CN112792310A - Continuous casting production process for producing low-carbon low-silicon wiredrawing steel at high drawing speed - Google Patents
Continuous casting production process for producing low-carbon low-silicon wiredrawing steel at high drawing speed Download PDFInfo
- Publication number
- CN112792310A CN112792310A CN202011460784.8A CN202011460784A CN112792310A CN 112792310 A CN112792310 A CN 112792310A CN 202011460784 A CN202011460784 A CN 202011460784A CN 112792310 A CN112792310 A CN 112792310A
- Authority
- CN
- China
- Prior art keywords
- low
- steel
- continuous casting
- silicon
- carbon
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/16—Controlling or regulating processes or operations
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C37/00—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
- B21C37/04—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of bars or wire
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/04—Continuous casting of metals, i.e. casting in indefinite lengths into open-ended moulds
- B22D11/055—Cooling the moulds
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/10—Supplying or treating molten metal
- B22D11/11—Treating the molten metal
- B22D11/114—Treating the molten metal by using agitating or vibrating means
- B22D11/115—Treating the molten metal by using agitating or vibrating means by using magnetic fields
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/16—Controlling or regulating processes or operations
- B22D11/18—Controlling or regulating processes or operations for pouring
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/16—Controlling or regulating processes or operations
- B22D11/22—Controlling or regulating processes or operations for cooling cast stock or mould
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/16—Controlling or regulating processes or operations
- B22D11/22—Controlling or regulating processes or operations for cooling cast stock or mould
- B22D11/225—Controlling or regulating processes or operations for cooling cast stock or mould for secondary cooling
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
- C21C5/28—Manufacture of steel in the converter
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/0006—Adding metallic additives
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/04—Removing impurities by adding a treating agent
- C21C7/06—Deoxidising, e.g. killing
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C33/00—Making ferrous alloys
- C22C33/04—Making ferrous alloys by melting
- C22C33/06—Making ferrous alloys by melting using master alloys
Abstract
The invention discloses a continuous casting production process for producing low-carbon low-silicon wiredrawing steel at a high drawing speed, and relates to the technical field of steelmaking continuous casting. The method comprises the following steps: s1, smelting in a converter: adding scrap steel and molten iron into a converter for smelting, adding deoxidation alloy in the process for deoxidation treatment, and then stopping slag and tapping; s2, CAS argon blowing station: putting the molten steel smelted in the step S1 into a CAS argon blowing station for wire feeding soft blowing treatment, further deoxidizing, and adjusting the temperature of the molten steel on the upper table; s3, casting by a continuous casting machine: and (4) transporting the ladle in the step (S2) to a rotary table, pouring molten steel into the tundish after the rotary table rotates to the pouring position, and distributing the molten steel of the tundish into each crystallizer through a water gap. After the continuous casting process is optimized, the technical breakthrough is realized in the aspect of a low-carbon low-silicon steel billet cooling system, the accident rate is low, the steel leakage frequency is controlled to be less than or equal to 1 time per month, the quality defects of the casting blank are few, the low-power defect rating is controlled to be less than or equal to 3.0, the pulling speed is greatly improved, and the productivity is increased.
Description
Technical Field
The invention relates to the technical field of steelmaking continuous casting, in particular to a continuous casting production process for producing low-carbon low-silicon wiredrawing steel at a high drawing speed.
Background
The wire drawing steel is mainly used for manufacturing hardware, dish and bowl racks and the like, at present, steel mills for producing low-carbon and low-silicon wire rods in China have low drawing speed and low production efficiency, the low-carbon and low-silicon wire rods have high requirements on component control, and the lower the harmful elements are, the better the low elements are.
However, as the control range of the carbon content is close to the peritectic steel crack reaction sensitive region, the steel leakage accident is easy to happen as the drawing speed is higher, shrinkage holes, cracks and low-power columnar crystals are easy to appear on a continuous casting billet, the total oxygen content of molten steel is too high, a large number of impurities are contained in steel, quality defects are easy to appear after high-speed rolling, and the market demand is not met, so that the drawing speed is generally controlled below 3.m/min when low-carbon low-silicon wire rods are produced by domestic continuous casting of low-carbon low-silicon steel billets, and the average drawing speed is controlled to be 2.8m/min on the premise of not optimizing the new steel-making continuous casting process, the drawing speed is low, and the productivity is low.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a continuous casting production process for producing low-carbon low-silicon wire-drawing steel at a high drawing speed, which aims to solve the problems in the background art.
