CN101446180A - Round blank for high-steel level oil bushing and manufacturing process - Google Patents
Round blank for high-steel level oil bushing and manufacturing process Download PDFInfo
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- CN101446180A CN101446180A CNA2008101528669A CN200810152866A CN101446180A CN 101446180 A CN101446180 A CN 101446180A CN A2008101528669 A CNA2008101528669 A CN A2008101528669A CN 200810152866 A CN200810152866 A CN 200810152866A CN 101446180 A CN101446180 A CN 101446180A
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Abstract
The invention relates to a round bland in a new type of steel and a manufacturing process. An oil bushing, in particular P110 high-steel level oil bushing, is used for deep well and environment having complicated layer conditions, and requires higher demand on quality of round tube blank for the oil bushing. At present, there mainly are C-Mn steel serial, Mo-containing steel serial, the C-Mn steel serial are more economical but relatively more inferior in intensity, toughness and metallurgical structure of the steel; the Mo-containing steel serial has good intensity, toughness and high temperature resistance but with cost thereof being increased dramatically. The invention uses a measure that control C content, higher Mn content and adds a particular amount of Cr, which meets the demand of intensity of the steel pipe, and the invention designs new type of steel and the manufacturing process thereof. The main components are (based on weight percent): C=0.28-0.34%, Si=0.20-0.35%, Mn=1.40-1.80%, Cr=0.25-0.34%, P is not more than 0.025%, S is not more than 0.025%, Al=0.01-0.03%, and Fe in equilibrium amount, diameter of the round blank is 150 to 200 mm; the invention employs the procedures of top-bottom re-blowing rotary furnace-LF refining furnace-VD vacuum refining furnace-round blank continuous caster-turn-over cooling bed-checkup-warehousing.
Description
Technical field
The present invention relates to a kind of round base and manufacturing process of new steel grade, relate in particular to high-steel level oil bushing circle base steel grade and smelting, LF refining, VD vacuum refining and continuous casting process.
Technical background
Petroleum casing pipe is high-steel level oil bushing particularly, is mainly used in deep-well and the formation condition complexity occasion to sleeve pipe performance requirement harshness as P110 level petroleum casing pipe.Therefore, require this tubing to have good comprehensive performances, promptly high tensile and bonding strength, excellent anti-squeezing are ruined performance and sealing performance, thereby the circular pipe blank that production P110 level petroleum casing pipe is used has also proposed higher quality requirement.
The high-steel level oil bushing steel of each enterprise's development as the P110 casing steel, mainly contains C-Mn steel series, Cr-Mo steel series, Mn-Mo steel series and Cr-Mn-Mo steel series, and microelement Ti, Nb, B, Cu etc. also are applied in oil well pipe in addition.Comparatively speaking, C-Mn steel series of comparisons economy, cost is low, but the intensity of steel, toughness and metallographic structure relative mistake some; The intensity, toughness and the resistance to elevated temperatures that contain Mo steel series are better, but cost increases substantially.
Following principle is adopted in new steel grade composition design of the present invention, promptly suitably control C content in the 0.28-0.34% scope, adopt higher Mn content such as 1.40-1.80% simultaneously, and add certain Cr content such as 0.25-0.34%, satisfy of the requirement of API5CT standard, and increase the corrosion resistance of steel to a certain extent steel strength; And, do not add the Mo element in the steel in order to save cost.To owing to improve the shortcoming that the heat sensitivity of grain growth that Mn content causes and steel strengthens, take in steel, to add crystal grain thinning elements A 1,, reduce in the 0.01-0.03% scope as the content of Al owing to put forward the adverse effect that Mn brings.This new steel grade has overcome the relatively poor relatively shortcoming of intensity, toughness and metallographic structure of original C-Mn Series Steel; When satisfying intensity, toughness reguirements, compare simultaneously, saved expensive Mo resource, reduced cost with the former Mo of containing steel grade.
For saving the Mo resource, reducing production costs, consider the economy of product development, consider that simultaneously the P110 high-steel level oil bushing should possess the anti-high strength requirement of ruining of squeezing with steel, the present invention utilizes the equipment condition of existing blast furnace ironmaking → top and bottom combined blown converter → LF ladle refining furnace → VD vacuum refining furnace → advanced production lines such as circle (side) billet continuous casting machine, by optimizing technology, having designed high grade of steel is chemical analysis and the manufacturing process of P110 level petroleum casing pipe with the circle base.
