CN101701276A - Method for smelting steel round blank of pipeline with hydrogen sulfide corrosion resistance by convertor process - Google Patents

Method for smelting steel round blank of pipeline with hydrogen sulfide corrosion resistance by convertor process Download PDF

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Publication number
CN101701276A
CN101701276A CN200910228719A CN200910228719A CN101701276A CN 101701276 A CN101701276 A CN 101701276A CN 200910228719 A CN200910228719 A CN 200910228719A CN 200910228719 A CN200910228719 A CN 200910228719A CN 101701276 A CN101701276 A CN 101701276A
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refining
steel
converter
smelting
hydrogen sulfide
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王永然
巩文旭
罗卓
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Tianjin Iron and Steel Group Co Ltd
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Tianjin Iron and Steel Group Co Ltd
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    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02PCLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00Technologies related to metal processing
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Abstract

The invention belongs to the technical field of a smelting process of iron and steel, and in particular relates to a method for producing a steel 16MnVH continuous-casting round blank of a pipeline with hydrogen sulfide corrosion resistance by a convertor. In order to solve the problems of sulfide stress corrosion fracture and hydrogen caused fracture which are generated on an oil-gas conveying pipeline containing H2S, a convertor smelting process is invented. The process comprises the following steps: preprocessing the molten iron of a blast furnace, smelting by a convertor, processing by an LF refining furnace, refining by a VD vacuum furnace and preparing a round blank by continuous casting. The molten iron is preprocessed by a blowing particle magnesium desulfuration process, the convertor adopts top-bottom compound blowing, and an oxygen supply system with low oxygen pressure and large flow rate is used; LF refining adopts a high-alkalinity white slag refining process, white slag refining is carried out for 20-30 minutes, LF refining processing is carried out for 35-45 minutes, and the temperature of the molten steel reaching a VD refining station is 1625+/-5 DEG C; VD refining is kept for 10-15 minutes under the vacuum degree smaller than or equal to 67Pa, soft argon-blowing stirring is also adopted, the hydrogen content of the molten steel out of the VD station is controlled at 0-2ppm, and the temperature of the molten steel reaching a continuous casting platform is 1580+/-5 DEG C; and continuous casting adopts protective pouring, secondary cooling adopts a weak cooling mode, the superheating temperature of the molten steel is controlled at 20-40 DEG C, the pulling speed is 1.5-3.2m/min, and an electromagnetic stirring technology of a crystallizer is also used. By adopting the tube blank produced through the process, the performance of the hydrogen sulfide corrosion resistance of the steel is enhanced.

Description

A kind of method with the converter process smelting steel round blank of pipeline with hydrogen sulfide corrosion resistance
Technical field
The invention belongs to smelting iron and steel Technology field, particularly produce hydrogen sulfide corrosion-resistant oil gas and carry the method for using pipe line steel 16MnVH continuous cast round billets with converter process.
Technical background
Pipe-line transportation is most economical, the rational mode of transport of oil, Sweet natural gas.According to U.S. API SPEC5L standard code, transportation pipe can be divided into 8 classes such as weldless steel tube, electricresistance welded steel pipe, submerged-arc welding steel pipe by production technique, but commonly used has only 4 kinds of weldless steel tube (Seamless), vertical masonry joint high-frequency resistance welded tube (ERW) and straight-line joint submerged arc welding tube (LSAW), spiral seam submerged-arc welding pipes (SSAW) etc.
Weldless steel tube is because size, is used for few on the trunk main pipe-line.But because the difference of complete processing is compared with seam welded tube is arranged, weldless steel tube has certain advantage at aspects such as dimensional precision, surface quality, solidity to corrosion and comprehensive mechanical properties, and therefore the weldless steel tube consumption is very big on the non-main line pipe-line of short distance.Simultaneously containing H 2On the transportation pipe line of S, sulphide stress corrosion fracture (SSCC) and hydrogen-induced fracture (HIC) are the main failure forms of pipeline, and the generation of SSCC and HIC and severity are decided by H in the delivering gas medium 2The dividing potential drop of S.The international standard regulation is worked as P H2SDuring>300Pa, the requirement of anti-SSCC and anti-HIC must be proposed to the tubing that uses.