In order to achieve the purpose, the invention provides the following technical scheme: a continuous casting production process for producing low-carbon low-silicon wiredrawing steel at high drawing speed comprises the following steps:
s1, smelting in a converter: adding scrap steel and molten iron into a converter for smelting, adding deoxidized alloy for molten steel deoxidization, and then stopping slag and tapping;
s2, CAS argon blowing station: putting the molten steel smelted in the step S1 into a CAS argon blowing station for wire feeding soft blowing treatment, further deoxidizing, and adjusting the temperature of the molten steel on the upper table;
s3, casting by a continuous casting machine: the ladle in the step S2 is transported to a rotary table, molten steel is poured into a tundish after the rotary table rotates to a pouring position of a continuous casting machine, and the molten steel of the tundish is distributed into each crystallizer through a water gap;
s4, preparing a low-carbon low-silicon steel blank: stirring by using a crystallization electromagnetic stirring technology, pulling out a casting blank in a crystallizer by using a withdrawal and straightening machine and a crystallization vibration device, cooling to obtain a low-carbon low-silicon steel blank, and cutting;
s5, heating by a heating furnace: heating the low-carbon low-silicon steel blank cut in the step S4 in a closed heating furnace at the temperature of 950 ℃ and 1100 ℃ for 1-2 h;
s6, rolling the low-carbon low-silicon steel billet heated in the step S5 into a low-carbon low-silicon steel wire rod with the diameter of 6.5-12mm in a high-speed wire rod rolling mill;
s7, spinning: coiling the low-carbon low-silicon wire prepared in the step S6 into a steel coil with the inner diameter of 1080mm on a laying head;
s8, stelmor cooling and coil collecting treatment, namely cooling the steel coil which is spun in the step S7 by a stelmor line fan, controlling the tissue transformation of the steel coil, optimizing the tissue of the steel coil and achieving the coil collecting effect;
s9, P/F line transportation and inspection: transporting the low-carbon low-silicon steel blank cooled and coiled in the step S8 by using a P/F line, and carrying out inspection treatment;
and S10, bundling and warehousing, namely bundling the qualified drawn steel, and warehousing after bundling, so as to realize the continuous casting production process of the low-carbon low-silicon drawn steel.
Further optimizing the technical scheme, in the step S2, the CAS argon blowing station performs deoxidation soft blowing treatment, aluminum wires and calcium silicon wires are used for deoxidation, and the soft blowing time is more than or equal to 3 minutes.
Further optimizing the technical scheme, the smelting components in the molten steel smelted in the step S2 require that C, Mn and Si are controlled in a narrow range, and the content of P, S harmful elements is controlled to be low.
Further optimizing the technical scheme, in the step S2, the temperature of the molten steel in the CAS station is controlled to be 1570-1580 ℃, and the active oxygen in the molten steel is controlled to be 10-50 ppm.
Further optimizing the technical scheme, the steel ladle in the step S3 is hoisted on a continuous casting rotary table, and steel ladle capping is adopted for the steel receiving position and the pouring position, so that the effects of reducing the temperature drop in the molten steel process and protecting pouring are achieved.
Further optimizing the technical scheme, the steel ladle in the step S3 is hoisted on a continuous casting rotary table, and steel ladle capping is adopted for the steel receiving position and the pouring position, so that the effects of reducing the temperature drop in the molten steel process and protecting pouring are achieved.
Further optimizing the technical scheme, the steel ladle in the step S3 adopts a five-flow T-shaped tundish, the temperature of the tundish is 1535-.
Further optimizing the technical scheme, the size of the low-carbon low-silicon steel billet obtained by continuous casting in the step S4 is 155mm multiplied by 155mm, and the continuous casting process adopts the automatic stopper control technology for matching processing.
Further optimizing the technical scheme, the pouring in the step S4 adopts a stopper rod automatic control technology, the opening degree of the stopper rod is adjusted according to the pulling speed, an aluminum-carbon-zirconium invasive lower nozzle is connected with molten steel and is injected into the crystallizer, the invasion depth is controlled to be 80-100mm, and the automatic control technology is matched with the crystallizer liquid level.
Further optimizing the technical scheme, the crystallizer in the step S4 adopts an R1m arc-shaped uniform cooling copper pipe, the cooling water flow rate of the crystallizer is 12m/S, the multi-taper of the cavity design of the copper pipe is gradually increased from top to bottom, a double-foot roller is matched with a lower opening, the water quantity of the crystallizer is controlled to be 165m3And h, in the production process, controlling the taper change value range of the lower opening of the copper pipe of the crystallizer within 0.3mm, and replacing the copper pipe when the size of the copper pipe exceeds 0.3 mm.
Further optimizing the technical scheme, the electromagnetic stirring technology in the step S4 is electromagnetic stirring installed inside the crystallizer, and the current control range 280A and the frequency 3HZ are set as parameters.
Further optimizing the technical scheme, the temperature of the withdrawal and straightening machine in the step S4 is 950-.
Further optimizing the technical scheme, the shutdown maintenance time of the casting machine is utilized in the step S3, the R9m arc plate is used for precision correction, the radian change of each roll surface is not more than 2mm, and the drawing speed of the continuous casting production of the low-carbon low-silicon wiredrawing steel in the step S7 reaches 3.9 m/min.
Compared with the prior art, the invention provides a continuous casting production process for producing low-carbon low-silicon wiredrawing steel at high drawing speed, which has the following beneficial effects:
1. the invention mainly aims at the continuous casting process optimization of the continuous casting of low-carbon low-silicon steel billet, which is easy to bleed out, and the casting blank is easy to generate quality defects at high drawing speed, and provides component requirements for the molten steel hoisted and cast in a continuous casting machine, and then optimizes the measures of continuous casting protection pouring control, crystallizer cooling water quantity control, crystallizer copper pipe process modification, secondary cooling water distribution optimization, 9-meter arc continuous casting machine vibration table parameter adjustment, application of electromagnetic stirring technology, secondary cooling chamber radian adjustment and the like, thereby reducing the steel leakage production accident, improving the quality of the low-carbon low-silicon steel billet with 155mm x 155mm, and ensuring the drawing speed of the low-carbon low-silicon steel continuous casting production.