Summary of the invention
High-steel level oil bushing of the present invention is mainly realized by following means with the chemical analysis and the manufacturing process of circle base.
High-steel level oil bushing of the present invention circle base, its trade mark is 30Mn2Cr, its main component is (by % weight) C=0.28-0.34%, Si=0.20-0.35%, Mn=1.40-1.80%, Cr=0.25-0.34%, P≤0.025%, S≤0.025%, Al=0.01-0.03%, and the Fe of aequum, circle base diameter 150-200mm.
High-steel level oil bushing of the present invention circle base, the process route of employing top and bottom combined blown converter → LF refining furnace → VD vacuum refining furnace → round billet continuous casting machine → turn over cooling bed → check → warehouse-in; In the converter operation, adopting oxygen to press is that 0.8-0.85MPa, flow are 22800-23200m
3The oxygen supply system of/h, argon bottom-blowing or nitrogen stir, and before the converter smelting, the slag making in mid-term takes off P, the P in the intermediary and later stages stabilizing slag also realizes that molten steel takes off S, takes pushing off the slag tapping control slag thickness 0-50mm down.At the LF refining procedure, use refining slag, make the foaming white slag, white slag refining 15-20 minute, the LF refining procedure is with 30-35 minute, and the temperature that controls to the VD vacuum refining furnace is 1610 ± 5 ℃.In VD vacuum refining operation, under molten steel vacuum≤67Pa, kept 10-15 minute, adopting pressure simultaneously is the Argon stirring of 0.15-0.25MPa, feeds the CaSi silk after the application of vacuum, carries out the soft blow operation then.In the round billet continuous casting operation, wherein secondary cooling water divides three sections, and one section accounts for 30%, two section and accounts for 50%, three section and account for 20%, and specific water 0.92-1.10L/Kg, pulling rate are 1.7m-3.2m/min, and use crystallizer electromagnetic agitation technology.
Described high-steel level oil bushing in the converter operation, is gone into converter molten iron [Si]=0.30-0.85%, [P]=0-0.080%, [S]=0-0.030% with circle base production process route, adds with CaF in ladle in the tapping process
2, CaO is main synthetic slag charge, takes catch carbon practice, makes molten steel [C]=0.10-0.15%, [P]=0-0.012%.At the LF refining procedure, use composition to be CaO=40-48%, Al
2O
3=38-45%, MgO=6-10%, SiO
2=0.5-6%, Fe
2O
3The refining slag of=0.1-2%; Make the molten steel composition be controlled at preferable range C=0.30-0.32%, Si=0.25-0.29%, Mn=1.57-1.63%, Cr=0.27-0.31%, P≤0.020%, S≤0.010%, Al=0.010-0.030%.In VD vacuum refining operation, wherein feeding the CaSi filament length is 130-170m, and carrying out pressure then is the soft blow operation of 0.15-0.20Mpa, and 5-10 minute soft blow time, making molten steel departures hydrogen content is 0-2ppm, is 1565 ± 5 ℃ to continuous casting platform temperature.In the round billet continuous casting operation, tundish adopts MgCa matter coating material and barricade is set, and the degree of superheat of molten steel is controlled in the 20-35 ℃ of scope, and ladle takes to add protective casing to tundish, tundish to crystallizer whole process in the casting process, protects cast; Described crystallizer (M-EMS) electromagnetic agitation technology promptly adopts by 6 coils and forms, and central magnetic field intensity reaches 0.08-0.12T.
Use new steel grade and the manufacture method thereof of production P110 high-steel level oil bushing provided by the invention, overcome the relatively poor relatively shortcoming of intensity, toughness and metallographic structure of original C-Mn Series Steel with circular pipe blank; When satisfying intensity, toughness reguirements, compare simultaneously, saved expensive Mo resource, reduced cost with the former Mo of containing steel grade.Its production method of while, improved the molten steel degree of purity, harmful residual elements (as As, Sn, Ni, Pb, Sb etc.) content is low in the steel, alleviates the harm of the fished pipe temper brittleness that harmful residual elements cause, and has guaranteed the performance of the P110 high-steel level oil bushing that this steel grade circular pipe blank is produced.
This steel grade chemical Composition Control strictness, the supply of material is even by the gross, fluctuation is little; Adopt top bottom compound blowing technology, the oxygen supply of low pressure and mass flow oxygen rifle, blowing is steady, and composition and temperature shoot straight; In bag, add special-purpose synthetic slag during tapping, carry out wash heat, further desulfurization, removal is mingled with; LF, VD refining procedure are furnished with ladle overall process BOTTOM ARGON BLOWING and ladle wire feeding equipment, can effectively remove gas in the steel, reduce inclusion content of steel, improve the molten steel degree of purity; The refining slag of independent development exploitation has been adopted in the refining of LF stove, guarantees that the composition adjustment is even, and inclusion modification is handled, and helps removing; Adopt crystallizer electromagnetic agitation technology, improve slab quality.
