CN101928874A - Method for smelting steel round billet for automobile axle shaft sleeve by using converter process - Google Patents
Method for smelting steel round billet for automobile axle shaft sleeve by using converter process Download PDFInfo
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Abstract
The invention discloses a method for smelting a steel round billet for an automobile axle shaft sleeve by using a converter process, which belongs to the technical field of iron and steel smelting processes. The conventional production process of a seamless steel pipe round billet for the automobile axle shaft sleeve comprises an electric arc furnace, ladle refining and continuous casting. By studying steel using characteristics, the invention develops a process of blast furnace iron-making, converter steelmaking, LF ladle refining, VD vacuum refining and round billet continuous casting. The method comprises the following process steps of: putting blast furnace molten iron into a top-bottom combined blown converter for blowing; adopting an LF refining furnace and a VD vacuum furnace for refining after tapping; casting the molten iron into a round billet of Phi150 mm to Phi200 mm by using a round billet continuous caster; and finally, processing the round billet through a turn over cooling bed, and detecting and warehousing the round billet. The method has the advantages that: the residual elements in steel reach an average level of SigmaCu+Cr+Ni+Mo=0.051%; the gas content, in particular to the nitrogen gas content is less, the N in the steel is less than or equal to 40 ppm; a quick process rhythm and a high efficiency are realized; the purity of molten steel is improved; the harmless caused by the trace residual elements is lightened; and the performance of the steel for the automobile axle shaft sleeve is improved.
Description
Technical background
The invention belongs to smelting iron and steel Technology field, particularly produce the method for the effective steel continuous cast round billets of automobile half shaft with converter process.
Background technology
The effective weldless steel tube of automobile half shaft is carbon constructional quality steel and the structural alloy steel hot rolled seamless steel tube that manufacturing automotive axle housing tube and drive axle axle housing central siphon are used.
Automotive axle housing tube is assemblied in the automotive axle position, bears car body and vehicle-mounted all wts, surging force and driving torque, and guarantees that axletree rotates freely in axle sleeve.The production technique of this product is pulled out for dashing, multiple working procedures such as machine adds, thermal treatment, gear hobbing.
The material of the effective steel of automobile half shaft mainly contains carbon constructional quality steel and structural alloy steel, and the steel grade of the automotive axle housing tube steel that the present invention relates to is the 45Mn2 structural alloy steel.Manufacturer adopts electric arc furnace explained hereafter 45Mn2 steel mostly at present, and production technique is electric arc furnace → ladle refining → continuous casting.The present invention passes through the effective steel The Characteristic Study of automobile half shaft, utilize advanced technology and technical equipment, developed blast furnace ironmaking → top and bottom combined blown converter steelmaking → LF ladle refining furnace refining → VD vacuum deaeration refining → round billet continuous casting machine continuous casting, producing the trade mark is the technology of the effective steel continuous cast round billets of automobile half shaft of 45Mn2.
The objective of the invention is to overcome and adopt electric arc furnace smelting technology to make that residual element Cu, Cr, Ni, Mo content in the steel are higher relatively, particularly the higher deficiency of a nitrogen content in the steel provides a kind of method of producing the effective steel continuous cast round billets of automobile half shaft with converter process.
Summary of the invention
The effective weldless steel tube of 45Mn2 automobile half shaft of the present invention with the composition of steel is: control composition (weight percentage) is: C=0.42-0.49%, Si=0.17-0.37%, Mn=1.40-1.80%, P≤0.035%, S≤0.035%, Cr≤0.30%, Mo≤0.15%, Ni≤0.30%Cu≤0.30%.
The present invention optimizes composition (weight percentage): C=0.44-0.46%, Si=0.23-0.27%, Mn=1.57-1.63%, P≤0.020%, S≤0.010%.
Production technique of the present invention:
Blast furnace → top and bottom combined blown converter → LF refining furnace → VD vacuum oven → round billet continuous casting machine → turn over cooling bed → check → warehouse-in.
