CN101086203B - Method for producing continuous casting round billet for petroleum bush using convertor process - Google Patents

Method for producing continuous casting round billet for petroleum bush using convertor process Download PDF

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CN101086203B
CN101086203B CN2007101192935A CN200710119293A CN101086203B CN 101086203 B CN101086203 B CN 101086203B CN 2007101192935 A CN2007101192935 A CN 2007101192935A CN 200710119293 A CN200710119293 A CN 200710119293A CN 101086203 B CN101086203 B CN 101086203B
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refining
slag
continuous casting
molten steel
converter
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CN101086203A (en
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潘贻芳
李树庆
袁章福
侯葵
王永然
蔡振胜
王宝明
任茂勇
李建强
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Tianjin Iron&Steel Group Co., Ltd.
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TIANJIN IRON&STEEL CO Ltd
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Abstract

A method of producing continuous casting round billet special for oil annular tube with converter technology belongs to converter metallurgy method, and it is suitable for the production of oil annular tube steel. The 37Mn2V high strength oil annular tube steel control component in the invention is: [C]: 0.35-0.41%,[Si]: 0.17-0.35%,[Mn]: 1.40-1.60%,[P]: <=0.025%, [S]: <=0.020%,[V]: 0.08-0.14%,[Ni]: <=0.30%,[Cr]: <=0.30%,[Cu]: <=0.20%, [Mo]: <=0.15%. The specific process steps of the invention are: blast furnace -> converter roof-to-floor re-blowing -> LF refining furnace -> VD vacuum furnace -> Phi150 mm - Phi200 mm round billet conticaster -> turnover cooling bed -> testing -> storing. The advantages of the invention are: the products quality id better compared with the electric furnace production technology, the quality of residual elements (such as Cu, Sn, Ni, Pb, Sb, etc.) is low, the gas and inclusion is less and the purity of molten steel is high.

Description

A kind of method with producing continuous casting round billet for petroleum bush using convertor process
Technical field
The invention belongs to the converter field of metallurgy, a kind of method with producing continuous casting round billet for petroleum bush using convertor process particularly is provided.
Background technology
Petroleum casing pipe is a kind of critical equipment that is widely used in field of petroleum exploitation, and it mainly acts on is fixing oil well wall, is the very high metallurgic product of technology content and added value.Because the particularity of process for petroleum recovery, the quality of petroleum casing pipe is directly connected to the production safety of oil well.The outside of sleeve pipe will be born the ground on all kinds of stratum and be pressed and phreatic pressure, the interior pressure of mud and the pressure of water vapour then will be born in the inside of sleeve pipe, sometimes also to bear the erosion of corrosive liquids and gas, therefore require petroleum casing pipe should have good comprehensive mechanical property.And along with the continuing of petroleum industry, fast-developing, simultaneously because the geological conditions in new exploitation oil field becomes increasingly complex, the degree of depth in oil field constantly increases.Therefore again kind, the performance of petroleum casing pipe proposed requirements at the higher level, also promoted the development and the exploitation of high strength petroleum sleeve pipe.The existing high anti-extrusion fracture strength of high strength petroleum sleeve pipe has the yield strength of internal pressure-resistant again, is mainly used in the oil well of deep-well or geological conditions relative complex, has wide market prospects.
At present, China's oil sleeve pipe raw material mainly is to use hot rolling circle base, seldom uses continuous cast round billets.Compare with hot rolling circle base, continuous cast round billets has remarkable advantages such as technology is simple, lumber recovery is high, energy consumption is low, is the developing direction of petroleum casing pipe raw material.What the domestic production continuous cast round billets adopted basically now is electric furnace steel making, and its technological process is: electric arc furnaces → refining → continuous casting steel machine.The successful experience of converter exploitation J55 oil casing pipe steel is summed up by Tianjin Iron﹠Steel Co., Ltd., in conjunction with day steel advanced person's a technological equipment and a technical level, decision adopts blast furnace → converter → LF stove → VD stove → continuous casting process to develop 37Mn2V high strength petroleum casing steel.
