CN103572165B - Petroleum casing pipe web member steel and manufacture method thereof - Google Patents
Petroleum casing pipe web member steel and manufacture method thereof Download PDFInfo
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Abstract
The invention discloses a kind of petroleum casing pipe web member steel and manufacture method thereof that belong to metallurgical technology field.The chemical composition of this petroleum casing pipe web member steel is C:0.29% ~ 0.30% according to mass percent, 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.Its manufacture method comprises following production process: electric furnace just refines operation → LF refining procedure → VD vacuum outgas operation → continuous casting working procedure → strand slow cooling operation → inspection, finishing procedure.The cleanliness factor of the petroleum casing pipe web member continuous cast round billets obtained by the method, dense structure's property, homogeneity are all improved a lot, and meet the requirement of petroleum casing pipe web member steel.
Description
The divisional application that the application is the applying date is on 05 23rd, 2012, application number is 201210160645.2, denomination of invention is the patent application of " petroleum casing pipe web member steel and manufacture method thereof ".
Technical field
The invention belongs to metallurgical technology field, relate to a kind of petroleum casing pipe web member steel and manufacture method thereof.
Background technology
Oil work has the vital role that can not be substituted as " industry blood " in guarantee Economic development, and along with developing rapidly of oil work, oil development is to future developments such as deep-well, ultra deep well, Large travel range.Petroleum casing pipe is a kind of key equipment being widely used in field of petroleum exploitation, and its Main Function is fixing oil well wall.Due to the singularity of 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 is pressed and groundwater pressure with will bearing all kinds of bottom stratum, mud then will be born in the inside of sleeve pipe, interior pressure and water vapour pressure, also will bear the erosion of corrosive liquid and gas sometimes, therefore requires that petroleum casing pipe should have excellent comprehensive mechanical property, namely 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 connected with each other by petroleum casing pipe, and the parts in lower going-into-well are draped from well head to the tubing string that a few km is dark.Each casing joints hangs the weight of tubing string below must supporting, also will bear drawing under working conditions, press, turn round, the comprehensive action of the various load such as curved, and therefore, high strength is one of most important performance requriements; Meanwhile, drilling rod and sleeve pipe radial direction, axial rub make drilling-rod external wall and internal surface of sleeve pipe heavy wear, and the multiple connecting portion being born in drilling rod and sleeve pipe of this wearing and tearing, therefore, requires again stronger wear resistance; Ore deposit, oil well ground is complicated, requires that erosion resistance is strong.In a word, petroleum casing pipe web member steel requires that the intensity of steel is high, and steel is even, and erosion resistance is strong, and wear resistance is good.
The modified structural alloy steel of middle carbon Cr-Mo system, has excellent 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 the specification of quality of petroleum casing pipe web member steel is harsh, its forging requires that guarantee meets high-grade flaw detection.The problems such as current, user mainly adopts steel ingot to be used as forging raw material, but to there is lumber recovery low due to steel ingot, dense structure's property, homogeneity of ingredients difference, cause that the quality stability of forging is 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 cost, but all propose high requirement to the cleanliness factor of continuous cast round billets molten steel, the compactness of tissue, homogeneity.
Summary of the invention
The present invention is directed to the deficiencies in the prior art, provide a kind of petroleum casing pipe web member steel, this petroleum casing pipe web member steel cleanness is high, stable components;
The present invention also provides a kind of petroleum casing pipe web member continuous cast round billets, and above-mentioned petroleum casing pipe web member steel exists with the form of continuous cast round billets, 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 a kind of preparation method of petroleum casing pipe web member continuous cast round billets.The cleanliness factor of the petroleum casing pipe web member continuous cast round billets obtained by the method, dense structure's property, homogeneity are all improved a lot, and meet the requirement of petroleum casing pipe web member steel.
The chemical composition of above-mentioned petroleum casing pipe web member 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.
Be described in detail to the Design Mechanism of main component of the present invention below:
C: the intensity and the hardness that improve steel, reduction is moulded, toughness.Carbon content, lower than 0.28%, not easily reaches strong, hardness requirement, increases alloy dosage; Higher than 0.33% be difficult to meet mould, toughness reguirements, and easily cause component segregation of continuous casting slab and heating time overheated.
Si: the intensity, the hardening capacity that improve 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: the hardening capacity significantly improving 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 most high-content is 0.60%.
P, S: the cutting ability improving 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 is more than 0.025%, should reduce its content as far as possible.