Concrete processing step: the blast-melted top and bottom combined blown converter that enters just refines, and LF refining furnace, the refining of VD vacuum oven are adopted in the tapping back, casts Φ 150mm-Φ 200mm circle base by the round billet continuous casting machine again, after turn over cooling bed, check, warehouse-in; Wherein:
1. go into the requirement of stove hot metal composition, go into stove hot metal composition requirement Si=0.30-0.85%, P=0-0.080%, S=0-0.030% in the top and bottom combined blown converter technology;
2. top and bottom combined blown converter employing oxygen pressure is 22800-23200m for 0.8-0.85MPa, flow
3The low oxygen pressure of/h, big flow top oxygen supply system, the gas mixing of bottom blowing nitrogen/argon is mixed, and strengthens the slag making dephosphorization preceding, the mid-term of converter smelting, and the phosphorus in the intermediary and later stages stabilizing slag is also realized molten steel desulfurizing, converter pushing off the slag tapping, control is quantity of slag 0-50mm down; Converter tapping requires molten steel [C]=0.10-0.20%, [P]=0-0.012%;
3. adopting calcium carbide, ferrosilicon powder, silicon carbide deacidizing agent in the LF refining process is main deoxidization technique, make the foaming white slag, require refining finishing slag FeO+MnO＜1.0%, white slag refining time 15～25 minutes, the LF refining treatment time was at 30～40 minutes, in the refining process, omnidistance argon bottom-blowing stirs, and controls the gas flow that argon bottom-blowing stirs according to pre-blowing, bio-occlusion electricity Argon, 3 kinds of patterns of soft blow;
4. the molten steel vacuum-treat required at vacuum tightness≤67Pa 10-15 of following hold-time minute in the VD refinery practice, adopt the soft blow argon to stir simultaneously, after vacuum-treat finishes, suitably adjust hello CaSi silk quantity according to the molten steel situation, after feeding the end of CaSi silk, proceed the soft blow operation, guarantee 5-8 minute soft blow time, molten steel departures hydrogen richness is 0-2ppm, and strict control molten steel arrives the temperature of continuous casting platform;
5. continuous casting process requires ladle to take whole process to add protective casing protection cast to tundish, tundish to crystallizer; different according to steel grade characteristics and casting blank section; rationally control casting machine secondary cooling water distributes and the secondary cooling water specific water; water be assigned as one section account for 33%, two section account for 48%, three section account for 19%, specific water 0.92-1.20L/Kg; molten steel overheat is controlled in the 15-25 ℃ of scope; stable pulling rate is 1.5-3.2m/min; tundish adopts MgCa matter coating; and barricade is set, use the crystallizer electromagnetic agitating technology.
According to above method, the molten steel composition span of control is in the described LF refining process: [C]=0.44-0.46%, [Si]=0.23-0.27%, [Mn]=1.57-1.63%, [S]=0-0.010%, [P]=0-0.020%.
According to above method, in the described round billet continuous casting technology be: for Φ 150mm circle base, adopt the cooling intensity of 1.20L/Kg,, adopt the cooling intensity of 1.15L/Kg for Φ 160mm circle base according to the different control ratio water yields of casting blank specification; For Φ 180mm circle base, adopt the cooling intensity of 1.0L/Kg; For Φ 200mm circle base, adopt the cooling intensity of 0.92L/Kg.
Stablizing pulling rate according to the different size strand in the described round billet continuous casting technology is: for Φ 150mm circle base, adopt the pulling rate of 2.5-3.2m/min; For Φ 160mm circle base, adopt the pulling rate of 2.2-2.8m/min; For Φ 180mm circle base, adopt the pulling rate of 1.8-2.3m/min; For Φ 200mm circle base, adopt the pulling rate of 1.5-2.0m/min.