According to requirement of client, and in conjunction with the state of the art of the applicant's tooling, developed the method for blast furnace ironmaking → top and bottom combined blown converter → LF ladle refining furnace → VD vacuum outgas → round billet continuous casting explained hereafter hydrogen sulfide corrosion resistant transportation pipe line steel 16MnVH circle base, produced the transportation pipe line steel 16MnVH circle base of hydrogen sulfide corrosion resistant smoothly, and the supply client makes the transportation pipe line weldless steel tube of hydrogen sulfide corrosion resistant.
Summary of the invention
The objective of the invention is to overcome general weldless steel tube and containing H 2On the transportation pipe line of S, the phenomenon of sulphide stress corrosion fracture (SSCC) and hydrogen-induced fracture (HIC) takes place, and a kind of method of using the pipe line steel continuous cast round billets of carrying with blast furnace ironmaking → top and bottom combined blown converter → LF ladle refining furnace → VD vacuum outgas → round billet continuous casting explained hereafter hydrogen sulfide corrosion-resistant oil gas is provided.With the round base that this processing method is produced, for seamless steel tube production, having satisfied hydrogen sulfide corrosion resistance can requirement.
The method of converter process smelting steel round blank of pipeline with hydrogen sulfide corrosion resistance of the present invention mainly realizes by following method.
16MnVH hydrogen sulfide corrosion-resistant transportation pipe line composition of steel of the present invention is: control composition (weight percentage) is C=0.14-0.18%, Si=0.15-0.35%, Mn=1.10-1.40%, P≤0.020%, S≤0.008%, Als 〉=0.015%, V=0.03-0.08%, Ti≤0.04%, Nb≤0.05%, Cr≤0.25%, Mo≤0.10%, Ni≤0.25%, Cu≤0.25%, N≤0.25%, the Fe surplus.
The present invention optimizes composition (weight percentage): C=0.15-0.17%, Si=0.23-0.27%, Mn=1.22-1.28%, P≤0.020%, S≤0.005%, Als=0.015-0.035%, V=0.04-0.07%, Fe surplus.
The method of converter process smelting steel round blank of pipeline with hydrogen sulfide corrosion resistance provided by the invention, wherein main technique step content is: blast-melted pre-treatment → converter smelting → LF refining furnace → VD vacuum oven refining → continuous caster is cast Ф 150mm-Ф 200mm circle base → through turn over cooling bed → check → warehouse-in.Concrete processing step comprises:
1. blast-melted employing winding-up granular magnesium desulfurization technology is carried out the desulfurization pre-treatment to molten iron, makes into converter molten iron main component to reach [Si]=0.30-0.85%, [P]=0-0.080%, [S]=0-0.030%;
2. the top and bottom complex blowing smelting that the gas mixing of top blowing oxygen bottom blowing nitrogen/argon is mixed is adopted in converter, and employing oxygen pressure is 22800-23200m for 0.8-0.85MPa, flow 3The low oxygen pressure of/h, big flow top oxygen gun oxygen supply system make converter tapping molten steel composition [C]=0.05-0.08%, [P]=0-0.010%;
3. high basicity white slag refinery practice is adopted in the LF refining, white slag refining time 20-30 minute, the LF refining treatment time was at 35-45 minute, in the refining process, omnidistance argon bottom-blowing stirs, and the gas flow that stirs according to 3 kinds of patterns control of pre-blowing, bio-occlusion electricity, soft blow argon bottom-blowing, the temperature that controls to the VD refining station is 1625 ± 5 ℃;
4. in the VD refinery practice, the molten steel vacuum-treat will be at vacuum tightness≤67Pa 10-15 of following hold-time minute, and the argon of soft blow simultaneously stirs, and makes molten steel go out VD station hydrogen richness and be controlled at 0-2ppm, and the temperature that molten steel arrives the continuous casting platform is 1580 ± 5 ℃;
5. continuous casting process requires ladle to take whole process to add protective casing protection cast to tundish, tundish to crystallizer; the weak cold mode of two cold employings; molten steel overheat is controlled in the 20-40 ℃ of scope, and stable pulling rate is 1.5-3.2m/min, uses the crystallizer electromagnetic agitating technology.
The method of described converter process smelting steel round blank of pipeline with hydrogen sulfide corrosion resistance, strengthen the slag making dephosphorization in preceding, the mid-term of converter smelting, phosphorus in the intermediary and later stages stabilizing slag is also realized molten steel desulfurizing, adopt steel core aluminium final deoxygenation, advance dissolved oxygen a[O in the LF refining station steel]=0-15ppm, taking the following quantity of slag of pushing off the slag tapping and control is 0-50mm.