2. After the continuous casting process is optimized, the technical breakthrough is realized in the aspect of a low-carbon low-silicon steel billet cooling system, the accident rate is low, the steel leakage frequency is controlled to be less than or equal to 1 time per month, the quality defects of the casting blank are few, the low-power defect rating is controlled to be less than or equal to 3.0, the drawing speed is greatly improved, the productivity is increased, and the using effect of the continuous casting process for producing the low-carbon low-silicon drawing steel at the high drawing speed is improved.
Drawings
FIG. 1 is a schematic flow chart of a continuous casting process for producing low-carbon low-silicon wire-drawing steel at a high drawing speed according to the present invention;
FIG. 2 is a chemical composition table of a continuous casting process for producing low-carbon low-silicon wire-drawing steel at a high wire-drawing speed according to the present invention;
FIG. 3 is a control table of casting temperature and drawing speed of the continuous casting process for producing low-carbon low-silicon wire-drawing steel at high drawing speed according to the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The first embodiment is as follows: referring to fig. 1, the invention discloses a continuous casting production process for producing low-carbon low-silicon wire-drawing steel at a high drawing speed, which comprises the following steps:
s1, smelting in a converter: adding scrap steel and molten iron into a converter for smelting, adding deoxidized alloy for molten steel deoxidization, and then stopping slag and tapping;
s2, CAS argon blowing station: putting the molten steel smelted in the step S1 into a CAS argon blowing station for wire feeding soft blowing treatment, further deoxidizing, adjusting the temperature of the molten steel on the upper table, adopting covering slag with high heat transfer efficiency, controlling the ternary alkalinity of the covering slag according to 0.9-0.95, controlling smelting components in the smelted molten steel in narrow ranges, controlling the content of P, S harmful elements to be low (see figure 2), controlling the temperature of the molten steel in the CAS argon blowing station to be 1570 ℃, and controlling the activity oxygen in the molten steel to be 10 ppm;
s3, casting by a continuous casting machine: conveying the steel ladle in the step S2 to a rotary table, rotating the rotary table to a casting position of a continuous casting machine, injecting molten steel into a tundish, distributing the molten steel of the tundish into each crystallizer through a water gap, hoisting the steel ladle on the continuous casting rotary table, covering the steel ladle by using a steel ladle cover at the steel receiving position and the casting position, reducing the temperature drop in the molten steel process, and protecting the casting, wherein the shutdown maintenance time of a casting machine is utilized, the precision correction is carried out by using an R9m arc plate, the radian change of each roll surface is not more than 2mm, the steel ladle adopts a five-flow T-shaped tundish, the temperature of the tundish is 1535 ℃ and 1537 ℃ (see figure 3), the flow interval is 1250mm, a U-shaped two-hole slag blocking wall is arranged in the tundish, the steel casting adopts full ladle operation, the weight of the molten steel is 32 tons, the liquid surface depth of the tundish is 800 mm;
s4, preparing a low-carbon low-silicon steel blank: stirring by using a crystallization electromagnetic stirring technology, wherein the electromagnetic stirring technology is electromagnetic stirring arranged in a crystallizer, the current control range is set as parameters of 280A and the frequency is 3HZ, a casting blank in the crystallizer is pulled out by a withdrawal and straightening machine and a crystallization vibration device, cooling treatment is carried out to obtain a low-carbon low-silicon steel blank, the temperature of the withdrawal and straightening machine is 950 ℃, the withdrawal and straightening machine adopts a soft reduction technology after the casting blank is finished, the pressure of the pressure hot blank of the withdrawal and straightening machine is 3.0MPa, the crystallizer adopts an R1m arc type uniform cooling copper pipe, the cooling water flow rate of the crystallizer is 12m/S, the multi-taper of the cavity design of the copper pipe is gradually increased from top to bottom, a double-foot roller is matched with a lower opening3H, in the production process, the range of the taper change value of the lower opening of the copper pipe of the crystallizer is controlled within 0.3mm, the copper pipe is replaced when the size of the copper pipe exceeds 0.3mm, the size of the low-carbon low-silicon steel billet obtained by continuous casting is 155mm multiplied by 155mm, the continuous casting process adopts the automatic stopper rod control technology to cooperate with each other, and the opening of the stopper rod is adjusted according to the pulling speedStarting, connecting an aluminum-carbon-zirconium invasive water outlet with molten steel to inject the molten steel into a crystallizer, controlling the invasion depth by 80mm, matching with an automatic crystallizer liquid level control technology, performing cutting treatment, and controlling the length of a low-carbon low-silicon steel blank and cutting slag by using an infrared cut-off machine to cut to length;
s5, heating by a heating furnace: heating the low-carbon low-silicon steel blank cut in the step S4 in a closed heating furnace, wherein the heating temperature is controlled to 950 ℃, and the heat preservation time is 1 h;
s6, rolling the low-carbon low-silicon steel billet heated in the step S5 on a high-speed wire rolling mill to form a stainless steel wire with the diameter of 6.5 mm;
s7, spinning: rolling the stainless steel wire prepared in the step S6 into a steel coil with the inner diameter of 1080mm on a spinning machine, and realizing the drawing speed of the continuous casting production of the low-carbon low-silicon wire drawing steel to reach 3.9 m/min;
s8, stelmor cooling and coil collecting treatment, namely cooling the steel coil which is spun in the step S7 by a stelmor line fan, controlling the tissue transformation of the steel coil, optimizing the tissue of the steel coil and achieving the coil collecting effect;
s9, P/F line transportation and inspection: transporting the low-carbon low-silicon steel blank cooled and coiled in the step S8 by using a P/F line, and carrying out inspection treatment;
and S10, bundling and warehousing, namely bundling the qualified drawn steel, and warehousing after bundling, so as to realize the continuous casting production process of the low-carbon low-silicon drawn steel.
