CN101705429A - Wire rod of high-speed railroad no-slag sleeper slab steel wire and production method thereof - Google Patents
Wire rod of high-speed railroad no-slag sleeper slab steel wire and production method thereof Download PDFInfo
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Abstract
The invention belongs to the technical field of steel and iron smelting technology, and particularly provides a high wire rod of a high-speed railroad no-slag sleeper slab steel wire and a production method thereof. The traditional single sleeper does not meet the requirements of high-speed railroad, and is upgraded into a sleeper slab. Aiming at the requirements for the wire rod of the high-speed train sleeper slab wire, the invention designs a special wire rod of a high-speed railroad no-slag sleeper slab steel wire and a manufacture method thereof. The wire rod comprises the following control components in percent by weight: 0.34-0.39% of C, 1.55-1.85% of Si, 0.75-1.00 % of Mn, 0.35-0.60 % of Cr, no more than 0.025% of P, no more than 0.025%of S, no less than 0.0008% of B and the balance of Fe. The production process of the wire rod comprises the following steps of: top-bottom blowing smelting by adopting high-quality concentrate and synthesizing of slag charge and wash during tapping; LF refining which adopts calcium carbide, carborundum and the like to form white slag; continuous casting protection pouring under the conditions that the degree of superheat is controlled in the range of 20-40 DEG C and the pulling rate is 1.9-2.8m/min; steel rolling under the conditions of controlling the tapping temperature of steel billet in the range of 950-1010 DEG C, cooling by the control of a water tank and the control of large amount wind during rolling and controlling the spinning temperature in the range of 840-860 DEG C.
Description
Technical field
The invention belongs to smelting iron and steel Technology field, production and the manufacture method of a kind of high-speed railway sleeper steel wire with high wire rod particularly are provided.
Technical background
The railroad sleeper steel wire, tradition adopts steel wires such as light face, indentation.Development along with railway, particularly travelling speed is up to 350 kilometers high-speed railway, the requirement of incompatibility high ferro of originally single sleeper, upgrading becomes 2.4 meters * 0.5 meter concrete slab sleeper, corresponding sleeper steel wire is also brought up to more than 9.0 millimeters by 7.0 millimeters, tensile strength requires more than the 1420Mpa, elongation after fracture L
100〉=8%, relaxation rate 1000h requires≤2.5%, and to the higher requirement of proposition fatigue lifetime, and must do fatigue test and " hydrogen embrittlement " test etc.The former wire rod that is used as producing the sleeper steel wire is owing to the requirement of the more high reason incompatibility of intensity sleeper steel wire.
The present invention adopts and reduces the C element, increase the composition design of Si, Mn element, be beneficial to post-production plasticity, increase alloying elements cr content, remedy and fall the loss of strength that C brings, add micro-B, improve hardening capacity, improve the steel over-all properties, simultaneously, further lower S, P element, improve the purity of steel.
Summary of the invention
The present invention meets or exceeds 350 kilometers bullet train concrete slab sleepers with the demand of steel wire to wire rod for adapting to speed per hour, formerly do that the sleeper steel wire is higher with wire rod intensity, hardness is bigger for overcoming, incompatibility is done proposing the concrete slab sleeper steel wire of requirements at the higher level fatigue lifetime, designs wire rod and the manufacture method of a kind of access railroad concrete slab sleeper with steel wire.
Wire rod of high-speed railroad no-slag sleeper slab steel wire of the present invention and production method thereof realize by following means.
High-speed railway concrete slab sleeper steel wire wire rod of the present invention, control composition (weight percentage) is C=0.34-0.39%, Si=1.55-1.85%, Mn=0.75-1.00%, Cr=0.35-0.60%, P≤0.025%, S≤0.025%, B 〉=0.0008%, all the other Fe.