The method of described converter process smelting steel round blank of pipeline with hydrogen sulfide corrosion resistance, omnidistance control aluminium in the LF refining process, once feed sufficient aluminum steel before the refining departures, molten steel main component span of control is [C]=0.15-0.17% in the LF refining process, [Si]=0.23-0.27%, [Mn]=1.22-1.28%, [S]=0-0.005%, [V]=0.04-0.07%.
The method of described converter process smelting steel round blank of pipeline with hydrogen sulfide corrosion resistance, after the vacuum-treat of VD refinery practice finished, silico-calcium filament length degree was fed in decision according to the aluminium content in the steel; After feeding the end of silico-calcium silk, the soft blow argon stirred 5-10 minute.
The method of described converter process smelting steel round blank of pipeline with hydrogen sulfide corrosion resistance, tundish adopts MgCa matter coating in continuous casting process, and barricade is set; Control simultaneously that the casting machine secondary cooling water distributes and the secondary cooling water specific water, make being distributed as a section and accounting for 33%, two section and account for 48%, three section and account for 19%, specific water 0.85-1.05L/Kg of water.To two cold specific water's controls, is 1.05L/Kg for Ф 150mm according to the different size strand; For Ф 160mm is 0.95L/Kg; For Ф 180mm is 0.9L/Kg; For Ф 200mm is 0.85L/Kg; Stablizing pulling rate according to the different size strand is, is 2.5-3.2m/min for Ф 150mm; For Ф 160mm is 2.2-2.8m/min; For Ф 180mm is 1.8-2.3m/min; For Ф 200mm is 1.5-2.0m/min.
The invention has the advantages that providing a kind of produces the method for hydrogen sulfide corrosion-resistant oil gas conveying with pipe line steel 16MnVH continuous cast round billets with converter process.Production method of the present invention, harmful residual element (as As, Sn, Pb, Sb etc.) content is low in the steel, has alleviated the embrittlement of grain boundaries phenomenon of the steel that harmful residual element cause; Realize the dark desulfurization and the degassing of molten steel by refining, and the sex change of non-metallic inclusion such as sulfide, improved the cleanliness factor of molten steel; Add crystal grain thinning element aluminum and vanadium in the steel, effectively prevent growing up of in follow-up steel pipe's production process crystal grain, thereby improved the hydrogen sulfide corrosion resistance energy of steel.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; The LF refining procedure adopts omnidistance control aluminium technology, is beneficial to the control of restoring operation and inclusion; LF, VD refining procedure are furnished with ladle whole process BOTTOM ARGON BLOWING and ladle wire feeding equipment, can the effective elimination steel in gas, reduce inclusion content of steel, and realize that inclusion modification handles, improve the molten steel cleanliness factor; Continuous casting adopts crystallizer induction stirring technology, and tundish adopts MgCa matter coating, and barricade is set simultaneously, improves slab quality.
Concrete processing step process:
(1) raw material is taked the fine fodder principle, and blast-melted employing winding-up granular magnesium desulfurization technology is carried out the desulfurization pre-treatment to molten iron, makes into the converter hot metal composition to reach [Si]=0.30-0.85%, [P]=0-0.080%, [S]=0-0.030%.
(2) converter smelting: adopt top and bottom combined blown converter technology, 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 top oxygen gun oxygen supply, and it is that 0.8-0.85MPa, flow are 22800-23200m that oxygen is pressed 3/ h; The gas mixing of bottom blowing nitrogen/argon is mixed; Preceding, the medium profit of converter smelting is strengthened the slag making dephosphorization with the lower favourable condition of liquid steel temperature, and the phosphorus in the intermediary and later stages stabilizing slag is also realized molten steel desulfurizing; Take pushing off the slag tapping in the converter tapping process, control is quantity of slag 0-50mm down, prevents rephosphorization, improves yield of alloy and reduces non-metallic inclusion in the steel; (major ingredient 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; Final deoxygenation adopts the steel core aluminium deoxidation, guarantees the LF refining dissolved oxygen a[O in the steel that enters the station]=0-15ppm.Take catch carbon practice, converter tapping target call molten steel [C]=0.05-0.08%, [P]=0-0.010%.