Example two: referring to fig. 1, the invention discloses a continuous casting production process for producing low-carbon low-silicon wire-drawing steel at a high drawing speed, which comprises the following steps:
s1, smelting in a converter: adding scrap steel and molten iron into a converter for smelting, adding deoxidized alloy for molten steel deoxidization, and then stopping slag and tapping;
s2, CAS argon blowing station: putting the molten steel smelted in the step S1 into an LF refining furnace for smelting again to obtain refined molten steel, adopting covering slag with high heat transfer efficiency, controlling the ternary alkalinity of the covering slag according to 0.9-0.95, controlling smelting components in the smelted molten steel in narrow ranges, controlling the content of P, S harmful elements to be low (see figure 2), controlling the temperature of the molten steel in a CAS argon blowing station to be 1575 ℃, and controlling the active oxygen in the molten steel to be 30 ppm;
s3, casting by a continuous casting machine: transporting the ladle filled with refined molten steel in the step S2 to a rotary table, after the rotary table rotates to the pouring position of a continuous casting machine, injecting the molten steel into a tundish, distributing the molten steel of the tundish into each crystallizer through a water gap, hoisting the ladle on the continuous casting rotary table, covering the steel receiving position and the pouring position by using a ladle cover to play roles in reducing the temperature drop in the molten steel process and protecting the pouring, performing precision correction by using an R9m arc plate during the shutdown maintenance time of the casting machine, wherein the radian change of each roll surface is not more than 2mm, adopting a five-flow T-shaped tundish, the temperature of the tundish is 1543 plus 1547 ℃ (shown in figure 3), the flow interval is 1250mm, a U-shaped two-hole slag blocking wall is arranged in the tundish, the steel is poured by adopting full ladle operation, the weight of the molten steel is 32 tons, the liquid surface depth of the tundish is 800mm, and covering, heat preservation and impurities are;
s4, preparing a low-carbon low-silicon steel blank: stirring by using a crystallization electromagnetic stirring technology, wherein the electromagnetic stirring technology is electromagnetic stirring arranged in a crystallizer, the current control range is set as parameters of 280A and the frequency is 3HZ, a casting blank in the crystallizer is pulled out by a withdrawal and straightening machine and a crystallization vibration device, cooling treatment is carried out to obtain a low-carbon low-silicon steel blank, the temperature of the withdrawal and straightening machine is 1000 ℃, the withdrawal and straightening machine adopts a soft reduction technology after the casting blank is finished, the pressure of the pressure hot blank of the withdrawal and straightening machine is 3.0MPa, the crystallizer adopts an R1m arc type uniform cooling copper pipe, the cooling water flow velocity of the crystallizer is 12m/S, the multi-taper of the cavity design of the copper pipe is gradually increased from top to bottom, a double-foot roller is matched with a lower opening3H, in the production process, the taper change value range of the lower opening of the copper pipe of the crystallizer is controlled within 0.3mm, the copper pipe is replaced when the size of the copper pipe exceeds 0.3mm, the size of the low-carbon low-silicon steel billet obtained by continuous casting is 155mm multiplied by 155mm, the continuous casting process adopts the automatic stopper rod control technology to carry out matching treatment, the opening degree of the stopper rod is adjusted according to the pulling speed, the aluminum-carbon-zirconium invasive lower water opening is used for connecting molten steel to be injected into the crystallizer, the invasion depth is controlled to be 90mm, the automatic crystallizer liquid level control technology is matched, cutting treatment is carried out, and the infrared ray fixed-length cutting of aCutting, controlling the length of the low-carbon low-silicon steel billet and cutting slag;
s5, heating by a heating furnace: heating the low-carbon low-silicon steel blank cut in the step S4 in a closed heating furnace, wherein the heating temperature is controlled at 1050 ℃, and the heat preservation time is 1-2 h;
s6, rolling the high-speed wire rods, namely, rolling the low-carbon low-silicon steel blank heated in the step S5 on a stainless steel high-speed wire rod rolling mill to form the stainless steel wire rods with the diameter of 8 mm;
s7, spinning: rolling the stainless steel wire prepared in the step S6 into a steel coil with the inner diameter of 1200mm on a spinning machine, and realizing the drawing speed of the continuous casting production of the low-carbon low-silicon wire drawing steel to reach 3.9 m/min;
s8, stelmor cooling and coil collecting treatment, namely cooling the steel coil which is spun in the step S7 by a stelmor line fan, controlling the tissue transformation of the steel coil, optimizing the tissue of the steel coil and achieving the coil collecting effect;
s9, P/F line transportation and inspection: transporting the low-carbon low-silicon steel blank cooled and coiled in the step S8 by using a P/F line, and carrying out inspection treatment;
and S10, bundling and warehousing, namely bundling the qualified drawn steel, and warehousing after bundling, so as to realize the continuous casting production process of the low-carbon low-silicon drawn steel.