Description of drawings
Accompanying drawing 1 is a manufacturing process route schematic diagram of the present invention.In the accompanying drawings, the top and bottom combined blown converter operation comprises the big flow oxygen supply system of low oxygen pressure, and argon bottom-blowing or nitrogen take off S, the tapping of P shelves slag; LF refining furnace operation comprises the use refining slag, makes the foaming white slag, controls to VD vacuum refining furnace temperature; VD vacuum refining furnace operation comprises application of vacuum, and Argon stirs, and feeds silk, soft blow; The round billet continuous casting operation comprise three section two cold, little specific water is weak cold, electromagnetic agitation.
The specific embodiment
Describe in detail below in conjunction with accompanying drawing.As shown in Figure 1, process route of the present invention is for adopting the process route of top and bottom combined blown converter → LF refining furnace → VD vacuum refining furnace → round billet continuous casting machine → turn over cooling bed → check → warehouse-in.
Concrete technical measures comprise:
The one, the preferred and setting of chemical analysis.The new steel grade trade mark of the present invention is the chemical analysis that 30Mn2Cr reaches, and sees Table 1.
Table 1 high-steel level oil bushing circular pipe blank chemical analysis unit: %
| C | Si | Mn | P | S | Cr | Al |
| 0.28—0.34 | 0.20—0.35 | 1.40—1.80 | ≤0.025 | ≤0.025 | 0.25-0.34 | 0.01-0.03 |
Require (Pb+Sn+As+Sb+Bi)≤250ppm in the steel simultaneously, single-element content≤100ppm.
The 2nd, production process route.
The manufacturing process of new steel grade of the present invention comprises top and bottom combined blown converter → LF refining furnace → VD vacuum refining furnace → Φ 150mm-200mm round billet continuous casting machine → turn over cooling bed → check → warehouse-in.
1, converter smelting is gone into the raw material of converter smelting, take the fine fodder principle, promptly goes into stove molten iron [Si]=0.30-0.85%, [P]=0-0.080%, [S]=0-0.030%.Adopt top and bottom combined blown converter to realize the first refining of molten steel.Top and bottom combined blown converter is compared with traditional top-blown converter, has strengthened in the smelting process the stirring in molten bath, promote the carrying out of various metallurgical reactions and temperature, composition evenly.Top and bottom combined blown converter adopts low oxygen pressure, big flow oxygen rifle oxygen supply, and it is that 0.8-0.85MPa, flow are 22800-23200m that oxygen is pressed
3/ h; Argon bottom-blowing or nitrogen stir; Before the converter smelting, the mid-term slag making strengthens and takes off P, the P in the intermediary and later stages stabilizing slag also realizes that molten steel takes off S; Take the pushing off the slag tapping in the converter tapping process, control is quantity of slag 0-50mm down, prevents rephosphorization; (Main Ingredients and Appearance is CaF to add synthetic slag charge in the tapping process in ladle
2, CaO) carry out wash heat, carry out the upgrading of ladle top slag simultaneously, further desulfurization goes to be mingled with; Take catch carbon practice, converter tapping target call molten steel [C]=0.10-0.15%, [P]=0-0.012%.
2, LF refining: because this steel grade requires composition uniform and stable, fluctuation range is little between each heat, strict to inclusion content of steel, so the LF refining procedure is controlled around adjustment and evening chemical composition, steel inclusion sex change and aspects such as removal, adjustment temperature.The control range of molten steel chemical composition is in the LF refining process: C=0.28-0.34%, Si=0.20-0.35%, Mn=1.40-1.80%, Cr=0.25-0.34%, P≤0.025%, S≤0.025%, Al=0.01-0.03%.
Its preferable range is: C=0.30-0.32%, Si=0.25-0.29%, Mn=1.57-1.63%, Cr=0.27-0.31%, P≤0.020%, S≤0.010%, Al=0.010-0.030%.The temperature of arriving at a station that controls to the VD refining is 1610 ± 5 ℃.