Use the invention has the advantages that: compare with electric arc furnace technology, residual element Cu, the Cr in the steel, Ni, Mo content are lower, reach the mean level (ML) of ∑ Cu+Cr+Ni+Mo=0.051%; The gas particularly a nitrogen content in the steel is few, N≤40ppm in the steel; The molten steel high purity, thus the quality of the effective continuous cast round billets of automobile half shaft improved; 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, blowing is steady, and terminal point 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 whole process BOTTOM ARGON BLOWING and ladle wire feeding equipment, can the effective elimination steel in gas, guarantee that the composition adjustment is even, realize that inclusion modification handles, reduce inclusion content of steel, improve the molten steel purity; Adopt crystallizer induction stirring technology, tundish adopts MgCa matter coating, and barricade is set simultaneously, improves slab quality.
This technology rhythm is fast, and the efficient height has improved the purity of molten steel, alleviates the harm that the micro residue element brings, and has improved the performance of the effective steel of automobile half shaft.
Embodiment
The effective weldless steel tube of 45Mn2 automobile half shaft of the present invention with the composition of steel is:
Control composition (weight percentage) is: C=0.42-0.49%, Si=0.17-0.37%, Mn=1.40-1.80%, P≤0.035%, S≤0.035%, Cr≤0.30%, Mo≤0.15%, Ni≤0.30%Cu≤0.30%.
The present invention optimizes composition (weight percentage): C=0.44-0.46%, Si=0.23-0.27%, Mn=1.57-1.63%, P≤0.020%, S≤0.010%.
Production technique of the present invention:
Blast furnace → top and bottom combined blown converter → LF refining furnace → VD vacuum oven → 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: adopt top and bottom combined blown converter to realize the first refining of molten steel.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.It is that 0.8-0.85MPa, flow are 22800-23200m that top and bottom combined blown converter adopts oxygen to press
3The low oxygen pressure of/h, big flow top oxygen supply system, the gas mixing of bottom blowing nitrogen/argon is mixed, for the temper brittleness that reduces the 45Mn2 steel, the cold shortness of improving steel and toughness, should reduce the content of phosphorus in the steel, sulphur as far as possible, therefore in preceding, the medium profit of converter smelting with the lower favourable condition of liquid steel temperature, strengthen the slag making dephosphorization; 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, reduces 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; Take catch carbon practice, control molten steel [C]=0.10-0.20%, [P]=0-0.012% during converter tapping.
(3) LF refining procedure: for guaranteeing the homogeneity of the stable of thermal treatment process and processing back weldless steel tube performance, require the composition of original steel uniform and stable, fluctuation range is little between each heat; Require the effective steel of automobile half shaft to have good toughness, good over-all propertieies such as anti-fatigue performance simultaneously, therefore to the kind and the content requirement strictness of steel inclusion, LF refining procedure of the present invention 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 chemical ingredients is in the LF refining process: [C]=0.43-0.48%, [Si]=0.18-0.35%, [Mn]=1.45-1.75%, [P]≤0.025%, [S]≤0.020%.
Its preferred span of control is: [C]=0.44-0.46%, [Si]=0.23-0.27%, [Mn]=1.57-1.63%, [P]≤0.020%, [S]≤0.010%.
Adopting calcium carbide, ferrosilicon powder, silicon carbide deacidizing agent in the refining process is main deoxidization technique; Make the foaming white slag, guarantee FeO+MnO＜1.0% in the refining finishing slag; Stablize refining operation, white slag refining time 15-25 minute, the LF refining treatment time was at 30-40 minute.In the refining process, omnidistance argon bottom-blowing stirs, and according to pre-blowing, bio-occlusion electricity Argon and 3 kinds of pattern control of soft blow argon bottom-blowing gas flow, guarantees the Argon mixing effect.