Example three: referring to fig. 1, the invention discloses a continuous casting production process for producing low-carbon low-silicon wire-drawing steel at a high drawing speed, which comprises the following steps:
s1, smelting in a converter: adding scrap steel and molten iron into a converter for smelting, adding deoxidized alloy for molten steel deoxidization, and then stopping slag and tapping;
s2, CAS argon blowing station: putting the molten steel smelted in the step S1 into a CAS argon blowing station for wire feeding soft blowing treatment, further deoxidizing, adjusting the temperature of the molten steel on the upper table, adopting covering slag with high heat transfer efficiency, controlling the ternary alkalinity of the covering slag according to 0.9-0.95, controlling smelting components in the smelted molten steel in narrow ranges, controlling the content of P, S harmful elements to be low (see figure 2), controlling the temperature of the molten steel in the CAS argon blowing station to be 1580 ℃, and controlling the activity oxygen in the molten steel to be 50 ppm;
s3, casting by a continuous casting machine: transporting the ladle filled with refined molten steel in the step S2 to a rotary table, after the rotary table rotates to the pouring position of a continuous casting machine, injecting the molten steel into a tundish, distributing the molten steel of the tundish into each crystallizer through a water gap, hoisting the ladle on the continuous casting rotary table, covering the steel receiving position and the pouring position by using a ladle cover to play roles in reducing the temperature drop in the molten steel process and protecting the pouring, performing precision correction by using an R9m arc plate by using the downtime maintenance time of a casting machine, ensuring that the radian change of each roll surface is not more than 2mm, adopting a five-flow T-shaped tundish for the ladle, ensuring that the temperature of the tundish is 1551 and 1555 ℃ (shown in figure 3), ensuring the flow interval of 1250mm, arranging a U-shaped two-hole slag blocking wall in the ladle, adopting full ladle operation for pouring the steel, ensuring the weight of the molten steel to be 32 tons and the liquid surface depth of the tundish to be 800 mm;
s4, preparing a low-carbon low-silicon steel blank: stirring by using a crystallization electromagnetic stirring technology, wherein the electromagnetic stirring technology is electromagnetic stirring arranged in a crystallizer, the current control range is set as parameters of 280A and the frequency is 3HZ, a casting blank in the crystallizer is pulled out by a withdrawal and straightening machine and a crystallization vibration device, cooling treatment is carried out to obtain a low-carbon low-silicon steel blank, the temperature of the withdrawal and straightening machine is 1050 ℃, the withdrawal and straightening machine adopts a soft reduction technology after the casting blank is finished, the pressure of the pressure hot blank of the withdrawal and straightening machine is 3.0MPa, the crystallizer adopts an R1m arc type uniform cooling copper pipe, the cooling water flow velocity of the crystallizer is 12m/S, the multi-taper of the cavity design of the copper pipe is gradually increased from top to bottom, a double-foot roller is matched with a lower opening3H, in the production process, the taper change value range of the lower opening of a copper pipe of the crystallizer is controlled within 0.3mm, the copper pipe is replaced when the size of the copper pipe exceeds 0.3mm, the size of a low-carbon low-silicon steel billet obtained by continuous casting is 155mm multiplied by 155mm, the continuous casting process adopts a stopper automatic control technology to carry out matching treatment, the opening degree of the stopper is adjusted according to the pulling speed, an aluminum-carbon-zirconium invasive lower water gap is used for connecting molten steel to be injected into the crystallizer, the invasion depth is controlled to be 100mm, the automatic control technology is matched with the liquid level of the crystallizer, cutting treatment is carried out, and a flame cutter is used for infrared ray sizing cutting to control the length of the low-;
s5, heating by a heating furnace: heating the low-carbon low-silicon steel blank cut in the step S4 in a closed heating furnace, wherein the heating temperature is controlled at 1100 ℃, and the heat preservation time is 2 hours;
s6, rolling the high-speed wire rods, namely, rolling the low-carbon low-silicon steel blank heated in the step S5 on a stainless steel high-speed wire rod rolling mill to form the stainless steel wire rods with the diameter of 10 mm;
s7, spinning: rolling the stainless steel wire prepared in the step S6 into a steel coil with the inner diameter of 1150-1300 mm on a wire laying machine, and realizing the continuous casting production of the low-carbon low-silicon wiredrawing steel with the drawing speed of 3.9 m/min;
s8, stelmor cooling and coil collecting treatment, namely cooling the steel coil which is spun in the step S7 by a stelmor line fan, controlling the tissue transformation of the steel coil, optimizing the tissue of the steel coil and achieving the coil collecting effect;
s9, P/F line transportation and inspection: transporting the low-carbon low-silicon steel blank cooled and coiled in the step S8 by using a P/F line, and carrying out inspection treatment;
and S10, bundling and warehousing, namely bundling the qualified drawn steel, and warehousing after bundling, so as to realize the continuous casting production process of the low-carbon low-silicon drawn steel.