(3) LF refining: owing to require steel pipe to have the performance of good hydrogen sulfide corrosion resistant, therefore kind and content, the gas content etc. to this steel grade chemical ingredients, steel inclusion propose to be strict with, and the LF refining procedure is around adjusting and aspects such as the removal of evening chemical composition, nonmetallic inclusionsin steel, adjustment temperature are controlled.The span of control of molten steel main chemical compositions is in the LF refining process: [C]=0.14-0.18%, [Si]=0.17-0.35%, [Mn]=1.15-1.35%, [V]=0.03-0.08%, [P]≤0.025%, [S]≤0.008%.
The preferred span of control of its main component is [C]=0.15-0.17%, [Si]=0.23-0.27%, [Mn]=1.22-1.28%, [V]=0.04-0.07%, [P]≤0.020%, [S]≤0.005%.
In the refining process, adopt the technology of omnidistance control aluminium; Adopt high basicity white slag refinery practice; White slag refining time 20-30 minute, the LF refining treatment time was at 35-45 minute.In the refining process, omnidistance argon bottom-blowing stirs, and according to the gas flow that pre-blowing, bio-occlusion electricity, 3 kinds of pattern control of soft blow argon bottom-blowing stir, guarantees the Argon effect.Once feed sufficient aluminum steel before the LF refining departures; Controlling to the VD purified temperature of arriving at a station is 1625 ± 5 ℃.
(4) VD refining procedure: the molten steel vacuum-treat required at vacuum tightness≤67Pa 10-15 of following hold-time minute, adopted the soft blow argon to stir simultaneously, avoided turning over greatly; After vacuum-treat finished, silico-calcium silk quantity was fed in decision according to the aluminium content in the steel; Feeding the soft blow argon gas that carried out 5-10 minute behind the silico-calcium silk stirs; Guarantee that molten steel departures hydrogen richness is 0-2ppm; Temperature control, requiring the liquid steel temperature of arrival continuous casting platform is 1580 ± 5 ℃.
(5) continuous casting: Ф 150mm-Ф 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 purity of molten steel;
B. the weak cold mode of two cold employings is rationally controlled the casting machine secondary cooling water and is distributed and the secondary cooling water specific water, guarantees that two cold refrigerative are even; Being distributed as one section and accounting for 33%, two section and account for 48%, three section and account for 19% of water; Is 1.05L/Kg according to the different control ratio water yields of casting blank specification for Ф 150mm, and Ф 160mm is 0.95L/Kg, and Ф 180mm is 0.9L/Kg, and Ф 200mm is 0.85L/Kg.
C. molten steel overheat is controlled in the 20-40 ℃ of scope, stable pulling rate is 1.5-3.2m/min, is 2.5-3.2m/min according to the preferable range Ф 150mm of different size pulling rate, and Ф 160mm is 2.2-2.8m/min, Ф 180mm is 1.8-2.2m/min, and Ф 200mm is 1.5-2.0m/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 induction stirring, guarantee strand crystal structure densification, even, reduce strand column crystal rate, avoid defectives such as strand crackle, shrinkage cavity.
Embodiment
Embodiment 1
(1) goes into the stove molten iron: [Si]=0.45%, [P]=0.070%, [S]=0.028%.
(2) converter smelting:
Smelt steel grade 16MnVH, it is that 0.8MPa, flow are 23000m that top and bottom complex blowing, oxygen are pressed 3/ h, P is taken off in preceding, slag making in mid-term, and S is taken off in the intermediary and later stages slag making; [C]=0.07%, [P]=0.009% during tapping; Converter tapping adopts pushing off the slag tapping, following slag thickness 40mm.In ladle, add special-purpose synthetic slag charge 400kg in the tapping process.
(3) LF refining:
Main component control: [C]=0.17%, [Si]=0.25%, [Mn]=1.24%, [V]=0.045%, [S]=0.005%; Enter the station and decide oxygen a[O]=12ppm; White slag refining time 21 minutes; The refining out-station temperature is controlled to be 1625 ℃, 38 minutes LF refining treatment time.
(4) VD refining procedure:
Kept 10 minutes during molten steel vacuum-treat vacuum tightness 60Pa, Argon stirs simultaneously; The departures hydrogen richness is 1.2ppm; Feed silico-calcium silk 180m, improve fluidity molten steel and inclusion modification and handle; After feeding the end of silico-calcium silk, soft blow operation 9 minutes; Adjust arrive at a station 1578 ℃ of temperature of continuous casting.