(4) VD refining procedure: in order to reduce the hydrogen embrittlement tendency of steel, the present invention carries out vacuum outgas to molten steel and handles.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, and gas in the effective elimination steel reduces inclusion content of steel; After vacuum-treat finishes, suitably adjust hello CaSi silk quantity, realize that the sex change of nonmetallic inclusionsin steel also improves fluidity molten steel, guarantee carrying out smoothly of cast according to the molten steel situation; After feeding the silk end, carry out the operation of soft blow argon, guarantee 5-8 minute soft blow time, evenly the chemical ingredients and the temperature of steel promote the further removal of non-metallic inclusion; Guarantee that molten steel departures hydrogen richness is 0-2ppm; Strict control arrives the liquid steel temperature of continuous casting platform, guarantees the stable of liquid steel temperature.
(5) continuous casting working procedure: adopt the round billet continuous casting machine to produce Φ 150mm-Φ 200mm continuous cast round billets, for guaranteeing carrying out smoothly of slab quality and continuous casting, emphasis control the following aspects:
A. ladle is taked the whole process protection cast to tundish, tundish to crystallizer in the casting process, effectively prevents the secondary oxidation of molten steel, guarantees the purity of molten steel;
B. rationally control the casting machine secondary cooling water and distribute and the secondary cooling water specific water, guarantee 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; According to the different control ratio water yields of casting blank specification be:, adopt the cooling intensity of 1.20L/Kg for Φ 150mm circle base; For Φ 160mm circle base, adopt the cooling intensity of 1.15L/Kg; For Φ 180mm circle base, adopt the cooling intensity of 1.0L/Kg; For Φ 200mm circle base, adopt the cooling intensity of 0.92L/Kg.
C. molten steel overheat is controlled in the 15-25 ℃ of scope, stable pulling rate is 1.5-3.2m/min, preferable range according to the different size pulling rate is: for Φ 150mm circle base, adopt the pulling rate of 2.5-3.2m/min,, adopt the pulling rate of 2.2-2.8m/min for Φ 160mm circle base, for Φ 180mm circle base, adopt 1.8-2.3m/min,, adopt the pulling rate of 1.5-2.0m/min for Φ 200mm circle base;
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, improve the equiaxial crystal ratio of strand, avoid defectives such as strand crackle, shrinkage cavity.
Embodiment 1
The technological process of production: blast furnace → top and bottom combined blown converter → LF refining furnace → VD vacuum oven → round billet continuous casting machine → turn over cooling bed → check → warehouse-in.
(1) goes into stove molten iron: Si=0.45%, P=0.070%, S=0.028%.
(2) converter smelting:
Smelt steel grade 45Mn2, top and bottom combined blown converter adopts the oxygen supply of low pressure and mass flow oxygen rifle, bottom blowing nitrogen/argon gas, and 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, tapping [C]=0.12%, [P]=0.010%; 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 procedure
Composition Control: [C]=0.44%, [Si]=0.24%, [Mn]=1.58%, [P]=0.016%, [S]=0.005%; White slag refining time 21 minutes; 35 minutes LF refining treatment time; Refining finishing slag FeO+MnO=0.7%.
(4) VD refining procedure
Kept 10 minutes during molten steel vacuum-treat vacuum tightness 60Pa, the argon of soft blow simultaneously stirs; The departures hydrogen richness is 1.2ppm; Feed CaSi silk 150m, improve fluidity molten steel and inclusion modification and handle; After feeding the end of CaSi silk, the soft blow argon stirred 6 minutes.
(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 1.20L/Kg;
C. the superheating temperature of molten steel is 23 ℃, pulling rate 2.9m/min;
D. tundish is provided with barricade;
E. use the crystallizer induction stirring.
Embodiment 2
The technological process of production: blast furnace → top and bottom combined blown converter → LF refining furnace → VD vacuum oven → round billet continuous casting machine → turn over cooling bed → check → warehouse-in.
(1) goes into stove molten iron: Si=0.50%, P=0.075%, S=0.025%.
(2) converter smelting
Smelt steel grade 45Mn2, top and bottom combined blown converter adopts the oxygen supply of low pressure and mass flow oxygen rifle, argon bottom-blowing, and 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, tapping [C]=0.15%, [P]=0.008%; Converter tapping adopts pushing off the slag tapping, following slag thickness 35mm.In ladle, add special-purpose synthetic slag charge 450kg simultaneously in the tapping process.