Summary of the invention
The object of the present invention is to provide a kind of method with producing continuous casting round billet for petroleum bush using convertor process.Improve the molten steel degree of purity, alleviated the harm that the micro residue element brings, improved the comprehensive mechanical property of oil casing steel.
The chemical composition of 37Mn2V high strength petroleum casing steel of the present invention is:
Be controlled to and be divided into: [C]: 0.35~0.41%, [Si]: 0.17~0.35%, [Mn]: 1.40~1.60%, [P] :≤0.025%, [S] :≤≤ 0.020%, [V]: 0.08~0.14%, [Ni] :≤0.30%, [Cr] :≤0.30%, [Cu] :≤0.20%, [Mo] :≤0.15%.
Preferred component of the present invention is: [C]: 0.36~0.38%, [Si]: 0.23~0.28%, [Mn]: 1.47~1.52%, [P] :≤0.020%, [S]: 0~0.010%, [V]: 0.10~0.12%, [Ni] :≤0.30%, [Cr] :≤0.30%, [Cu] :≤0.20%, [Mo] :≤0.15%.
In addition, 37Mn2V requires its content to be≤250ppm to Pb, Sn, As, Sb, Bi constituent content summation in the steel.
Technology of the present invention:
Blast furnace → top and bottom combined blown converter → LF refining furnace → VD vacuum drying oven → Φ 150mm~Φ 200mm round billet continuous casting machine → turn over cooling bed → check → warehouse-in.Concrete processing step:
(1) raw material: take the fine fodder principle, go into the requirement of stove molten iron: [Si]: 0.30~0.85%, [P]: 0~0.080%, [S]: 0~0.030%.
(2) converter smelting: molten iron enters top and bottom combined blown converter smelting, compares 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-supplying technology, 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 slag making in mid-term takes off P, S is taken off in the intermediary and later stages slag making; Converter tapping is taked the pushing off the slag tapping, and control is the quantity of slag 0~50mm down, prevents rephosphorization; Add synthetic slag charge (Main Ingredients and Appearance is CaF, CaO) in the tapping process and carry out wash heat in ladle, further desulfurization goes to be mingled with; Take catch carbon practice, converter tapping target call [C]: 0.10~0.20%, [P]: 0~0.010%.
(3) LF refining: because this steel grade requires composition uniform and stable, fluctuation range is little between each heat, strict to inclusion content of steel, therefore the LF refining procedure is controlled around adjustment and evening chemical composition, steel inclusion sex change and removal, adjustment temperature etc., the control range of [C], [Si], [Mn], [V], [S] is in the molten steel in the LF refining process: [C]: 0.35~0.41%, [Si]: 0.17~0.35%, [Mn]: 1.40~1.60%, [V]: 0.08~0.14%, [S]: 0~0.020%; Its preferable range is: [C]: 0.36~0.38%, [Si]: 0.23~0.28%, [Mn]: 1.47~1.52%, [V]: 0.10~0.12%, [S]: 0~0.010%; The temperature of arriving at a station of control VD refining is 1610 ± 5 ℃.
At the characteristics of this kind develop a kind of special-purpose refining slag (special-purpose refining slag has been applied for patent of invention, application number: 200610011709.7, composition is: CaO:40~48%; Al 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 minutes, the LF refining treatment time was at 30~35 minutes.
(4) VD refining procedure: the molten steel application of vacuum requires to keep under vacuum≤67Pa 10~15 minutes, and adopting pressure simultaneously is the weak Argon stirring of 0.15~0.25MPa, avoids turning over greatly; After application of vacuum finishes, feed CaSi silk 80~120m, 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 0.15~0.20MPa soft blow operation, guarantees 5~10 minutes 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 ℃.