Cr: the intensity and the hardening capacity that significantly improve steel, improves wear resistance and resistance to corrosion simultaneously, but too high levels, easily increase steel belt roof bolt fragility; According to the requirement of steel grade use properties, design chromium content is 0.90% ~ 1.10%.
Mo: significantly improve the hardening capacity of steel, impelling strength and corrosion resistance nature, improves temper resistance.Content is not obvious 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 can not play useful effect lower than 0.020%; Content higher than 0.050% time, easily cause secondary oxidation, reduce Molten Steel Flow, worsen the quality of steel.
Cu: as the harmful residual element in steel, content higher than 0.25% time, reduce the moulding of steel, toughness, 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 %, by significantly reducing 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: the intensity that can improve steel, be combined with Al and generate AlN crystal grain thinning, content is higher than 40 × 10
-4useful effect can be played during %, but content is higher than 70 × 10
-4to steel inclusion be increased during %, and significantly worsen the toughness of steel, make steel easily produce blue shortness.
Preferably, the chemical composition of described petroleum casing pipe web member 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.
This petroleum casing pipe web member steel exists with the form of continuous cast round billets, for the manufacture of petroleum casing pipe web member.
The manufacture method of above-mentioned petroleum casing pipe web member continuous cast round billets 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 → inspection, finishing procedure; Wherein,
Just refine in operation at described electric furnace, 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, adds carbon dust in advance according to actual endpoint carbon content in ladle, then adds the mixing slag material of fritting low melting point slag supplying agent and lime composition.
Just refine in operation at described electric furnace, after adding 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 does Metamorphism treatment and deep deoxidation to inclusion.
After described LF refining procedure, namely LF stove is tapped rear and is carried out operation of skimming before entering described VD vacuum outgas operation, takes off the 30%-60% that the quantity of slag accounts for total slag weight.
In described VD vacuum outgas operation, be 15min ~ 20min in below the vacuum tightness 67Pa hold-time, H≤2.0 × 10 after vacuum-treat
-4wt%, molten steel is got back to after atmospheric pressure state through vacuum refinement, and controlling argon bottom-blowing flow is 120L/min ~ 260L/min, and pressure is 0.20MPa ~ 0.40MPa, and keep the soft blow time to be 15min ~ 30min, 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 is permanent " operation of constant temperature, permanent pulling rate, constant level; adopt the full guard Prepared by Low Superheat Pouring that the built-in mouth of a river of argon blowing seal large bag long nozzle+tundish+argon blowing seal submerged nozzle, ladle and tundish all adds a cover insulation, tundish molten steel face adopts low-carbon (LC) high alkalinity insulating covering agent and carbonization rice husk double-layer heat insulation; mold liquid level controls automatically; end induction stirring; dynamic weak cold water distribution, multiple spot continuous straightening technology.
In described strand slow cooling operation, continuous cast round billets through secondary cooling zone cooling, rectify and put, transport after rod road is transferred to cold bed, proceed to burial pit slow cooling in time, and add a cover insulation, slow cooling time >=36h, hang out temperature≤250 DEG C.
Beneficial effect of the present invention is as follows:
(1) electric furnace adopts and add appropriate carbon dust deoxidation in advance after molten iron, stove at high proportion, add the mixing slag material of fritting low melting point slag material and lime composition, carry out slag modification, add the technique means such as aluminium matter reductor strengthening pre-deoxidation, reduce dissolved oxygen content in steel as early as possible, pole is slagging early, for refining furnace creates good conditions;
(2) LF refining utilizes technology and the vacuum deaeration refining such as the deoxidation of complex deoxidization mode, the refining of high alkalinity refining slag, Narrow Composition Control of carbon dust+silicon carbide diffusive deoxidation and the strong deoxidation phase of feeding aluminum steel, stirs formulation by formulating reasonable Argon, ensures that the measures such as enough vacuum outgas time, soft blow time ensure that molten steel cleanness, ingredient stability.
(3) continuous casting is by adopting " three permanent operations ", full guard Prepared by Low Superheat Pouring; mold liquid level controls automatically; end induction stirring; dynamic weak cold water distribution; multiple spot continuous straightening, enters burial pit slow cooling, adds a cover the technology such as insulation, ensure that continuous cast round billets surface quality, cleanliness factor, homogeneity of structure and compactness; reduce structural stress and thermal stresses, avoid the generation of internal fissure.
(4) above-mentioned preparation method is adopted can to 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 steel forgings and ensures high-grade flaw detection requirement.
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, the chemical composition of this petroleum casing pipe web member 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 namely above-mentioned petroleum casing pipe web member steel exists with the form of continuous cast round billets, for the manufacture of petroleum casing pipe web member.