The manufacture method of high-speed railway concrete slab sleeper steel wire wire rod of the present invention is that blast-melted → converter smelting → LF refining → continuous casting → high-speed wire rolling becomes wire rod.Particular content comprises:
1. blast-melted employing winding-up particle magnesium technology is carried out the desulfurization pre-treatment, makes into the converter hot metal composition to reach Si]=0.30-0.85%, [P]=0-0.080%, [S]=0-0.030%;
2. converter adopts top and bottom complex blowing to smelt, and employing oxygen pressure is 22800-23200m for 0.8-0.85MPa, flow
3The low oxygen pressure of/h, big flow oxygen supply system; Take dephosphorization in preceding, mid-term, the intermediary and later stages are sulfur removal technology again, takes the pushing off the slag tapping, adds synthetic slag charge in the tapping process and carry out wash heat in ladle, [C], a[O during the tapping of final deoxygenation, and control again] amount;
3. LF refining process employing calcium carbide, silicon carbide deacidizing agent are main deoxidization technique, refining process white slag refining time 10-20 minute, and the LF refining treatment time taked omnidistance argon bottom-blowing to stir at 30-40 minute; And according to pre-blowing, bio-occlusion electricity, the stirring of 3 kinds of pattern control of soft blow argon bottom-blowing;
4. continuous casting process requires ladle to take whole process to add protective casing protection cast to tundish, tundish to crystallizer, and molten steel overheat is controlled in the 20-40 ℃ of scope, and stable pulling rate is 1.9-2.8m/min; Control casting machine secondary cooling water distributes and the secondary cooling water specific water; Tundish adopts MgCa matter coating, and barricade is set; Use the crystallizer electromagnetic agitating technology;
5. high speed wire rolling, adopt the double heat storage type process furnace, optimize heating cycle, control steel billet tapping temperature is 950 ℃-1010 ℃, between pre-finish rolling and finishing train, finishing train with subtract between the sizing, subtract and respectively have two groups of water tanks to control the rolled piece temperature between sizing and the Laying head, take big air quantity controlled chilling, laying temperature is controlled at 840-860 ℃, temperature fluctuation≤20 ℃;
Described high-speed railway concrete slab sleeper steel wire wire rod is high line wire rod, and wherein preferred component is C=0.36-0.39%, Si=1.60-1.70%, Mn=0.82-0.88%, Cr=0.42-0.48%, P≤0.025%, S≤0.015%, B 〉=0.0008%, all the other Fe.
Described high-speed railway concrete slab sleeper steel wire high speed wire bar and production method thereof in the converter operation, are strengthened the slag making dephosphorization preceding, the mid-term of smelting, and the phosphorus in the intermediary and later stages stabilizing slag is also realized molten steel desulfurizing, adds CaF in the tapping process in ladle
2, the synthetic slag charge of CaO carries out wash heat, and control quantity of slag 0-50mm down adopts sial barium final deoxygenation, controls out composition of steel [C]=0.10-0.15%, [P]=0-0.012%, makes to enter dissolved oxygen a[0 in the LF refining station steel]=0-15ppm.In the LF refining process, after finishing the temperature composition and adjusting, add ferro-boron 15-25Kg, feed the CaSi silk again the soft blow argon stirred 5-10 minute, making the molten steel out-station temperature is 1555 ℃-1575 ℃.Being distributed as of continuous caster water coolant, one section accounts for 33%, two section and accounts for 48%, three section and account for 19%, specific water 1.00-1.10L/Kg.At rolling process, optimize the process furnace heating cycle, make furnace temperature poor≤50 ℃, single steel billet head and tail temperature difference≤40 ℃, closed loop control system is adopted in the control of rolled piece temperature, the Stanermo wind-cooling linear that prolongs 20-40 rice is realized big air quantity controlled chilling.