(3) LF refining
Composition Control: [C]=0.45%, [Si]=0.26%, [Mn]=1.60%, [P]=0.018%, [S]=0.005%; White slag refining time 20 minutes; 35 minutes LF refining treatment time; Refining finishing slag FeO+MnO=0.5%.
(4) VD refining procedure
Kept 12 minutes during molten steel Vacuum Degassing Process vacuum tightness 65Pa, the argon gas of soft blow simultaneously stirs; The departures hydrogen richness is 1.5ppm; Feed CaSi silk 220m; After feeding the end of CaSi silk, soft blow argon operation 8 minutes.
(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 1.15L/Kg;
C. the superheating temperature of molten steel is 22 ℃, pulling rate 2.5m/min;
D. tundish is provided with barricade;
E. use the crystallizer induction stirring.
Embodiment 3
The technological process of production: blast furnace → top and bottom combined blown converter → LF refining furnace → VD vacuum oven → round billet continuous casting machine → turn over cooling bed → check → warehouse-in.
(1) goes into the stove molten iron: [Si]=0.55%, [P]=0.067%, [S]=0.026%.
(2) converter smelting
Smelt steel grade 45Mn2, top and bottom combined blown converter adopts the oxygen supply of low pressure and mass flow oxygen rifle, bottom blowing nitrogen/argon gas, and 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, tapping [C]=0.16%, [P]=0.011%; Converter tapping adopts pushing off the slag tapping, following slag thickness 35mm.In ladle, add special-purpose synthetic slag charge 300kg simultaneously in the tapping process.
(3) LF refining
Composition Control: [C]=0.45%, [Si]=0.26%, [Mn]=1.61%, [P]=0.017%, [S]=0.008%; White slag refining time 18 minutes; 32 minutes LF refining treatment time.Refining finishing slag FeO+MnO=0.4%.
(4) VD refining procedure
Kept 13 minutes during molten steel vacuum-treat vacuum tightness 62Pa, the argon of soft blow simultaneously stirs; The departures hydrogen richness is 1.2ppm; Feed CaSi silk 180m; After feeding the end of CaSi silk, the soft blow argon gas stirred 7 minutes.
(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 1.0L/Kg;
C. the superheating temperature of molten steel is 21 ℃, pulling rate 2.0m/min;
D. tundish is provided with barricade;
E. use the crystallizer induction stirring.
Embodiment 4
The technological process of production: blast furnace → top and bottom combined blown converter → LF refining furnace → VD vacuum oven → round billet continuous casting machine → turn over cooling bed → check → warehouse-in.
(1) goes into the stove molten iron: [Si]=0.60%, [P]=0.065%, [S]=0.025%.
(2) converter smelting
Smelt steel grade 45Mn2, top and bottom combined blown converter adopts the oxygen supply of low pressure and mass flow oxygen rifle, argon bottom-blowing, and 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, tapping [C]=0.17%, [P]=0.009%; Converter tapping adopts pushing off the slag tapping, following slag thickness 42mm.In ladle, add special-purpose synthetic slag charge 350kg simultaneously in the tapping process.
(3) LF refining
Composition Control: [C]=0.46%, [Si]=0.25%, [Mn]=1.57%, [P]=0.015%, [S]=0.007%; White slag refining time 23 minutes; 38 minutes LF refining treatment time.Refining finishing slag FeO+MnO=0.6%.
(4) VD refining procedure
Kept 12 minutes during molten steel vacuum-treat vacuum tightness 65Pa, the argon of soft blow simultaneously stirs; The departures hydrogen richness is 1.5ppm; Feed CaSi silk 160m; After feeding the end of CaSi silk, soft blow argon 6 minutes.