(5) continuous casting working procedure: casting blank section Ф 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 1.05L/Kg;
C. the superheating temperature of tundish molten steel is 25 ℃, pulling rate 3.0m/min;
D. tundish is provided with barricade;
E. use the crystallizer induction stirring.
Embodiment 2
(1) goes into the stove molten iron: [Si]=0.50%, [P]=0.075%, [S]=0.025%.
(2) converter smelting:
Smelt steel grade 16MnVH, it is that 0.82MPa, flow are 22900m that top and bottom complex blowing, oxygen are pressed 3/ h, P is taken off in preceding, slag making in mid-term, and S is taken off in the intermediary and later stages slag making; [C]=0.06%, [P]=0.010% during tapping; Converter tapping adopts pushing off the slag tapping, following slag thickness 45mm.In ladle, add special-purpose synthetic slag charge 300kg simultaneously in the tapping process.
(3) LF refining:
Main component control: [C]=0.16%, [Si]=0.26%, [Mn]=1.26%, [V]=0.043%, [S]=0.004%; Enter the station and decide oxygen a[O]=10ppm; White slag refining time 23 minutes; The refining out-station temperature is controlled to be 1614 ℃, 35 minutes LF refining treatment time.
(4) VD refining procedure:
Kept 12 minutes during molten steel vacuum-treat vacuum tightness 65Pa, Argon stirs simultaneously; The departures hydrogen richness is 1.5ppm; Mend and feed aluminum steel 80m, feed silico-calcium silk 280m; After feeding the end of silico-calcium silk, soft blow operation 8 minutes; Adjust arrive at a station 1581 ℃ of temperature of continuous casting.
(5) continuous casting working procedure: casting blank section Ф 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 0.95L/Kg;
C. the superheating temperature of tundish molten steel is 28 ℃, pulling rate 2.6m/min;
D. tundish is provided with barricade;
E. use the crystallizer induction stirring.
Embodiment 3
(1) goes into the stove molten iron: [Si]=0.55%, [P]=0.067%, [S]=0.026%.
(2) converter smelting
Smelt steel grade 16MnVH, top and bottom complex blowing, oxygen are pressed and are 0.83MPa, flow 23000m 3/ h, P is taken off in preceding, slag making in mid-term, and S is taken off in the intermediary and later stages slag making; [C]=0.08%, [P]=0.011% during tapping; Converter tapping adopts pushing off the slag tapping, following slag thickness 35mm.In ladle, add special-purpose synthetic slag charge 400kg simultaneously in the tapping process.
(3) LF refining
Main component control: [C]=0.15%, [Si]=0.24%, [Mn]=1.22%, [V]=0.052%, [S]=0.003%; Enter the station and decide oxygen a[O]=9ppm; White slag refining time 25 minutes; The refining out-station temperature is 1627 ℃, 40 minutes LF refining treatment time.
(4) VD refining procedure
Kept 13 minutes during molten steel vacuum-treat vacuum tightness 62Pa, Argon stirs simultaneously; The departures hydrogen richness is 1.2ppm; Feed silico-calcium silk 210m; After feeding the end of silico-calcium silk, soft blow operation 10 minutes; Adjust arrive at a station 1578 ℃ of temperature of continuous casting.
(5) continuous casting working procedure: casting blank section Ф 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 0.90L/Kg;
C. the superheating temperature of tundish molten steel is 28 ℃, pulling rate 2.1m/min;
D. tundish is provided with barricade;
E. use the crystallizer induction stirring.
Embodiment 4
(1) goes into the stove molten iron: [Si]=0.60%, [P]=0.065%, [S]=0.025%.
(2) converter smelting:
Smelt steel grade 16MnVH, it is that 0.85MPa, flow are 23200m that top and bottom complex blowing, oxygen are pressed 3/ h, P is taken off in preceding, slag making in mid-term, and S is taken off in the intermediary and later stages slag making; [C]=0.06%, [P]=0.006% during tapping; Converter tapping adopts pushing off the slag tapping, following slag thickness 30mm.In ladle, add special-purpose synthetic slag charge 450kg simultaneously in the tapping process.