The invention has the advantages that provides high-speed railway concrete slab sleeper steel wire high speed wire bar and production method.The optimum optimization combination of this steel grade alloy element component has guaranteed the every comprehensive mechanical property optimum of wire rod, and 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 and to make white slag technology fast, guarantees that temperature, composition adjustment are even, are beneficial to desulfurization and Control and Inclusion Removal simultaneously; The LF refining procedure is furnished with ladle whole process BOTTOM ARGON BLOWING and ladle wire feeding equipment, realizes the inclusion modification processing, reduces inclusion content of steel, improves the molten steel cleanliness factor; Continuous casting adopts crystallizer induction stirring technology, improves slab quality; The process furnace strictness is controlled heat-up time, is guaranteed that the burning steel is even; Roughing mill, finishing mill system realize the control of rolled piece temperature closed loop, owing to subtract the precision mill pass schedule, the last a few passage distortion of rolled piece are less, the refinement more of wire rod surface microstructure, and surface quality is better; Utilize the state-of-the-art in the world at present air-cooled line of root stelmor overlength that rubs (total length is 113mm, than the air-cooled line length 30m of generalized case), realize big air quantity controlled chilling, make the cooling performance of wire rod better, obtain best wire rod tissue and performance.Online application caliper in time monitors size and carries out online adjustment that dimensional precision reaches ± 0.01mm, reaches world-class levels.
The high-speed railway concrete slab sleeper steel wire high speed wire bar that adopts wire rod of the present invention and manufacture method thereof to produce, the tensile strength 700-1000Mpa of its wire rod, the face shrinking percentage is greater than 30%, and unit elongation is greater than 18%.
Embodiment
Concrete slab sleeper steel wire high speed wire bar composition of the present invention is: control composition (weight percentage) C=0.34-0.39%, Si=1.55-1.85%, Mn=0.75-1.00%, P≤0.025%, S≤0.025%, Cr=0.35-0.60%, B 〉=0.0008%.
The present invention optimizes composition (weight percentage): C=0.36-0.39%, Si=1.60-1.70%, Mn=0.82-0.88%, Cr=0.42-0.48%, P≤0.025%, S≤0.015%.
Production technique of the present invention:
Blast furnace → top and bottom combined blown converter → LF refining furnace → 150 * 150mm billet continuous casting → turn over cooling bed → process furnace → high speed wire rolling → stelmor controlled chilling → 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 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 deoxidation of sial barium, guarantees the LF refining dissolved oxygen a[0 in the steel that enters the station]=0-15ppm.Take catch carbon practice, converter tapping target call molten steel [C]=0.10-0.15%, [P]=0-0.012%.
(3) LF refining: because this steel grade is mainly as high-speed railway concrete slab sleeper steel wire, every over-all properties of steel requires very high, 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 chemical ingredients is in the LF refining process: [C]=0.36-0.39%, [Si]=1.60-1.70%, [Mn]=0.82-0.88%, [Cr]=0.42-0.48%, [P]≤0.025%, [S]≤0.015%, [B]=0.0010-0.0020%
In the refining process, adopting calcium carbide, silicon carbide deacidizing agent is main deoxidization technique; White slag refining time 10-20 minute, the LF refining treatment time was at 30-40 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.After the adjustment of temperature composition finishes, add ferro-boron 15-25Kg, total analysis is done in sampling.Feed CaSi silk (Φ 13mm) 100m at last.5-10 minute soft blow argon gas of soft blow argon stirred after hello silk finished.Guarantee molten steel out-station temperature target: 1575 ± 5 ℃ in first stove connects and waters 1555 ± 5 ℃ in stove
(4) continuous casting: 150 * 150mm billet continuous casting, for guaranteeing carrying out smoothly of slab quality and continuous casting, emphasis control the following aspects:
● 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;
● control casting machine secondary cooling water distributes 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; The specific water is 1.10L/Kg;
● molten steel overheat is controlled in 20～40 ℃ of scopes, and stable pulling rate is 2.0-2.8m/min;
● 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;
● use the crystallizer induction stirring, guarantee strand crystal structure densification, even, reduce strand column crystal rate, avoid defectives such as strand crackle, shrinkage cavity.
