CN115341134A - Production method of wire rod for high-sulfur aluminum-containing rack - Google Patents

Production method of wire rod for high-sulfur aluminum-containing rack Download PDF

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CN115341134A
CN115341134A CN202211072707.4A CN202211072707A CN115341134A CN 115341134 A CN115341134 A CN 115341134A CN 202211072707 A CN202211072707 A CN 202211072707A CN 115341134 A CN115341134 A CN 115341134A
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Prior art keywords
aluminum
wire rod
sulfur
blank
containing rack
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Chinese (zh)
Inventor
杨经伟
王杨
刘建
张东
黄俊文
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Nanjing Iron and Steel Co Ltd
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Nanjing Iron and Steel Co Ltd
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    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
    • B21B1/16—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling wire rods, bars, merchant bars, rounds wire or material of like small cross-section
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B15/00—Arrangements for performing additional metal-working operations specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
    • B21B37/74—Temperature control, e.g. by cooling or heating the rolls or the product
    • 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
    • B22D11/001—Continuous casting of metals, i.e. casting in indefinite lengths of specific alloys
    • 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
    • B22D11/12—Accessories for subsequent treating or working cast stock in situ
    • B22D11/1206—Accessories for subsequent treating or working cast stock in situ for plastic shaping of strands
    • 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
    • C21C7/0056—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00 using cored wires
    • 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
    • C21C7/0075—Treating in a ladle furnace, e.g. up-/reheating of molten steel within the ladle
    • 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
    • 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
    • C21C7/10—Handling in a vacuum
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D11/00—Process control or regulation for heat treatments
    • C21D11/005—Process control or regulation for heat treatments for cooling
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D6/00—Heat treatment of ferrous alloys
    • C21D6/004—Heat treatment of ferrous alloys containing Cr and Ni
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D6/00—Heat treatment of ferrous alloys
    • C21D6/005—Heat treatment of ferrous alloys containing Mn
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D6/00—Heat treatment of ferrous alloys
    • C21D6/008—Heat treatment of ferrous alloys containing Si
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/06—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of rods or wires
    • C21D8/065—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of rods or wires of ferrous alloys
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/46—Ferrous alloys, e.g. steel alloys containing chromium with nickel with vanadium
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/60—Ferrous alloys, e.g. steel alloys containing lead, selenium, tellurium, or antimony, or more than 0.04% by weight of sulfur
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B15/00—Arrangements for performing additional metal-working operations specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
    • B21B2015/0057—Coiling the rolled product
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D2211/00—Microstructure comprising significant phases
    • C21D2211/005—Ferrite
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D2211/00—Microstructure comprising significant phases
    • C21D2211/009—Pearlite
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00—Technologies related to metal processing
    • Y02P10/20—Recycling

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  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Manufacturing & Machinery (AREA)
  • Heat Treatment Of Steel (AREA)

Abstract

The invention discloses a production method of a wire rod for a high-sulfur aluminum-containing rack, which relates to the technical field of steel production, wherein the wire rod for the high-sulfur aluminum-containing rack is successfully produced through reasonable component design and corresponding production process, and various performance indexes such as inclusion rating, tensile strength and hardness of a product meet the requirements of downstream users.