The preparation method of petroleum casing pipe web member continuous cast round billets 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 → inspection, finishing procedure;
Following per-cent is then mass percent as not having specified otherwise.
Electric furnace just refines operation: the burden structure adopting steel scrap and molten iron, and 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 melting down carbon >=0.60%, such as 0.6 ~ 1.5%, preferably 0.8 ~ 1.2%, more preferably 0.9 ~ 1.1%, melting down 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 DEG C ~ 1660 DEG C;
Preferably, described electric furnace is basic electric arc furnace;
Just refine in operation at described electric furnace, described electric furnace has just refined and has carried out in slag free tapping process, tapping process is along steel stream, in ladle, carbon dust is added in advance according to actual endpoint carbon content, then the mixing slag material of fritting low melting point slag supplying agent and lime composition is added, wherein, in described mixing slag material, fritting low melting point slag supplying agent and lime are by weight preferably mixing with 1:1, and the add-on of described mixing slag material is 10kg/t steel ~ 15kg/t steel in ladle, 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%, after adding described mixing slag material, then add alloy and containing aluminium deoxidizer, wherein, described alloy is one or more in silicomanganese, ferrochrome and molybdenum-iron, but the present invention is not limited thereto, and concrete alloy adds kind and add-on is determined according to the composition of steel, the described add-on containing aluminium deoxidizer is 1.5kg/t steel ~ 2.0kg/t steel, Argon stirring is carried out in slag free tapping process, tapping early stage, mid-term, to control argon pressure be 1.40MPa ~ 0.80Mpa, it is 0.60MPa ~ 0.20Mpa that later stage controls argon pressure, before going to refining station, controls argon flow amount for making top of the slag fine motion after tapping to molten steel.
LF refining procedure: refining furnace adopts LF stove, control at 1500 ~ 1550 DEG C to furnaceman LF position molten steel temperature, be preferably 1530 ~ 1550 DEG C, molten steel at refining furnace through operations such as power transmission slag, residue adjustment, line feeding, stirrings, complete deoxidation, desulfurization, removal is mingled with, adjusting component, the treating processess such as control temperature.Adopt carbon dust and silicon carbide diffusive deoxidation, and before analysis sample, feed the complex deoxidization mode deoxidation of the strong deoxidation phase of aluminum steel, before closing on tapping, feeding silicon-calcium wire does Metamorphism treatment 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 controls at 1600 ~ 1650 DEG C, is preferably 1600 ~ 1620 DEG C.
Preferably, in described LF refining procedure, LF refining white slag hold-time>=20min, the preferred 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 the tapping of LF stove, also to carry out before entering VD vacuum outgas operation taking off slag 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 molten steel and takes off H, and promote inclusion floating further, cleaning molten steel.After ladle to furnaceman VD position, thermometric, vacuumizes and carries out Fruit storage, is 15min ~ 20min in below the vacuum tightness 67Pa hold-time, H≤2.0 × 10 after vacuum-treat
-4wt%;
Molten steel is got back to after atmospheric pressure state through 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, keeps the soft blow time to be 15min ~ 30min, wherein, soft blow state is top of the slag fine motion, and molten steel is not exposed.
Continuous casting working procedure: " three the is permanent " operation carrying out constant temperature, permanent pulling rate, constant level, adopt the full guard Prepared by Low Superheat Pouring that argon blowing seal large bag long nozzle, the built-in mouth of a river of tundish and argon blowing seal submerged nozzle, ladle and tundish all add a cover insulation, tundish molten steel face adopts low-carbon (LC) high alkalinity insulating covering agent and carbonization rice husk double-layer heat insulation, mold liquid level controls automatically, end induction stirring, dynamic 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, molten steel cast superheating temperature 15 DEG C ~ 25 DEG C, continuous casting cools each section of water operation ratio: 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 DEG C, such as 910 ~ 950 DEG C, preferred strand straightening temperature is 915 ~ 925 DEG C, and when specifications section is Ф 350mm, casting speed control is at 0.35-0.42 m/min.
Strand slow cooling operation: continuous cast round billets through secondary cooling zone cooling, rectify and put, transport after rod road is transferred to cold bed, proceed to burial pit slow cooling in time, and add a cover insulation, slow cooling time >=36h, the preferred slow cooling time is 40 ~ 48h, hangs out temperature≤250 DEG C, is preferably 200 ~ 150 DEG C.