(5) continuous casting: 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:
A. 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;
B. rationally control the casting machine secondary cooling water and distribute and the secondary cooling water specific water, guarantee the even of secondary cooling.Being assigned as one section and accounting for 33%, two section and account for 48%, three section and account for 19% of secondary cooling water, specific water 0.90~1.10L/Kg is to reach the generation that reduces even stop slab surface crack;
C. the degree of superheat of molten steel is controlled in 20~35 ℃ of scopes, stable pulling rate is 1.7~3.2m/min, according to the preferable range of different size pulling rate is: Φ 150mm:2.8~3.2m/min, Φ 160mm:2.5~2.9m/min, Φ 180mm:2.0~2.4m/min, Φ 200mm:1.7~2.0m/min;
D. tundish is provided with barricade, removes to promote inclusion floating.The tundish coating adopts the MgCa material, and what alleviate that the tundish refractory corrosion brings is mingled with pollution to molten steel;
E. use the crystallizer electromagnetic agitation, guarantee strand crystalline structure densification, even, reduce strand column crystal rate, avoid defectives such as strand crackle, shrinkage cavity, improve the surface quality of continuous casting billet.
Owing to add the responsive element V of crackle in the high strength petroleum casing steel, therefore need certain N content, the V with in the fixing steel makes molten steel in process of setting, separates out a large amount of VC or VN compound at crystal boundary, plays crystal grain thinning and precipitation strength effect.And, increased the crack sensitivity of this steel grade because VN compound separating out in the solidification of molten steel process caused the brittle zone of steel to move to wide dark direction.If casting machine two cold controls are improper, can with aligning slab surface crack be increased the weight of owing to the high-temperature region thermal stress distribution is uneven, cause steel pipe defectives such as outer folding, pipe to occur.
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 sleeve pipe oxidation-less casting technology, guarantee continuous casting billet structure evenly, surface and inherent quality optimum.
The invention has the advantages that: compare with the electric furnace production technology, residual elements in the steel (as Cu, Sn, Ni, Pb, Sb etc.) content is low, gas and to be mingled with content few, and the molten steel high purity, thereby the quality of steel grade is higher; The strictness of steel grade chemical Composition Control, the supply of material is even by the gross, fluctuation is little; The employing combined blown converter is smelted, and the oxygen rifle adopts the low pressure and mass flow shower nozzle, and blowing is steady, and composition and temperature shoot straight; In ladle, add synthetic slag charge 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, guarantee all degenerative treatments of even field trash of composition adjustment, reduce inclusion content of steel, improve the molten steel degree of purity; The refining slag of independent development exploitation is adopted in the refining of LF stove, promotes the absorption of field trash to remove; Casting process adopts crystallizer electromagnetic agitation technology, improves slab quality.
The specific embodiment
Embodiment 1
The technological process of production: blast furnace → top and bottom combined blown converter → LF refining furnace → VD vacuum drying oven → round billet continuous casting machine → turn over cooling bed → check → warehouse-in.
(1) goes into the stove molten iron: [Si]: 0.38%, [P]: 0.058%, [S]: 0.026%.
(2) converter smelting
Smelt steel grade 37Mn2V, it is that 0.8MPa, flow are 22800m that top and bottom combined blown converter oxygen supply system oxygen is pressed 3/ h, argon bottom-blowing or nitrogen stir; P is taken off in preceding, slag making in mid-term, and S is taken off in the intermediary and later stages slag making, takes catch carbon practice then, during tapping [C]: 0.13%, [P]: 0.008%; Converter tapping adopts the pushing off the slag tapping, and strict control is slag down, following slag thickness 45mm.In ladle, add special-purpose synthetic slag charge in the tapping process and carry out wash heat.
(3) LF refining
Composition Control: [C]: 0.36%, [Si]: 0.26%, [Mn]: 1.48%, [V]: 0.10%, [S]: 0.005%; Special-purpose refining slag is used in refining, makes the foaming white slag, white slag refining time 18 minutes; The refining out-station temperature is controlled to be 1611 ℃; 31 minutes LF refining treatment time.