(3) LF refining
Main component control: [C]=0.15%, [Si]=0.27%, [Mn]=1.27%, [V]=0.048%, [S]=0.003%; Enter the station and decide oxygen a[O]=8ppm; White slag refining time 23 minutes; The refining out-station temperature is controlled to be 1626 ℃.38 minutes LF refining treatment time.
(4) VD refining procedure
Kept 12 minutes during molten steel vacuum-treat vacuum tightness 65Pa, Argon stirs simultaneously; The departures hydrogen richness is 1.5ppm; Feed silico-calcium silk 260m; After feeding the end of silico-calcium silk, soft blow operation 6 minutes; Adjust arrive at a station 1581 ℃ of temperature of continuous casting.
(5) continuous casting working procedure: casting blank section Ф 200mm
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 0.85L/Kg;
C. the superheating temperature of tundish molten steel is 27 ℃, pulling rate 1.8m/min;
D. tundish is provided with barricade;
E. use the crystallizer induction stirring.

Claims (8)

1. the invention provides a kind of method of converter process smelting steel round blank of pipeline with hydrogen sulfide corrosion resistance, wherein the main technique step is: blast-melted pre-treatment → converter smelting → LF refining furnace → VD vacuum oven refining → continuous caster is cast Ф 150mm-Ф 200mm circle base → through turn over cooling bed → check → warehouse-in; It is characterized in that:
1. blast-melted employing winding-up granular magnesium desulfurization technology is carried out the desulfurization pre-treatment to molten iron, makes into converter molten iron main component to reach [Si]=0.30-0.85%, [P]=0-0.080%, [S]=0-0.030%;
2. the top and bottom complex blowing smelting that top blowing oxygen bottom blowing nitrogen or argon gas stir is adopted in converter, and employing oxygen pressure is 22800-23200m for 0.8-0.85MPa, flow 3The low oxygen pressure of/h, big flow top oxygen supply system make converter molten steel tapping major ingredient be controlled to be [C]=0.05-0.08%, [P]=0-0.010%;
3. high basicity white slag refinery practice is adopted in the LF refining, white slag refining time 20-30 minute, the LF refining treatment time was at 35-45 minute, in the refining process, omnidistance argon bottom-blowing stirs, and the gas flow that stirs according to 3 kinds of patterns control of pre-blowing, bio-occlusion electricity, soft blow argon bottom-blowing, the temperature that controls to the VD refining station is 1625 ± 5 ℃;
4. in the VD refinery practice, the molten steel vacuum-treat will adopt the soft blow argon to stir at vacuum tightness≤67Pa 10-15 of following hold-time minute simultaneously, makes molten steel go out VD station hydrogen richness and is controlled at 0-2ppm, and the temperature that molten steel arrives the continuous casting platform is 1580 ± 5 ℃;
5. continuous casting process requires ladle to take whole process to add protective casing protection cast to tundish, tundish to crystallizer; the weak cold mode of two cold employings; molten steel overheat is controlled in the 20-40 ℃ of scope, and stable pulling rate is 1.5-3.2m/min, uses the crystallizer electromagnetic agitating technology.
2. the method for converter process smelting steel round blank of pipeline with hydrogen sulfide corrosion resistance according to claim 1, strengthen the slag making dephosphorization preceding, the mid-term that it is characterized in that converter smelting, phosphorus in the intermediary and later stages stabilizing slag is also realized molten steel desulfurizing, adopt steel core aluminium final deoxygenation, advance dissolved oxygen a[O in the LF refining station steel]=0-15ppm, taking the following quantity of slag of pushing off the slag tapping and control is 0-50mm.
3. according to the method for the described converter process smelting steel round blank of pipeline with hydrogen sulfide corrosion resistance of claim 1, it is characterized in that omnidistance control aluminium technology in the LF refining process, once feed sufficient aluminum steel before the refining departures.
4. the method for converter process smelting steel round blank of pipeline with hydrogen sulfide corrosion resistance according to claim 1 is characterized in that after the vacuum-treat of VD refinery practice finishes, and silico-calcium filament length degree is fed in decision according to the aluminium content in the steel; After feeding the end of silico-calcium silk, the soft blow argon stirred 5-10 minute.