And (4) judging the standard: through comparison of the three embodiments, the best effect is the first embodiment, so that the selection of the first embodiment as the best embodiment, and the specific change of the amount also belongs to the protection scope of the technical scheme.
The invention has the beneficial effects that: the invention mainly aims at continuous casting low-carbon low-silicon steel billet easy steel leakage and casting blank easy quality defect generation at high drawing speed to carry out continuous casting process optimization, and provides component requirements for the molten steel hoisted and cast in a continuous casting machine, and then optimizes continuous casting protection pouring control measures, crystallizer cooling water quantity control, crystallizer copper pipe process modification, secondary cooling water distribution optimization, 9m arc continuous casting machine vibration table parameter adjustment, application of electromagnetic stirring technology, secondary cooling chamber radian adjustment and other measures, thereby reducing steel leakage production accidents, improving the quality of 155mm by 155mm low-carbon low-silicon steel billet, and ensuring the drawing speed of low-carbon low-silicon steel continuous casting production; after the continuous casting process is optimized, the technical breakthrough is realized in the aspect of a low-carbon low-silicon steel billet cooling system, the accident rate is low, the steel leakage frequency is controlled to be less than or equal to 1 time per month, the quality defects of the casting billet are few, the low-power defect rating control is less than or equal to 3.0, the drawing speed is greatly improved, the productivity is increased, and the using effect of the continuous casting production process for producing the low-carbon low-silicon wiredrawing steel at the high drawing speed is improved.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (12)
1. A continuous casting production process for producing low-carbon low-silicon wire-drawing steel at a high drawing speed is characterized by comprising the following steps of:
s1, smelting in a converter: adding scrap steel and molten iron into a converter for smelting, adding deoxidized alloy for molten steel deoxidization, and then stopping slag and tapping;
s2, CAS argon blowing station: putting the molten steel smelted in the step S1 into a CAS argon blowing station for wire feeding soft blowing treatment, further deoxidizing, and adjusting the temperature of the molten steel on the upper table;
s3, casting by a continuous casting machine: the ladle in the step S2 is transported to a rotary table, molten steel is poured into a tundish after the rotary table rotates to a pouring position of a continuous casting machine, and the molten steel of the tundish is distributed into each crystallizer through a water gap;
s4, preparing a low-carbon low-silicon steel blank: stirring by using a crystallization electromagnetic stirring technology, pulling out a casting blank in a crystallizer by using a withdrawal and straightening machine and a crystallization vibration device, cooling to obtain a low-carbon low-silicon steel blank, and cutting;
s5, heating by a heating furnace: heating the low-carbon low-silicon steel blank cut in the step S4 in a closed heating furnace at the temperature of 950 ℃ and 1100 ℃ for 1-2 h;
s6, rolling the low-carbon low-silicon steel blank heated in the step S5 on a high-speed wire rolling mill to form a low-carbon low-silicon wire with the diameter of 6.5-12 mm;
s7, spinning: coiling the low-carbon low-silicon wire prepared in the step S6 into a steel coil with the inner diameter of 1080mm on a laying head;
s8, stelmor cooling and coil collecting treatment, namely cooling the steel coil which is spun in the step S7 by a stelmor line fan, controlling the tissue transformation of the steel coil, optimizing the tissue of the steel coil and achieving the coil collecting effect;
s9, P/F line transportation and inspection: transporting the low-carbon low-silicon steel blank cooled and coiled in the step S8 by using a P/F line, and carrying out inspection treatment;
and S10, bundling and warehousing, namely bundling the qualified drawn steel, and warehousing after bundling, so as to realize the continuous casting production process of the low-carbon low-silicon drawn steel.
2. The continuous casting production process for producing the low-carbon low-silicon wire-drawing steel at the high drawing speed according to claim 1, wherein the CAS argon blowing station in the step S2 performs deoxidation soft blowing treatment, aluminum wires and calcium silicon wires are used for deoxidation, and the soft blowing time is not less than 3 minutes.
3. The continuous casting production process for producing the low-carbon low-silicon wire-drawing steel at the high wire-drawing speed according to claim 1, wherein smelting component requirements C, Mn and Si in the molten steel smelted in the step S2 are controlled in a narrow range, and the content of P, S harmful elements is controlled to be low.
4. The continuous casting production process for producing the low-carbon and low-silicon steel wire drawing at the high drawing speed as claimed in claim 1, wherein the temperature of the molten steel in the refining furnace in the step S2 is controlled to be 1570-1580 ℃, and the active oxygen in the molten steel is controlled to be 10-50 ppm.
5. The continuous casting production process for producing the low-carbon and low-silicon wiredrawing steel at the high drawing speed according to claim 1, wherein the steel ladle in the step S3 is hoisted on a continuous casting rotary table, and steel ladle capping is adopted for a steel receiving position and a pouring position, so that the effects of reducing the temperature drop in the molten steel process and protecting pouring are achieved.
6. The continuous casting production process for producing the low-carbon low-silicon wire-drawing steel at the high drawing speed as claimed in claim 1, wherein the steel ladle in the step S3 adopts a five-flow T-shaped tundish, the temperature of the tundish is 1535-1555 ℃, the flow spacing is 1250mm, a U-shaped two-hole slag wall is arranged in the tundish, the steel pouring adopts full ladle operation, the weight of molten steel is 32 tons, the liquid level depth of the tundish is 800mm, and tundish covering, heat preservation and inclusion adsorption are carried out by using tundish covering agents.