(special-purpose refining slag is meant and applies for patent of invention, and application number 200610011709.7, composition are CaO=40-48%, Al to develop a kind of special-purpose refining slag at the characteristics of this kind
2O
3=38-45%, MgO=6-10%, SiO
2=0.5-6%, Fe
2O
3=0.1-2%); Use special-purpose refining slag in the refining process, improve slagging speed and refining effect, make the foaming white slag, stablize refining operation, white slag refining time 15-20 minute, the LF refining treatment time was at 30-35 minute.
3, VD vacuum refining operation, molten steel application of vacuum required at vacuum≤67Pa 10-15 of following retention time minute, and adopting pressure simultaneously is the weak Argon stirring of 0.15-0.25MPa, avoids turning over greatly, effectively removes gas in the steel, reduces inclusion content of steel; After application of vacuum finishes, feed CaSi silk 130-170m, improve fluidity molten steel and field trash is carried out degenerative treatments, guarantee carrying out smoothly of cast; Feed after silk finishes, carrying out pressure is the soft blow operation of 0.15-0.20MPa, guarantees 5-10 minute enough soft blow time, makes in the steel chemical composition and temperature even, and field trash is further removed, and guarantees that the molten steel hydrogen content that sets off is 0-2ppm; Temperature control, requiring the continuous casting temperature of arriving at a station is 1565 ± 5 ℃.
4, continuous casting working procedure, Φ 150mm-Φ 200mm round billet continuous casting machine, for guaranteeing carrying out smoothly of slab quality and continuous casting, emphasis control the following aspects:
(1) ladle takes whole process to add protective casing protection cast to tundish, tundish to crystallizer in the casting process, prevents secondary oxidation of steel, guarantees the degree of purity of molten steel;
(2) control rationally that the casting machine secondary cooling water distributes and the secondary cooling water specific water, guarantee two cold but evenly; Being distributed as one section and accounting for 30%, two section and account for 50%, three section and account for 20% of water, specific water 0.92-1.10L/Kg is to reach the generation that reduces even stop the strand underbead crack;
(3) molten steel overheat is controlled in the 20-35 ℃ of scope, stable pulling rate is 1.7-3.2m/min, adopts the pulling rate of the round base employing of pulling rate, the Φ 200mm 1.7-2.0m/min of 1.9-2.3m/min for the round base of pulling rate, Φ 180mm of the round base employing of pulling rate, the Φ 160mm 2.4-2.8m/min of Φ 150mm circle base employing 2.8-3.2m/min according to the preferable range of different size pulling rate;
(4) tundish is provided with barricade, removes to promote inclusion floating.Tundish coating material adopts the MgCa material, and what alleviate that the tundish refractory corrosion brings is mingled with pollution to molten steel;
(5) use the crystallizer electromagnetic agitation, guarantee strand crystalline structure densification, even, reduce strand column crystal rate, avoid defectives such as strand crackle, shrinkage cavity.Described crystallizer (M-EMS) electromagnetic agitation technology promptly adopts by 6 coils and forms, and central magnetic field intensity reaches 0.08-0.12T.
The present invention adopts CONCAST six machines six stream full arc type round billet continuous casting machines, are furnished with crystallizer and solidification end two-stage electromagnetic stirring system, two cold automatic distribution water systems, mold liquid level detects and control system automatically, add the sleeve pipe oxidation-less casting, guarantee continuous casting billet structure evenly, surface and inherent quality optimum.
Enumerate four embodiment below:
Embodiment one:
(1) goes into the stove molten iron, [Si]=0.45%, [P]=0.070%, [S]=0.028%.
(2) converter smelting is smelted steel grade 30Mn2Cr, takes catch carbon practice, tapping [C]=0.11%, [P]=0.009%; Employing pushing off the slag tapping, following slag thickness 40mm.
(3) LF refining, Composition Control [C]=0.30%, [Si]=0.26%, [Mn]=1.59%, [Cr]=0.29%, [Al]=0.0245%, [S]=0.005%; White slag refining time 16 minutes; The refining out-station temperature is controlled to be 1612 ℃, 31 minutes LF refining treatment time.
(4) VD refining procedure kept 10 minutes during molten steel application of vacuum vacuum 60Pa, and 0.20MPa pressure Argon stirs simultaneously; The departures hydrogen content is 1.2ppm; Feed CaSi silk 150m, improve fluidity molten steel and inclusion modification and handle; Feed after the CaSi silk finishes, carry out pressure and be the soft blow operation 9 minutes of 0.17MPa; Adjust arrive at a station 1566 ℃ of temperature of continuous casting.