(5) continuous casting working procedure: casting blank section Φ 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 0.92L/Kg;
C. the superheating temperature of molten steel is 19 ℃, pulling rate 1.8m/min;
D. tundish is provided with barricade;
E. use the crystallizer induction stirring.
Claims (4)
1. method with the converter process smelting steel round billet for automobile axle shaft sleeve, wherein the main technique step is: blast furnace → top and bottom combined blown converter → LF refining furnace → VD vacuum oven → round billet continuous casting machine → turn over cooling bed → check → warehouse-in; It is characterized in that:
1. go into the requirement of stove hot metal composition, go into stove hot metal composition requirement Si=0.30-0.85%, P=0-0.080%, S=0-0.030% in the top and bottom combined blown converter technology;
2. top and bottom combined blown converter employing oxygen pressure is 22800-23200m for 0.8-0.85MPa, flow
3The low oxygen pressure of/h, big flow top oxygen supply system, the gas mixing of bottom blowing nitrogen/argon is mixed, and strengthens the slag making dephosphorization preceding, the mid-term of converter smelting, and the phosphorus in the intermediary and later stages stabilizing slag is also realized molten steel desulfurizing, converter pushing off the slag tapping, control is quantity of slag 0-50mm down; Converter tapping requires molten steel [C]=0.10-0.20%, [P]=0-0.012%;
3. adopting calcium carbide, ferrosilicon powder, silicon carbide deacidizing agent in the LF refining process is main deoxidization technique, make the foaming white slag, require refining finishing slag FeO+MnO＜1.0%, white slag refining time 15-25 minute, the LF refining treatment time was at 30-40 minute, in the refining process, omnidistance argon bottom-blowing stirs, and controls the gas flow that argon bottom-blowing stirs according to pre-blowing, bio-occlusion electricity Argon, 3 kinds of patterns of soft blow;
4. the molten steel vacuum-treat required at vacuum tightness≤67Pa 10-15 of following hold-time minute in the VD refinery practice, adopt the soft blow argon to stir simultaneously, after vacuum-treat finishes, suitably adjust hello CaSi silk quantity according to the molten steel situation, after feeding the end of CaSi silk, proceed the soft blow operation, guarantee 5-8 minute soft blow time, molten steel departures hydrogen richness is 0-2ppm, and strict control molten steel arrives the temperature of continuous casting platform;
5. continuous casting process requires ladle to take whole process to add protective casing protection cast to tundish, tundish to crystallizer; different according to steel grade characteristics and casting blank section; rationally control casting machine secondary cooling water distributes and the secondary cooling water specific water; secondary cooling water is assigned as one section and accounts for 33%, two section and account for 48%, three section and account for 19%; specific water 0.92-1.20L/Kg; molten steel overheat is controlled in the 15-25 ℃ of scope; stable pulling rate is 1.5-3.2m/min; tundish adopts magnesia coating; and barricade is set, use the crystallizer electromagnetic agitating technology.
2. in accordance with the method for claim 1, it is characterized in that the molten steel composition span of control is in the described LF refining process: [C]=0.44-0.46%, [Si]=0.23-0.27%, [Mn]=1.57-1.63%, [S]=0-0.010%, [P]=0-0.020%.
3. in accordance with the method for claim 1, it is characterized in that in the described round billet continuous casting technology being:, adopt the cooling intensity of 1.20L/Kg for Φ 150mm circle base according to the different control ratio water yields of steel grade characteristics with casting blank specification; For Φ 160mm circle base, adopt the cooling intensity of 1.15L/Kg; For Φ 180mm circle base, adopt the cooling intensity of 1.0L/Kg; For Φ 200mm circle base, adopt the cooling intensity of 0.92L/Kg.
4. in accordance with the method for claim 1, it is characterized in that stablizing pulling rate according to the different size strand in the described round billet continuous casting technology is:, adopt the pulling rate of 2.5-3.2m/min for Φ 150mm circle base; For Φ 160mm circle base, adopt the pulling rate of 2.2-2.8m/min; For Φ 180mm circle base, adopt the pulling rate of 1.8-2.3m/min; For Φ 200mm circle base, adopt the pulling rate of 1.5-2.0m/min.