7. The continuous casting process of claim 1, wherein the size of the low-carbon and low-silicon steel billet obtained by continuous casting in step S4 is 155mm x 155mm, and the continuous casting process is performed by using an automatic stopper control technique.
8. The continuous casting process for producing low-carbon low-silicon steel wire at high drawing speed according to claim 1, wherein the step S4 is performed by using a stopper rod automatic control technique, the stopper rod opening degree is adjusted according to the drawing speed, an aluminum-carbon-zirconium invasive water gap is connected with molten steel to inject the molten steel into the crystallizer, the invasion depth is controlled to be 80-100mm, and the crystallizer liquid level automatic control technique is matched.
9. The continuous casting process for producing low-carbon and low-silicon steel wire drawing at high drawing speed according to claim 1, wherein the crystallizer adopts R1m arc-shaped uniform cooling copper tube in the step S4, the cooling water flow rate of the crystallizer is 12m/S, the multi-taper of the cavity design of the copper tube is gradually increased from top to bottom, the lower opening is matched with a double-foot roller, and the water amount of the crystallizer is controlled at 165m3And h, in the production process, controlling the taper change value range of the lower opening of the copper pipe of the crystallizer within 0.3mm, and replacing the copper pipe when the size of the copper pipe exceeds 0.3 mm.
10. The continuous casting production process of producing the low-carbon low-silicon wire-drawing steel at the high wire-drawing speed according to claim 1, wherein the electromagnetic stirring technology in the step S4 is electromagnetic stirring installed inside a crystallizer, and the current control range 280A and the frequency 3HZ are set as parameters.
11. The continuous casting production process for producing the low-carbon low-silicon steel wire at the high drawing speed as claimed in claim 1, wherein the temperature of the withdrawal and straightening machine in the step S4 is 950-.
12. The continuous casting production process of low-carbon low-silicon wiredrawing steel with high drawing speed according to claim 1, characterized in that the shutdown maintenance time of the casting machine is utilized in the step S3, the R9m arc plate is used for precision correction, the radian change of each roll surface is not more than 2mm, and the drawing speed of the continuous casting production of low-carbon low-silicon wiredrawing steel in the step S7 reaches 3.9 m/min.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011460784.8A CN112792310A (en) | 2020-12-11 | 2020-12-11 | Continuous casting production process for producing low-carbon low-silicon wiredrawing steel at high drawing speed |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011460784.8A CN112792310A (en) | 2020-12-11 | 2020-12-11 | Continuous casting production process for producing low-carbon low-silicon wiredrawing steel at high drawing speed |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112792310A true CN112792310A (en) | 2021-05-14 |
Family
ID=75806344
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011460784.8A Pending CN112792310A (en) | 2020-12-11 | 2020-12-11 | Continuous casting production process for producing low-carbon low-silicon wiredrawing steel at high drawing speed |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112792310A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114082912A (en) * | 2021-11-15 | 2022-02-25 | 阳春新钢铁有限责任公司 | HPB300 square billet crack control method |
| CN114523082A (en) * | 2022-03-10 | 2022-05-24 | 云南曲靖钢铁集团凤凰钢铁有限公司 | Excellent special steel continuous casting process manufacturing system capable of optimizing striking speed |
| CN114769539A (en) * | 2022-03-03 | 2022-07-22 | 河钢乐亭钢铁有限公司 | Method for controlling molten steel flow of sheet billet continuous casting crystallizer |
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1597998A (en) * | 2003-09-17 | 2005-03-23 | 首钢总公司 | Process for producing steel containing alumium low carbon low ilicon by small square blank continuous caster |
| JP2006116591A (en) * | 2004-10-25 | 2006-05-11 | Jfe Steel Kk | Method for casting steel |
| CN101343677A (en) * | 2008-09-01 | 2009-01-14 | 湖南华菱涟源钢铁有限公司 | Process for manufacturing low-silicon low-carbon deep punching/drawing steel |
| CN101705429A (en) * | 2009-11-27 | 2010-05-12 | 天津钢铁集团有限公司 | Wire rod of high-speed railroad no-slag sleeper slab steel wire and production method thereof |
| JP2011011228A (en) * | 2009-07-01 | 2011-01-20 | Nippon Steel Corp | Powder for continuous casting |
| CN103627853A (en) * | 2013-12-05 | 2014-03-12 | 广东韶钢松山股份有限公司 | Method for manufacturing low-carbon and low-silicon steel |
| CN110527917A (en) * | 2019-09-30 | 2019-12-03 | 阳春新钢铁有限责任公司 | A kind of PC rod iron 30MnSiBCa gren rod and preparation method thereof |
| CN110722119A (en) * | 2019-10-25 | 2020-01-24 | 广东韶钢松山股份有限公司 | Continuous casting production process for preparing low-carbon high-sulfur high-oxygen free-cutting steel at high drawing speed |