Description

Production method of wire rod for high-sulfur aluminum-containing rack
Technical Field
The invention relates to the technical field of steel production, in particular to a method for producing a wire rod for a high-sulfur-content aluminum-containing rack.
Background
The rack-and-pinion steering mechanism has the advantages of simple structure, few components, light weight, low cost, high rotating efficiency and the like, and is widely applied to the steering gear of the passenger car. The rack is a key main part in the rack and pinion steering gear, and the steering wheel is used for operating a pinion of a steering mechanism to rotate so as to push the rack to move left and right to change the driving direction of the automobile. Therefore, the rack is required to have a certain rigidity, high wear resistance and fatigue strength.
In order to improve the machinability of steel, a certain amount of sulfur (0.010% -0.040%) is often added into steel, and fine MnS inclusions are precipitated at austenite grain boundaries to produce the steelStress concentration sources are generated, and turning and breaking are easy to realize, so that the cutting processability is improved. In addition, mnS has the effect of improving the surface finish of the parts after machining. Meanwhile, in order to refine grains, a certain amount of aluminum (0.020% -0.050%) is usually added into the steel. However, the sulfur-containing and aluminum-containing steel is easy to generate a large amount of high melting point Al in the smelting process 2 O 3 And CaS inclusions influence the purity of molten steel, a water gap is easily blocked during continuous casting, and plugs fall off into the molten steel under the continuous scouring of the molten steel to form large-particle inclusions, so that the quality of subsequent products is seriously influenced.
Disclosure of Invention
Aiming at the technical problems, the invention overcomes the defects of the prior art and provides a production method of a wire rod for a high-sulfur aluminum-containing rack, which comprises the following steps:
(1) Synthetic slag and silicomanganese alloy are adopted in the electric furnace smelting process, aluminum is used for pre-deoxidation during tapping, and the end point C of the electric furnace is controlled to be more than or equal to 0.10 percent and the end point P is controlled to be less than or equal to 0.15 percent;
(2) In the LF refining process, feeding an aluminum wire, blowing argon and stirring in the whole process, blowing nitrogen for 30min or more when the white slag is not less than 30min, feeding 50-100 m of calcium iron wire after refining and deoxidation to perform modification treatment on inclusions, and refining Al before leaving the station: 0.030 percent to 0.040 percent;
(3) In the VD vacuum process, nitrogen is blown in at the early stage and then argon is switched to be stirred, the vacuum degree is less than or equal to 1Torr, the vacuum treatment time is more than or equal to 10min, an aluminum wire is fed according to the actual situation after vacuum breaking, a sulfur wire is fed for 200-400 m, the static stirring time after wire feeding is more than or equal to 20min, and the argon flow is 10-35 NL/min.
(4) In the continuous casting process, the superheat degree is 15-35 ℃, and the drawing speed is 0.45-0.52 m/min; the later molten steel is subjected to an electromagnetic stirring soft reduction process, the frequency of electromagnetic stirring is (350-500) +/-5A multiplied by 2HZ, and the reduction of the solidification tail end is 8-20 mm;
(5) Adopting a double-roller reversible rolling mill to perform cogging on a casting blank, rolling the casting blank into a primary rolling blank with a cross section of 150mm x 150mm at a finishing rolling temperature of more than or equal to 900 ℃;
(6) The primary rolling blank is subjected to shot blasting, ultrasonic flaw detection, surface full grinding, secondary shot blasting and magnetic powder flaw detection to ensure that the surface quality is good and the blank can be fed into a furnace;
(7) Adopting a sectional heating mode, and a preheating section: preheating a blank to 500-600 ℃; heating the casting blank to 800-900 ℃ at a heating speed of 10-15 ℃/min for a first heating period; the heating second section heats the blank to above 950 ℃ at a heating speed of 3-6 ℃/min; controlling the temperature of the soaking section of the heating furnace at 950-1050 ℃, and keeping the temperature for 20-40 min; the total heating time is controlled to be more than or equal to 120min, and the high-temperature time above 950 ℃ is controlled to be 50-60 min; treating iron oxide scales on the surface of the heated casting blank by using high-pressure water, wherein the water pressure is more than or equal to 18MPa;
(8) After rough rolling, medium rolling and finish rolling, the blank enters a cooling line through curling, and the curling temperature is controlled to be 800-900 ℃;
(9) After rolling, a fan is adopted to carry out forced air cooling for 80-120 s.
The invention further defines the technical scheme that:
in the production method of the wire rod for the high-sulfur aluminum-containing rack, the section of the casting blank of the wire rod for the high-sulfur aluminum-containing rack is 320mm to 480mm.
In the production method of the wire rod for the high-sulfur and aluminum-containing rack, the diameter of the wire rod for the high-sulfur and aluminum-containing rack is 20-40 mm.
The production method of the wire rod for the high-sulfur aluminum-containing rack comprises the following steps: 0.43% -0.56%, si: 0.10-0.35%, mn: 0.60-1.20%, P is less than or equal to 0.030%, S:0.020% -0.070%, ni: 0.05-0.20%, cr: 0.10-0.45%, al:0.010% -0.040%, V:0.04 to 0.08 percent.
In the production method of the wire rod for the high-sulfur-content aluminum-containing rack, the microstructure of the wire rod for the high-sulfur-content aluminum-containing rack is pearlite + ferrite.