(5) high speed wire rolling: produce and satisfy high-speed railway concrete slab sleeper steel wire high speed wire bar, for guaranteeing to obtain the inside and outside higher wire rod of quality level, emphasis control the following aspects:
● heating process: strict control heat-up time make the abundant austenitizing of steel billet, guarantee to burn steel quality, tapping temperature: 950-1050 ℃, guarantee the steel billet homogeneous heating, bonding props up steel billet head and tail temperature difference≤40 ℃, and furnace temperature is poor≤and 50 ℃.
● rolling process: between pre-finish rolling and the finishing train, finishing train with subtract between the sizing, subtract two groups of water tanks control rolled piece temperature are respectively arranged between sizing and the Laying head, and rolled piece temperature realization closed-loop control.Owing to subtract the precision mill pass schedule, the last a few passage distortion of rolled piece are less, the refinement more of wire rod surface microstructure, and surface quality is better.
● control cooling working procedure: utilize the state-of-the-art in the world at present air-cooled line of root stelmor overlength that rubs (total length is 113mm, than the air-cooled line length 30m of generalized case), realize big air quantity controlled chilling, make the cooling performance of wire rod better.Select laying temperature: 840-860 ℃; Use the 1-6# blower fan: 50%; Insulation cover: standard-sized sheet; Suitable roller table speed.For guaranteeing the poker characteristic of wire rod, the finished product tissue and performance are guaranteed in≤20 ℃ of controlled temperature fluctuations simultaneously.
● finishing procedure: for guaranteeing wire rod poker characteristic and dimensional precision, the uneven part of distortion and water-cooled is all cut end to end.Adopted to subtract the precision mill pass, formed ellipse-circle-circle-system of circles system, utilized online caliper in time to monitor the dimensional change situation simultaneously, and in time carry out online adjustment, guaranteed that dimensional precision reaches world-class levels ± 0.01mm.
Embodiment
Blast furnace → top and bottom combined blown converter → LF refining furnace → 150 * 150mm billet continuous casting → turn over cooling bed → process furnace → high speed wire rolling → stelmor controlled chilling → check → warehouse-in.
(1) goes into stove molten iron: Si=0.45%, P≤0.07%, S≤0.028%
(2) converter smelting:
Smelt steel grade 16MnVH, top and bottom combined blown converter adopts the oxygen supply of low pressure and mass flow oxygen rifle, and it is that 0.8MPa, flow are 23000m that bottom blowing nitrogen/argon gas, 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; Tapping [C]=0.10%, [P]=0.009%; Converter tapping adopts pushing off the slag tapping, following slag thickness 50mm.In ladle, add special-purpose synthetic slag charge 400kg in the tapping process.
(3) LF refining
Composition Control: [C]=0.38%, [Si]=1.62%, [Mn]=0.82%, [S]=0.008%; [B]=0.0012% enters the station and decides oxygen a[O]=12ppm; White slag refining time 18 minutes; Feed silico-calcium silk Φ 13mm, 100m, improve fluidity molten steel and inclusion modification and handle; Soft blow operation 7 minutes; 38 minutes LF refining treatment time; Adjust continuous casting 1570 ℃ of the temperature (first stove) of arriving at a station.
(4) continuous casting working procedure: casting blank section 150 * 150mm
● continuous casting is big to wrap tundish, tundish takes whole process to add protective casing protection cast to crystallizer;
● the casting machine secondary cooling water 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;
● 25 ℃ of the superheating temperature of tundish molten steel, pulling rate 2.6m/min;
● tundish is provided with barricade;
● use the crystallizer induction stirring.
(5) high speed wire rolling: Φ 14mm wire rod
● tapping temperature: 970-1010 ℃
● roll speed: 26.25m/s
● roller table speed: 35.7-37.5-39.4-41.4-43.4-45.6-47.9-50.3-52.8-52.8-47.5-4 2.7-36.3 (m/min)
● blower fan uses: 1-16# 50%
● insulation cover: standard-sized sheet
● advance to subtract 900-920 ℃ of sizing temperature, go out final rolling temperature 960-980 ℃, laying temperature 840-860 ℃.