| CN111270126A (en) * | 2020-03-10 | 2020-06-12 | 阳春新钢铁有限责任公司 | Niobium-titanium-nitrogen and titanium-nitrogen composite microalloyed HRB400E steel bar and production method thereof |
-
2020
- 2020-12-11 CN CN202011460784.8A patent/CN112792310A/en active Pending
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1597998A (en) * | 2003-09-17 | 2005-03-23 | 首钢总公司 | Process for producing steel containing alumium low carbon low ilicon by small square blank continuous caster |
| JP2006116591A (en) * | 2004-10-25 | 2006-05-11 | Jfe Steel Kk | Method for casting steel |
| CN101343677A (en) * | 2008-09-01 | 2009-01-14 | 湖南华菱涟源钢铁有限公司 | Process for manufacturing low-silicon low-carbon deep punching/drawing steel |
| JP2011011228A (en) * | 2009-07-01 | 2011-01-20 | Nippon Steel Corp | Powder for continuous casting |
| CN101705429A (en) * | 2009-11-27 | 2010-05-12 | 天津钢铁集团有限公司 | Wire rod of high-speed railroad no-slag sleeper slab steel wire and production method thereof |
| CN103627853A (en) * | 2013-12-05 | 2014-03-12 | 广东韶钢松山股份有限公司 | Method for manufacturing low-carbon and low-silicon steel |
| CN110527917A (en) * | 2019-09-30 | 2019-12-03 | 阳春新钢铁有限责任公司 | A kind of PC rod iron 30MnSiBCa gren rod and preparation method thereof |
| CN110722119A (en) * | 2019-10-25 | 2020-01-24 | 广东韶钢松山股份有限公司 | Continuous casting production process for preparing low-carbon high-sulfur high-oxygen free-cutting steel at high drawing speed |
| CN111270126A (en) * | 2020-03-10 | 2020-06-12 | 阳春新钢铁有限责任公司 | Niobium-titanium-nitrogen and titanium-nitrogen composite microalloyed HRB400E steel bar and production method thereof |
Non-Patent Citations (1)
| Title |
|---|
| 孙立根: "《连铸设计原理》", 31 August 2017, 冶金工业出版社 * |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114082912A (en) * | 2021-11-15 | 2022-02-25 | 阳春新钢铁有限责任公司 | HPB300 square billet crack control method |
| CN114769539A (en) * | 2022-03-03 | 2022-07-22 | 河钢乐亭钢铁有限公司 | Method for controlling molten steel flow of sheet billet continuous casting crystallizer |
| CN114523082A (en) * | 2022-03-10 | 2022-05-24 | 云南曲靖钢铁集团凤凰钢铁有限公司 | Excellent special steel continuous casting process manufacturing system capable of optimizing striking speed |
| CN114523082B (en) * | 2022-03-10 | 2023-08-18 | 云南曲靖钢铁集团凤凰钢铁有限公司 | Manufacturing system for continuous casting process of high-quality special steel |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN112792310A (en) | Continuous casting production process for producing low-carbon low-silicon wiredrawing steel at high drawing speed | |
| CN104259415B (en) | A kind of continuous cast method of continuous cast round billets | |
| CN101412183B (en) | Method for producing high-carbon chromium bearing steel by double retarded cooling process | |
| CN104561730A (en) | Method for producing GCr15 bearing steel billets | |
| CN104946972B (en) | Steel disc strip for diode lead and production technology of steel disc strip | |
| CN107457379B (en) | A kind of production method of high-carbon high-alloy bearing steel large round billet | |
| CN103924030B (en) | Smelting method of ultra-low oxygen pure steel | |
| CN103103443B (en) | Bearing steel GCr15 production technology capable of preventing plugging of continuous casting water gap | |
| CN103667924B (en) | A kind of production method of 40Cr gren rod | |
| CN105234365B (en) | The casting method of Properties of Heavy Rail Steel strand | |
| CN108823492B (en) | Method for producing high-alloy high-strength peritectic steel by CSP (cast steel plate) thin plate continuous casting machine | |
| CN105441787B (en) | A kind of rope making production method of high-carbon steel gren rod | |
| CN105537549B (en) | The production method of 100 DEG C of low temperature seamless steel pipe steel continuous cast round billets | |
| CN105316558A (en) | Preparation method of boron-containing steel preventing casting blank corner cracking | |
| CN105331885A (en) | Production method of 37 Mn round billets for air cylinders | |
| CN114393185B (en) | Method for improving equiaxial crystal rate of non-oriented electrical steel casting blank at high continuous casting speed | |
| CN103014505A (en) | Process for improving solidification quality of high-carbon steel casting blank | |
| CN104107889A (en) | Horizontal-continuous-casting production process and graphite die device of large-section nodular cast iron | |
| CN105624540A (en) | Control method of equiaxial crystal ratio of 30CrMo round pipe billet and steel casting blank | |
| CN110125356A (en) | A kind of continuous small-billet casting production method of drilling tool cored steel | |
| CN113817968B (en) | Continuous casting production method for square billet of medium-carbon high-aluminum steel | |
| CN102019389A (en) | P91 steel round billet continuous casting method | |
| CN105772665B (en) | The 34CrMo pipes steel billet and its method for refining of 350 ㎜ diameters | |
| CN100519800C (en) | Method for producing low-oxygen high-carbon and high-chromium bearing steel by revolving furnace continuous casting technology | |
| CN109290537B (en) | Production method of pure iron billet serving as raw material |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20210514 |
|
| RJ01 | Rejection of invention patent application after publication |