5. the method for converter process smelting steel round blank of pipeline with hydrogen sulfide corrosion resistance according to claim 1 is characterized in that tundish adopts MgCa matter coating in continuous casting process, and barricade is set; Control simultaneously that the casting machine secondary cooling water distributes and the secondary cooling water specific water, make being distributed as a section and accounting for 33%, two section and account for 48%, three section and account for 19%, specific water 0.85-1.05L/Kg of water.
6. as the method for converter process smelting steel round blank of pipeline with hydrogen sulfide corrosion resistance as described in claim 1 or 3, it is characterized in that the molten steel composition span of control is [C]=0.15-0.17% in the described LF refining process, [Si]=0.23-0.27%, [Mn]=1.22-1.28%, [S]=0-0.005%, [V]=0.04-0.07%.
7. as the described method of converter process smelting steel round blank of pipeline with hydrogen sulfide corrosion resistance as described in claim 1 or 5, it is characterized in that in the described round billet continuous casting technology according to the different size strand being 1.05L/Kg for Ф 150mm to two cold specific waters' controls; For Ф 160mm is 0.95L/Kg; For Ф 180mm is 0.9L/Kg; For Ф 200mm is 0.85L/Kg.
8. as the method for converter process smelting steel round blank of pipeline with hydrogen sulfide corrosion resistance as described in claim 1 or 5, it is characterized in that stablizing pulling rate according to the different size strand in the described round billet continuous casting technology is, is 2.5-3.2m/min for Ф 150mm; For Ф 160mm is 2.2-2.8m/min; For Ф 180mm is 1.8-2.3m/min; For Ф 200mm is 1.5-2.0m/min.
CN200910228719A 2009-11-25 2009-11-25 Method for smelting steel round blank of pipeline with hydrogen sulfide corrosion resistance by convertor process Pending CN101701276A (en)

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CN101928874A (en) * 2010-07-30 2010-12-29 天津钢铁集团有限公司 Method for smelting steel round billet for automobile axle shaft sleeve by using converter process
CN101956128A (en) * 2010-11-01 2011-01-26 广东省韶铸集团有限公司 Control method for improving low-temperature impact property of ZG16Mn steel casting
CN102676744A (en) * 2012-06-18 2012-09-19 北京科技大学 Technique for refined production of antiacid pipeline steel through VD-LF-VD
CN103506586A (en) * 2012-06-20 2014-01-15 鞍钢股份有限公司 Continuous casting method for improving central shrinkage cavity of small high-carbon steel square billet
CN103849711A (en) * 2014-03-19 2014-06-11 武汉钢铁(集团)公司 Production method of aluminium deoxidation 20 Cr steel
CN104313474A (en) * 2014-11-06 2015-01-28 内蒙古包钢钢联股份有限公司 Seamless steel tube for rare earth containing low-cost H2S corrosion-resistant L320NS pipeline and production method thereof
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CN101928874A (en) * 2010-07-30 2010-12-29 天津钢铁集团有限公司 Method for smelting steel round billet for automobile axle shaft sleeve by using converter process
CN101956128A (en) * 2010-11-01 2011-01-26 广东省韶铸集团有限公司 Control method for improving low-temperature impact property of ZG16Mn steel casting
CN102676744A (en) * 2012-06-18 2012-09-19 北京科技大学 Technique for refined production of antiacid pipeline steel through VD-LF-VD
CN103506586A (en) * 2012-06-20 2014-01-15 鞍钢股份有限公司 Continuous casting method for improving central shrinkage cavity of small high-carbon steel square billet
CN103506586B (en) * 2012-06-20 2016-01-20 鞍钢股份有限公司 A kind of continuous cast method improving high carbon steel billet central pipe
CN103849711A (en) * 2014-03-19 2014-06-11 武汉钢铁(集团)公司 Production method of aluminium deoxidation 20 Cr steel
CN103849711B (en) * 2014-03-19 2015-07-01 武汉钢铁(集团)公司 Production method of aluminium deoxidation 20 Cr steel
CN104313474A (en) * 2014-11-06 2015-01-28 内蒙古包钢钢联股份有限公司 Seamless steel tube for rare earth containing low-cost H2S corrosion-resistant L320NS pipeline and production method thereof
CN105200215A (en) * 2015-10-09 2015-12-30 天津钢铁集团有限公司 Production method of 50mm-100mm microalloy thick plate
CN105200215B (en) * 2015-10-09 2017-12-29 天津钢铁集团有限公司 A kind of 50 100mm microalloy Heavy plate production methods

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