(5) continuous casting working procedure, casting blank section Φ 150mm.Continuous casting is big to wrap tundish, tundish takes whole process to add protective casing protection cast to crystallizer; The casting machine secondary cooling water adopts three sections distributions, specific water 1.10L/Kg; . 25 ℃ of the degrees of superheat of molten steel, pulling rate 3.0m/min.
Embodiment two:
(1) goes into the stove molten iron: [Si]=0.50%, [P]=0.075%, [S]=0.025%.
(2) converter smelting.Smelt steel grade 30Mn2Cr, take catch carbon practice, tapping [C]=0.12%, [P]=0.010%; Employing pushing off the slag tapping, following slag thickness 45mm.
(3) LF refining.Composition Control [C]=0.31%, [Si]=0.27%, [Mn]=1.58%, [Cr]=0.27%, [Al]=0.0225%, [S]=0.005%; White slag refining time 17 minutes; The refining out-station temperature is controlled to be 1611 ℃, 33 minutes LF refining treatment time.
(4) VD refining procedure.Kept 12 minutes during molten steel application of vacuum vacuum 65Pa, 0.23MPa pressure Argon stirs simultaneously; The departures hydrogen content is 1.5ppm; Feed CaSi silk 135m, improve fluidity molten steel and inclusion modification and handle; Feed after the CaSi silk finishes, carry out pressure and be the soft blow operation 8 minutes of 0.18MPa; Adjust arrive at a station 1567 ℃ of temperature of continuous casting.
(5) continuous casting working procedure: casting blank section Φ 160mm.Continuous casting is big to wrap tundish, tundish takes whole process to add protective casing protection cast to crystallizer; The casting machine secondary cooling water adopts three sections distributions, specific water 1.00L/Kg; 28 ℃ of the degrees of superheat of molten steel, pulling rate 2.6m/min.
Embodiment three:
(1) goes into the stove molten iron: [Si]=0.55%, [P]=0.067%, [S]=0.026%.
(2) converter smelting.Smelt steel grade 30Mn2Cr, take catch carbon practice, tapping [C]=0.12%, [P]=0.011%; Employing pushing off the slag tapping, following slag thickness 35mm.
(3) LF refining.Composition Control [C]=0.31%, [Si]=0.26%, [Mn]=1.61%, [Cr]=0.28%, [Al]=0.0195%, [S]=0.008%; White slag refining time 19 minutes; The refining out-station temperature is controlled to be 1608 ℃, 34 minutes LF refining treatment time.
(4) VD refining procedure.Kept 13 minutes during molten steel application of vacuum vacuum 62Pa, 0.18MPa pressure Argon stirs simultaneously; The departures hydrogen content is 1.2ppm; Feed CaSi silk 140m, improve fluidity molten steel and inclusion modification and handle; Feed after the CaSi silk finishes, carry out pressure and be the soft blow operation 10 minutes of 0.18MPa; Adjust arrive at a station 1562 ℃ of temperature of continuous casting.
(5) continuous casting working procedure: casting blank section Φ 180mm.Continuous casting is big to wrap tundish, tundish takes whole process to add protective casing protection cast to crystallizer; The casting machine secondary cooling water adopts three sections distributions, specific water 0.95L/Kg; 24 ℃ of the degrees of superheat of molten steel, pulling rate 2.1m/min.
Embodiment four:
(1) goes into stove molten iron [Si]=0.60%, [P]=0.065%, [S]=0.025%.
(2) converter smelting.Smelt steel grade 30Mn2Cr, take catch carbon practice, tapping [C]=0.11%, [P]=0.009%;=adopt pushing off the slag to tap following slag thickness 30mm.
(3) LF refining.Composition Control [C]=0.31%, [Si]=0.29%, [Mn]=1.60%, [Cr]=0.29%, [Al]=0.0255%, [S]=0.007%; White slag refining time 18 minutes; The refining out-station temperature is controlled to be 1607 ℃.32 minutes LF refining treatment time.
(4) VD refining procedure.Kept 12 minutes during molten steel application of vacuum vacuum 65Pa, 0.22MPa pressure Argon stirs simultaneously; The departures hydrogen content is 1.5ppm; Feed CaSi silk 160m, improve fluidity molten steel and inclusion modification and handle; Feed after the CaSi silk finishes, carry out pressure and be the soft blow operation 6 minutes of 0.19MPa; Adjust arrive at a station 1562 ℃ of temperature of continuous casting.