The production method of the wire rod for the high-sulfur aluminum-containing rack has the advantages that the tensile strength of the wire rod for the high-sulfur aluminum-containing rack is 700-900 MPa, the hardness is 15-30 HRC, the elongation is more than 15%, and the decarburization is less than 0.20mm.
The beneficial effects of the invention are:
(1) According to the invention, through reasonable component design, various performance indexes of the product meet the processing and use requirements of users, a reasonable smelting scheme is formulated to control the level of impurities and improve the castability of molten steel, and ideal structure performance is further obtained through controlled rolling and controlled cooling;
(2) According to the invention, calcium iron wires of 50-150 m are fed after refining and deoxidation to perform denaturation treatment on inclusions, LF off-station calcium treatment can possibly play a role in reducing nodulation, the castability of high-sulfur-content aluminum-containing steel is improved, and continuous casting is realized. The Al content is not lower than 0.030% after refining is finished, and the feeding of an aluminum wire after VD (vacuum degassing) is broken is reduced, so that the molten steel exposure time is shortened, and the generation of inclusions is reduced;
(3) According to the invention, the expansion of a columnar crystal area is reduced through electromagnetic stirring, and a solid substance at the front edge of the columnar crystal is crushed through soft reduction of the continuous casting tail end and is mixed with molten steel at the core part, so that the microcosmic component segregation and sulfide aggregation caused by partial crystallization of the core part are reduced;
(4) The invention adopts a heating mode of sectional heating to ensure the uniform temperature of the whole blank, thereby improving the tissue uniformity of the product and enhancing the product performance;
(5) The invention controls the curling temperature at 800-900 ℃, and after rolling, the steel is forced air-cooled for 80-120 s, thereby obtaining an ideal pearlite + ferrite structure and ideal mechanical properties.
Drawings
FIG. 1 is a cross-sectional structure view of a rolled material;
FIG. 2 is a longitudinal sectional structure view of a rolled steel product.
Detailed Description
The production method of the wire rod for the high-sulfur aluminum-containing rack provided by the embodiment comprises the following chemical components: c:0.49%, si:0.24%, mn:0.90%, P:0.008%, S:0.034%, ni:0.08%, cr:0.15%, al:0.020%, V:0.05 percent.
The method comprises the following steps:
(1) The electric furnace smelting process adopts synthetic slag and silicon-manganese alloy, aluminum is used for pre-deoxidation during tapping, and the electric furnace end point C is controlled: 0.15%, end point P:0.10 percent;
(2) In the LF refining process, feeding an aluminum wire, blowing argon and stirring in the whole process, blowing nitrogen for 30min in the white slag time of 32min, feeding 100m calcium iron wire after refining and deoxidation to perform modification treatment on inclusions, and refining Al before leaving the station: 0.034%;
(3) In the VD vacuum process, nitrogen is blown in at the early stage and then argon stirring is switched, the mixture is treated for 10min under the vacuum degree of 0.5Torr, an aluminum wire of 50m and a sulfur wire of 300m are fed after vacuum breaking, and the static stirring time is 20min after wire feeding;
(4) In the continuous casting process, the superheat degree is 31 ℃, and the drawing speed is 0.48m/min; the later molten steel is subjected to an electromagnetic stirring soft reduction process, the electromagnetic stirring speed is 500A multiplied by 2Hz, and the reduction of the solidification tail end is 18mm;
(5) Adopting a double-roller reversible rolling mill to perform cogging on a casting blank, rolling the casting blank into a primary rolling blank with a cross section of 150mm x 150mm at a finish rolling temperature of 960 ℃;
(6) The primary rolling blank is subjected to shot blasting, ultrasonic flaw detection, surface full grinding, secondary shot blasting and magnetic powder flaw detection to ensure that the surface quality is good and the blank can be fed into a furnace;
(7) Adopting a sectional heating mode, and a preheating section: heating the blank to 550 ℃; heating for a first period: heating the casting blank to 850 ℃ at a heating speed of 12 ℃/min, and heating for a second stage: gently heating the mixture to 980 ℃ at a heating speed of 4 ℃/min, and preserving heat: finally, the temperature of the soaking section is kept at 1000 ℃ for 25min; the total heating time is controlled to 130min, and the high temperature time above 950 ℃ is controlled to 55min; treating iron scale on the surface of the heated casting blank by using high-pressure water, wherein the water pressure is controlled to be 21MPa;
(8) The blank is subjected to rough rolling, medium rolling and finish rolling, then is coiled and enters a cooling line, and the coiling temperature is controlled at 880 ℃;
(9) After rolling, a fan is adopted to carry out forced air cooling for 100 s.
The diameter of the free-cutting non-quenched and tempered steel finished product rolled by the process is 30mm, the structure is ferrite and pearlite, and the microstructure of the product is shown in figures 1 and 2. The detection results of the product are shown in tables 1-3, and the overall performance meets the requirements.
Figure DEST_PATH_IMAGE001
Figure 994664DEST_PATH_IMAGE002
Figure DEST_PATH_IMAGE003
In addition to the above embodiments, the present invention may have other embodiments. All technical solutions formed by adopting equivalent substitutions or equivalent transformations fall within the protection scope of the claims of the present invention.