Inspection, finishing procedure: check the surface quality of continuous cast round billets and internal soundness is tested analysiss, and finishing grinding process is carried out in surperficial and end to continuous cast round billets.
Be below the specific embodiment adopting different technical parameters to prepare petroleum casing pipe web member continuous cast round billets of the present invention, totally four embodiments, 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 embodiments is in table 1,2.
Table 1 electric arc furnace first refining process 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 embodiments list in table 3 and table 4 respectively
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 embodiments lists in table 5, wherein, before ladle enters VD stove, removes the refining slag of 50wt%.
Table 5VD stove vacuum refinement Controlling Technology parameter
4, in continuous casting working procedure, four embodiments all adopt full arc shape three machine three side of stream/circle base alloy steel continuous casting machine continuous casting, arc radius is R12m, circle base specification is Ф 350mm, normal cast tundish molten steel liquid level 850mm ~ 900mm, mold liquid level controls automatically, end stirring parameter: 400A/18.0HZ, molten steel cast superheating temperature 15 DEG C ~ 25 DEG C, the weak cold water distribution of dynamic gas one fog cooling, cooling each section of water operation 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 embedded six frame 4 continuous casting aligning withdrawal straightening machines, strand straightening temperature reaches 920 DEG C, and other Controlling Technology parameters are in table 6.
Table 6 continuous casting Controlling Technology parameter
5, strand slow cooling operation
Continuous cast round billets through secondary cooling zone cooling, rectify and put, transport after rod road is transferred to cold bed, proceed to burial pit slow cooling in time, and add a cover insulation, slow cooling time 48h, hang out temperature 200 DEG C ~ 150 DEG C.
Below the chemical composition of the petroleum casing pipe web member continuous cast round billets that four embodiments obtain, in table 7; And Ф 350mm continuous cast round billets steel low power, examination of nonmetallic inclusion result that four embodiments are produced, in table 8, table 9.
Composition (mass percent, %) in table 7 steel of the present invention
By table 7, can find out that producing chemical Composition Control in petroleum casing pipe web member continuous cast round billets steel by preparation method of the present invention stablizes, 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 (level) of the present invention
Table 9 continuous cast round billets non-metallic inclusion (level) of the present invention
As can be seen from table 8 and table 9: preparation method of the present invention produces that petroleum casing pipe web member continuous cast round billets has dense structure, evenly, cleanliness factor is high comparatively.
Claims (2)
1. a manufacture method for petroleum casing pipe web member continuous cast round billets, comprises following production process: electric furnace just refines operation → LF refining procedure → VD vacuum outgas operation → continuous casting working procedure → strand slow cooling operation → inspection, finishing procedure, it is characterized in that,
The chemical composition of described petroleum casing pipe web member continuous cast round billets 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;
Just refine in operation at described electric furnace, in burden structure, the mass percent of molten iron accounts for 50% ~ 75%; In the first refining process of electric furnace, mixed carbon comtent is 1.00wt% ~ 4.00wt%, melting down carbon>=0.60wt%, melting down phosphorus≤0.025wt%, smelting endpoint C:0.12wt% ~ 0.20wt%, P≤0.015wt%, and tapping temperature is 1620 DEG C ~ 1660 DEG C; Described electric furnace has just refined in the process of carrying out slag free tapping, in ladle, carbon dust is added in advance according to actual endpoint carbon content, then the mixing slag material of fritting low melting point slag supplying agent and lime composition is added, in wherein said mixing slag material, fritting low melting point slag supplying agent mixes by weight 1:1 with lime, and the add-on of described mixing slag material is 10kg/t steel ~ 15kg/t steel in ladle, described fritting low melting point slag supplying agent comprises following component, each component is CaO:40wt% ~ 60wt%, SiO by mass percentage
2: 4wt% ~ 20wt%, Al
2o