Claims (6)
1. high-speed railway concrete slab sleeper steel wire wire rod is characterized in that controlling composition (weight percentage) C=0.34-0.39%, Si=1.55-1.85%, Mn=0.75-1.00%, Cr=0.35-0.60%, P≤0.025%, S≤0.025%, B 〉=0.0008%, all the other Fe.
2. according to the described high-speed railway concrete slab sleeper steel wire of claim 1 wire rod, and manufacture method is that blast-melted → converter smelting → LF refining → continuous casting → high-speed wire rolling becomes wire rod; It is characterized in that:
1. blast-melted employing winding-up particle magnesium technology is carried out the desulfurization pre-treatment, makes into the converter hot metal composition to reach [Si]=0.30-0.85%, [P]=0-0.080%, [S]=0-0.030%;
2. converter adopts top and bottom complex blowing to smelt, and employing oxygen pressure is 22800-23200m for 0.8-0.85MPa, flow
3The low oxygen pressure of/h, big flow oxygen supply system; Take dephosphorization in preceding, mid-term, the intermediary and later stages are sulfur removal technology again, takes the pushing off the slag tapping, adds synthetic slag charge in the tapping process and carry out wash heat in ladle, [C], a[O during the tapping of final deoxygenation, and control again] amount;
3. LF refining process employing calcium carbide, silicon carbide deacidizing agent are main deoxidization technique, refining process white slag refining time 10-20 minute, and the LF refining treatment time taked omnidistance argon bottom-blowing to stir at 30-40 minute; And according to pre-blowing, bio-occlusion electricity, the stirring of 3 kinds of pattern control of soft blow argon bottom-blowing;
4. continuous casting process requires ladle to take whole process to add protective casing protection cast to tundish, tundish to crystallizer, and molten steel overheat is controlled in the 20-40 ℃ of scope, and stable pulling rate is 1.9-2.8m/min; Control casting machine secondary cooling water distributes and the secondary cooling water specific water; Tundish adopts MgCa matter coating, and barricade is set; Use the crystallizer electromagnetic agitating technology;
5. high speed wire rolling, adopt the double heat storage type process furnace, optimize heating cycle, control steel billet tapping temperature is 950 ℃-1010 ℃, between pre-finish rolling and finishing train, finishing train with subtract between the sizing, subtract and respectively have two groups of water tanks to control the rolled piece temperature between sizing and the Laying head, take big air quantity controlled chilling, laying temperature is controlled at 840-860 ℃, temperature fluctuation≤20 ℃;
3. according to the manufacture method of the described high-speed railway concrete slab sleeper steel wire of claim 2 high speed wire bar, it is characterized in that strengthening 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, adds CaF in the tapping process in ladle
2, the synthetic slag charge of CaO carries out wash heat, and control quantity of slag 0-50mm down adopts sial barium final deoxygenation, controls out composition of steel [C]=0.10-0.15%, [P]=0-0.012%, makes to enter dissolved oxygen a[O in the LF refining station steel]=0-15ppm;
4. according to the manufacture method of the described high-speed railway concrete slab sleeper steel wire of claim 2 high speed wire bar, it is characterized in that, in the LF refining process, after finishing the adjustment of temperature composition, add ferro-boron 15-25Kg, hello CaSi silk soft blow argon again stirred 5-10 minute, and making the molten steel out-station temperature is 1555 ℃-1575 ℃.
5. according to the manufacture method of the described high-speed railway concrete slab sleeper steel wire of claim 2 high speed wire bar, it is characterized in that being distributed as of continuous caster water coolant, one section accounts for 33%, two section and accounts for 48%, three section and account for 19%, specific water 1.00-1.10L/Kg.
6. according to the manufacture method of the described high-speed railway concrete slab sleeper steel wire of claim 2 high speed wire bar, it is characterized in that, optimize the process furnace heating cycle, make furnace temperature poor≤50 ℃, single steel billet head and tail temperature difference≤40 ℃, closed loop control system is adopted in the control of rolled piece temperature, and the Stanermo wind-cooling linear that prolongs 20-40 rice is realized big air quantity controlled chilling.
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