Claims (6)

1. A production method of a wire rod for a high-sulfur aluminum-containing rack is characterized by comprising the following steps: the method comprises the following steps:
(1) Synthetic slag and silicomanganese alloy are adopted in the electric furnace smelting process, aluminum is used for pre-deoxidation during tapping, and the end point C of the electric furnace is controlled to be more than or equal to 0.10 percent and the end point P is controlled to be less than or equal to 0.15 percent;
(2) In the LF refining process, feeding an aluminum wire, blowing argon and stirring in the whole process, blowing nitrogen for 30min or more when the white slag is not less than 30min, feeding 50-100 m of calcium iron wire after refining and deoxidation to perform modification treatment on inclusions, and refining Al before leaving the station: 0.030 percent to 0.040 percent;
(3) In the VD vacuum process, nitrogen is blown in at the early stage and then argon is switched to be stirred, the vacuum degree is less than or equal to 1Torr, the vacuum treatment time is more than or equal to 10min, an aluminum wire is fed according to the actual situation after vacuum breaking, a sulfur wire is fed for 200-400 m, the static stirring time after wire feeding is more than or equal to 20min, and the argon flow is 10-35 NL/min.
(4) In the continuous casting process, the superheat degree is 15-35 ℃, and the drawing speed is 0.45-0.52 m/min; the later molten steel is subjected to an electromagnetic stirring soft reduction process, the frequency of electromagnetic stirring is (350-500) +/-5A multiplied by 2HZ, and the reduction of the solidification tail end is 8-20 mm;
(5) Adopting a double-roller reversible rolling mill to perform cogging on a casting blank, rolling the casting blank into a primary rolling blank with a cross section of 150mm x 150mm at a finishing rolling temperature of more than or equal to 900 ℃;
(6) The primary rolling blank is subjected to shot blasting, ultrasonic flaw detection, surface full grinding, secondary shot blasting and magnetic powder flaw detection to ensure that the surface quality is good and the blank can be fed into a furnace;
(7) Adopting a sectional heating mode, and a preheating section: preheating a blank to 500-600 ℃; heating the casting blank to 800-900 ℃ at a heating speed of 10-15 ℃/min for a first heating period; the heating second section heats the blank to above 950 ℃ at a heating speed of 3-6 ℃/min; the temperature of the soaking section of the heating furnace is controlled to be 950-1050 ℃, and the heat preservation time is 20-40 min; the total heating time is controlled to be more than or equal to 120min, and the high-temperature time above 950 ℃ is controlled to be 50-60 min; treating iron oxide scales on the surface of the heated casting blank by using high-pressure water, wherein the water pressure is more than or equal to 18MPa;
(8) After rough rolling, medium rolling and finish rolling, the blank enters a cooling line through curling, and the curling temperature is controlled to be 800-900 ℃;
(9) After rolling, a fan is adopted to carry out forced air cooling for 80-120 s.
2. The method for producing a wire rod for a high sulfur-containing aluminum-containing rack according to claim 1, wherein: the section of a wire rod casting blank for the high-sulfur aluminum-containing rack is 320mm 480mm.
3. The method for producing a wire rod for a high sulfur-containing aluminum-containing rack according to claim 1, wherein: the diameter of the wire rod for the high-sulfur aluminum-containing rack is 20-40 mm.
4. The method for producing a wire rod for a high sulfur-containing aluminum-containing rack according to claim 1, wherein: the wire rod for the high-sulfur aluminum-containing rack comprises the following components: 0.43% -0.56%, si: 0.10-0.35%, mn: 0.60-1.20%, P is less than or equal to 0.030%, S:0.020% -0.070%, ni: 0.05-0.20%, cr: 0.10-0.45%, al:0.010% -0.040%, V:0.04 to 0.08 percent.
5. The method for producing a wire rod for a high sulfur-containing aluminum-containing rack according to claim 4, wherein: the microstructure of the wire rod for the high-sulfur aluminum-containing rack is pearlite and ferrite.
6. The method for producing a wire rod for a high sulfur-containing aluminum-containing rack according to claim 5, wherein: the tensile strength of the wire rod for the high-sulfur aluminum-containing rack is 700-900 MPa, the hardness is 15-30 HRC, the elongation is more than 15 percent, and the decarburization is less than 0.20mm.
CN202211072707.4A 2022-09-02 2022-09-02 Production method of wire rod for high-sulfur aluminum-containing rack Pending CN115341134A (en)

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2015120634A1 (en) * 2014-02-11 2015-08-20 江苏省沙钢钢铁研究院有限公司 High-carbon steel wire rod and preparation method therefor
CN109234508A (en) * 2018-10-10 2019-01-18 邢台钢铁有限责任公司 A kind of medium carbon steel wire rod and its production method with high intensity and high-ductility
CN114150217A (en) * 2021-11-18 2022-03-08 南京钢铁股份有限公司 High-purity non-quenched and tempered round steel and preparation method thereof

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2015120634A1 (en) * 2014-02-11 2015-08-20 江苏省沙钢钢铁研究院有限公司 High-carbon steel wire rod and preparation method therefor
CN109234508A (en) * 2018-10-10 2019-01-18 邢台钢铁有限责任公司 A kind of medium carbon steel wire rod and its production method with high intensity and high-ductility
CN114150217A (en) * 2021-11-18 2022-03-08 南京钢铁股份有限公司 High-purity non-quenched and tempered round steel and preparation method thereof

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Application publication date: 20221115