(4) VD refining procedure
Molten steel application of vacuum vacuum 60Pa, 10 minutes retention times, 0.20MPa pressure Argon stirs simultaneously; The departures hydrogen content is 1.8ppm; Feed CaSi silk 100m, improve fluidity molten steel and inclusion modification and handle; Feed after silk finishes, carry out pressure and be the soft blow operation 9 minutes of 0.17MPa; Adjust arrive at a station 1562 ℃ of temperature of continuous casting.
(5) continuous casting working procedure: casting blank section Φ 150mm
A. the big tundish, tundish of wrapping of continuous casting takes whole process to add protective casing protection cast to crystallizer;
B. the casting machine secondary cooling water distributes and the secondary cooling water specific water, and one section accounts for 33%, two section and accounts for 48%, three section and account for 19%, specific water 1.10L/Kg;
C. the degree of superheat of molten steel is 25 ℃, pulling rate 3.0m/min;
D. tundish is provided with barricade;
E. use the crystallizer electromagnetic agitation;
Embodiment 2
The technological process of production: blast furnace → top and bottom combined blown converter → LF refining furnace → VD vacuum drying oven → round billet continuous casting machine → turn over cooling bed → check → warehouse-in.
(1) goes into the stove molten iron: [Si]: 0.45%, [P]: 0.071%, [S]: 0.023%.
(2) converter smelting
Smelt steel grade 37Mn2V, it is that 0.82MPa, flow are 22900m that top and bottom combined blown converter oxygen supply system oxygen is pressed 3/ h, argon bottom-blowing or nitrogen stir; P is taken off in preceding, slag making in mid-term, and S is taken off in the intermediary and later stages slag making, takes catch carbon practice then, during tapping [C]: 0.15%, [P]: 0.007%; Converter tapping adopts the pushing off the slag tapping, and strict control is slag down, following slag thickness 40mm.In ladle, add special-purpose synthetic slag charge in the tapping process and carry out wash heat.
(3) LF refining
Composition Control: [C]: 0.38%, [Si]: 0.24%, [Mn]: 1.50%, [V]: 0.11%[S]: 0.006%; Special-purpose refining slag is used in refining, makes the foaming white slag, white slag refining time 17 minutes; The refining out-station temperature is controlled to be 1609 ℃; 32 minutes LF refining treatment time.
(4) VD refining procedure
Molten steel application of vacuum vacuum 63Pa, 13 minutes retention times, 0.19MPa pressure Argon stirs simultaneously; The departures hydrogen content is 1.6ppm; Feed CaSi silk 90m, improve fluidity molten steel and inclusion modification and handle; Feed after silk finishes, carry out pressure and be the soft blow operation 10 minutes of 0.18MPa; Adjust arrive at a station 1564 ℃ of temperature of continuous casting.
(5) continuous casting working procedure: casting blank section Φ 160mm
A. the big tundish, tundish of wrapping of continuous casting takes whole process to add protective casing protection cast to crystallizer;
B. the casting machine secondary cooling water distributes and the secondary cooling water specific water, and one section accounts for 33%, two section and accounts for 48%, three section and account for 19%, specific water 1.00L/Kg;
C. the degree of superheat of molten steel is 30 ℃, pulling rate 2.7m/min;
D. tundish is provided with barricade;
E. use the crystallizer electromagnetic agitation;
Embodiment 3
The technological process of production: blast furnace → top and bottom combined blown converter → LF refining furnace → VD vacuum drying oven → round billet continuous casting machine → turn over cooling bed → check → warehouse-in.
(1) goes into the stove molten iron: [Si]: 0.57%, [P]: 0.060%, [S]: 0.019%.
