the weak cold water distribution of dynamic gas one fog cooling, cooling each section of 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%; Adopt 4 continuous casting aligning withdrawal straightening machines of embedded six frame, strand straightening temperature reaches 920 ℃, and other control processing parameter in Table 6.
Table 6 continuous casting is controlled processing parameter
5, strand slow cooling operation
Continuous cast round billets is cooling through secondary cooling zone, rectify and put, transport rod road and be transferred to after cold bed, proceeds in time burial pit slow cooling, and adds a cover insulation, and slow cooling time 48h, hangs out 200 ℃～150 ℃ of temperature.
Below the chemical composition of continuous cast round billets for the petroleum casing pipe web member of four embodiment acquisitions, in Table 7; And four embodiment Ф 350mm continuous cast round billets steel low power, the examination of nonmetallic inclusion results of producing, in Table 8, table 9.
Composition in table 7 steel of the present invention (mass percent, %)
By table 7, can find out that by preparation method of the present invention, producing petroleum casing pipe web member stablizes by chemical Composition Control in 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)
By table 8 and table 9, can be found out: preparation method of the present invention produces petroleum casing pipe web member and has dense structure, even with continuous cast round billets, and cleanliness factor is compared with high.
Claims (10)
1. a petroleum casing pipe web member steel, is characterized in that, this petroleum casing pipe web member by the chemical composition of steel according to mass percent is:
C:0.29%～0.30%, Si:0.25%～0.28%, Mn:0.51%～0.54%, P:0.008%-0.012%, S:0.003%-0.006%, Cr:0.96%～0.97%, Mo:0.190%～0.200%, Al
t: 0.024%～0.030%, N:50 * 10
-4%～58 * 10
-4%, T.O:12 * 10
-4%～14 * 10
-4%, surplus is Fe and inevitable impurity.
2. petroleum casing pipe web member steel according to claim 1, is characterized in that, with steel, the form with continuous cast round billets exists this petroleum casing pipe web member, for the manufacture of petroleum casing pipe web member.
3. a manufacture method for continuous cast round billets for petroleum casing pipe web member, comprises 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,
Described petroleum casing pipe web member continuous cast round billets is round base claimed in claim 2;
At described electric furnace, just refine in operation, in burden structure, the mass percent of molten iron accounts for 50%～75%; Described electric furnace has just refined in the process of carrying out slag free tapping, according to actual endpoint carbon content, adds carbon dust in advance in ladle, the mixing slag material that then adds fritting low melting point slag supplying agent and lime to form;
In described continuous casting working procedure, carry out " three perseverances " operation of constant temperature, permanent pulling rate, constant level, adopt the built-in mouth of a river+argon blowing seal of the large bag long nozzle+tundish of argon blowing seal submerged nozzle, ladle and tundish all to add a cover the full guard Prepared by Low Superheat Pouring of insulation, tundish molten steel face employing low-carbon (LC) high alkalinity insulating covering agent and carbonization rice husk double-layer heat insulation, mold liquid level is controlled automatically, end induction stirring, dynamically weak cold water distribution, multiple spot continuous straightening technology; Wherein, normal cast tundish molten steel liquid level is 850mm～900mm, it is 400A/18.0HZ that end electricity stirs mixing parametric, molten steel cast superheating temperature is 15 ℃～25 ℃, cooling each section of water yield partition ratio of continuous casting is: cold one section 24% of sufficient roller section 30%, two, two cold two section 19%, two cold three section 15%, two cold four section 12%, specific water is 0.30L/kg～0.35L/kg.
4. manufacture method according to claim 3, it is characterized in that: at described electric furnace, just refine in operation, in described mixing slag material, fritting low melting point slag supplying agent mixes by weight 1:1 with lime, and in ladle, the add-on of described mixing slag material is 10kg/t steel～15kg/t steel; Preferably, at described electric furnace, just refine in operation, described fritting low melting point slag supplying agent comprises following component, and each component is CaO:40wt%～60wt% by mass percentage, SiO
2: 4wt%～20wt%, Al
2o
3: 15wt%～35wt%, MgO:5wt%～15wt%.
5. manufacture method according to claim 3, it is characterized in that: at described electric furnace, just refine in operation, add after described mixing slag material, add again alloy and contain aluminium deoxidizer, wherein, described alloy is at least one in silicomanganese, ferrochrome or molybdenum-iron, and the described add-on containing aluminium deoxidizer is 1.5kg/t steel～2.0kg/t steel; Preferably, at described electric furnace, just refine in the first refining process of electric furnace of operation, 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 ℃; More preferably, at described electric furnace, just refine in operation, in tapping process, carry out Argon stirring, it is 1.40MPa～0.80MPa that tapping early stage, mid-term are controlled argon pressure, it is 0.60MPa～0.20MPa that later stage is controlled argon pressure, after tapping, go to before refining station to molten steel, control argon flow amount for making top of the slag fine motion.
6. manufacture method according to claim 3, it is characterized in that: in described LF refining procedure, refining furnace adopts LF stove, adopt the complex deoxidization mode deoxidation of carbon dust and silicon carbide diffusive deoxidation and the strong deoxidation phase of feeding aluminum steel, before tapping, feeding silicon-calcium wire is done rotten processing and deep deoxidation to inclusion; Preferably, the weight ratio of described carbon dust and silicon carbide is 1:1～5:1, and consumption is 1kg/t steel～2kg/t steel, and described aluminum steel consumption is 0.8kg/t steel～1.0kg/t steel, and described silicon-calcium wire consumption is 0.010kg/t steel-0.015kg/t steel.
7. manufacture method according to claim 3, is characterized in that: in described LF refining procedure, LF refining white slag hold-time>=20min, controls finishing slag main component mass percent: CaO:45%～55%, SiO
2: 10%～15%, Al
2o
3: 15%～25%, FeO+MnO≤1.0%, MgO:6%～10%; Preferably, in described 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%.
8. manufacture method according to claim 3, is characterized in that: after described LF refining procedure, be after the tapping of LF stove and enter described VD vacuum outgas operation before the operation of skimming, take off the 30%-60% that the quantity of slag accounts for total slag weight.
9. manufacture method according to claim 3, is characterized in that: in described VD vacuum outgas operation, in the following hold-time of vacuum tightness 67Pa, be 15min～20min, and H≤2.0 * 10 after vacuum-treat
-4wt%, molten steel is after atmospheric pressure state is got back in vacuum refinement, and controlling 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, soft blow state is top of the slag fine motion, and molten steel is not exposed; Preferably, in described continuous casting working procedure, adopt 4 continuous casting aligning withdrawal straightening machines of embedded 6 frame, strand straightening temperature>=910 ℃, when specifications section is Ф 350mm, pulling rate is controlled at 0.35-0.42m/min.
10. manufacture method according to claim 3, is characterized in that: in described strand slow cooling operation, continuous cast round billets is cooling through secondary cooling zone, rectify and put, transport rod road and be transferred to after cold bed, proceed in time burial pit slow cooling, and adding a cover insulation, slow cooling time >=36h, hangs out temperature≤250 ℃.
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| CN103572165B (en) | 2015-09-23 |
| CN102660711B (en) | 2014-03-26 |
| CN102660711A (en) | 2012-09-12 |
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