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| CN106917033B (en) * | 2017-03-27 | 2018-05-04 | 武钢集团昆明钢铁股份有限公司 | A kind of preparation method of high-quality 40Cr alloy structures vertical bar round steel |
| CN110669903A (en) * | 2019-10-14 | 2020-01-10 | 石钢京诚装备技术有限公司 | Smelting process for improving near-surface flaw detection defects of shaft rudder system steel |
| CN113549810A (en) * | 2021-07-16 | 2021-10-26 | 山西太钢不锈钢股份有限公司 | Large-size locomotive axle steel billet and preparation method thereof |
| CN114559261A (en) * | 2022-03-14 | 2022-05-31 | 湖北理工学院 | Machining method of half-shaft sleeve |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101086203A (en) * | 2007-07-19 | 2007-12-12 | 天津钢铁有限公司 | Method for producing continuous casting round billet for petroleum bush using convertor process |
| CN101088663A (en) * | 2007-07-19 | 2007-12-19 | 天津钢铁有限公司 | Converter process of producing continuously cast circular steel billet for high pressure boiler pipe |
| CN101701276A (en) * | 2009-11-25 | 2010-05-05 | 天津钢铁集团有限公司 | Method for smelting steel round blank of pipeline with hydrogen sulfide corrosion resistance by convertor process |
| CN101701277A (en) * | 2009-11-25 | 2010-05-05 | 天津钢铁集团有限公司 | Method for smelting steel round blank of air cylinder by convertor process |
-
2010
- 2010-07-30 CN CN 201010241484 patent/CN101928874A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101086203A (en) * | 2007-07-19 | 2007-12-12 | 天津钢铁有限公司 | Method for producing continuous casting round billet for petroleum bush using convertor process |
| CN101088663A (en) * | 2007-07-19 | 2007-12-19 | 天津钢铁有限公司 | Converter process of producing continuously cast circular steel billet for high pressure boiler pipe |
| CN101701276A (en) * | 2009-11-25 | 2010-05-05 | 天津钢铁集团有限公司 | Method for smelting steel round blank of pipeline with hydrogen sulfide corrosion resistance by convertor process |
| CN101701277A (en) * | 2009-11-25 | 2010-05-05 | 天津钢铁集团有限公司 | Method for smelting steel round blank of air cylinder by convertor process |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102168163A (en) * | 2011-03-23 | 2011-08-31 | 上海梅山钢铁股份有限公司 | Heating slag melting agent for smelting low-silicon liquid iron and preparation method of the heating slag melting agent |
| CN105331885A (en) * | 2015-10-09 | 2016-02-17 | 天津钢铁集团有限公司 | Production method of 37 Mn round billets for air cylinders |
| CN106917033B (en) * | 2017-03-27 | 2018-05-04 | 武钢集团昆明钢铁股份有限公司 | A kind of preparation method of high-quality 40Cr alloy structures vertical bar round steel |
| CN107675101A (en) * | 2017-08-15 | 2018-02-09 | 石家庄钢铁有限责任公司 | A kind of corrosion-resistant railway bolt and railway spike steel and its manufacture method |
| CN107675101B (en) * | 2017-08-15 | 2019-07-12 | 石家庄钢铁有限责任公司 | A kind of corrosion-resistant railway bolt and railway spike steel and its manufacturing method |
| CN110669903A (en) * | 2019-10-14 | 2020-01-10 | 石钢京诚装备技术有限公司 | Smelting process for improving near-surface flaw detection defects of shaft rudder system steel |
| CN113549810A (en) * | 2021-07-16 | 2021-10-26 | 山西太钢不锈钢股份有限公司 | Large-size locomotive axle steel billet and preparation method thereof |
| CN114559261A (en) * | 2022-03-14 | 2022-05-31 | 湖北理工学院 | Machining method of half-shaft sleeve |
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