(2) converter smelting
Smelt steel grade 37Mn2V, it is that 0.83MPa, flow are 23100m that top and bottom combined blown converter oxygen supply system oxygen is pressed 3/ h, argon bottom-blowing or nitrogen stir; P is taken off in preceding, slag making in mid-term, and S is taken off in the intermediary and later stages slag making, takes catch carbon practice then, during tapping [C]: 0.16%, [P]: 0.009%; Converter tapping adopts the pushing off the slag tapping, and strict control is slag down, following slag thickness 30mm.In ladle, add special-purpose synthetic slag charge in the tapping process and carry out wash heat.
(3) LF refining
Composition Control: [C]: 0.36%, [Si]: 0.27%, [Mn]: 1.51%, [V]: 0.12%, [S]: 0.006%; Special-purpose refining slag is used in refining, makes the foaming white slag, white slag refining time 19 minutes; The refining out-station temperature is controlled to be 1614 ℃; 34 minutes LF refining treatment time.
(4) VD refining procedure
Molten steel application of vacuum vacuum 60Pa, 15 minutes retention times, 0.20MPa pressure Argon stirs simultaneously; The departures hydrogen content is 1.8ppm; Feed CaSi silk 100m, improve fluidity molten steel and inclusion modification and handle; Feed after silk finishes, carry out pressure and be the soft blow operation 9 minutes of 0.18MPa; Adjust arrive at a station 1568 ℃ of temperature of continuous casting.
(5) continuous casting working procedure: casting blank section Φ 180mm
A. the big tundish, tundish of wrapping of continuous casting takes whole process to add protective casing protection cast to crystallizer;
B. the casting machine secondary cooling water distributes and the secondary cooling water specific water, and one section accounts for 33%, two section and accounts for 48%, three section and account for 19%, specific water 0.95L/Kg;
C. the degree of superheat of molten steel is 25 ℃, pulling rate 2.2m/min;
D. tundish is provided with barricade;
E. use the crystallizer electromagnetic agitation;
Embodiment 4
The technological process of production: blast furnace → top and bottom combined blown converter → LF refining furnace → VD vacuum drying oven → round billet continuous casting machine → turn over cooling bed → check → warehouse-in.
(1) goes into the stove molten iron: [Si]: 0.70%, [P]: 0.065%, [S]: 0.021%.
(2) converter smelting
Smelt steel grade 37Mn2V, it is that 0.85MPa, flow are 23200m that top and bottom combined blown converter oxygen supply system oxygen is pressed 3/ h, argon bottom-blowing or nitrogen stir; P is taken off in preceding, slag making in mid-term, and S is taken off in the intermediary and later stages slag making, takes catch carbon practice then, during tapping [C]: 0.18%, [P]: 0.006%; Converter tapping adopts the pushing off the slag tapping, and strict control is slag down, following slag thickness 35mm.In ladle, add special-purpose synthetic slag charge in the tapping process and carry out wash heat.
(3) LF refining
Composition Control: [C]: 0.37%, [Si]: 0.25%, [Mn]: 1.47%, [V]: 0.11%, [S]: 0.004%; Special-purpose refining slag is used in refining, makes the foaming white slag, white slag refining time 16 minutes; The refining out-station temperature is controlled to be 1613 ℃; 33 minutes LF refining treatment time.
(4) VD refining procedure
Molten steel application of vacuum vacuum 65Pa, 12 minutes retention times, the 0.24MPa Argon stirs simultaneously; The departures hydrogen content is 1.5ppm; Feed CaSi silk 120m, improve fluidity molten steel and inclusion modification and handle; Feed after silk finishes, carry out pressure and be the soft blow operation 7 minutes of 0.19MPa; Adjust arrive at a station 1566 ℃ of temperature of continuous casting.