(5) continuous casting working procedure: casting blank section Φ 200mm.Continuous casting is big to wrap tundish, tundish takes whole process to add protective casing protection cast to crystallizer; The casting machine secondary cooling water adopts three sections distributions, specific water 0.92L/Kg; . 28 ℃ of the degrees of superheat of molten steel, pulling rate 1.9m/min.
High-steel level oil bushing circular pipe blank according to process route of the present invention is produced uses through domestic correspondent, produces P110 level petroleum casing pipe seamless steel pipe smoothly, and the seamless steel pipe performance is as follows:
Yield strength: 860～930Mpa, tensile strength: 930～990Mpa, elongation rate: 19.0%～23.0%
Claims (6)
1, high-steel level oil bushing circle base, it is characterized in that the trade mark is 30Mn2Cr, its main component is (by % weight) C=0.28-0.34%, Si=0.20-0.35%, Mn=1.40-1.80%, Cr=0.25-0.34%, P≤0.025%, S≤0.025%, Al=0.01-0.03%, and the Fe of aequum, circle base diameter 150-200mm.
2, high-steel level oil bushing as claimed in claim 1 circle base, adopt the process route of top and bottom combined blown converter → LF refining furnace → VD vacuum refining furnace → round billet continuous casting machine → turn over cooling bed → check → warehouse-in, it is characterized in that in the converter operation adopting oxygen to press is that 0.8-0.85MPa, flow are 22800-23200m
3The oxygen supply system of/h, argon bottom-blowing or nitrogen stir, and before the converter smelting, the slag making in mid-term takes off P, the P in the intermediary and later stages stabilizing slag also realizes that molten steel takes off S; Take pushing off the slag tapping control quantity of slag 0-50mm down; At the LF refining procedure, use refining slag, make the foaming white slag, white slag refining 15-20 minute, the LF refining procedure is with 30-35 minute, and the temperature that controls to the VD vacuum refining furnace is 1610 ± 5 ℃; In VD vacuum refining operation, under molten steel vacuum≤67Pa, kept 10-15 minute, adopting pressure simultaneously is the Argon stirring of 0.15-0.25MPa, feeds the CaSi silk after the application of vacuum, carries out the soft blow operation then; In the round billet continuous casting operation, wherein secondary cooling water divides three sections, and one section accounts for 30%, two section and accounts for 50%, three section and account for 20%, and specific water 0.92-1.10L/Kg, pulling rate are 1.7m-3.2m/min, and use crystallizer electromagnetic agitation technology.
3, as high-steel level oil bushing as described in the claim 2 with circle base production process route, it is characterized in that in the converter operation, go into converter molten iron [Si]=0.30-0.85%, [P]=0-0.080%, [S]=0-0.030%, in ladle, add in the tapping process with CaF
2, CaO is main synthetic slag charge, takes catch carbon practice, makes molten steel [C]=0.10-0.15%, [P]=0-0.012%.
4, as high-steel level oil bushing as described in the claim 2 with circle base production process route, it is characterized in that refining procedure at LF, use composition to be CaO=40-48%, Al
2O
3=38-45%, MgO=6-10%, SiO
2=0.5-6%, Fe
2O
3The refining slag of=0.1-2%; Make the molten steel composition be controlled at preferable range C=0.30-0.32%, Si=0.25-0.29%, Mn=1.57-1.63%, Cr=0.27-0.31%, P≤0.020%, S≤0.010%, Al=0.010-0.030%.
5, as high-steel level oil bushing as described in the claim 2 with circle base production process route, it is characterized in that in VD vacuum refining operation, wherein feeding the CaSi filament length is 130-170m, carrying out pressure then is the soft blow operation of 0.15-0.20Mpa, 5-10 minute soft blow time, making molten steel departures hydrogen content is 0-2ppm, is 1565 ± 5 ℃ to continuous casting platform temperature.
6, as high-steel level oil bushing as described in the claim 2 with circle base production process route, it is characterized in that in the round billet continuous casting operation, tundish adopts MgCa matter coating material that barricade is set, the degree of superheat of molten steel is controlled in the 20-35 ℃ of scope, ladle takes to add protective casing to tundish, tundish to crystallizer whole process in the casting process, protects cast; Described crystallizer (M-EMS) electromagnetic agitation technology promptly adopts by 6 coils and forms, and central magnetic field intensity reaches 0.08-0.12T.
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2008
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| CN111809113A (en) * | 2020-06-24 | 2020-10-23 | 延安嘉盛石油机械有限责任公司 | TC-50 steel grade petroleum pipe blank containing rare earth |
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