3: 15wt% ~ 35wt%, MgO:5wt% ~ 15wt%; After adding 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; Argon stirring is carried out in tapping process, tapping early stage, mid-term, to control argon pressure be 1.40MPa ~ 0.80MPa, it is 0.60MPa ~ 0.20MPa that later stage controls argon pressure, before going to refining station, controls argon flow amount for making top of the slag fine motion after tapping to molten 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 does Metamorphism treatment and deep deoxidation to inclusion; 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; LF refining white slag hold-time>=20min, control 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%;
In described VD vacuum outgas operation, be 15min ~ 20min in below the vacuum tightness 67Pa hold-time, H≤2.0 × 10 after vacuum-treat
-4wt%, molten steel is got back to after atmospheric pressure state through vacuum refinement, and controlling argon bottom-blowing flow is 120L/min ~ 260L/min, and pressure is 0.20MPa ~ 0.40MPa, and keep the soft blow time to be 15min ~ 30min, wherein, soft blow state is top of the slag fine motion, and molten steel is not exposed;
After described LF refining procedure, namely LF stove is tapped rear and is carried out operation of skimming before entering described VD vacuum outgas operation, takes off the 30%-60% that the quantity of slag accounts for total slag weight;
In described continuous casting working procedure, carry out " three is permanent " operation of constant temperature, permanent pulling rate, constant level, adopt the full guard Prepared by Low Superheat Pouring that the built-in mouth of a river of argon blowing seal large bag long nozzle+tundish+argon blowing seal submerged nozzle, ladle and tundish all adds a cover insulation, tundish molten steel face adopts low-carbon (LC) high alkalinity insulating covering agent and carbonization rice husk double-layer heat insulation, mold liquid level controls automatically, end induction stirring, dynamic 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 DEG C ~ 25 DEG C, continuous casting cools each section of water operation ratio: sufficient roller section 30%, two cold a section 24%, two cold two section 19%, two cold three section 15%, two cold four section 12%, and specific water is 0.30L/kg ~ 0.35L/kg; Adopt embedded 6 frame 4 continuous casting aligning withdrawal straightening machines, strand straightening temperature >=910 DEG C, when specifications section is Ф 350mm, casting speed control is at 0.35-0.42m/min;
In described strand slow cooling operation, continuous cast round billets through secondary cooling zone cooling, rectify and put, transport after rod road is transferred to cold bed, proceed to burial pit slow cooling in time, and add a cover insulation, slow cooling time >=36h, hang out temperature≤250 DEG C.
2. manufacture method according to claim 1, is characterized in that: in described LF refining procedure, and 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%.
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| CN102899450B (en) * | 2012-10-12 | 2014-10-22 | 舞阳钢铁有限责任公司 | Method for avoiding separation of fracture test samples |
| CN103320722B (en) * | 2013-07-04 | 2015-09-16 | 莱芜钢铁集团有限公司 | A kind of quenching and tempering type high strength sulfur resisting hydrogen oil tube steel and manufacture method thereof |
| CN103695785B (en) * | 2013-12-11 | 2016-08-17 | 莱芜钢铁集团有限公司 | A kind of cryogenic high pressure conduit coupling steel and the manufacture method of continuous cast round billets thereof |
| CN103898413B (en) * | 2014-03-18 | 2016-01-20 | 莱芜钢铁集团有限公司 | V n micro alloying frotton steel and preparation method thereof |
| TWI560276B (en) * | 2014-06-04 | 2016-12-01 | China Steel Corp | Steel making method |
| CN104259415B (en) * | 2014-10-23 | 2016-08-24 | 山东钢铁股份有限公司 | A kind of continuous cast method of continuous cast round billets |
| CN104789734B (en) * | 2015-04-03 | 2017-10-03 | 山东钢铁股份有限公司 | A kind of smelting process of sulfur bearing steel |
| CN105483322A (en) * | 2015-11-30 | 2016-04-13 | 北大方正集团有限公司 | Production method of hardened steel and hardened steel |
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| CN108296461A (en) * | 2018-01-18 | 2018-07-20 | 新疆八钢铁股份有限公司 | Oil casing pipe steel J55 steel-making continuous casting production methods |
| CN108977624A (en) * | 2018-08-31 | 2018-12-11 | 包头钢铁（集团）有限责任公司 | Refining slag |
| CN109913757B (en) * | 2019-03-22 | 2020-07-03 | 达力普石油专用管有限公司 | Corrosion-resistant and high-extrusion-resistance petroleum casing pipe and preparation method thereof |
| CN110964984B (en) * | 2019-12-30 | 2021-09-24 | 本钢板材股份有限公司 | Steel SAE4160M for middle and large automobile shaft sleeve and production process thereof |
| CN113373379B (en) * | 2021-06-21 | 2022-08-23 | 承德建龙特殊钢有限公司 | Continuous casting billet for petroleum valve body and preparation method thereof |
| CN113337672B (en) * | 2021-06-23 | 2022-07-29 | 承德建龙特殊钢有限公司 | Method for controlling inclusions in refining furnace process of bearing steel |
| CN114717479B (en) * | 2022-04-08 | 2022-12-16 | 承德建龙特殊钢有限公司 | Steel for oil clothing valve body and preparation method thereof |
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| CN102660711A (en) | 2012-09-12 |
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