(5) continuous casting working procedure: casting blank section Φ 200mm
A. the casting machine secondary cooling water distributes and the secondary cooling water specific water, and one section accounts for 33%, two section and accounts for 48%, three section and account for 19%, specific water 0.92L/Kg;
B. the big tundish, tundish of wrapping of continuous casting takes to add protective casing protection cast to crystallizer;
C. the degree of superheat of molten steel is 28 ℃, pulling rate 1.8m/min;
D. tundish is provided with barricade;
E. use the crystallizer electromagnetic agitation.

Claims (3)

1. method with producing continuous casting round billet for petroleum bush using convertor process, it is characterized in that: processing step is: the blast-melted top and bottom combined blown converter smelting that enters, LF refining furnace, the refining of VD vacuum drying oven are adopted in the tapping back, use φ 150mm~φ 200mm round billet continuous casting machine continuous casting again, last turn over cooling bed, check, warehouse-in;
Top and bottom combined blown converter technology is:
Go into the requirement of stove molten iron: [Si]: 0.30~0.85%, [P]: 0~0.080%, [S]: 0~0.030%; It is that 0.8~0.85MPa, flow are 22800~23200m that top and bottom combined blown converter adopts oxygen to press 3/ h, argon bottom-blowing or nitrogen stir; P is taken off in preceding, the slag making in mid-term of converter smelting, and S is taken off in the intermediary and later stages slag making; Converter tapping is taked the pushing off the slag tapping, and control is the quantity of slag 0~50mm down; Require molten steel [C], [P] to reach [C] during converter tapping: 0.10~0.20%, [P]: 0~0.010%;
The LF refinery practice is:
The control range of [C], [Si], [Mn], [V], [S] is in the molten steel in the LF refining process: [C]: 0.35~0.41%, [Si]: 0.17~0.35%, [Mn]: 1.40~1.60%, [V]: 0.08~0.14%, [S]: 0~0.020%; Use special-purpose refining slag in the refining process, make the foaming white slag, white slag refining time 15~20 minutes, refining time are 30~35 minutes; The temperature of arriving at a station of control VD refining is 1610 ± 5 ℃; Described special-purpose refining slag composition is: CaO:40~48%; Al 2O 3: 38~45%; MgO:6~10%; SiO 2: 0.5~6%; Fe 2O 3: 0.1~2%;
The VD refinery practice is:
The molten steel application of vacuum requires 10~15 minutes following retention times of vacuum≤67Pa, and adopting pressure simultaneously is the Argon stirring of 0.15~0.25MPa; The VD application of vacuum finishes the back and feeds CaSi silk 80~120m; After feeding the end of CaSi silk, carrying out pressure is the soft blow operation of 0.15~0.20MPa, 5~10 minutes soft blow time; The departures hydrogen content is 0~2ppm; The continuous casting temperature of arriving at a station is 1565 ± 5 ℃;
Round billet continuous casting technology is:
Control caster two cold water distribution and secondary cooling water specific water, being distributed as a section and accounting for 33%, two section and account for 48%, three section and account for 19%, specific water 0.90~1.10L/Kg of water; 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; The degree of superheat of molten steel is controlled in 20~35 ℃ of scopes, and stable pulling rate is 1.7~3.2m/min; Tundish is provided with barricade, adopts MgCa matter coating material, and what alleviate that the tundish refractory corrosion brings is mingled with pollution to molten steel; Use the crystallizer electromagnetic agitating technology.
2. in accordance with the method for claim 1, it is characterized in that: in the LF refining process in the molten steel control range of [C], [Si], [Mn], [V], [S] be: [C]: 0.36~0.38%, [Si]: 0.23~0.28%, [Mn]: 1.47~1.52%, [V]: 0.10~0.12%, [S]: 0~0.010%.
3. it is characterized in that in accordance with the method for claim 1: round billet continuous casting according to the stable pulling rate of different size is: φ 150mm:2.8~3.2m/min, φ 160mm:2.5~2.9m/min, φ 180mm:2.0~2.4m/min, φ 200mm:1.7~2.0m/min.
CN2007101192935A 2007-07-19 2007-07-19 Method for producing continuous casting round billet for petroleum bush using convertor process Expired - Fee Related CN101086203B (en)

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